| 1 | /* File IO for GNU Emacs. |
| 2 | |
| 3 | Copyright (C) 1985-1988, 1993-2013 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software: you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation, either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include <config.h> |
| 21 | #include <limits.h> |
| 22 | #include <fcntl.h> |
| 23 | #include <stdio.h> |
| 24 | #include <sys/types.h> |
| 25 | #include <sys/stat.h> |
| 26 | #include <unistd.h> |
| 27 | |
| 28 | #ifdef HAVE_PWD_H |
| 29 | #include <pwd.h> |
| 30 | #endif |
| 31 | |
| 32 | #include <errno.h> |
| 33 | |
| 34 | #ifdef HAVE_LIBSELINUX |
| 35 | #include <selinux/selinux.h> |
| 36 | #include <selinux/context.h> |
| 37 | #endif |
| 38 | |
| 39 | #ifdef HAVE_POSIX_ACL |
| 40 | #include <sys/acl.h> |
| 41 | #endif |
| 42 | |
| 43 | #include <c-ctype.h> |
| 44 | |
| 45 | #include "lisp.h" |
| 46 | #include "intervals.h" |
| 47 | #include "character.h" |
| 48 | #include "buffer.h" |
| 49 | #include "coding.h" |
| 50 | #include "window.h" |
| 51 | #include "blockinput.h" |
| 52 | #include "frame.h" |
| 53 | #include "dispextern.h" |
| 54 | |
| 55 | #ifdef WINDOWSNT |
| 56 | #define NOMINMAX 1 |
| 57 | #include <windows.h> |
| 58 | #include <fcntl.h> |
| 59 | #include <sys/file.h> |
| 60 | #include "w32.h" |
| 61 | #endif /* not WINDOWSNT */ |
| 62 | |
| 63 | #ifdef MSDOS |
| 64 | #include "msdos.h" |
| 65 | #include <sys/param.h> |
| 66 | #include <fcntl.h> |
| 67 | #endif |
| 68 | |
| 69 | #ifdef DOS_NT |
| 70 | /* On Windows, drive letters must be alphabetic - on DOS, the Netware |
| 71 | redirector allows the six letters between 'Z' and 'a' as well. */ |
| 72 | #ifdef MSDOS |
| 73 | #define IS_DRIVE(x) ((x) >= 'A' && (x) <= 'z') |
| 74 | #endif |
| 75 | #ifdef WINDOWSNT |
| 76 | #define IS_DRIVE(x) c_isalpha (x) |
| 77 | #endif |
| 78 | /* Need to lower-case the drive letter, or else expanded |
| 79 | filenames will sometimes compare unequal, because |
| 80 | `expand-file-name' doesn't always down-case the drive letter. */ |
| 81 | #define DRIVE_LETTER(x) c_tolower (x) |
| 82 | #endif |
| 83 | |
| 84 | #include "systime.h" |
| 85 | #include <allocator.h> |
| 86 | #include <careadlinkat.h> |
| 87 | #include <stat-time.h> |
| 88 | |
| 89 | #ifdef HPUX |
| 90 | #include <netio.h> |
| 91 | #endif |
| 92 | |
| 93 | #include "commands.h" |
| 94 | |
| 95 | /* True during writing of auto-save files. */ |
| 96 | static bool auto_saving; |
| 97 | |
| 98 | /* Nonzero umask during creation of auto-save directories. */ |
| 99 | static mode_t auto_saving_dir_umask; |
| 100 | |
| 101 | /* Set by auto_save_1 to mode of original file so Fwrite_region will create |
| 102 | a new file with the same mode as the original. */ |
| 103 | static mode_t auto_save_mode_bits; |
| 104 | |
| 105 | /* Set by auto_save_1 if an error occurred during the last auto-save. */ |
| 106 | static bool auto_save_error_occurred; |
| 107 | |
| 108 | /* If VALID_TIMESTAMP_FILE_SYSTEM, then TIMESTAMP_FILE_SYSTEM is the device |
| 109 | number of a file system where time stamps were observed to to work. */ |
| 110 | static bool valid_timestamp_file_system; |
| 111 | static dev_t timestamp_file_system; |
| 112 | |
| 113 | /* The symbol bound to coding-system-for-read when |
| 114 | insert-file-contents is called for recovering a file. This is not |
| 115 | an actual coding system name, but just an indicator to tell |
| 116 | insert-file-contents to use `emacs-mule' with a special flag for |
| 117 | auto saving and recovering a file. */ |
| 118 | static Lisp_Object Qauto_save_coding; |
| 119 | |
| 120 | /* Property name of a file name handler, |
| 121 | which gives a list of operations it handles.. */ |
| 122 | static Lisp_Object Qoperations; |
| 123 | |
| 124 | /* Lisp functions for translating file formats. */ |
| 125 | static Lisp_Object Qformat_decode, Qformat_annotate_function; |
| 126 | |
| 127 | /* Lisp function for setting buffer-file-coding-system and the |
| 128 | multibyteness of the current buffer after inserting a file. */ |
| 129 | static Lisp_Object Qafter_insert_file_set_coding; |
| 130 | |
| 131 | static Lisp_Object Qwrite_region_annotate_functions; |
| 132 | /* Each time an annotation function changes the buffer, the new buffer |
| 133 | is added here. */ |
| 134 | static Lisp_Object Vwrite_region_annotation_buffers; |
| 135 | |
| 136 | #ifdef HAVE_FSYNC |
| 137 | #endif |
| 138 | |
| 139 | static Lisp_Object Qdelete_by_moving_to_trash; |
| 140 | |
| 141 | /* Lisp function for moving files to trash. */ |
| 142 | static Lisp_Object Qmove_file_to_trash; |
| 143 | |
| 144 | /* Lisp function for recursively copying directories. */ |
| 145 | static Lisp_Object Qcopy_directory; |
| 146 | |
| 147 | /* Lisp function for recursively deleting directories. */ |
| 148 | static Lisp_Object Qdelete_directory; |
| 149 | |
| 150 | #ifdef WINDOWSNT |
| 151 | #endif |
| 152 | |
| 153 | Lisp_Object Qfile_error; |
| 154 | static Lisp_Object Qfile_already_exists, Qfile_date_error; |
| 155 | static Lisp_Object Qexcl; |
| 156 | Lisp_Object Qfile_name_history; |
| 157 | |
| 158 | static Lisp_Object Qcar_less_than_car; |
| 159 | |
| 160 | static bool a_write (int, Lisp_Object, ptrdiff_t, ptrdiff_t, |
| 161 | Lisp_Object *, struct coding_system *); |
| 162 | static bool e_write (int, Lisp_Object, ptrdiff_t, ptrdiff_t, |
| 163 | struct coding_system *); |
| 164 | |
| 165 | \f |
| 166 | void |
| 167 | report_file_error (const char *string, Lisp_Object data) |
| 168 | { |
| 169 | Lisp_Object errstring; |
| 170 | int errorno = errno; |
| 171 | char *str; |
| 172 | |
| 173 | synchronize_system_messages_locale (); |
| 174 | str = strerror (errorno); |
| 175 | errstring = code_convert_string_norecord (build_unibyte_string (str), |
| 176 | Vlocale_coding_system, 0); |
| 177 | |
| 178 | while (1) |
| 179 | switch (errorno) |
| 180 | { |
| 181 | case EEXIST: |
| 182 | xsignal (Qfile_already_exists, Fcons (errstring, data)); |
| 183 | break; |
| 184 | default: |
| 185 | /* System error messages are capitalized. Downcase the initial |
| 186 | unless it is followed by a slash. (The slash case caters to |
| 187 | error messages that begin with "I/O" or, in German, "E/A".) */ |
| 188 | if (STRING_MULTIBYTE (errstring) |
| 189 | && ! EQ (Faref (errstring, make_number (1)), make_number ('/'))) |
| 190 | { |
| 191 | int c; |
| 192 | |
| 193 | str = SSDATA (errstring); |
| 194 | c = STRING_CHAR ((unsigned char *) str); |
| 195 | Faset (errstring, make_number (0), make_number (downcase (c))); |
| 196 | } |
| 197 | |
| 198 | xsignal (Qfile_error, |
| 199 | Fcons (build_string (string), Fcons (errstring, data))); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | Lisp_Object |
| 204 | close_file_unwind (Lisp_Object fd) |
| 205 | { |
| 206 | emacs_close (XFASTINT (fd)); |
| 207 | return Qnil; |
| 208 | } |
| 209 | |
| 210 | /* Restore point, having saved it as a marker. */ |
| 211 | |
| 212 | Lisp_Object |
| 213 | restore_point_unwind (Lisp_Object location) |
| 214 | { |
| 215 | Fgoto_char (location); |
| 216 | Fset_marker (location, Qnil, Qnil); |
| 217 | return Qnil; |
| 218 | } |
| 219 | |
| 220 | \f |
| 221 | static Lisp_Object Qexpand_file_name; |
| 222 | static Lisp_Object Qsubstitute_in_file_name; |
| 223 | static Lisp_Object Qdirectory_file_name; |
| 224 | static Lisp_Object Qfile_name_directory; |
| 225 | static Lisp_Object Qfile_name_nondirectory; |
| 226 | static Lisp_Object Qunhandled_file_name_directory; |
| 227 | static Lisp_Object Qfile_name_as_directory; |
| 228 | static Lisp_Object Qcopy_file; |
| 229 | static Lisp_Object Qmake_directory_internal; |
| 230 | static Lisp_Object Qmake_directory; |
| 231 | static Lisp_Object Qdelete_directory_internal; |
| 232 | Lisp_Object Qdelete_file; |
| 233 | static Lisp_Object Qrename_file; |
| 234 | static Lisp_Object Qadd_name_to_file; |
| 235 | static Lisp_Object Qmake_symbolic_link; |
| 236 | Lisp_Object Qfile_exists_p; |
| 237 | static Lisp_Object Qfile_executable_p; |
| 238 | static Lisp_Object Qfile_readable_p; |
| 239 | static Lisp_Object Qfile_writable_p; |
| 240 | static Lisp_Object Qfile_symlink_p; |
| 241 | static Lisp_Object Qaccess_file; |
| 242 | Lisp_Object Qfile_directory_p; |
| 243 | static Lisp_Object Qfile_regular_p; |
| 244 | static Lisp_Object Qfile_accessible_directory_p; |
| 245 | static Lisp_Object Qfile_modes; |
| 246 | static Lisp_Object Qset_file_modes; |
| 247 | static Lisp_Object Qset_file_times; |
| 248 | static Lisp_Object Qfile_selinux_context; |
| 249 | static Lisp_Object Qset_file_selinux_context; |
| 250 | static Lisp_Object Qfile_acl; |
| 251 | static Lisp_Object Qset_file_acl; |
| 252 | static Lisp_Object Qfile_newer_than_file_p; |
| 253 | Lisp_Object Qinsert_file_contents; |
| 254 | Lisp_Object Qchoose_write_coding_system; |
| 255 | Lisp_Object Qwrite_region; |
| 256 | static Lisp_Object Qverify_visited_file_modtime; |
| 257 | static Lisp_Object Qset_visited_file_modtime; |
| 258 | |
| 259 | DEFUN ("find-file-name-handler", Ffind_file_name_handler, |
| 260 | Sfind_file_name_handler, 2, 2, 0, |
| 261 | doc: /* Return FILENAME's handler function for OPERATION, if it has one. |
| 262 | Otherwise, return nil. |
| 263 | A file name is handled if one of the regular expressions in |
| 264 | `file-name-handler-alist' matches it. |
| 265 | |
| 266 | If OPERATION equals `inhibit-file-name-operation', then we ignore |
| 267 | any handlers that are members of `inhibit-file-name-handlers', |
| 268 | but we still do run any other handlers. This lets handlers |
| 269 | use the standard functions without calling themselves recursively. */) |
| 270 | (Lisp_Object filename, Lisp_Object operation) |
| 271 | { |
| 272 | /* This function must not munge the match data. */ |
| 273 | Lisp_Object chain, inhibited_handlers, result; |
| 274 | ptrdiff_t pos = -1; |
| 275 | |
| 276 | result = Qnil; |
| 277 | CHECK_STRING (filename); |
| 278 | |
| 279 | if (EQ (operation, Vinhibit_file_name_operation)) |
| 280 | inhibited_handlers = Vinhibit_file_name_handlers; |
| 281 | else |
| 282 | inhibited_handlers = Qnil; |
| 283 | |
| 284 | for (chain = Vfile_name_handler_alist; CONSP (chain); |
| 285 | chain = XCDR (chain)) |
| 286 | { |
| 287 | Lisp_Object elt; |
| 288 | elt = XCAR (chain); |
| 289 | if (CONSP (elt)) |
| 290 | { |
| 291 | Lisp_Object string = XCAR (elt); |
| 292 | ptrdiff_t match_pos; |
| 293 | Lisp_Object handler = XCDR (elt); |
| 294 | Lisp_Object operations = Qnil; |
| 295 | |
| 296 | if (SYMBOLP (handler)) |
| 297 | operations = Fget (handler, Qoperations); |
| 298 | |
| 299 | if (STRINGP (string) |
| 300 | && (match_pos = fast_string_match (string, filename)) > pos |
| 301 | && (NILP (operations) || ! NILP (Fmemq (operation, operations)))) |
| 302 | { |
| 303 | Lisp_Object tem; |
| 304 | |
| 305 | handler = XCDR (elt); |
| 306 | tem = Fmemq (handler, inhibited_handlers); |
| 307 | if (NILP (tem)) |
| 308 | { |
| 309 | result = handler; |
| 310 | pos = match_pos; |
| 311 | } |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | QUIT; |
| 316 | } |
| 317 | return result; |
| 318 | } |
| 319 | \f |
| 320 | DEFUN ("file-name-directory", Ffile_name_directory, Sfile_name_directory, |
| 321 | 1, 1, 0, |
| 322 | doc: /* Return the directory component in file name FILENAME. |
| 323 | Return nil if FILENAME does not include a directory. |
| 324 | Otherwise return a directory name. |
| 325 | Given a Unix syntax file name, returns a string ending in slash. */) |
| 326 | (Lisp_Object filename) |
| 327 | { |
| 328 | #ifndef DOS_NT |
| 329 | register const char *beg; |
| 330 | #else |
| 331 | register char *beg; |
| 332 | Lisp_Object tem_fn; |
| 333 | #endif |
| 334 | register const char *p; |
| 335 | Lisp_Object handler; |
| 336 | |
| 337 | CHECK_STRING (filename); |
| 338 | |
| 339 | /* If the file name has special constructs in it, |
| 340 | call the corresponding file handler. */ |
| 341 | handler = Ffind_file_name_handler (filename, Qfile_name_directory); |
| 342 | if (!NILP (handler)) |
| 343 | { |
| 344 | Lisp_Object handled_name = call2 (handler, Qfile_name_directory, |
| 345 | filename); |
| 346 | return STRINGP (handled_name) ? handled_name : Qnil; |
| 347 | } |
| 348 | |
| 349 | #ifdef DOS_NT |
| 350 | beg = alloca (SBYTES (filename) + 1); |
| 351 | memcpy (beg, SSDATA (filename), SBYTES (filename) + 1); |
| 352 | #else |
| 353 | beg = SSDATA (filename); |
| 354 | #endif |
| 355 | p = beg + SBYTES (filename); |
| 356 | |
| 357 | while (p != beg && !IS_DIRECTORY_SEP (p[-1]) |
| 358 | #ifdef DOS_NT |
| 359 | /* only recognize drive specifier at the beginning */ |
| 360 | && !(p[-1] == ':' |
| 361 | /* handle the "/:d:foo" and "/:foo" cases correctly */ |
| 362 | && ((p == beg + 2 && !IS_DIRECTORY_SEP (*beg)) |
| 363 | || (p == beg + 4 && IS_DIRECTORY_SEP (*beg)))) |
| 364 | #endif |
| 365 | ) p--; |
| 366 | |
| 367 | if (p == beg) |
| 368 | return Qnil; |
| 369 | #ifdef DOS_NT |
| 370 | /* Expansion of "c:" to drive and default directory. */ |
| 371 | if (p[-1] == ':') |
| 372 | { |
| 373 | /* MAXPATHLEN+1 is guaranteed to be enough space for getdefdir. */ |
| 374 | char *res = alloca (MAXPATHLEN + 1); |
| 375 | char *r = res; |
| 376 | |
| 377 | if (p == beg + 4 && IS_DIRECTORY_SEP (*beg) && beg[1] == ':') |
| 378 | { |
| 379 | memcpy (res, beg, 2); |
| 380 | beg += 2; |
| 381 | r += 2; |
| 382 | } |
| 383 | |
| 384 | if (getdefdir (c_toupper (*beg) - 'A' + 1, r)) |
| 385 | { |
| 386 | if (!IS_DIRECTORY_SEP (res[strlen (res) - 1])) |
| 387 | strcat (res, "/"); |
| 388 | beg = res; |
| 389 | p = beg + strlen (beg); |
| 390 | dostounix_filename (beg); |
| 391 | tem_fn = make_specified_string (beg, -1, p - beg, |
| 392 | STRING_MULTIBYTE (filename)); |
| 393 | } |
| 394 | else |
| 395 | tem_fn = make_specified_string (beg - 2, -1, p - beg + 2, |
| 396 | STRING_MULTIBYTE (filename)); |
| 397 | } |
| 398 | else if (STRING_MULTIBYTE (filename)) |
| 399 | { |
| 400 | tem_fn = ENCODE_FILE (make_specified_string (beg, -1, p - beg, 1)); |
| 401 | dostounix_filename (SSDATA (tem_fn)); |
| 402 | tem_fn = DECODE_FILE (tem_fn); |
| 403 | } |
| 404 | else |
| 405 | { |
| 406 | dostounix_filename (beg); |
| 407 | tem_fn = make_specified_string (beg, -1, p - beg, 0); |
| 408 | } |
| 409 | return tem_fn; |
| 410 | #else /* DOS_NT */ |
| 411 | return make_specified_string (beg, -1, p - beg, STRING_MULTIBYTE (filename)); |
| 412 | #endif /* DOS_NT */ |
| 413 | } |
| 414 | |
| 415 | DEFUN ("file-name-nondirectory", Ffile_name_nondirectory, |
| 416 | Sfile_name_nondirectory, 1, 1, 0, |
| 417 | doc: /* Return file name FILENAME sans its directory. |
| 418 | For example, in a Unix-syntax file name, |
| 419 | this is everything after the last slash, |
| 420 | or the entire name if it contains no slash. */) |
| 421 | (Lisp_Object filename) |
| 422 | { |
| 423 | register const char *beg, *p, *end; |
| 424 | Lisp_Object handler; |
| 425 | |
| 426 | CHECK_STRING (filename); |
| 427 | |
| 428 | /* If the file name has special constructs in it, |
| 429 | call the corresponding file handler. */ |
| 430 | handler = Ffind_file_name_handler (filename, Qfile_name_nondirectory); |
| 431 | if (!NILP (handler)) |
| 432 | { |
| 433 | Lisp_Object handled_name = call2 (handler, Qfile_name_nondirectory, |
| 434 | filename); |
| 435 | if (STRINGP (handled_name)) |
| 436 | return handled_name; |
| 437 | error ("Invalid handler in `file-name-handler-alist'"); |
| 438 | } |
| 439 | |
| 440 | beg = SSDATA (filename); |
| 441 | end = p = beg + SBYTES (filename); |
| 442 | |
| 443 | while (p != beg && !IS_DIRECTORY_SEP (p[-1]) |
| 444 | #ifdef DOS_NT |
| 445 | /* only recognize drive specifier at beginning */ |
| 446 | && !(p[-1] == ':' |
| 447 | /* handle the "/:d:foo" case correctly */ |
| 448 | && (p == beg + 2 || (p == beg + 4 && IS_DIRECTORY_SEP (*beg)))) |
| 449 | #endif |
| 450 | ) |
| 451 | p--; |
| 452 | |
| 453 | return make_specified_string (p, -1, end - p, STRING_MULTIBYTE (filename)); |
| 454 | } |
| 455 | |
| 456 | DEFUN ("unhandled-file-name-directory", Funhandled_file_name_directory, |
| 457 | Sunhandled_file_name_directory, 1, 1, 0, |
| 458 | doc: /* Return a directly usable directory name somehow associated with FILENAME. |
| 459 | A `directly usable' directory name is one that may be used without the |
| 460 | intervention of any file handler. |
| 461 | If FILENAME is a directly usable file itself, return |
| 462 | \(file-name-directory FILENAME). |
| 463 | If FILENAME refers to a file which is not accessible from a local process, |
| 464 | then this should return nil. |
| 465 | The `call-process' and `start-process' functions use this function to |
| 466 | get a current directory to run processes in. */) |
| 467 | (Lisp_Object filename) |
| 468 | { |
| 469 | Lisp_Object handler; |
| 470 | |
| 471 | /* If the file name has special constructs in it, |
| 472 | call the corresponding file handler. */ |
| 473 | handler = Ffind_file_name_handler (filename, Qunhandled_file_name_directory); |
| 474 | if (!NILP (handler)) |
| 475 | { |
| 476 | Lisp_Object handled_name = call2 (handler, Qunhandled_file_name_directory, |
| 477 | filename); |
| 478 | return STRINGP (handled_name) ? handled_name : Qnil; |
| 479 | } |
| 480 | |
| 481 | return Ffile_name_directory (filename); |
| 482 | } |
| 483 | |
| 484 | /* Convert from file name SRC of length SRCLEN to directory name in |
| 485 | DST. MULTIBYTE non-zero means the file name in SRC is a multibyte |
| 486 | string. On UNIX, just make sure there is a terminating /. Return |
| 487 | the length of DST in bytes. */ |
| 488 | |
| 489 | static ptrdiff_t |
| 490 | file_name_as_directory (char *dst, const char *src, ptrdiff_t srclen, |
| 491 | bool multibyte) |
| 492 | { |
| 493 | if (srclen == 0) |
| 494 | { |
| 495 | dst[0] = '.'; |
| 496 | dst[1] = '/'; |
| 497 | dst[2] = '\0'; |
| 498 | return 2; |
| 499 | } |
| 500 | |
| 501 | strcpy (dst, src); |
| 502 | |
| 503 | if (!IS_DIRECTORY_SEP (dst[srclen - 1])) |
| 504 | { |
| 505 | dst[srclen] = DIRECTORY_SEP; |
| 506 | dst[srclen + 1] = '\0'; |
| 507 | srclen++; |
| 508 | } |
| 509 | #ifdef DOS_NT |
| 510 | if (multibyte) |
| 511 | { |
| 512 | Lisp_Object tem_fn = make_specified_string (dst, -1, srclen, 1); |
| 513 | |
| 514 | tem_fn = ENCODE_FILE (tem_fn); |
| 515 | dostounix_filename (SSDATA (tem_fn)); |
| 516 | tem_fn = DECODE_FILE (tem_fn); |
| 517 | memcpy (dst, SSDATA (tem_fn), (srclen = SBYTES (tem_fn)) + 1); |
| 518 | } |
| 519 | else |
| 520 | dostounix_filename (dst); |
| 521 | #endif |
| 522 | return srclen; |
| 523 | } |
| 524 | |
| 525 | DEFUN ("file-name-as-directory", Ffile_name_as_directory, |
| 526 | Sfile_name_as_directory, 1, 1, 0, |
| 527 | doc: /* Return a string representing the file name FILE interpreted as a directory. |
| 528 | This operation exists because a directory is also a file, but its name as |
| 529 | a directory is different from its name as a file. |
| 530 | The result can be used as the value of `default-directory' |
| 531 | or passed as second argument to `expand-file-name'. |
| 532 | For a Unix-syntax file name, just appends a slash. */) |
| 533 | (Lisp_Object file) |
| 534 | { |
| 535 | char *buf; |
| 536 | ptrdiff_t length; |
| 537 | Lisp_Object handler; |
| 538 | |
| 539 | CHECK_STRING (file); |
| 540 | if (NILP (file)) |
| 541 | return Qnil; |
| 542 | |
| 543 | /* If the file name has special constructs in it, |
| 544 | call the corresponding file handler. */ |
| 545 | handler = Ffind_file_name_handler (file, Qfile_name_as_directory); |
| 546 | if (!NILP (handler)) |
| 547 | { |
| 548 | Lisp_Object handled_name = call2 (handler, Qfile_name_as_directory, |
| 549 | file); |
| 550 | if (STRINGP (handled_name)) |
| 551 | return handled_name; |
| 552 | error ("Invalid handler in `file-name-handler-alist'"); |
| 553 | } |
| 554 | |
| 555 | buf = alloca (SBYTES (file) + 10); |
| 556 | length = file_name_as_directory (buf, SSDATA (file), SBYTES (file), |
| 557 | STRING_MULTIBYTE (file)); |
| 558 | return make_specified_string (buf, -1, length, STRING_MULTIBYTE (file)); |
| 559 | } |
| 560 | \f |
| 561 | /* Convert from directory name SRC of length SRCLEN to file name in |
| 562 | DST. MULTIBYTE non-zero means the file name in SRC is a multibyte |
| 563 | string. On UNIX, just make sure there isn't a terminating /. |
| 564 | Return the length of DST in bytes. */ |
| 565 | |
| 566 | static ptrdiff_t |
| 567 | directory_file_name (char *dst, char *src, ptrdiff_t srclen, bool multibyte) |
| 568 | { |
| 569 | /* Process as Unix format: just remove any final slash. |
| 570 | But leave "/" unchanged; do not change it to "". */ |
| 571 | strcpy (dst, src); |
| 572 | if (srclen > 1 |
| 573 | && IS_DIRECTORY_SEP (dst[srclen - 1]) |
| 574 | #ifdef DOS_NT |
| 575 | && !IS_ANY_SEP (dst[srclen - 2]) |
| 576 | #endif |
| 577 | ) |
| 578 | { |
| 579 | dst[srclen - 1] = 0; |
| 580 | srclen--; |
| 581 | } |
| 582 | #ifdef DOS_NT |
| 583 | if (multibyte) |
| 584 | { |
| 585 | Lisp_Object tem_fn = make_specified_string (dst, -1, srclen, 1); |
| 586 | |
| 587 | tem_fn = ENCODE_FILE (tem_fn); |
| 588 | dostounix_filename (SSDATA (tem_fn)); |
| 589 | tem_fn = DECODE_FILE (tem_fn); |
| 590 | memcpy (dst, SSDATA (tem_fn), (srclen = SBYTES (tem_fn)) + 1); |
| 591 | } |
| 592 | else |
| 593 | dostounix_filename (dst); |
| 594 | #endif |
| 595 | return srclen; |
| 596 | } |
| 597 | |
| 598 | DEFUN ("directory-file-name", Fdirectory_file_name, Sdirectory_file_name, |
| 599 | 1, 1, 0, |
| 600 | doc: /* Returns the file name of the directory named DIRECTORY. |
| 601 | This is the name of the file that holds the data for the directory DIRECTORY. |
| 602 | This operation exists because a directory is also a file, but its name as |
| 603 | a directory is different from its name as a file. |
| 604 | In Unix-syntax, this function just removes the final slash. */) |
| 605 | (Lisp_Object directory) |
| 606 | { |
| 607 | char *buf; |
| 608 | ptrdiff_t length; |
| 609 | Lisp_Object handler; |
| 610 | |
| 611 | CHECK_STRING (directory); |
| 612 | |
| 613 | if (NILP (directory)) |
| 614 | return Qnil; |
| 615 | |
| 616 | /* If the file name has special constructs in it, |
| 617 | call the corresponding file handler. */ |
| 618 | handler = Ffind_file_name_handler (directory, Qdirectory_file_name); |
| 619 | if (!NILP (handler)) |
| 620 | { |
| 621 | Lisp_Object handled_name = call2 (handler, Qdirectory_file_name, |
| 622 | directory); |
| 623 | if (STRINGP (handled_name)) |
| 624 | return handled_name; |
| 625 | error ("Invalid handler in `file-name-handler-alist'"); |
| 626 | } |
| 627 | |
| 628 | buf = alloca (SBYTES (directory) + 20); |
| 629 | length = directory_file_name (buf, SSDATA (directory), SBYTES (directory), |
| 630 | STRING_MULTIBYTE (directory)); |
| 631 | return make_specified_string (buf, -1, length, STRING_MULTIBYTE (directory)); |
| 632 | } |
| 633 | |
| 634 | static const char make_temp_name_tbl[64] = |
| 635 | { |
| 636 | 'A','B','C','D','E','F','G','H', |
| 637 | 'I','J','K','L','M','N','O','P', |
| 638 | 'Q','R','S','T','U','V','W','X', |
| 639 | 'Y','Z','a','b','c','d','e','f', |
| 640 | 'g','h','i','j','k','l','m','n', |
| 641 | 'o','p','q','r','s','t','u','v', |
| 642 | 'w','x','y','z','0','1','2','3', |
| 643 | '4','5','6','7','8','9','-','_' |
| 644 | }; |
| 645 | |
| 646 | static unsigned make_temp_name_count, make_temp_name_count_initialized_p; |
| 647 | |
| 648 | /* Value is a temporary file name starting with PREFIX, a string. |
| 649 | |
| 650 | The Emacs process number forms part of the result, so there is |
| 651 | no danger of generating a name being used by another process. |
| 652 | In addition, this function makes an attempt to choose a name |
| 653 | which has no existing file. To make this work, PREFIX should be |
| 654 | an absolute file name. |
| 655 | |
| 656 | BASE64_P means add the pid as 3 characters in base64 |
| 657 | encoding. In this case, 6 characters will be added to PREFIX to |
| 658 | form the file name. Otherwise, if Emacs is running on a system |
| 659 | with long file names, add the pid as a decimal number. |
| 660 | |
| 661 | This function signals an error if no unique file name could be |
| 662 | generated. */ |
| 663 | |
| 664 | Lisp_Object |
| 665 | make_temp_name (Lisp_Object prefix, bool base64_p) |
| 666 | { |
| 667 | Lisp_Object val; |
| 668 | int len, clen; |
| 669 | printmax_t pid; |
| 670 | char *p, *data; |
| 671 | char pidbuf[INT_BUFSIZE_BOUND (printmax_t)]; |
| 672 | int pidlen; |
| 673 | |
| 674 | CHECK_STRING (prefix); |
| 675 | |
| 676 | /* VAL is created by adding 6 characters to PREFIX. The first |
| 677 | three are the PID of this process, in base 64, and the second |
| 678 | three are incremented if the file already exists. This ensures |
| 679 | 262144 unique file names per PID per PREFIX. */ |
| 680 | |
| 681 | pid = getpid (); |
| 682 | |
| 683 | if (base64_p) |
| 684 | { |
| 685 | pidbuf[0] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 686 | pidbuf[1] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 687 | pidbuf[2] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 688 | pidlen = 3; |
| 689 | } |
| 690 | else |
| 691 | { |
| 692 | #ifdef HAVE_LONG_FILE_NAMES |
| 693 | pidlen = sprintf (pidbuf, "%"pMd, pid); |
| 694 | #else |
| 695 | pidbuf[0] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 696 | pidbuf[1] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 697 | pidbuf[2] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 698 | pidlen = 3; |
| 699 | #endif |
| 700 | } |
| 701 | |
| 702 | len = SBYTES (prefix); clen = SCHARS (prefix); |
| 703 | val = make_uninit_multibyte_string (clen + 3 + pidlen, len + 3 + pidlen); |
| 704 | if (!STRING_MULTIBYTE (prefix)) |
| 705 | STRING_SET_UNIBYTE (val); |
| 706 | data = SSDATA (val); |
| 707 | memcpy (data, SSDATA (prefix), len); |
| 708 | p = data + len; |
| 709 | |
| 710 | memcpy (p, pidbuf, pidlen); |
| 711 | p += pidlen; |
| 712 | |
| 713 | /* Here we try to minimize useless stat'ing when this function is |
| 714 | invoked many times successively with the same PREFIX. We achieve |
| 715 | this by initializing count to a random value, and incrementing it |
| 716 | afterwards. |
| 717 | |
| 718 | We don't want make-temp-name to be called while dumping, |
| 719 | because then make_temp_name_count_initialized_p would get set |
| 720 | and then make_temp_name_count would not be set when Emacs starts. */ |
| 721 | |
| 722 | if (!make_temp_name_count_initialized_p) |
| 723 | { |
| 724 | make_temp_name_count = time (NULL); |
| 725 | make_temp_name_count_initialized_p = 1; |
| 726 | } |
| 727 | |
| 728 | while (1) |
| 729 | { |
| 730 | unsigned num = make_temp_name_count; |
| 731 | |
| 732 | p[0] = make_temp_name_tbl[num & 63], num >>= 6; |
| 733 | p[1] = make_temp_name_tbl[num & 63], num >>= 6; |
| 734 | p[2] = make_temp_name_tbl[num & 63], num >>= 6; |
| 735 | |
| 736 | /* Poor man's congruential RN generator. Replace with |
| 737 | ++make_temp_name_count for debugging. */ |
| 738 | make_temp_name_count += 25229; |
| 739 | make_temp_name_count %= 225307; |
| 740 | |
| 741 | if (!check_existing (data)) |
| 742 | { |
| 743 | /* We want to return only if errno is ENOENT. */ |
| 744 | if (errno == ENOENT) |
| 745 | return val; |
| 746 | else |
| 747 | /* The error here is dubious, but there is little else we |
| 748 | can do. The alternatives are to return nil, which is |
| 749 | as bad as (and in many cases worse than) throwing the |
| 750 | error, or to ignore the error, which will likely result |
| 751 | in looping through 225307 stat's, which is not only |
| 752 | dog-slow, but also useless since eventually nil would |
| 753 | have to be returned anyway. */ |
| 754 | report_file_error ("Cannot create temporary name for prefix", |
| 755 | Fcons (prefix, Qnil)); |
| 756 | /* not reached */ |
| 757 | } |
| 758 | } |
| 759 | } |
| 760 | |
| 761 | |
| 762 | DEFUN ("make-temp-name", Fmake_temp_name, Smake_temp_name, 1, 1, 0, |
| 763 | doc: /* Generate temporary file name (string) starting with PREFIX (a string). |
| 764 | The Emacs process number forms part of the result, |
| 765 | so there is no danger of generating a name being used by another process. |
| 766 | |
| 767 | In addition, this function makes an attempt to choose a name |
| 768 | which has no existing file. To make this work, |
| 769 | PREFIX should be an absolute file name. |
| 770 | |
| 771 | There is a race condition between calling `make-temp-name' and creating the |
| 772 | file which opens all kinds of security holes. For that reason, you should |
| 773 | probably use `make-temp-file' instead, except in three circumstances: |
| 774 | |
| 775 | * If you are creating the file in the user's home directory. |
| 776 | * If you are creating a directory rather than an ordinary file. |
| 777 | * If you are taking special precautions as `make-temp-file' does. */) |
| 778 | (Lisp_Object prefix) |
| 779 | { |
| 780 | return make_temp_name (prefix, 0); |
| 781 | } |
| 782 | |
| 783 | |
| 784 | \f |
| 785 | DEFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0, |
| 786 | doc: /* Convert filename NAME to absolute, and canonicalize it. |
| 787 | Second arg DEFAULT-DIRECTORY is directory to start with if NAME is relative |
| 788 | \(does not start with slash or tilde); if DEFAULT-DIRECTORY is nil or missing, |
| 789 | the current buffer's value of `default-directory' is used. |
| 790 | NAME should be a string that is a valid file name for the underlying |
| 791 | filesystem. |
| 792 | File name components that are `.' are removed, and |
| 793 | so are file name components followed by `..', along with the `..' itself; |
| 794 | note that these simplifications are done without checking the resulting |
| 795 | file names in the file system. |
| 796 | Multiple consecutive slashes are collapsed into a single slash, |
| 797 | except at the beginning of the file name when they are significant (e.g., |
| 798 | UNC file names on MS-Windows.) |
| 799 | An initial `~/' expands to your home directory. |
| 800 | An initial `~USER/' expands to USER's home directory. |
| 801 | See also the function `substitute-in-file-name'. |
| 802 | |
| 803 | For technical reasons, this function can return correct but |
| 804 | non-intuitive results for the root directory; for instance, |
| 805 | \(expand-file-name ".." "/") returns "/..". For this reason, use |
| 806 | \(directory-file-name (file-name-directory dirname)) to traverse a |
| 807 | filesystem tree, not (expand-file-name ".." dirname). */) |
| 808 | (Lisp_Object name, Lisp_Object default_directory) |
| 809 | { |
| 810 | /* These point to SDATA and need to be careful with string-relocation |
| 811 | during GC (via DECODE_FILE). */ |
| 812 | char *nm; |
| 813 | const char *newdir; |
| 814 | /* This should only point to alloca'd data. */ |
| 815 | char *target; |
| 816 | |
| 817 | ptrdiff_t tlen; |
| 818 | struct passwd *pw; |
| 819 | #ifdef DOS_NT |
| 820 | int drive = 0; |
| 821 | bool collapse_newdir = 1; |
| 822 | bool is_escaped = 0; |
| 823 | #endif /* DOS_NT */ |
| 824 | ptrdiff_t length; |
| 825 | Lisp_Object handler, result, handled_name; |
| 826 | bool multibyte; |
| 827 | Lisp_Object hdir; |
| 828 | |
| 829 | CHECK_STRING (name); |
| 830 | |
| 831 | /* If the file name has special constructs in it, |
| 832 | call the corresponding file handler. */ |
| 833 | handler = Ffind_file_name_handler (name, Qexpand_file_name); |
| 834 | if (!NILP (handler)) |
| 835 | { |
| 836 | handled_name = call3 (handler, Qexpand_file_name, |
| 837 | name, default_directory); |
| 838 | if (STRINGP (handled_name)) |
| 839 | return handled_name; |
| 840 | error ("Invalid handler in `file-name-handler-alist'"); |
| 841 | } |
| 842 | |
| 843 | |
| 844 | /* Use the buffer's default-directory if DEFAULT_DIRECTORY is omitted. */ |
| 845 | if (NILP (default_directory)) |
| 846 | default_directory = BVAR (current_buffer, directory); |
| 847 | if (! STRINGP (default_directory)) |
| 848 | { |
| 849 | #ifdef DOS_NT |
| 850 | /* "/" is not considered a root directory on DOS_NT, so using "/" |
| 851 | here causes an infinite recursion in, e.g., the following: |
| 852 | |
| 853 | (let (default-directory) |
| 854 | (expand-file-name "a")) |
| 855 | |
| 856 | To avoid this, we set default_directory to the root of the |
| 857 | current drive. */ |
| 858 | default_directory = build_string (emacs_root_dir ()); |
| 859 | #else |
| 860 | default_directory = build_string ("/"); |
| 861 | #endif |
| 862 | } |
| 863 | |
| 864 | if (!NILP (default_directory)) |
| 865 | { |
| 866 | handler = Ffind_file_name_handler (default_directory, Qexpand_file_name); |
| 867 | if (!NILP (handler)) |
| 868 | { |
| 869 | handled_name = call3 (handler, Qexpand_file_name, |
| 870 | name, default_directory); |
| 871 | if (STRINGP (handled_name)) |
| 872 | return handled_name; |
| 873 | error ("Invalid handler in `file-name-handler-alist'"); |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | { |
| 878 | char *o = SSDATA (default_directory); |
| 879 | |
| 880 | /* Make sure DEFAULT_DIRECTORY is properly expanded. |
| 881 | It would be better to do this down below where we actually use |
| 882 | default_directory. Unfortunately, calling Fexpand_file_name recursively |
| 883 | could invoke GC, and the strings might be relocated. This would |
| 884 | be annoying because we have pointers into strings lying around |
| 885 | that would need adjusting, and people would add new pointers to |
| 886 | the code and forget to adjust them, resulting in intermittent bugs. |
| 887 | Putting this call here avoids all that crud. |
| 888 | |
| 889 | The EQ test avoids infinite recursion. */ |
| 890 | if (! NILP (default_directory) && !EQ (default_directory, name) |
| 891 | /* Save time in some common cases - as long as default_directory |
| 892 | is not relative, it can be canonicalized with name below (if it |
| 893 | is needed at all) without requiring it to be expanded now. */ |
| 894 | #ifdef DOS_NT |
| 895 | /* Detect MSDOS file names with drive specifiers. */ |
| 896 | && ! (IS_DRIVE (o[0]) && IS_DEVICE_SEP (o[1]) |
| 897 | && IS_DIRECTORY_SEP (o[2])) |
| 898 | #ifdef WINDOWSNT |
| 899 | /* Detect Windows file names in UNC format. */ |
| 900 | && ! (IS_DIRECTORY_SEP (o[0]) && IS_DIRECTORY_SEP (o[1])) |
| 901 | #endif |
| 902 | #else /* not DOS_NT */ |
| 903 | /* Detect Unix absolute file names (/... alone is not absolute on |
| 904 | DOS or Windows). */ |
| 905 | && ! (IS_DIRECTORY_SEP (o[0])) |
| 906 | #endif /* not DOS_NT */ |
| 907 | ) |
| 908 | { |
| 909 | struct gcpro gcpro1; |
| 910 | |
| 911 | GCPRO1 (name); |
| 912 | default_directory = Fexpand_file_name (default_directory, Qnil); |
| 913 | UNGCPRO; |
| 914 | } |
| 915 | } |
| 916 | multibyte = STRING_MULTIBYTE (name); |
| 917 | if (multibyte != STRING_MULTIBYTE (default_directory)) |
| 918 | { |
| 919 | if (multibyte) |
| 920 | default_directory = string_to_multibyte (default_directory); |
| 921 | else |
| 922 | { |
| 923 | name = string_to_multibyte (name); |
| 924 | multibyte = 1; |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | /* Make a local copy of nm[] to protect it from GC in DECODE_FILE below. */ |
| 929 | nm = alloca (SBYTES (name) + 1); |
| 930 | memcpy (nm, SSDATA (name), SBYTES (name) + 1); |
| 931 | |
| 932 | #ifdef DOS_NT |
| 933 | /* Note if special escape prefix is present, but remove for now. */ |
| 934 | if (nm[0] == '/' && nm[1] == ':') |
| 935 | { |
| 936 | is_escaped = 1; |
| 937 | nm += 2; |
| 938 | } |
| 939 | |
| 940 | /* Find and remove drive specifier if present; this makes nm absolute |
| 941 | even if the rest of the name appears to be relative. Only look for |
| 942 | drive specifier at the beginning. */ |
| 943 | if (IS_DRIVE (nm[0]) && IS_DEVICE_SEP (nm[1])) |
| 944 | { |
| 945 | drive = (unsigned char) nm[0]; |
| 946 | nm += 2; |
| 947 | } |
| 948 | |
| 949 | #ifdef WINDOWSNT |
| 950 | /* If we see "c://somedir", we want to strip the first slash after the |
| 951 | colon when stripping the drive letter. Otherwise, this expands to |
| 952 | "//somedir". */ |
| 953 | if (drive && IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1])) |
| 954 | nm++; |
| 955 | |
| 956 | /* Discard any previous drive specifier if nm is now in UNC format. */ |
| 957 | if (IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1])) |
| 958 | { |
| 959 | drive = 0; |
| 960 | } |
| 961 | #endif /* WINDOWSNT */ |
| 962 | #endif /* DOS_NT */ |
| 963 | |
| 964 | /* If nm is absolute, look for `/./' or `/../' or `//''sequences; if |
| 965 | none are found, we can probably return right away. We will avoid |
| 966 | allocating a new string if name is already fully expanded. */ |
| 967 | if ( |
| 968 | IS_DIRECTORY_SEP (nm[0]) |
| 969 | #ifdef MSDOS |
| 970 | && drive && !is_escaped |
| 971 | #endif |
| 972 | #ifdef WINDOWSNT |
| 973 | && (drive || IS_DIRECTORY_SEP (nm[1])) && !is_escaped |
| 974 | #endif |
| 975 | ) |
| 976 | { |
| 977 | /* If it turns out that the filename we want to return is just a |
| 978 | suffix of FILENAME, we don't need to go through and edit |
| 979 | things; we just need to construct a new string using data |
| 980 | starting at the middle of FILENAME. If we set LOSE, that |
| 981 | means we've discovered that we can't do that cool trick. */ |
| 982 | bool lose = 0; |
| 983 | char *p = nm; |
| 984 | |
| 985 | while (*p) |
| 986 | { |
| 987 | /* Since we know the name is absolute, we can assume that each |
| 988 | element starts with a "/". */ |
| 989 | |
| 990 | /* "." and ".." are hairy. */ |
| 991 | if (IS_DIRECTORY_SEP (p[0]) |
| 992 | && p[1] == '.' |
| 993 | && (IS_DIRECTORY_SEP (p[2]) |
| 994 | || p[2] == 0 |
| 995 | || (p[2] == '.' && (IS_DIRECTORY_SEP (p[3]) |
| 996 | || p[3] == 0)))) |
| 997 | lose = 1; |
| 998 | /* We want to replace multiple `/' in a row with a single |
| 999 | slash. */ |
| 1000 | else if (p > nm |
| 1001 | && IS_DIRECTORY_SEP (p[0]) |
| 1002 | && IS_DIRECTORY_SEP (p[1])) |
| 1003 | lose = 1; |
| 1004 | p++; |
| 1005 | } |
| 1006 | if (!lose) |
| 1007 | { |
| 1008 | #ifdef DOS_NT |
| 1009 | /* Make sure directories are all separated with /, but |
| 1010 | avoid allocation of a new string when not required. */ |
| 1011 | if (multibyte) |
| 1012 | { |
| 1013 | Lisp_Object tem_name = make_specified_string (nm, -1, strlen (nm), |
| 1014 | multibyte); |
| 1015 | |
| 1016 | tem_name = ENCODE_FILE (tem_name); |
| 1017 | dostounix_filename (SSDATA (tem_name)); |
| 1018 | tem_name = DECODE_FILE (tem_name); |
| 1019 | memcpy (nm, SSDATA (tem_name), SBYTES (tem_name) + 1); |
| 1020 | } |
| 1021 | else |
| 1022 | dostounix_filename (nm); |
| 1023 | #ifdef WINDOWSNT |
| 1024 | if (IS_DIRECTORY_SEP (nm[1])) |
| 1025 | { |
| 1026 | if (strcmp (nm, SSDATA (name)) != 0) |
| 1027 | name = make_specified_string (nm, -1, strlen (nm), multibyte); |
| 1028 | } |
| 1029 | else |
| 1030 | #endif |
| 1031 | /* Drive must be set, so this is okay. */ |
| 1032 | if (strcmp (nm - 2, SSDATA (name)) != 0) |
| 1033 | { |
| 1034 | char temp[] = " :"; |
| 1035 | |
| 1036 | name = make_specified_string (nm, -1, p - nm, multibyte); |
| 1037 | temp[0] = DRIVE_LETTER (drive); |
| 1038 | name = concat2 (build_string (temp), name); |
| 1039 | } |
| 1040 | return name; |
| 1041 | #else /* not DOS_NT */ |
| 1042 | if (strcmp (nm, SSDATA (name)) == 0) |
| 1043 | return name; |
| 1044 | return make_specified_string (nm, -1, strlen (nm), multibyte); |
| 1045 | #endif /* not DOS_NT */ |
| 1046 | } |
| 1047 | } |
| 1048 | |
| 1049 | /* At this point, nm might or might not be an absolute file name. We |
| 1050 | need to expand ~ or ~user if present, otherwise prefix nm with |
| 1051 | default_directory if nm is not absolute, and finally collapse /./ |
| 1052 | and /foo/../ sequences. |
| 1053 | |
| 1054 | We set newdir to be the appropriate prefix if one is needed: |
| 1055 | - the relevant user directory if nm starts with ~ or ~user |
| 1056 | - the specified drive's working dir (DOS/NT only) if nm does not |
| 1057 | start with / |
| 1058 | - the value of default_directory. |
| 1059 | |
| 1060 | Note that these prefixes are not guaranteed to be absolute (except |
| 1061 | for the working dir of a drive). Therefore, to ensure we always |
| 1062 | return an absolute name, if the final prefix is not absolute we |
| 1063 | append it to the current working directory. */ |
| 1064 | |
| 1065 | newdir = 0; |
| 1066 | |
| 1067 | if (nm[0] == '~') /* prefix ~ */ |
| 1068 | { |
| 1069 | if (IS_DIRECTORY_SEP (nm[1]) |
| 1070 | || nm[1] == 0) /* ~ by itself */ |
| 1071 | { |
| 1072 | Lisp_Object tem; |
| 1073 | |
| 1074 | if (!(newdir = egetenv ("HOME"))) |
| 1075 | newdir = ""; |
| 1076 | nm++; |
| 1077 | /* `egetenv' may return a unibyte string, which will bite us since |
| 1078 | we expect the directory to be multibyte. */ |
| 1079 | tem = build_string (newdir); |
| 1080 | if (multibyte && !STRING_MULTIBYTE (tem)) |
| 1081 | { |
| 1082 | hdir = DECODE_FILE (tem); |
| 1083 | newdir = SSDATA (hdir); |
| 1084 | } |
| 1085 | #ifdef DOS_NT |
| 1086 | collapse_newdir = 0; |
| 1087 | #endif |
| 1088 | } |
| 1089 | else /* ~user/filename */ |
| 1090 | { |
| 1091 | char *o, *p; |
| 1092 | for (p = nm; *p && (!IS_DIRECTORY_SEP (*p)); p++); |
| 1093 | o = alloca (p - nm + 1); |
| 1094 | memcpy (o, nm, p - nm); |
| 1095 | o [p - nm] = 0; |
| 1096 | |
| 1097 | block_input (); |
| 1098 | pw = getpwnam (o + 1); |
| 1099 | unblock_input (); |
| 1100 | if (pw) |
| 1101 | { |
| 1102 | Lisp_Object tem; |
| 1103 | |
| 1104 | newdir = pw->pw_dir; |
| 1105 | /* `getpwnam' may return a unibyte string, which will |
| 1106 | bite us since we expect the directory to be |
| 1107 | multibyte. */ |
| 1108 | tem = build_string (newdir); |
| 1109 | if (multibyte && !STRING_MULTIBYTE (tem)) |
| 1110 | { |
| 1111 | hdir = DECODE_FILE (tem); |
| 1112 | newdir = SSDATA (hdir); |
| 1113 | } |
| 1114 | nm = p; |
| 1115 | #ifdef DOS_NT |
| 1116 | collapse_newdir = 0; |
| 1117 | #endif |
| 1118 | } |
| 1119 | |
| 1120 | /* If we don't find a user of that name, leave the name |
| 1121 | unchanged; don't move nm forward to p. */ |
| 1122 | } |
| 1123 | } |
| 1124 | |
| 1125 | #ifdef DOS_NT |
| 1126 | /* On DOS and Windows, nm is absolute if a drive name was specified; |
| 1127 | use the drive's current directory as the prefix if needed. */ |
| 1128 | if (!newdir && drive) |
| 1129 | { |
| 1130 | /* Get default directory if needed to make nm absolute. */ |
| 1131 | char *adir = NULL; |
| 1132 | if (!IS_DIRECTORY_SEP (nm[0])) |
| 1133 | { |
| 1134 | adir = alloca (MAXPATHLEN + 1); |
| 1135 | if (!getdefdir (c_toupper (drive) - 'A' + 1, adir)) |
| 1136 | adir = NULL; |
| 1137 | else if (multibyte) |
| 1138 | { |
| 1139 | Lisp_Object tem = build_string (adir); |
| 1140 | |
| 1141 | tem = DECODE_FILE (tem); |
| 1142 | memcpy (adir, SSDATA (tem), SBYTES (tem) + 1); |
| 1143 | } |
| 1144 | } |
| 1145 | if (!adir) |
| 1146 | { |
| 1147 | /* Either nm starts with /, or drive isn't mounted. */ |
| 1148 | adir = alloca (4); |
| 1149 | adir[0] = DRIVE_LETTER (drive); |
| 1150 | adir[1] = ':'; |
| 1151 | adir[2] = '/'; |
| 1152 | adir[3] = 0; |
| 1153 | } |
| 1154 | newdir = adir; |
| 1155 | } |
| 1156 | #endif /* DOS_NT */ |
| 1157 | |
| 1158 | /* Finally, if no prefix has been specified and nm is not absolute, |
| 1159 | then it must be expanded relative to default_directory. */ |
| 1160 | |
| 1161 | if (1 |
| 1162 | #ifndef DOS_NT |
| 1163 | /* /... alone is not absolute on DOS and Windows. */ |
| 1164 | && !IS_DIRECTORY_SEP (nm[0]) |
| 1165 | #endif |
| 1166 | #ifdef WINDOWSNT |
| 1167 | && !(IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1])) |
| 1168 | #endif |
| 1169 | && !newdir) |
| 1170 | { |
| 1171 | newdir = SSDATA (default_directory); |
| 1172 | #ifdef DOS_NT |
| 1173 | /* Note if special escape prefix is present, but remove for now. */ |
| 1174 | if (newdir[0] == '/' && newdir[1] == ':') |
| 1175 | { |
| 1176 | is_escaped = 1; |
| 1177 | newdir += 2; |
| 1178 | } |
| 1179 | #endif |
| 1180 | } |
| 1181 | |
| 1182 | #ifdef DOS_NT |
| 1183 | if (newdir) |
| 1184 | { |
| 1185 | /* First ensure newdir is an absolute name. */ |
| 1186 | if ( |
| 1187 | /* Detect MSDOS file names with drive specifiers. */ |
| 1188 | ! (IS_DRIVE (newdir[0]) |
| 1189 | && IS_DEVICE_SEP (newdir[1]) && IS_DIRECTORY_SEP (newdir[2])) |
| 1190 | #ifdef WINDOWSNT |
| 1191 | /* Detect Windows file names in UNC format. */ |
| 1192 | && ! (IS_DIRECTORY_SEP (newdir[0]) && IS_DIRECTORY_SEP (newdir[1])) |
| 1193 | #endif |
| 1194 | ) |
| 1195 | { |
| 1196 | /* Effectively, let newdir be (expand-file-name newdir cwd). |
| 1197 | Because of the admonition against calling expand-file-name |
| 1198 | when we have pointers into lisp strings, we accomplish this |
| 1199 | indirectly by prepending newdir to nm if necessary, and using |
| 1200 | cwd (or the wd of newdir's drive) as the new newdir. */ |
| 1201 | char *adir; |
| 1202 | |
| 1203 | if (IS_DRIVE (newdir[0]) && IS_DEVICE_SEP (newdir[1])) |
| 1204 | { |
| 1205 | drive = (unsigned char) newdir[0]; |
| 1206 | newdir += 2; |
| 1207 | } |
| 1208 | if (!IS_DIRECTORY_SEP (nm[0])) |
| 1209 | { |
| 1210 | ptrdiff_t newlen = strlen (newdir); |
| 1211 | char *tmp = alloca (newlen + strlen (nm) + 2); |
| 1212 | file_name_as_directory (tmp, newdir, newlen, multibyte); |
| 1213 | strcat (tmp, nm); |
| 1214 | nm = tmp; |
| 1215 | } |
| 1216 | adir = alloca (MAXPATHLEN + 1); |
| 1217 | if (drive) |
| 1218 | { |
| 1219 | if (!getdefdir (c_toupper (drive) - 'A' + 1, adir)) |
| 1220 | strcpy (adir, "/"); |
| 1221 | } |
| 1222 | else |
| 1223 | getcwd (adir, MAXPATHLEN + 1); |
| 1224 | if (multibyte) |
| 1225 | { |
| 1226 | Lisp_Object tem = build_string (adir); |
| 1227 | |
| 1228 | tem = DECODE_FILE (tem); |
| 1229 | memcpy (adir, SSDATA (tem), SBYTES (tem) + 1); |
| 1230 | } |
| 1231 | newdir = adir; |
| 1232 | } |
| 1233 | |
| 1234 | /* Strip off drive name from prefix, if present. */ |
| 1235 | if (IS_DRIVE (newdir[0]) && IS_DEVICE_SEP (newdir[1])) |
| 1236 | { |
| 1237 | drive = newdir[0]; |
| 1238 | newdir += 2; |
| 1239 | } |
| 1240 | |
| 1241 | /* Keep only a prefix from newdir if nm starts with slash |
| 1242 | (//server/share for UNC, nothing otherwise). */ |
| 1243 | if (IS_DIRECTORY_SEP (nm[0]) && collapse_newdir) |
| 1244 | { |
| 1245 | #ifdef WINDOWSNT |
| 1246 | if (IS_DIRECTORY_SEP (newdir[0]) && IS_DIRECTORY_SEP (newdir[1])) |
| 1247 | { |
| 1248 | char *adir = strcpy (alloca (strlen (newdir) + 1), newdir); |
| 1249 | char *p = adir + 2; |
| 1250 | while (*p && !IS_DIRECTORY_SEP (*p)) p++; |
| 1251 | p++; |
| 1252 | while (*p && !IS_DIRECTORY_SEP (*p)) p++; |
| 1253 | *p = 0; |
| 1254 | newdir = adir; |
| 1255 | } |
| 1256 | else |
| 1257 | #endif |
| 1258 | newdir = ""; |
| 1259 | } |
| 1260 | } |
| 1261 | #endif /* DOS_NT */ |
| 1262 | |
| 1263 | if (newdir) |
| 1264 | { |
| 1265 | /* Get rid of any slash at the end of newdir, unless newdir is |
| 1266 | just / or // (an incomplete UNC name). */ |
| 1267 | length = strlen (newdir); |
| 1268 | tlen = length + 1; |
| 1269 | if (length > 1 && IS_DIRECTORY_SEP (newdir[length - 1]) |
| 1270 | #ifdef WINDOWSNT |
| 1271 | && !(length == 2 && IS_DIRECTORY_SEP (newdir[0])) |
| 1272 | #endif |
| 1273 | ) |
| 1274 | { |
| 1275 | char *temp = alloca (length); |
| 1276 | memcpy (temp, newdir, length - 1); |
| 1277 | temp[length - 1] = 0; |
| 1278 | length--; |
| 1279 | newdir = temp; |
| 1280 | } |
| 1281 | } |
| 1282 | else |
| 1283 | { |
| 1284 | length = 0; |
| 1285 | tlen = 0; |
| 1286 | } |
| 1287 | |
| 1288 | /* Now concatenate the directory and name to new space in the stack frame. */ |
| 1289 | tlen += strlen (nm) + 1; |
| 1290 | #ifdef DOS_NT |
| 1291 | /* Reserve space for drive specifier and escape prefix, since either |
| 1292 | or both may need to be inserted. (The Microsoft x86 compiler |
| 1293 | produces incorrect code if the following two lines are combined.) */ |
| 1294 | target = alloca (tlen + 4); |
| 1295 | target += 4; |
| 1296 | #else /* not DOS_NT */ |
| 1297 | target = alloca (tlen); |
| 1298 | #endif /* not DOS_NT */ |
| 1299 | *target = 0; |
| 1300 | |
| 1301 | if (newdir) |
| 1302 | { |
| 1303 | if (nm[0] == 0 || IS_DIRECTORY_SEP (nm[0])) |
| 1304 | { |
| 1305 | #ifdef DOS_NT |
| 1306 | /* If newdir is effectively "C:/", then the drive letter will have |
| 1307 | been stripped and newdir will be "/". Concatenating with an |
| 1308 | absolute directory in nm produces "//", which will then be |
| 1309 | incorrectly treated as a network share. Ignore newdir in |
| 1310 | this case (keeping the drive letter). */ |
| 1311 | if (!(drive && nm[0] && IS_DIRECTORY_SEP (newdir[0]) |
| 1312 | && newdir[1] == '\0')) |
| 1313 | #endif |
| 1314 | strcpy (target, newdir); |
| 1315 | } |
| 1316 | else |
| 1317 | file_name_as_directory (target, newdir, length, multibyte); |
| 1318 | } |
| 1319 | |
| 1320 | strcat (target, nm); |
| 1321 | |
| 1322 | /* Now canonicalize by removing `//', `/.' and `/foo/..' if they |
| 1323 | appear. */ |
| 1324 | { |
| 1325 | char *p = target; |
| 1326 | char *o = target; |
| 1327 | |
| 1328 | while (*p) |
| 1329 | { |
| 1330 | if (!IS_DIRECTORY_SEP (*p)) |
| 1331 | { |
| 1332 | *o++ = *p++; |
| 1333 | } |
| 1334 | else if (p[1] == '.' |
| 1335 | && (IS_DIRECTORY_SEP (p[2]) |
| 1336 | || p[2] == 0)) |
| 1337 | { |
| 1338 | /* If "/." is the entire filename, keep the "/". Otherwise, |
| 1339 | just delete the whole "/.". */ |
| 1340 | if (o == target && p[2] == '\0') |
| 1341 | *o++ = *p; |
| 1342 | p += 2; |
| 1343 | } |
| 1344 | else if (p[1] == '.' && p[2] == '.' |
| 1345 | /* `/../' is the "superroot" on certain file systems. |
| 1346 | Turned off on DOS_NT systems because they have no |
| 1347 | "superroot" and because this causes us to produce |
| 1348 | file names like "d:/../foo" which fail file-related |
| 1349 | functions of the underlying OS. (To reproduce, try a |
| 1350 | long series of "../../" in default_directory, longer |
| 1351 | than the number of levels from the root.) */ |
| 1352 | #ifndef DOS_NT |
| 1353 | && o != target |
| 1354 | #endif |
| 1355 | && (IS_DIRECTORY_SEP (p[3]) || p[3] == 0)) |
| 1356 | { |
| 1357 | #ifdef WINDOWSNT |
| 1358 | char *prev_o = o; |
| 1359 | #endif |
| 1360 | while (o != target && (--o) && !IS_DIRECTORY_SEP (*o)) |
| 1361 | ; |
| 1362 | #ifdef WINDOWSNT |
| 1363 | /* Don't go below server level in UNC filenames. */ |
| 1364 | if (o == target + 1 && IS_DIRECTORY_SEP (*o) |
| 1365 | && IS_DIRECTORY_SEP (*target)) |
| 1366 | o = prev_o; |
| 1367 | else |
| 1368 | #endif |
| 1369 | /* Keep initial / only if this is the whole name. */ |
| 1370 | if (o == target && IS_ANY_SEP (*o) && p[3] == 0) |
| 1371 | ++o; |
| 1372 | p += 3; |
| 1373 | } |
| 1374 | else if (p > target && IS_DIRECTORY_SEP (p[1])) |
| 1375 | /* Collapse multiple `/' in a row. */ |
| 1376 | p++; |
| 1377 | else |
| 1378 | { |
| 1379 | *o++ = *p++; |
| 1380 | } |
| 1381 | } |
| 1382 | |
| 1383 | #ifdef DOS_NT |
| 1384 | /* At last, set drive name. */ |
| 1385 | #ifdef WINDOWSNT |
| 1386 | /* Except for network file name. */ |
| 1387 | if (!(IS_DIRECTORY_SEP (target[0]) && IS_DIRECTORY_SEP (target[1]))) |
| 1388 | #endif /* WINDOWSNT */ |
| 1389 | { |
| 1390 | if (!drive) emacs_abort (); |
| 1391 | target -= 2; |
| 1392 | target[0] = DRIVE_LETTER (drive); |
| 1393 | target[1] = ':'; |
| 1394 | } |
| 1395 | /* Reinsert the escape prefix if required. */ |
| 1396 | if (is_escaped) |
| 1397 | { |
| 1398 | target -= 2; |
| 1399 | target[0] = '/'; |
| 1400 | target[1] = ':'; |
| 1401 | } |
| 1402 | result = make_specified_string (target, -1, o - target, multibyte); |
| 1403 | if (multibyte) |
| 1404 | { |
| 1405 | result = ENCODE_FILE (result); |
| 1406 | dostounix_filename (SSDATA (result)); |
| 1407 | result = DECODE_FILE (result); |
| 1408 | } |
| 1409 | else |
| 1410 | dostounix_filename (SSDATA (result)); |
| 1411 | #else /* !DOS_NT */ |
| 1412 | result = make_specified_string (target, -1, o - target, multibyte); |
| 1413 | #endif /* !DOS_NT */ |
| 1414 | } |
| 1415 | |
| 1416 | /* Again look to see if the file name has special constructs in it |
| 1417 | and perhaps call the corresponding file handler. This is needed |
| 1418 | for filenames such as "/foo/../user@host:/bar/../baz". Expanding |
| 1419 | the ".." component gives us "/user@host:/bar/../baz" which needs |
| 1420 | to be expanded again. */ |
| 1421 | handler = Ffind_file_name_handler (result, Qexpand_file_name); |
| 1422 | if (!NILP (handler)) |
| 1423 | { |
| 1424 | handled_name = call3 (handler, Qexpand_file_name, |
| 1425 | result, default_directory); |
| 1426 | if (STRINGP (handled_name)) |
| 1427 | return handled_name; |
| 1428 | error ("Invalid handler in `file-name-handler-alist'"); |
| 1429 | } |
| 1430 | |
| 1431 | return result; |
| 1432 | } |
| 1433 | |
| 1434 | #if 0 |
| 1435 | /* PLEASE DO NOT DELETE THIS COMMENTED-OUT VERSION! |
| 1436 | This is the old version of expand-file-name, before it was thoroughly |
| 1437 | rewritten for Emacs 10.31. We leave this version here commented-out, |
| 1438 | because the code is very complex and likely to have subtle bugs. If |
| 1439 | bugs _are_ found, it might be of interest to look at the old code and |
| 1440 | see what did it do in the relevant situation. |
| 1441 | |
| 1442 | Don't remove this code: it's true that it will be accessible |
| 1443 | from the repository, but a few years from deletion, people will |
| 1444 | forget it is there. */ |
| 1445 | |
| 1446 | /* Changed this DEFUN to a DEAFUN, so as not to confuse `make-docfile'. */ |
| 1447 | DEAFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0, |
| 1448 | "Convert FILENAME to absolute, and canonicalize it.\n\ |
| 1449 | Second arg DEFAULT is directory to start with if FILENAME is relative\n\ |
| 1450 | \(does not start with slash); if DEFAULT is nil or missing,\n\ |
| 1451 | the current buffer's value of default-directory is used.\n\ |
| 1452 | Filenames containing `.' or `..' as components are simplified;\n\ |
| 1453 | initial `~/' expands to your home directory.\n\ |
| 1454 | See also the function `substitute-in-file-name'.") |
| 1455 | (name, defalt) |
| 1456 | Lisp_Object name, defalt; |
| 1457 | { |
| 1458 | unsigned char *nm; |
| 1459 | |
| 1460 | register unsigned char *newdir, *p, *o; |
| 1461 | ptrdiff_t tlen; |
| 1462 | unsigned char *target; |
| 1463 | struct passwd *pw; |
| 1464 | |
| 1465 | CHECK_STRING (name); |
| 1466 | nm = SDATA (name); |
| 1467 | |
| 1468 | /* If nm is absolute, flush ...// and detect /./ and /../. |
| 1469 | If no /./ or /../ we can return right away. */ |
| 1470 | if (nm[0] == '/') |
| 1471 | { |
| 1472 | bool lose = 0; |
| 1473 | p = nm; |
| 1474 | while (*p) |
| 1475 | { |
| 1476 | if (p[0] == '/' && p[1] == '/') |
| 1477 | nm = p + 1; |
| 1478 | if (p[0] == '/' && p[1] == '~') |
| 1479 | nm = p + 1, lose = 1; |
| 1480 | if (p[0] == '/' && p[1] == '.' |
| 1481 | && (p[2] == '/' || p[2] == 0 |
| 1482 | || (p[2] == '.' && (p[3] == '/' || p[3] == 0)))) |
| 1483 | lose = 1; |
| 1484 | p++; |
| 1485 | } |
| 1486 | if (!lose) |
| 1487 | { |
| 1488 | if (nm == SDATA (name)) |
| 1489 | return name; |
| 1490 | return build_string (nm); |
| 1491 | } |
| 1492 | } |
| 1493 | |
| 1494 | /* Now determine directory to start with and put it in NEWDIR. */ |
| 1495 | |
| 1496 | newdir = 0; |
| 1497 | |
| 1498 | if (nm[0] == '~') /* prefix ~ */ |
| 1499 | if (nm[1] == '/' || nm[1] == 0)/* ~/filename */ |
| 1500 | { |
| 1501 | if (!(newdir = (unsigned char *) egetenv ("HOME"))) |
| 1502 | newdir = (unsigned char *) ""; |
| 1503 | nm++; |
| 1504 | } |
| 1505 | else /* ~user/filename */ |
| 1506 | { |
| 1507 | /* Get past ~ to user. */ |
| 1508 | unsigned char *user = nm + 1; |
| 1509 | /* Find end of name. */ |
| 1510 | unsigned char *ptr = (unsigned char *) strchr (user, '/'); |
| 1511 | ptrdiff_t len = ptr ? ptr - user : strlen (user); |
| 1512 | /* Copy the user name into temp storage. */ |
| 1513 | o = alloca (len + 1); |
| 1514 | memcpy (o, user, len); |
| 1515 | o[len] = 0; |
| 1516 | |
| 1517 | /* Look up the user name. */ |
| 1518 | block_input (); |
| 1519 | pw = (struct passwd *) getpwnam (o + 1); |
| 1520 | unblock_input (); |
| 1521 | if (!pw) |
| 1522 | error ("\"%s\" isn't a registered user", o + 1); |
| 1523 | |
| 1524 | newdir = (unsigned char *) pw->pw_dir; |
| 1525 | |
| 1526 | /* Discard the user name from NM. */ |
| 1527 | nm += len; |
| 1528 | } |
| 1529 | |
| 1530 | if (nm[0] != '/' && !newdir) |
| 1531 | { |
| 1532 | if (NILP (defalt)) |
| 1533 | defalt = current_buffer->directory; |
| 1534 | CHECK_STRING (defalt); |
| 1535 | newdir = SDATA (defalt); |
| 1536 | } |
| 1537 | |
| 1538 | /* Now concatenate the directory and name to new space in the stack frame. */ |
| 1539 | |
| 1540 | tlen = (newdir ? strlen (newdir) + 1 : 0) + strlen (nm) + 1; |
| 1541 | target = alloca (tlen); |
| 1542 | *target = 0; |
| 1543 | |
| 1544 | if (newdir) |
| 1545 | { |
| 1546 | if (nm[0] == 0 || nm[0] == '/') |
| 1547 | strcpy (target, newdir); |
| 1548 | else |
| 1549 | file_name_as_directory (target, newdir); |
| 1550 | } |
| 1551 | |
| 1552 | strcat (target, nm); |
| 1553 | |
| 1554 | /* Now canonicalize by removing /. and /foo/.. if they appear. */ |
| 1555 | |
| 1556 | p = target; |
| 1557 | o = target; |
| 1558 | |
| 1559 | while (*p) |
| 1560 | { |
| 1561 | if (*p != '/') |
| 1562 | { |
| 1563 | *o++ = *p++; |
| 1564 | } |
| 1565 | else if (!strncmp (p, "//", 2) |
| 1566 | ) |
| 1567 | { |
| 1568 | o = target; |
| 1569 | p++; |
| 1570 | } |
| 1571 | else if (p[0] == '/' && p[1] == '.' |
| 1572 | && (p[2] == '/' || p[2] == 0)) |
| 1573 | p += 2; |
| 1574 | else if (!strncmp (p, "/..", 3) |
| 1575 | /* `/../' is the "superroot" on certain file systems. */ |
| 1576 | && o != target |
| 1577 | && (p[3] == '/' || p[3] == 0)) |
| 1578 | { |
| 1579 | while (o != target && *--o != '/') |
| 1580 | ; |
| 1581 | if (o == target && *o == '/') |
| 1582 | ++o; |
| 1583 | p += 3; |
| 1584 | } |
| 1585 | else |
| 1586 | { |
| 1587 | *o++ = *p++; |
| 1588 | } |
| 1589 | } |
| 1590 | |
| 1591 | return make_string (target, o - target); |
| 1592 | } |
| 1593 | #endif |
| 1594 | \f |
| 1595 | /* If /~ or // appears, discard everything through first slash. */ |
| 1596 | static bool |
| 1597 | file_name_absolute_p (const char *filename) |
| 1598 | { |
| 1599 | return |
| 1600 | (IS_DIRECTORY_SEP (*filename) || *filename == '~' |
| 1601 | #ifdef DOS_NT |
| 1602 | || (IS_DRIVE (*filename) && IS_DEVICE_SEP (filename[1]) |
| 1603 | && IS_DIRECTORY_SEP (filename[2])) |
| 1604 | #endif |
| 1605 | ); |
| 1606 | } |
| 1607 | |
| 1608 | static char * |
| 1609 | search_embedded_absfilename (char *nm, char *endp) |
| 1610 | { |
| 1611 | char *p, *s; |
| 1612 | |
| 1613 | for (p = nm + 1; p < endp; p++) |
| 1614 | { |
| 1615 | if (IS_DIRECTORY_SEP (p[-1]) |
| 1616 | && file_name_absolute_p (p) |
| 1617 | #if defined (WINDOWSNT) || defined (CYGWIN) |
| 1618 | /* // at start of file name is meaningful in Apollo, |
| 1619 | WindowsNT and Cygwin systems. */ |
| 1620 | && !(IS_DIRECTORY_SEP (p[0]) && p - 1 == nm) |
| 1621 | #endif /* not (WINDOWSNT || CYGWIN) */ |
| 1622 | ) |
| 1623 | { |
| 1624 | for (s = p; *s && !IS_DIRECTORY_SEP (*s); s++); |
| 1625 | if (p[0] == '~' && s > p + 1) /* We've got "/~something/". */ |
| 1626 | { |
| 1627 | char *o = alloca (s - p + 1); |
| 1628 | struct passwd *pw; |
| 1629 | memcpy (o, p, s - p); |
| 1630 | o [s - p] = 0; |
| 1631 | |
| 1632 | /* If we have ~user and `user' exists, discard |
| 1633 | everything up to ~. But if `user' does not exist, leave |
| 1634 | ~user alone, it might be a literal file name. */ |
| 1635 | block_input (); |
| 1636 | pw = getpwnam (o + 1); |
| 1637 | unblock_input (); |
| 1638 | if (pw) |
| 1639 | return p; |
| 1640 | } |
| 1641 | else |
| 1642 | return p; |
| 1643 | } |
| 1644 | } |
| 1645 | return NULL; |
| 1646 | } |
| 1647 | |
| 1648 | DEFUN ("substitute-in-file-name", Fsubstitute_in_file_name, |
| 1649 | Ssubstitute_in_file_name, 1, 1, 0, |
| 1650 | doc: /* Substitute environment variables referred to in FILENAME. |
| 1651 | `$FOO' where FOO is an environment variable name means to substitute |
| 1652 | the value of that variable. The variable name should be terminated |
| 1653 | with a character not a letter, digit or underscore; otherwise, enclose |
| 1654 | the entire variable name in braces. |
| 1655 | |
| 1656 | If `/~' appears, all of FILENAME through that `/' is discarded. |
| 1657 | If `//' appears, everything up to and including the first of |
| 1658 | those `/' is discarded. */) |
| 1659 | (Lisp_Object filename) |
| 1660 | { |
| 1661 | char *nm, *s, *p, *o, *x, *endp; |
| 1662 | char *target = NULL; |
| 1663 | ptrdiff_t total = 0; |
| 1664 | bool substituted = 0; |
| 1665 | bool multibyte; |
| 1666 | char *xnm; |
| 1667 | Lisp_Object handler; |
| 1668 | |
| 1669 | CHECK_STRING (filename); |
| 1670 | |
| 1671 | multibyte = STRING_MULTIBYTE (filename); |
| 1672 | |
| 1673 | /* If the file name has special constructs in it, |
| 1674 | call the corresponding file handler. */ |
| 1675 | handler = Ffind_file_name_handler (filename, Qsubstitute_in_file_name); |
| 1676 | if (!NILP (handler)) |
| 1677 | { |
| 1678 | Lisp_Object handled_name = call2 (handler, Qsubstitute_in_file_name, |
| 1679 | filename); |
| 1680 | if (STRINGP (handled_name)) |
| 1681 | return handled_name; |
| 1682 | error ("Invalid handler in `file-name-handler-alist'"); |
| 1683 | } |
| 1684 | |
| 1685 | /* Always work on a copy of the string, in case GC happens during |
| 1686 | decode of environment variables, causing the original Lisp_String |
| 1687 | data to be relocated. */ |
| 1688 | nm = alloca (SBYTES (filename) + 1); |
| 1689 | memcpy (nm, SDATA (filename), SBYTES (filename) + 1); |
| 1690 | |
| 1691 | #ifdef DOS_NT |
| 1692 | if (multibyte) |
| 1693 | { |
| 1694 | Lisp_Object encoded_filename = ENCODE_FILE (filename); |
| 1695 | Lisp_Object tem_fn; |
| 1696 | |
| 1697 | dostounix_filename (SDATA (encoded_filename)); |
| 1698 | tem_fn = DECODE_FILE (encoded_filename); |
| 1699 | nm = alloca (SBYTES (tem_fn) + 1); |
| 1700 | memcpy (nm, SDATA (tem_fn), SBYTES (tem_fn) + 1); |
| 1701 | substituted = (memcmp (nm, SDATA (filename), SBYTES (filename)) != 0); |
| 1702 | if (substituted) |
| 1703 | filename = tem_fn; |
| 1704 | } |
| 1705 | else |
| 1706 | { |
| 1707 | dostounix_filename (nm); |
| 1708 | substituted = (memcmp (nm, SDATA (filename), SBYTES (filename)) != 0); |
| 1709 | } |
| 1710 | #endif |
| 1711 | endp = nm + SBYTES (filename); |
| 1712 | |
| 1713 | /* If /~ or // appears, discard everything through first slash. */ |
| 1714 | p = search_embedded_absfilename (nm, endp); |
| 1715 | if (p) |
| 1716 | /* Start over with the new string, so we check the file-name-handler |
| 1717 | again. Important with filenames like "/home/foo//:/hello///there" |
| 1718 | which would substitute to "/:/hello///there" rather than "/there". */ |
| 1719 | return Fsubstitute_in_file_name |
| 1720 | (make_specified_string (p, -1, endp - p, multibyte)); |
| 1721 | |
| 1722 | /* See if any variables are substituted into the string |
| 1723 | and find the total length of their values in `total'. */ |
| 1724 | |
| 1725 | for (p = nm; p != endp;) |
| 1726 | if (*p != '$') |
| 1727 | p++; |
| 1728 | else |
| 1729 | { |
| 1730 | p++; |
| 1731 | if (p == endp) |
| 1732 | goto badsubst; |
| 1733 | else if (*p == '$') |
| 1734 | { |
| 1735 | /* "$$" means a single "$". */ |
| 1736 | p++; |
| 1737 | total -= 1; |
| 1738 | substituted = 1; |
| 1739 | continue; |
| 1740 | } |
| 1741 | else if (*p == '{') |
| 1742 | { |
| 1743 | o = ++p; |
| 1744 | while (p != endp && *p != '}') p++; |
| 1745 | if (*p != '}') goto missingclose; |
| 1746 | s = p; |
| 1747 | } |
| 1748 | else |
| 1749 | { |
| 1750 | o = p; |
| 1751 | while (p != endp && (c_isalnum (*p) || *p == '_')) p++; |
| 1752 | s = p; |
| 1753 | } |
| 1754 | |
| 1755 | /* Copy out the variable name. */ |
| 1756 | target = alloca (s - o + 1); |
| 1757 | memcpy (target, o, s - o); |
| 1758 | target[s - o] = 0; |
| 1759 | #ifdef DOS_NT |
| 1760 | strupr (target); /* $home == $HOME etc. */ |
| 1761 | #endif /* DOS_NT */ |
| 1762 | |
| 1763 | /* Get variable value. */ |
| 1764 | o = egetenv (target); |
| 1765 | if (o) |
| 1766 | { |
| 1767 | /* Don't try to guess a maximum length - UTF8 can use up to |
| 1768 | four bytes per character. This code is unlikely to run |
| 1769 | in a situation that requires performance, so decoding the |
| 1770 | env variables twice should be acceptable. Note that |
| 1771 | decoding may cause a garbage collect. */ |
| 1772 | Lisp_Object orig, decoded; |
| 1773 | orig = build_unibyte_string (o); |
| 1774 | decoded = DECODE_FILE (orig); |
| 1775 | total += SBYTES (decoded); |
| 1776 | substituted = 1; |
| 1777 | } |
| 1778 | else if (*p == '}') |
| 1779 | goto badvar; |
| 1780 | } |
| 1781 | |
| 1782 | if (!substituted) |
| 1783 | return filename; |
| 1784 | |
| 1785 | /* If substitution required, recopy the string and do it. */ |
| 1786 | /* Make space in stack frame for the new copy. */ |
| 1787 | xnm = alloca (SBYTES (filename) + total + 1); |
| 1788 | x = xnm; |
| 1789 | |
| 1790 | /* Copy the rest of the name through, replacing $ constructs with values. */ |
| 1791 | for (p = nm; *p;) |
| 1792 | if (*p != '$') |
| 1793 | *x++ = *p++; |
| 1794 | else |
| 1795 | { |
| 1796 | p++; |
| 1797 | if (p == endp) |
| 1798 | goto badsubst; |
| 1799 | else if (*p == '$') |
| 1800 | { |
| 1801 | *x++ = *p++; |
| 1802 | continue; |
| 1803 | } |
| 1804 | else if (*p == '{') |
| 1805 | { |
| 1806 | o = ++p; |
| 1807 | while (p != endp && *p != '}') p++; |
| 1808 | if (*p != '}') goto missingclose; |
| 1809 | s = p++; |
| 1810 | } |
| 1811 | else |
| 1812 | { |
| 1813 | o = p; |
| 1814 | while (p != endp && (c_isalnum (*p) || *p == '_')) p++; |
| 1815 | s = p; |
| 1816 | } |
| 1817 | |
| 1818 | /* Copy out the variable name. */ |
| 1819 | target = alloca (s - o + 1); |
| 1820 | memcpy (target, o, s - o); |
| 1821 | target[s - o] = 0; |
| 1822 | #ifdef DOS_NT |
| 1823 | strupr (target); /* $home == $HOME etc. */ |
| 1824 | #endif /* DOS_NT */ |
| 1825 | |
| 1826 | /* Get variable value. */ |
| 1827 | o = egetenv (target); |
| 1828 | if (!o) |
| 1829 | { |
| 1830 | *x++ = '$'; |
| 1831 | strcpy (x, target); x+= strlen (target); |
| 1832 | } |
| 1833 | else |
| 1834 | { |
| 1835 | Lisp_Object orig, decoded; |
| 1836 | ptrdiff_t orig_length, decoded_length; |
| 1837 | orig_length = strlen (o); |
| 1838 | orig = make_unibyte_string (o, orig_length); |
| 1839 | decoded = DECODE_FILE (orig); |
| 1840 | decoded_length = SBYTES (decoded); |
| 1841 | memcpy (x, SDATA (decoded), decoded_length); |
| 1842 | x += decoded_length; |
| 1843 | |
| 1844 | /* If environment variable needed decoding, return value |
| 1845 | needs to be multibyte. */ |
| 1846 | if (decoded_length != orig_length |
| 1847 | || memcmp (SDATA (decoded), o, orig_length)) |
| 1848 | multibyte = 1; |
| 1849 | } |
| 1850 | } |
| 1851 | |
| 1852 | *x = 0; |
| 1853 | |
| 1854 | /* If /~ or // appears, discard everything through first slash. */ |
| 1855 | while ((p = search_embedded_absfilename (xnm, x)) != NULL) |
| 1856 | /* This time we do not start over because we've already expanded envvars |
| 1857 | and replaced $$ with $. Maybe we should start over as well, but we'd |
| 1858 | need to quote some $ to $$ first. */ |
| 1859 | xnm = p; |
| 1860 | |
| 1861 | return make_specified_string (xnm, -1, x - xnm, multibyte); |
| 1862 | |
| 1863 | badsubst: |
| 1864 | error ("Bad format environment-variable substitution"); |
| 1865 | missingclose: |
| 1866 | error ("Missing \"}\" in environment-variable substitution"); |
| 1867 | badvar: |
| 1868 | error ("Substituting nonexistent environment variable \"%s\"", target); |
| 1869 | |
| 1870 | /* NOTREACHED */ |
| 1871 | return Qnil; |
| 1872 | } |
| 1873 | \f |
| 1874 | /* A slightly faster and more convenient way to get |
| 1875 | (directory-file-name (expand-file-name FOO)). */ |
| 1876 | |
| 1877 | Lisp_Object |
| 1878 | expand_and_dir_to_file (Lisp_Object filename, Lisp_Object defdir) |
| 1879 | { |
| 1880 | register Lisp_Object absname; |
| 1881 | |
| 1882 | absname = Fexpand_file_name (filename, defdir); |
| 1883 | |
| 1884 | /* Remove final slash, if any (unless this is the root dir). |
| 1885 | stat behaves differently depending! */ |
| 1886 | if (SCHARS (absname) > 1 |
| 1887 | && IS_DIRECTORY_SEP (SREF (absname, SBYTES (absname) - 1)) |
| 1888 | && !IS_DEVICE_SEP (SREF (absname, SBYTES (absname) - 2))) |
| 1889 | /* We cannot take shortcuts; they might be wrong for magic file names. */ |
| 1890 | absname = Fdirectory_file_name (absname); |
| 1891 | return absname; |
| 1892 | } |
| 1893 | \f |
| 1894 | /* Signal an error if the file ABSNAME already exists. |
| 1895 | If INTERACTIVE, ask the user whether to proceed, |
| 1896 | and bypass the error if the user says to go ahead. |
| 1897 | QUERYSTRING is a name for the action that is being considered |
| 1898 | to alter the file. |
| 1899 | |
| 1900 | *STATPTR is used to store the stat information if the file exists. |
| 1901 | If the file does not exist, STATPTR->st_mode is set to 0. |
| 1902 | If STATPTR is null, we don't store into it. |
| 1903 | |
| 1904 | If QUICK, ask for y or n, not yes or no. */ |
| 1905 | |
| 1906 | static void |
| 1907 | barf_or_query_if_file_exists (Lisp_Object absname, const char *querystring, |
| 1908 | bool interactive, struct stat *statptr, |
| 1909 | bool quick) |
| 1910 | { |
| 1911 | Lisp_Object tem, encoded_filename; |
| 1912 | struct stat statbuf; |
| 1913 | struct gcpro gcpro1; |
| 1914 | |
| 1915 | encoded_filename = ENCODE_FILE (absname); |
| 1916 | |
| 1917 | /* `stat' is a good way to tell whether the file exists, |
| 1918 | regardless of what access permissions it has. */ |
| 1919 | if (lstat (SSDATA (encoded_filename), &statbuf) >= 0) |
| 1920 | { |
| 1921 | if (S_ISDIR (statbuf.st_mode)) |
| 1922 | xsignal2 (Qfile_error, |
| 1923 | build_string ("File is a directory"), absname); |
| 1924 | |
| 1925 | if (! interactive) |
| 1926 | xsignal2 (Qfile_already_exists, |
| 1927 | build_string ("File already exists"), absname); |
| 1928 | GCPRO1 (absname); |
| 1929 | tem = format2 ("File %s already exists; %s anyway? ", |
| 1930 | absname, build_string (querystring)); |
| 1931 | if (quick) |
| 1932 | tem = call1 (intern ("y-or-n-p"), tem); |
| 1933 | else |
| 1934 | tem = do_yes_or_no_p (tem); |
| 1935 | UNGCPRO; |
| 1936 | if (NILP (tem)) |
| 1937 | xsignal2 (Qfile_already_exists, |
| 1938 | build_string ("File already exists"), absname); |
| 1939 | if (statptr) |
| 1940 | *statptr = statbuf; |
| 1941 | } |
| 1942 | else |
| 1943 | { |
| 1944 | if (statptr) |
| 1945 | statptr->st_mode = 0; |
| 1946 | } |
| 1947 | return; |
| 1948 | } |
| 1949 | |
| 1950 | DEFUN ("copy-file", Fcopy_file, Scopy_file, 2, 6, |
| 1951 | "fCopy file: \nGCopy %s to file: \np\nP", |
| 1952 | doc: /* Copy FILE to NEWNAME. Both args must be strings. |
| 1953 | If NEWNAME names a directory, copy FILE there. |
| 1954 | |
| 1955 | This function always sets the file modes of the output file to match |
| 1956 | the input file. |
| 1957 | |
| 1958 | The optional third argument OK-IF-ALREADY-EXISTS specifies what to do |
| 1959 | if file NEWNAME already exists. If OK-IF-ALREADY-EXISTS is nil, we |
| 1960 | signal a `file-already-exists' error without overwriting. If |
| 1961 | OK-IF-ALREADY-EXISTS is a number, we request confirmation from the user |
| 1962 | about overwriting; this is what happens in interactive use with M-x. |
| 1963 | Any other value for OK-IF-ALREADY-EXISTS means to overwrite the |
| 1964 | existing file. |
| 1965 | |
| 1966 | Fourth arg KEEP-TIME non-nil means give the output file the same |
| 1967 | last-modified time as the old one. (This works on only some systems.) |
| 1968 | |
| 1969 | A prefix arg makes KEEP-TIME non-nil. |
| 1970 | |
| 1971 | If PRESERVE-UID-GID is non-nil, we try to transfer the |
| 1972 | uid and gid of FILE to NEWNAME. |
| 1973 | |
| 1974 | If PRESERVE-EXTENDED-ATTRIBUTES is non-nil, we try to copy additional |
| 1975 | attributes of FILE to NEWNAME, such as its SELinux context and ACL |
| 1976 | entries (depending on how Emacs was built). */) |
| 1977 | (Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists, Lisp_Object keep_time, Lisp_Object preserve_uid_gid, Lisp_Object preserve_extended_attributes) |
| 1978 | { |
| 1979 | int ifd, ofd; |
| 1980 | int n; |
| 1981 | char buf[16 * 1024]; |
| 1982 | struct stat st, out_st; |
| 1983 | Lisp_Object handler; |
| 1984 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; |
| 1985 | ptrdiff_t count = SPECPDL_INDEX (); |
| 1986 | Lisp_Object encoded_file, encoded_newname; |
| 1987 | #if HAVE_LIBSELINUX |
| 1988 | security_context_t con; |
| 1989 | int conlength = 0; |
| 1990 | #endif |
| 1991 | #ifdef HAVE_POSIX_ACL |
| 1992 | acl_t acl = NULL; |
| 1993 | #endif |
| 1994 | |
| 1995 | encoded_file = encoded_newname = Qnil; |
| 1996 | GCPRO4 (file, newname, encoded_file, encoded_newname); |
| 1997 | CHECK_STRING (file); |
| 1998 | CHECK_STRING (newname); |
| 1999 | |
| 2000 | if (!NILP (Ffile_directory_p (newname))) |
| 2001 | newname = Fexpand_file_name (Ffile_name_nondirectory (file), newname); |
| 2002 | else |
| 2003 | newname = Fexpand_file_name (newname, Qnil); |
| 2004 | |
| 2005 | file = Fexpand_file_name (file, Qnil); |
| 2006 | |
| 2007 | /* If the input file name has special constructs in it, |
| 2008 | call the corresponding file handler. */ |
| 2009 | handler = Ffind_file_name_handler (file, Qcopy_file); |
| 2010 | /* Likewise for output file name. */ |
| 2011 | if (NILP (handler)) |
| 2012 | handler = Ffind_file_name_handler (newname, Qcopy_file); |
| 2013 | if (!NILP (handler)) |
| 2014 | RETURN_UNGCPRO (call7 (handler, Qcopy_file, file, newname, |
| 2015 | ok_if_already_exists, keep_time, preserve_uid_gid, |
| 2016 | preserve_extended_attributes)); |
| 2017 | |
| 2018 | encoded_file = ENCODE_FILE (file); |
| 2019 | encoded_newname = ENCODE_FILE (newname); |
| 2020 | |
| 2021 | if (NILP (ok_if_already_exists) |
| 2022 | || INTEGERP (ok_if_already_exists)) |
| 2023 | barf_or_query_if_file_exists (newname, "copy to it", |
| 2024 | INTEGERP (ok_if_already_exists), &out_st, 0); |
| 2025 | else if (stat (SSDATA (encoded_newname), &out_st) < 0) |
| 2026 | out_st.st_mode = 0; |
| 2027 | |
| 2028 | #ifdef WINDOWSNT |
| 2029 | if (!NILP (preserve_extended_attributes)) |
| 2030 | { |
| 2031 | #ifdef HAVE_POSIX_ACL |
| 2032 | acl = acl_get_file (SDATA (encoded_file), ACL_TYPE_ACCESS); |
| 2033 | if (acl == NULL && errno != ENOTSUP) |
| 2034 | report_file_error ("Getting ACL", Fcons (file, Qnil)); |
| 2035 | #endif |
| 2036 | } |
| 2037 | if (!CopyFile (SDATA (encoded_file), |
| 2038 | SDATA (encoded_newname), |
| 2039 | FALSE)) |
| 2040 | { |
| 2041 | /* CopyFile doesn't set errno when it fails. By far the most |
| 2042 | "popular" reason is that the target is read-only. */ |
| 2043 | if (GetLastError () == 5) |
| 2044 | errno = EACCES; |
| 2045 | else |
| 2046 | errno = EPERM; |
| 2047 | report_file_error ("Copying file", Fcons (file, Fcons (newname, Qnil))); |
| 2048 | } |
| 2049 | /* CopyFile retains the timestamp by default. */ |
| 2050 | else if (NILP (keep_time)) |
| 2051 | { |
| 2052 | EMACS_TIME now; |
| 2053 | DWORD attributes; |
| 2054 | char * filename; |
| 2055 | |
| 2056 | filename = SDATA (encoded_newname); |
| 2057 | |
| 2058 | /* Ensure file is writable while its modified time is set. */ |
| 2059 | attributes = GetFileAttributes (filename); |
| 2060 | SetFileAttributes (filename, attributes & ~FILE_ATTRIBUTE_READONLY); |
| 2061 | now = current_emacs_time (); |
| 2062 | if (set_file_times (-1, filename, now, now)) |
| 2063 | { |
| 2064 | /* Restore original attributes. */ |
| 2065 | SetFileAttributes (filename, attributes); |
| 2066 | xsignal2 (Qfile_date_error, |
| 2067 | build_string ("Cannot set file date"), newname); |
| 2068 | } |
| 2069 | /* Restore original attributes. */ |
| 2070 | SetFileAttributes (filename, attributes); |
| 2071 | } |
| 2072 | #ifdef HAVE_POSIX_ACL |
| 2073 | if (acl != NULL) |
| 2074 | { |
| 2075 | bool fail = |
| 2076 | acl_set_file (SDATA (encoded_newname), ACL_TYPE_ACCESS, acl) != 0; |
| 2077 | if (fail && errno != ENOTSUP) |
| 2078 | report_file_error ("Setting ACL", Fcons (newname, Qnil)); |
| 2079 | |
| 2080 | acl_free (acl); |
| 2081 | } |
| 2082 | #endif |
| 2083 | #else /* not WINDOWSNT */ |
| 2084 | immediate_quit = 1; |
| 2085 | ifd = emacs_open (SSDATA (encoded_file), O_RDONLY, 0); |
| 2086 | immediate_quit = 0; |
| 2087 | |
| 2088 | if (ifd < 0) |
| 2089 | report_file_error ("Opening input file", Fcons (file, Qnil)); |
| 2090 | |
| 2091 | record_unwind_protect (close_file_unwind, make_number (ifd)); |
| 2092 | |
| 2093 | if (fstat (ifd, &st) != 0) |
| 2094 | report_file_error ("Input file status", Fcons (file, Qnil)); |
| 2095 | |
| 2096 | if (!NILP (preserve_extended_attributes)) |
| 2097 | { |
| 2098 | #if HAVE_LIBSELINUX |
| 2099 | if (is_selinux_enabled ()) |
| 2100 | { |
| 2101 | conlength = fgetfilecon (ifd, &con); |
| 2102 | if (conlength == -1) |
| 2103 | report_file_error ("Doing fgetfilecon", Fcons (file, Qnil)); |
| 2104 | } |
| 2105 | #endif |
| 2106 | |
| 2107 | #ifdef HAVE_POSIX_ACL |
| 2108 | acl = acl_get_fd (ifd); |
| 2109 | if (acl == NULL && errno != ENOTSUP) |
| 2110 | report_file_error ("Getting ACL", Fcons (file, Qnil)); |
| 2111 | #endif |
| 2112 | } |
| 2113 | |
| 2114 | if (out_st.st_mode != 0 |
| 2115 | && st.st_dev == out_st.st_dev && st.st_ino == out_st.st_ino) |
| 2116 | { |
| 2117 | errno = 0; |
| 2118 | report_file_error ("Input and output files are the same", |
| 2119 | Fcons (file, Fcons (newname, Qnil))); |
| 2120 | } |
| 2121 | |
| 2122 | /* We can copy only regular files. */ |
| 2123 | if (!S_ISREG (st.st_mode)) |
| 2124 | { |
| 2125 | /* Get a better looking error message. */ |
| 2126 | errno = S_ISDIR (st.st_mode) ? EISDIR : EINVAL; |
| 2127 | report_file_error ("Non-regular file", Fcons (file, Qnil)); |
| 2128 | } |
| 2129 | |
| 2130 | #ifdef MSDOS |
| 2131 | /* System's default file type was set to binary by _fmode in emacs.c. */ |
| 2132 | ofd = emacs_open (SDATA (encoded_newname), |
| 2133 | O_WRONLY | O_TRUNC | O_CREAT |
| 2134 | | (NILP (ok_if_already_exists) ? O_EXCL : 0), |
| 2135 | S_IREAD | S_IWRITE); |
| 2136 | #else /* not MSDOS */ |
| 2137 | { |
| 2138 | mode_t new_mask = !NILP (preserve_uid_gid) ? 0600 : 0666; |
| 2139 | new_mask &= st.st_mode; |
| 2140 | ofd = emacs_open (SSDATA (encoded_newname), |
| 2141 | (O_WRONLY | O_TRUNC | O_CREAT |
| 2142 | | (NILP (ok_if_already_exists) ? O_EXCL : 0)), |
| 2143 | new_mask); |
| 2144 | } |
| 2145 | #endif /* not MSDOS */ |
| 2146 | if (ofd < 0) |
| 2147 | report_file_error ("Opening output file", Fcons (newname, Qnil)); |
| 2148 | |
| 2149 | record_unwind_protect (close_file_unwind, make_number (ofd)); |
| 2150 | |
| 2151 | immediate_quit = 1; |
| 2152 | QUIT; |
| 2153 | while ((n = emacs_read (ifd, buf, sizeof buf)) > 0) |
| 2154 | if (emacs_write (ofd, buf, n) != n) |
| 2155 | report_file_error ("I/O error", Fcons (newname, Qnil)); |
| 2156 | immediate_quit = 0; |
| 2157 | |
| 2158 | #ifndef MSDOS |
| 2159 | /* Preserve the original file modes, and if requested, also its |
| 2160 | owner and group. */ |
| 2161 | { |
| 2162 | mode_t mode_mask = 07777; |
| 2163 | if (!NILP (preserve_uid_gid)) |
| 2164 | { |
| 2165 | /* Attempt to change owner and group. If that doesn't work |
| 2166 | attempt to change just the group, as that is sometimes allowed. |
| 2167 | Adjust the mode mask to eliminate setuid or setgid bits |
| 2168 | that are inappropriate if the owner and group are wrong. */ |
| 2169 | if (fchown (ofd, st.st_uid, st.st_gid) != 0) |
| 2170 | { |
| 2171 | mode_mask &= ~06000; |
| 2172 | if (fchown (ofd, -1, st.st_gid) == 0) |
| 2173 | mode_mask |= 02000; |
| 2174 | } |
| 2175 | } |
| 2176 | if (fchmod (ofd, st.st_mode & mode_mask) != 0) |
| 2177 | report_file_error ("Doing chmod", Fcons (newname, Qnil)); |
| 2178 | } |
| 2179 | #endif /* not MSDOS */ |
| 2180 | |
| 2181 | #if HAVE_LIBSELINUX |
| 2182 | if (conlength > 0) |
| 2183 | { |
| 2184 | /* Set the modified context back to the file. */ |
| 2185 | bool fail = fsetfilecon (ofd, con) != 0; |
| 2186 | /* See http://debbugs.gnu.org/11245 for ENOTSUP. */ |
| 2187 | if (fail && errno != ENOTSUP) |
| 2188 | report_file_error ("Doing fsetfilecon", Fcons (newname, Qnil)); |
| 2189 | |
| 2190 | freecon (con); |
| 2191 | } |
| 2192 | #endif |
| 2193 | |
| 2194 | #ifdef HAVE_POSIX_ACL |
| 2195 | if (acl != NULL) |
| 2196 | { |
| 2197 | bool fail = acl_set_fd (ofd, acl) != 0; |
| 2198 | if (fail && errno != ENOTSUP) |
| 2199 | report_file_error ("Setting ACL", Fcons (newname, Qnil)); |
| 2200 | |
| 2201 | acl_free (acl); |
| 2202 | } |
| 2203 | #endif |
| 2204 | |
| 2205 | if (!NILP (keep_time)) |
| 2206 | { |
| 2207 | EMACS_TIME atime = get_stat_atime (&st); |
| 2208 | EMACS_TIME mtime = get_stat_mtime (&st); |
| 2209 | if (set_file_times (ofd, SSDATA (encoded_newname), atime, mtime)) |
| 2210 | xsignal2 (Qfile_date_error, |
| 2211 | build_string ("Cannot set file date"), newname); |
| 2212 | } |
| 2213 | |
| 2214 | if (emacs_close (ofd) < 0) |
| 2215 | report_file_error ("I/O error", Fcons (newname, Qnil)); |
| 2216 | |
| 2217 | emacs_close (ifd); |
| 2218 | |
| 2219 | #ifdef MSDOS |
| 2220 | /* In DJGPP v2.0 and later, fstat usually returns true file mode bits, |
| 2221 | and if it can't, it tells so. Otherwise, under MSDOS we usually |
| 2222 | get only the READ bit, which will make the copied file read-only, |
| 2223 | so it's better not to chmod at all. */ |
| 2224 | if ((_djstat_flags & _STFAIL_WRITEBIT) == 0) |
| 2225 | chmod (SDATA (encoded_newname), st.st_mode & 07777); |
| 2226 | #endif /* MSDOS */ |
| 2227 | #endif /* not WINDOWSNT */ |
| 2228 | |
| 2229 | /* Discard the unwind protects. */ |
| 2230 | specpdl_ptr = specpdl + count; |
| 2231 | |
| 2232 | UNGCPRO; |
| 2233 | return Qnil; |
| 2234 | } |
| 2235 | \f |
| 2236 | DEFUN ("make-directory-internal", Fmake_directory_internal, |
| 2237 | Smake_directory_internal, 1, 1, 0, |
| 2238 | doc: /* Create a new directory named DIRECTORY. */) |
| 2239 | (Lisp_Object directory) |
| 2240 | { |
| 2241 | const char *dir; |
| 2242 | Lisp_Object handler; |
| 2243 | Lisp_Object encoded_dir; |
| 2244 | |
| 2245 | CHECK_STRING (directory); |
| 2246 | directory = Fexpand_file_name (directory, Qnil); |
| 2247 | |
| 2248 | handler = Ffind_file_name_handler (directory, Qmake_directory_internal); |
| 2249 | if (!NILP (handler)) |
| 2250 | return call2 (handler, Qmake_directory_internal, directory); |
| 2251 | |
| 2252 | encoded_dir = ENCODE_FILE (directory); |
| 2253 | |
| 2254 | dir = SSDATA (encoded_dir); |
| 2255 | |
| 2256 | #ifdef WINDOWSNT |
| 2257 | if (mkdir (dir) != 0) |
| 2258 | #else |
| 2259 | if (mkdir (dir, 0777 & ~auto_saving_dir_umask) != 0) |
| 2260 | #endif |
| 2261 | report_file_error ("Creating directory", list1 (directory)); |
| 2262 | |
| 2263 | return Qnil; |
| 2264 | } |
| 2265 | |
| 2266 | DEFUN ("delete-directory-internal", Fdelete_directory_internal, |
| 2267 | Sdelete_directory_internal, 1, 1, 0, |
| 2268 | doc: /* Delete the directory named DIRECTORY. Does not follow symlinks. */) |
| 2269 | (Lisp_Object directory) |
| 2270 | { |
| 2271 | const char *dir; |
| 2272 | Lisp_Object encoded_dir; |
| 2273 | |
| 2274 | CHECK_STRING (directory); |
| 2275 | directory = Fdirectory_file_name (Fexpand_file_name (directory, Qnil)); |
| 2276 | encoded_dir = ENCODE_FILE (directory); |
| 2277 | dir = SSDATA (encoded_dir); |
| 2278 | |
| 2279 | if (rmdir (dir) != 0) |
| 2280 | report_file_error ("Removing directory", list1 (directory)); |
| 2281 | |
| 2282 | return Qnil; |
| 2283 | } |
| 2284 | |
| 2285 | DEFUN ("delete-file", Fdelete_file, Sdelete_file, 1, 2, |
| 2286 | "(list (read-file-name \ |
| 2287 | (if (and delete-by-moving-to-trash (null current-prefix-arg)) \ |
| 2288 | \"Move file to trash: \" \"Delete file: \") \ |
| 2289 | nil default-directory (confirm-nonexistent-file-or-buffer)) \ |
| 2290 | (null current-prefix-arg))", |
| 2291 | doc: /* Delete file named FILENAME. If it is a symlink, remove the symlink. |
| 2292 | If file has multiple names, it continues to exist with the other names. |
| 2293 | TRASH non-nil means to trash the file instead of deleting, provided |
| 2294 | `delete-by-moving-to-trash' is non-nil. |
| 2295 | |
| 2296 | When called interactively, TRASH is t if no prefix argument is given. |
| 2297 | With a prefix argument, TRASH is nil. */) |
| 2298 | (Lisp_Object filename, Lisp_Object trash) |
| 2299 | { |
| 2300 | Lisp_Object handler; |
| 2301 | Lisp_Object encoded_file; |
| 2302 | struct gcpro gcpro1; |
| 2303 | |
| 2304 | GCPRO1 (filename); |
| 2305 | if (!NILP (Ffile_directory_p (filename)) |
| 2306 | && NILP (Ffile_symlink_p (filename))) |
| 2307 | xsignal2 (Qfile_error, |
| 2308 | build_string ("Removing old name: is a directory"), |
| 2309 | filename); |
| 2310 | UNGCPRO; |
| 2311 | filename = Fexpand_file_name (filename, Qnil); |
| 2312 | |
| 2313 | handler = Ffind_file_name_handler (filename, Qdelete_file); |
| 2314 | if (!NILP (handler)) |
| 2315 | return call3 (handler, Qdelete_file, filename, trash); |
| 2316 | |
| 2317 | if (delete_by_moving_to_trash && !NILP (trash)) |
| 2318 | return call1 (Qmove_file_to_trash, filename); |
| 2319 | |
| 2320 | encoded_file = ENCODE_FILE (filename); |
| 2321 | |
| 2322 | if (unlink (SSDATA (encoded_file)) < 0) |
| 2323 | report_file_error ("Removing old name", list1 (filename)); |
| 2324 | return Qnil; |
| 2325 | } |
| 2326 | |
| 2327 | static Lisp_Object |
| 2328 | internal_delete_file_1 (Lisp_Object ignore) |
| 2329 | { |
| 2330 | return Qt; |
| 2331 | } |
| 2332 | |
| 2333 | /* Delete file FILENAME, returning true if successful. |
| 2334 | This ignores `delete-by-moving-to-trash'. */ |
| 2335 | |
| 2336 | bool |
| 2337 | internal_delete_file (Lisp_Object filename) |
| 2338 | { |
| 2339 | Lisp_Object tem; |
| 2340 | |
| 2341 | tem = internal_condition_case_2 (Fdelete_file, filename, Qnil, |
| 2342 | Qt, internal_delete_file_1); |
| 2343 | return NILP (tem); |
| 2344 | } |
| 2345 | \f |
| 2346 | DEFUN ("rename-file", Frename_file, Srename_file, 2, 3, |
| 2347 | "fRename file: \nGRename %s to file: \np", |
| 2348 | doc: /* Rename FILE as NEWNAME. Both args must be strings. |
| 2349 | If file has names other than FILE, it continues to have those names. |
| 2350 | Signals a `file-already-exists' error if a file NEWNAME already exists |
| 2351 | unless optional third argument OK-IF-ALREADY-EXISTS is non-nil. |
| 2352 | A number as third arg means request confirmation if NEWNAME already exists. |
| 2353 | This is what happens in interactive use with M-x. */) |
| 2354 | (Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists) |
| 2355 | { |
| 2356 | Lisp_Object handler; |
| 2357 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5; |
| 2358 | Lisp_Object encoded_file, encoded_newname, symlink_target; |
| 2359 | |
| 2360 | symlink_target = encoded_file = encoded_newname = Qnil; |
| 2361 | GCPRO5 (file, newname, encoded_file, encoded_newname, symlink_target); |
| 2362 | CHECK_STRING (file); |
| 2363 | CHECK_STRING (newname); |
| 2364 | file = Fexpand_file_name (file, Qnil); |
| 2365 | |
| 2366 | if ((!NILP (Ffile_directory_p (newname))) |
| 2367 | #ifdef DOS_NT |
| 2368 | /* If the file names are identical but for the case, |
| 2369 | don't attempt to move directory to itself. */ |
| 2370 | && (NILP (Fstring_equal (Fdowncase (file), Fdowncase (newname)))) |
| 2371 | #endif |
| 2372 | ) |
| 2373 | { |
| 2374 | Lisp_Object fname = (NILP (Ffile_directory_p (file)) |
| 2375 | ? file : Fdirectory_file_name (file)); |
| 2376 | newname = Fexpand_file_name (Ffile_name_nondirectory (fname), newname); |
| 2377 | } |
| 2378 | else |
| 2379 | newname = Fexpand_file_name (newname, Qnil); |
| 2380 | |
| 2381 | /* If the file name has special constructs in it, |
| 2382 | call the corresponding file handler. */ |
| 2383 | handler = Ffind_file_name_handler (file, Qrename_file); |
| 2384 | if (NILP (handler)) |
| 2385 | handler = Ffind_file_name_handler (newname, Qrename_file); |
| 2386 | if (!NILP (handler)) |
| 2387 | RETURN_UNGCPRO (call4 (handler, Qrename_file, |
| 2388 | file, newname, ok_if_already_exists)); |
| 2389 | |
| 2390 | encoded_file = ENCODE_FILE (file); |
| 2391 | encoded_newname = ENCODE_FILE (newname); |
| 2392 | |
| 2393 | #ifdef DOS_NT |
| 2394 | /* If the file names are identical but for the case, don't ask for |
| 2395 | confirmation: they simply want to change the letter-case of the |
| 2396 | file name. */ |
| 2397 | if (NILP (Fstring_equal (Fdowncase (file), Fdowncase (newname)))) |
| 2398 | #endif |
| 2399 | if (NILP (ok_if_already_exists) |
| 2400 | || INTEGERP (ok_if_already_exists)) |
| 2401 | barf_or_query_if_file_exists (newname, "rename to it", |
| 2402 | INTEGERP (ok_if_already_exists), 0, 0); |
| 2403 | if (rename (SSDATA (encoded_file), SSDATA (encoded_newname)) < 0) |
| 2404 | { |
| 2405 | if (errno == EXDEV) |
| 2406 | { |
| 2407 | ptrdiff_t count; |
| 2408 | symlink_target = Ffile_symlink_p (file); |
| 2409 | if (! NILP (symlink_target)) |
| 2410 | Fmake_symbolic_link (symlink_target, newname, |
| 2411 | NILP (ok_if_already_exists) ? Qnil : Qt); |
| 2412 | else if (!NILP (Ffile_directory_p (file))) |
| 2413 | call4 (Qcopy_directory, file, newname, Qt, Qnil); |
| 2414 | else |
| 2415 | /* We have already prompted if it was an integer, so don't |
| 2416 | have copy-file prompt again. */ |
| 2417 | Fcopy_file (file, newname, |
| 2418 | NILP (ok_if_already_exists) ? Qnil : Qt, |
| 2419 | Qt, Qt, Qt); |
| 2420 | |
| 2421 | count = SPECPDL_INDEX (); |
| 2422 | specbind (Qdelete_by_moving_to_trash, Qnil); |
| 2423 | |
| 2424 | if (!NILP (Ffile_directory_p (file)) && NILP (symlink_target)) |
| 2425 | call2 (Qdelete_directory, file, Qt); |
| 2426 | else |
| 2427 | Fdelete_file (file, Qnil); |
| 2428 | unbind_to (count, Qnil); |
| 2429 | } |
| 2430 | else |
| 2431 | report_file_error ("Renaming", list2 (file, newname)); |
| 2432 | } |
| 2433 | UNGCPRO; |
| 2434 | return Qnil; |
| 2435 | } |
| 2436 | |
| 2437 | DEFUN ("add-name-to-file", Fadd_name_to_file, Sadd_name_to_file, 2, 3, |
| 2438 | "fAdd name to file: \nGName to add to %s: \np", |
| 2439 | doc: /* Give FILE additional name NEWNAME. Both args must be strings. |
| 2440 | Signals a `file-already-exists' error if a file NEWNAME already exists |
| 2441 | unless optional third argument OK-IF-ALREADY-EXISTS is non-nil. |
| 2442 | A number as third arg means request confirmation if NEWNAME already exists. |
| 2443 | This is what happens in interactive use with M-x. */) |
| 2444 | (Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists) |
| 2445 | { |
| 2446 | Lisp_Object handler; |
| 2447 | Lisp_Object encoded_file, encoded_newname; |
| 2448 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; |
| 2449 | |
| 2450 | GCPRO4 (file, newname, encoded_file, encoded_newname); |
| 2451 | encoded_file = encoded_newname = Qnil; |
| 2452 | CHECK_STRING (file); |
| 2453 | CHECK_STRING (newname); |
| 2454 | file = Fexpand_file_name (file, Qnil); |
| 2455 | |
| 2456 | if (!NILP (Ffile_directory_p (newname))) |
| 2457 | newname = Fexpand_file_name (Ffile_name_nondirectory (file), newname); |
| 2458 | else |
| 2459 | newname = Fexpand_file_name (newname, Qnil); |
| 2460 | |
| 2461 | /* If the file name has special constructs in it, |
| 2462 | call the corresponding file handler. */ |
| 2463 | handler = Ffind_file_name_handler (file, Qadd_name_to_file); |
| 2464 | if (!NILP (handler)) |
| 2465 | RETURN_UNGCPRO (call4 (handler, Qadd_name_to_file, file, |
| 2466 | newname, ok_if_already_exists)); |
| 2467 | |
| 2468 | /* If the new name has special constructs in it, |
| 2469 | call the corresponding file handler. */ |
| 2470 | handler = Ffind_file_name_handler (newname, Qadd_name_to_file); |
| 2471 | if (!NILP (handler)) |
| 2472 | RETURN_UNGCPRO (call4 (handler, Qadd_name_to_file, file, |
| 2473 | newname, ok_if_already_exists)); |
| 2474 | |
| 2475 | encoded_file = ENCODE_FILE (file); |
| 2476 | encoded_newname = ENCODE_FILE (newname); |
| 2477 | |
| 2478 | if (NILP (ok_if_already_exists) |
| 2479 | || INTEGERP (ok_if_already_exists)) |
| 2480 | barf_or_query_if_file_exists (newname, "make it a new name", |
| 2481 | INTEGERP (ok_if_already_exists), 0, 0); |
| 2482 | |
| 2483 | unlink (SSDATA (newname)); |
| 2484 | if (link (SSDATA (encoded_file), SSDATA (encoded_newname)) < 0) |
| 2485 | report_file_error ("Adding new name", list2 (file, newname)); |
| 2486 | |
| 2487 | UNGCPRO; |
| 2488 | return Qnil; |
| 2489 | } |
| 2490 | |
| 2491 | DEFUN ("make-symbolic-link", Fmake_symbolic_link, Smake_symbolic_link, 2, 3, |
| 2492 | "FMake symbolic link to file: \nGMake symbolic link to file %s: \np", |
| 2493 | doc: /* Make a symbolic link to FILENAME, named LINKNAME. |
| 2494 | Both args must be strings. |
| 2495 | Signals a `file-already-exists' error if a file LINKNAME already exists |
| 2496 | unless optional third argument OK-IF-ALREADY-EXISTS is non-nil. |
| 2497 | A number as third arg means request confirmation if LINKNAME already exists. |
| 2498 | This happens for interactive use with M-x. */) |
| 2499 | (Lisp_Object filename, Lisp_Object linkname, Lisp_Object ok_if_already_exists) |
| 2500 | { |
| 2501 | Lisp_Object handler; |
| 2502 | Lisp_Object encoded_filename, encoded_linkname; |
| 2503 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; |
| 2504 | |
| 2505 | GCPRO4 (filename, linkname, encoded_filename, encoded_linkname); |
| 2506 | encoded_filename = encoded_linkname = Qnil; |
| 2507 | CHECK_STRING (filename); |
| 2508 | CHECK_STRING (linkname); |
| 2509 | /* If the link target has a ~, we must expand it to get |
| 2510 | a truly valid file name. Otherwise, do not expand; |
| 2511 | we want to permit links to relative file names. */ |
| 2512 | if (SREF (filename, 0) == '~') |
| 2513 | filename = Fexpand_file_name (filename, Qnil); |
| 2514 | |
| 2515 | if (!NILP (Ffile_directory_p (linkname))) |
| 2516 | linkname = Fexpand_file_name (Ffile_name_nondirectory (filename), linkname); |
| 2517 | else |
| 2518 | linkname = Fexpand_file_name (linkname, Qnil); |
| 2519 | |
| 2520 | /* If the file name has special constructs in it, |
| 2521 | call the corresponding file handler. */ |
| 2522 | handler = Ffind_file_name_handler (filename, Qmake_symbolic_link); |
| 2523 | if (!NILP (handler)) |
| 2524 | RETURN_UNGCPRO (call4 (handler, Qmake_symbolic_link, filename, |
| 2525 | linkname, ok_if_already_exists)); |
| 2526 | |
| 2527 | /* If the new link name has special constructs in it, |
| 2528 | call the corresponding file handler. */ |
| 2529 | handler = Ffind_file_name_handler (linkname, Qmake_symbolic_link); |
| 2530 | if (!NILP (handler)) |
| 2531 | RETURN_UNGCPRO (call4 (handler, Qmake_symbolic_link, filename, |
| 2532 | linkname, ok_if_already_exists)); |
| 2533 | |
| 2534 | encoded_filename = ENCODE_FILE (filename); |
| 2535 | encoded_linkname = ENCODE_FILE (linkname); |
| 2536 | |
| 2537 | if (NILP (ok_if_already_exists) |
| 2538 | || INTEGERP (ok_if_already_exists)) |
| 2539 | barf_or_query_if_file_exists (linkname, "make it a link", |
| 2540 | INTEGERP (ok_if_already_exists), 0, 0); |
| 2541 | if (symlink (SSDATA (encoded_filename), SSDATA (encoded_linkname)) < 0) |
| 2542 | { |
| 2543 | /* If we didn't complain already, silently delete existing file. */ |
| 2544 | if (errno == EEXIST) |
| 2545 | { |
| 2546 | unlink (SSDATA (encoded_linkname)); |
| 2547 | if (symlink (SSDATA (encoded_filename), SSDATA (encoded_linkname)) |
| 2548 | >= 0) |
| 2549 | { |
| 2550 | UNGCPRO; |
| 2551 | return Qnil; |
| 2552 | } |
| 2553 | } |
| 2554 | if (errno == ENOSYS) |
| 2555 | { |
| 2556 | UNGCPRO; |
| 2557 | xsignal1 (Qfile_error, |
| 2558 | build_string ("Symbolic links are not supported")); |
| 2559 | } |
| 2560 | |
| 2561 | report_file_error ("Making symbolic link", list2 (filename, linkname)); |
| 2562 | } |
| 2563 | UNGCPRO; |
| 2564 | return Qnil; |
| 2565 | } |
| 2566 | |
| 2567 | \f |
| 2568 | DEFUN ("file-name-absolute-p", Ffile_name_absolute_p, Sfile_name_absolute_p, |
| 2569 | 1, 1, 0, |
| 2570 | doc: /* Return t if file FILENAME specifies an absolute file name. |
| 2571 | On Unix, this is a name starting with a `/' or a `~'. */) |
| 2572 | (Lisp_Object filename) |
| 2573 | { |
| 2574 | CHECK_STRING (filename); |
| 2575 | return file_name_absolute_p (SSDATA (filename)) ? Qt : Qnil; |
| 2576 | } |
| 2577 | \f |
| 2578 | /* Return true if FILENAME exists. */ |
| 2579 | bool |
| 2580 | check_existing (const char *filename) |
| 2581 | { |
| 2582 | return faccessat (AT_FDCWD, filename, F_OK, AT_EACCESS) == 0; |
| 2583 | } |
| 2584 | |
| 2585 | /* Return true if file FILENAME exists and can be executed. */ |
| 2586 | |
| 2587 | static bool |
| 2588 | check_executable (char *filename) |
| 2589 | { |
| 2590 | return faccessat (AT_FDCWD, filename, X_OK, AT_EACCESS) == 0; |
| 2591 | } |
| 2592 | |
| 2593 | /* Return true if file FILENAME exists and can be accessed |
| 2594 | according to AMODE, which should include W_OK. |
| 2595 | On failure, return false and set errno. */ |
| 2596 | |
| 2597 | static bool |
| 2598 | check_writable (const char *filename, int amode) |
| 2599 | { |
| 2600 | #ifdef MSDOS |
| 2601 | /* FIXME: an faccessat implementation should be added to the |
| 2602 | DOS/Windows ports and this #ifdef branch should be removed. */ |
| 2603 | struct stat st; |
| 2604 | if (stat (filename, &st) < 0) |
| 2605 | return 0; |
| 2606 | errno = EPERM; |
| 2607 | return (st.st_mode & S_IWRITE || S_ISDIR (st.st_mode)); |
| 2608 | #else /* not MSDOS */ |
| 2609 | bool res = faccessat (AT_FDCWD, filename, amode, AT_EACCESS) == 0; |
| 2610 | #ifdef CYGWIN |
| 2611 | /* faccessat may have returned failure because Cygwin couldn't |
| 2612 | determine the file's UID or GID; if so, we return success. */ |
| 2613 | if (!res) |
| 2614 | { |
| 2615 | int faccessat_errno = errno; |
| 2616 | struct stat st; |
| 2617 | if (stat (filename, &st) < 0) |
| 2618 | return 0; |
| 2619 | res = (st.st_uid == -1 || st.st_gid == -1); |
| 2620 | errno = faccessat_errno; |
| 2621 | } |
| 2622 | #endif /* CYGWIN */ |
| 2623 | return res; |
| 2624 | #endif /* not MSDOS */ |
| 2625 | } |
| 2626 | |
| 2627 | DEFUN ("file-exists-p", Ffile_exists_p, Sfile_exists_p, 1, 1, 0, |
| 2628 | doc: /* Return t if file FILENAME exists (whether or not you can read it.) |
| 2629 | See also `file-readable-p' and `file-attributes'. |
| 2630 | This returns nil for a symlink to a nonexistent file. |
| 2631 | Use `file-symlink-p' to test for such links. */) |
| 2632 | (Lisp_Object filename) |
| 2633 | { |
| 2634 | Lisp_Object absname; |
| 2635 | Lisp_Object handler; |
| 2636 | |
| 2637 | CHECK_STRING (filename); |
| 2638 | absname = Fexpand_file_name (filename, Qnil); |
| 2639 | |
| 2640 | /* If the file name has special constructs in it, |
| 2641 | call the corresponding file handler. */ |
| 2642 | handler = Ffind_file_name_handler (absname, Qfile_exists_p); |
| 2643 | if (!NILP (handler)) |
| 2644 | return call2 (handler, Qfile_exists_p, absname); |
| 2645 | |
| 2646 | absname = ENCODE_FILE (absname); |
| 2647 | |
| 2648 | return (check_existing (SSDATA (absname))) ? Qt : Qnil; |
| 2649 | } |
| 2650 | |
| 2651 | DEFUN ("file-executable-p", Ffile_executable_p, Sfile_executable_p, 1, 1, 0, |
| 2652 | doc: /* Return t if FILENAME can be executed by you. |
| 2653 | For a directory, this means you can access files in that directory. */) |
| 2654 | (Lisp_Object filename) |
| 2655 | { |
| 2656 | Lisp_Object absname; |
| 2657 | Lisp_Object handler; |
| 2658 | |
| 2659 | CHECK_STRING (filename); |
| 2660 | absname = Fexpand_file_name (filename, Qnil); |
| 2661 | |
| 2662 | /* If the file name has special constructs in it, |
| 2663 | call the corresponding file handler. */ |
| 2664 | handler = Ffind_file_name_handler (absname, Qfile_executable_p); |
| 2665 | if (!NILP (handler)) |
| 2666 | return call2 (handler, Qfile_executable_p, absname); |
| 2667 | |
| 2668 | absname = ENCODE_FILE (absname); |
| 2669 | |
| 2670 | return (check_executable (SSDATA (absname)) ? Qt : Qnil); |
| 2671 | } |
| 2672 | |
| 2673 | DEFUN ("file-readable-p", Ffile_readable_p, Sfile_readable_p, 1, 1, 0, |
| 2674 | doc: /* Return t if file FILENAME exists and you can read it. |
| 2675 | See also `file-exists-p' and `file-attributes'. */) |
| 2676 | (Lisp_Object filename) |
| 2677 | { |
| 2678 | Lisp_Object absname; |
| 2679 | Lisp_Object handler; |
| 2680 | |
| 2681 | CHECK_STRING (filename); |
| 2682 | absname = Fexpand_file_name (filename, Qnil); |
| 2683 | |
| 2684 | /* If the file name has special constructs in it, |
| 2685 | call the corresponding file handler. */ |
| 2686 | handler = Ffind_file_name_handler (absname, Qfile_readable_p); |
| 2687 | if (!NILP (handler)) |
| 2688 | return call2 (handler, Qfile_readable_p, absname); |
| 2689 | |
| 2690 | absname = ENCODE_FILE (absname); |
| 2691 | return (faccessat (AT_FDCWD, SSDATA (absname), R_OK, AT_EACCESS) == 0 |
| 2692 | ? Qt : Qnil); |
| 2693 | } |
| 2694 | |
| 2695 | DEFUN ("file-writable-p", Ffile_writable_p, Sfile_writable_p, 1, 1, 0, |
| 2696 | doc: /* Return t if file FILENAME can be written or created by you. */) |
| 2697 | (Lisp_Object filename) |
| 2698 | { |
| 2699 | Lisp_Object absname, dir, encoded; |
| 2700 | Lisp_Object handler; |
| 2701 | |
| 2702 | CHECK_STRING (filename); |
| 2703 | absname = Fexpand_file_name (filename, Qnil); |
| 2704 | |
| 2705 | /* If the file name has special constructs in it, |
| 2706 | call the corresponding file handler. */ |
| 2707 | handler = Ffind_file_name_handler (absname, Qfile_writable_p); |
| 2708 | if (!NILP (handler)) |
| 2709 | return call2 (handler, Qfile_writable_p, absname); |
| 2710 | |
| 2711 | encoded = ENCODE_FILE (absname); |
| 2712 | if (check_writable (SSDATA (encoded), W_OK)) |
| 2713 | return Qt; |
| 2714 | if (errno != ENOENT) |
| 2715 | return Qnil; |
| 2716 | |
| 2717 | dir = Ffile_name_directory (absname); |
| 2718 | eassert (!NILP (dir)); |
| 2719 | #ifdef MSDOS |
| 2720 | dir = Fdirectory_file_name (dir); |
| 2721 | #endif /* MSDOS */ |
| 2722 | |
| 2723 | dir = ENCODE_FILE (dir); |
| 2724 | #ifdef WINDOWSNT |
| 2725 | /* The read-only attribute of the parent directory doesn't affect |
| 2726 | whether a file or directory can be created within it. Some day we |
| 2727 | should check ACLs though, which do affect this. */ |
| 2728 | return file_directory_p (SDATA (dir)) ? Qt : Qnil; |
| 2729 | #else |
| 2730 | return check_writable (SSDATA (dir), W_OK | X_OK) ? Qt : Qnil; |
| 2731 | #endif |
| 2732 | } |
| 2733 | \f |
| 2734 | DEFUN ("access-file", Faccess_file, Saccess_file, 2, 2, 0, |
| 2735 | doc: /* Access file FILENAME, and get an error if that does not work. |
| 2736 | The second argument STRING is used in the error message. |
| 2737 | If there is no error, returns nil. */) |
| 2738 | (Lisp_Object filename, Lisp_Object string) |
| 2739 | { |
| 2740 | Lisp_Object handler, encoded_filename, absname; |
| 2741 | int fd; |
| 2742 | |
| 2743 | CHECK_STRING (filename); |
| 2744 | absname = Fexpand_file_name (filename, Qnil); |
| 2745 | |
| 2746 | CHECK_STRING (string); |
| 2747 | |
| 2748 | /* If the file name has special constructs in it, |
| 2749 | call the corresponding file handler. */ |
| 2750 | handler = Ffind_file_name_handler (absname, Qaccess_file); |
| 2751 | if (!NILP (handler)) |
| 2752 | return call3 (handler, Qaccess_file, absname, string); |
| 2753 | |
| 2754 | encoded_filename = ENCODE_FILE (absname); |
| 2755 | |
| 2756 | fd = emacs_open (SSDATA (encoded_filename), O_RDONLY, 0); |
| 2757 | if (fd < 0) |
| 2758 | report_file_error (SSDATA (string), Fcons (filename, Qnil)); |
| 2759 | emacs_close (fd); |
| 2760 | |
| 2761 | return Qnil; |
| 2762 | } |
| 2763 | \f |
| 2764 | /* Relative to directory FD, return the symbolic link value of FILENAME. |
| 2765 | On failure, return nil. */ |
| 2766 | Lisp_Object |
| 2767 | emacs_readlinkat (int fd, char const *filename) |
| 2768 | { |
| 2769 | static struct allocator const emacs_norealloc_allocator = |
| 2770 | { xmalloc, NULL, xfree, memory_full }; |
| 2771 | Lisp_Object val; |
| 2772 | char readlink_buf[1024]; |
| 2773 | char *buf = careadlinkat (fd, filename, readlink_buf, sizeof readlink_buf, |
| 2774 | &emacs_norealloc_allocator, readlinkat); |
| 2775 | if (!buf) |
| 2776 | return Qnil; |
| 2777 | |
| 2778 | val = build_string (buf); |
| 2779 | if (buf[0] == '/' && strchr (buf, ':')) |
| 2780 | val = concat2 (build_string ("/:"), val); |
| 2781 | if (buf != readlink_buf) |
| 2782 | xfree (buf); |
| 2783 | val = DECODE_FILE (val); |
| 2784 | return val; |
| 2785 | } |
| 2786 | |
| 2787 | DEFUN ("file-symlink-p", Ffile_symlink_p, Sfile_symlink_p, 1, 1, 0, |
| 2788 | doc: /* Return non-nil if file FILENAME is the name of a symbolic link. |
| 2789 | The value is the link target, as a string. |
| 2790 | Otherwise it returns nil. |
| 2791 | |
| 2792 | This function returns t when given the name of a symlink that |
| 2793 | points to a nonexistent file. */) |
| 2794 | (Lisp_Object filename) |
| 2795 | { |
| 2796 | Lisp_Object handler; |
| 2797 | |
| 2798 | CHECK_STRING (filename); |
| 2799 | filename = Fexpand_file_name (filename, Qnil); |
| 2800 | |
| 2801 | /* If the file name has special constructs in it, |
| 2802 | call the corresponding file handler. */ |
| 2803 | handler = Ffind_file_name_handler (filename, Qfile_symlink_p); |
| 2804 | if (!NILP (handler)) |
| 2805 | return call2 (handler, Qfile_symlink_p, filename); |
| 2806 | |
| 2807 | filename = ENCODE_FILE (filename); |
| 2808 | |
| 2809 | return emacs_readlinkat (AT_FDCWD, SSDATA (filename)); |
| 2810 | } |
| 2811 | |
| 2812 | DEFUN ("file-directory-p", Ffile_directory_p, Sfile_directory_p, 1, 1, 0, |
| 2813 | doc: /* Return t if FILENAME names an existing directory. |
| 2814 | Symbolic links to directories count as directories. |
| 2815 | See `file-symlink-p' to distinguish symlinks. */) |
| 2816 | (Lisp_Object filename) |
| 2817 | { |
| 2818 | Lisp_Object absname; |
| 2819 | Lisp_Object handler; |
| 2820 | |
| 2821 | absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory)); |
| 2822 | |
| 2823 | /* If the file name has special constructs in it, |
| 2824 | call the corresponding file handler. */ |
| 2825 | handler = Ffind_file_name_handler (absname, Qfile_directory_p); |
| 2826 | if (!NILP (handler)) |
| 2827 | return call2 (handler, Qfile_directory_p, absname); |
| 2828 | |
| 2829 | absname = ENCODE_FILE (absname); |
| 2830 | |
| 2831 | return file_directory_p (SSDATA (absname)) ? Qt : Qnil; |
| 2832 | } |
| 2833 | |
| 2834 | /* Return true if FILE is a directory or a symlink to a directory. */ |
| 2835 | bool |
| 2836 | file_directory_p (char const *file) |
| 2837 | { |
| 2838 | #ifdef WINDOWSNT |
| 2839 | /* This is cheaper than 'stat'. */ |
| 2840 | return faccessat (AT_FDCWD, file, D_OK, AT_EACCESS) == 0; |
| 2841 | #else |
| 2842 | struct stat st; |
| 2843 | return stat (file, &st) == 0 && S_ISDIR (st.st_mode); |
| 2844 | #endif |
| 2845 | } |
| 2846 | |
| 2847 | DEFUN ("file-accessible-directory-p", Ffile_accessible_directory_p, |
| 2848 | Sfile_accessible_directory_p, 1, 1, 0, |
| 2849 | doc: /* Return t if file FILENAME names a directory you can open. |
| 2850 | For the value to be t, FILENAME must specify the name of a directory as a file, |
| 2851 | and the directory must allow you to open files in it. In order to use a |
| 2852 | directory as a buffer's current directory, this predicate must return true. |
| 2853 | A directory name spec may be given instead; then the value is t |
| 2854 | if the directory so specified exists and really is a readable and |
| 2855 | searchable directory. */) |
| 2856 | (Lisp_Object filename) |
| 2857 | { |
| 2858 | Lisp_Object absname; |
| 2859 | Lisp_Object handler; |
| 2860 | |
| 2861 | CHECK_STRING (filename); |
| 2862 | absname = Fexpand_file_name (filename, Qnil); |
| 2863 | |
| 2864 | /* If the file name has special constructs in it, |
| 2865 | call the corresponding file handler. */ |
| 2866 | handler = Ffind_file_name_handler (absname, Qfile_accessible_directory_p); |
| 2867 | if (!NILP (handler)) |
| 2868 | return call2 (handler, Qfile_accessible_directory_p, absname); |
| 2869 | |
| 2870 | absname = ENCODE_FILE (absname); |
| 2871 | return file_accessible_directory_p (SSDATA (absname)) ? Qt : Qnil; |
| 2872 | } |
| 2873 | |
| 2874 | /* If FILE is a searchable directory or a symlink to a |
| 2875 | searchable directory, return true. Otherwise return |
| 2876 | false and set errno to an error number. */ |
| 2877 | bool |
| 2878 | file_accessible_directory_p (char const *file) |
| 2879 | { |
| 2880 | #ifdef DOS_NT |
| 2881 | /* There's no need to test whether FILE is searchable, as the |
| 2882 | searchable/executable bit is invented on DOS_NT platforms. */ |
| 2883 | return file_directory_p (file); |
| 2884 | #else |
| 2885 | /* On POSIXish platforms, use just one system call; this avoids a |
| 2886 | race and is typically faster. */ |
| 2887 | ptrdiff_t len = strlen (file); |
| 2888 | char const *dir; |
| 2889 | bool ok; |
| 2890 | int saved_errno; |
| 2891 | USE_SAFE_ALLOCA; |
| 2892 | |
| 2893 | /* Normally a file "FOO" is an accessible directory if "FOO/." exists. |
| 2894 | There are three exceptions: "", "/", and "//". Leave "" alone, |
| 2895 | as it's invalid. Append only "." to the other two exceptions as |
| 2896 | "/" and "//" are distinct on some platforms, whereas "/", "///", |
| 2897 | "////", etc. are all equivalent. */ |
| 2898 | if (! len) |
| 2899 | dir = file; |
| 2900 | else |
| 2901 | { |
| 2902 | /* Just check for trailing '/' when deciding whether to append '/'. |
| 2903 | That's simpler than testing the two special cases "/" and "//", |
| 2904 | and it's a safe optimization here. */ |
| 2905 | char *buf = SAFE_ALLOCA (len + 3); |
| 2906 | memcpy (buf, file, len); |
| 2907 | strcpy (buf + len, "/." + (file[len - 1] == '/')); |
| 2908 | dir = buf; |
| 2909 | } |
| 2910 | |
| 2911 | ok = check_existing (dir); |
| 2912 | saved_errno = errno; |
| 2913 | SAFE_FREE (); |
| 2914 | errno = saved_errno; |
| 2915 | return ok; |
| 2916 | #endif |
| 2917 | } |
| 2918 | |
| 2919 | DEFUN ("file-regular-p", Ffile_regular_p, Sfile_regular_p, 1, 1, 0, |
| 2920 | doc: /* Return t if FILENAME names a regular file. |
| 2921 | This is the sort of file that holds an ordinary stream of data bytes. |
| 2922 | Symbolic links to regular files count as regular files. |
| 2923 | See `file-symlink-p' to distinguish symlinks. */) |
| 2924 | (Lisp_Object filename) |
| 2925 | { |
| 2926 | register Lisp_Object absname; |
| 2927 | struct stat st; |
| 2928 | Lisp_Object handler; |
| 2929 | |
| 2930 | absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory)); |
| 2931 | |
| 2932 | /* If the file name has special constructs in it, |
| 2933 | call the corresponding file handler. */ |
| 2934 | handler = Ffind_file_name_handler (absname, Qfile_regular_p); |
| 2935 | if (!NILP (handler)) |
| 2936 | return call2 (handler, Qfile_regular_p, absname); |
| 2937 | |
| 2938 | absname = ENCODE_FILE (absname); |
| 2939 | |
| 2940 | #ifdef WINDOWSNT |
| 2941 | { |
| 2942 | int result; |
| 2943 | Lisp_Object tem = Vw32_get_true_file_attributes; |
| 2944 | |
| 2945 | /* Tell stat to use expensive method to get accurate info. */ |
| 2946 | Vw32_get_true_file_attributes = Qt; |
| 2947 | result = stat (SDATA (absname), &st); |
| 2948 | Vw32_get_true_file_attributes = tem; |
| 2949 | |
| 2950 | if (result < 0) |
| 2951 | return Qnil; |
| 2952 | return S_ISREG (st.st_mode) ? Qt : Qnil; |
| 2953 | } |
| 2954 | #else |
| 2955 | if (stat (SSDATA (absname), &st) < 0) |
| 2956 | return Qnil; |
| 2957 | return S_ISREG (st.st_mode) ? Qt : Qnil; |
| 2958 | #endif |
| 2959 | } |
| 2960 | \f |
| 2961 | DEFUN ("file-selinux-context", Ffile_selinux_context, |
| 2962 | Sfile_selinux_context, 1, 1, 0, |
| 2963 | doc: /* Return SELinux context of file named FILENAME. |
| 2964 | The return value is a list (USER ROLE TYPE RANGE), where the list |
| 2965 | elements are strings naming the user, role, type, and range of the |
| 2966 | file's SELinux security context. |
| 2967 | |
| 2968 | Return (nil nil nil nil) if the file is nonexistent or inaccessible, |
| 2969 | or if SELinux is disabled, or if Emacs lacks SELinux support. */) |
| 2970 | (Lisp_Object filename) |
| 2971 | { |
| 2972 | Lisp_Object absname; |
| 2973 | Lisp_Object values[4]; |
| 2974 | Lisp_Object handler; |
| 2975 | #if HAVE_LIBSELINUX |
| 2976 | security_context_t con; |
| 2977 | int conlength; |
| 2978 | context_t context; |
| 2979 | #endif |
| 2980 | |
| 2981 | absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory)); |
| 2982 | |
| 2983 | /* If the file name has special constructs in it, |
| 2984 | call the corresponding file handler. */ |
| 2985 | handler = Ffind_file_name_handler (absname, Qfile_selinux_context); |
| 2986 | if (!NILP (handler)) |
| 2987 | return call2 (handler, Qfile_selinux_context, absname); |
| 2988 | |
| 2989 | absname = ENCODE_FILE (absname); |
| 2990 | |
| 2991 | values[0] = Qnil; |
| 2992 | values[1] = Qnil; |
| 2993 | values[2] = Qnil; |
| 2994 | values[3] = Qnil; |
| 2995 | #if HAVE_LIBSELINUX |
| 2996 | if (is_selinux_enabled ()) |
| 2997 | { |
| 2998 | conlength = lgetfilecon (SSDATA (absname), &con); |
| 2999 | if (conlength > 0) |
| 3000 | { |
| 3001 | context = context_new (con); |
| 3002 | if (context_user_get (context)) |
| 3003 | values[0] = build_string (context_user_get (context)); |
| 3004 | if (context_role_get (context)) |
| 3005 | values[1] = build_string (context_role_get (context)); |
| 3006 | if (context_type_get (context)) |
| 3007 | values[2] = build_string (context_type_get (context)); |
| 3008 | if (context_range_get (context)) |
| 3009 | values[3] = build_string (context_range_get (context)); |
| 3010 | context_free (context); |
| 3011 | freecon (con); |
| 3012 | } |
| 3013 | } |
| 3014 | #endif |
| 3015 | |
| 3016 | return Flist (sizeof (values) / sizeof (values[0]), values); |
| 3017 | } |
| 3018 | \f |
| 3019 | DEFUN ("set-file-selinux-context", Fset_file_selinux_context, |
| 3020 | Sset_file_selinux_context, 2, 2, 0, |
| 3021 | doc: /* Set SELinux context of file named FILENAME to CONTEXT. |
| 3022 | CONTEXT should be a list (USER ROLE TYPE RANGE), where the list |
| 3023 | elements are strings naming the components of a SELinux context. |
| 3024 | |
| 3025 | Value is t if setting of SELinux context was successful, nil otherwise. |
| 3026 | |
| 3027 | This function does nothing and returns nil if SELinux is disabled, |
| 3028 | or if Emacs was not compiled with SELinux support. */) |
| 3029 | (Lisp_Object filename, Lisp_Object context) |
| 3030 | { |
| 3031 | Lisp_Object absname; |
| 3032 | Lisp_Object handler; |
| 3033 | #if HAVE_LIBSELINUX |
| 3034 | Lisp_Object encoded_absname; |
| 3035 | Lisp_Object user = CAR_SAFE (context); |
| 3036 | Lisp_Object role = CAR_SAFE (CDR_SAFE (context)); |
| 3037 | Lisp_Object type = CAR_SAFE (CDR_SAFE (CDR_SAFE (context))); |
| 3038 | Lisp_Object range = CAR_SAFE (CDR_SAFE (CDR_SAFE (CDR_SAFE (context)))); |
| 3039 | security_context_t con; |
| 3040 | bool fail; |
| 3041 | int conlength; |
| 3042 | context_t parsed_con; |
| 3043 | #endif |
| 3044 | |
| 3045 | absname = Fexpand_file_name (filename, BVAR (current_buffer, directory)); |
| 3046 | |
| 3047 | /* If the file name has special constructs in it, |
| 3048 | call the corresponding file handler. */ |
| 3049 | handler = Ffind_file_name_handler (absname, Qset_file_selinux_context); |
| 3050 | if (!NILP (handler)) |
| 3051 | return call3 (handler, Qset_file_selinux_context, absname, context); |
| 3052 | |
| 3053 | #if HAVE_LIBSELINUX |
| 3054 | if (is_selinux_enabled ()) |
| 3055 | { |
| 3056 | /* Get current file context. */ |
| 3057 | encoded_absname = ENCODE_FILE (absname); |
| 3058 | conlength = lgetfilecon (SSDATA (encoded_absname), &con); |
| 3059 | if (conlength > 0) |
| 3060 | { |
| 3061 | parsed_con = context_new (con); |
| 3062 | /* Change the parts defined in the parameter.*/ |
| 3063 | if (STRINGP (user)) |
| 3064 | { |
| 3065 | if (context_user_set (parsed_con, SSDATA (user))) |
| 3066 | error ("Doing context_user_set"); |
| 3067 | } |
| 3068 | if (STRINGP (role)) |
| 3069 | { |
| 3070 | if (context_role_set (parsed_con, SSDATA (role))) |
| 3071 | error ("Doing context_role_set"); |
| 3072 | } |
| 3073 | if (STRINGP (type)) |
| 3074 | { |
| 3075 | if (context_type_set (parsed_con, SSDATA (type))) |
| 3076 | error ("Doing context_type_set"); |
| 3077 | } |
| 3078 | if (STRINGP (range)) |
| 3079 | { |
| 3080 | if (context_range_set (parsed_con, SSDATA (range))) |
| 3081 | error ("Doing context_range_set"); |
| 3082 | } |
| 3083 | |
| 3084 | /* Set the modified context back to the file. */ |
| 3085 | fail = (lsetfilecon (SSDATA (encoded_absname), |
| 3086 | context_str (parsed_con)) |
| 3087 | != 0); |
| 3088 | /* See http://debbugs.gnu.org/11245 for ENOTSUP. */ |
| 3089 | if (fail && errno != ENOTSUP) |
| 3090 | report_file_error ("Doing lsetfilecon", Fcons (absname, Qnil)); |
| 3091 | |
| 3092 | context_free (parsed_con); |
| 3093 | freecon (con); |
| 3094 | return fail ? Qnil : Qt; |
| 3095 | } |
| 3096 | else |
| 3097 | report_file_error ("Doing lgetfilecon", Fcons (absname, Qnil)); |
| 3098 | } |
| 3099 | #endif |
| 3100 | |
| 3101 | return Qnil; |
| 3102 | } |
| 3103 | \f |
| 3104 | DEFUN ("file-acl", Ffile_acl, Sfile_acl, 1, 1, 0, |
| 3105 | doc: /* Return ACL entries of file named FILENAME. |
| 3106 | The entries are returned in a format suitable for use in `set-file-acl' |
| 3107 | but is otherwise undocumented and subject to change. |
| 3108 | Return nil if file does not exist or is not accessible, or if Emacs |
| 3109 | was unable to determine the ACL entries. */) |
| 3110 | (Lisp_Object filename) |
| 3111 | { |
| 3112 | Lisp_Object absname; |
| 3113 | Lisp_Object handler; |
| 3114 | #ifdef HAVE_POSIX_ACL |
| 3115 | acl_t acl; |
| 3116 | Lisp_Object acl_string; |
| 3117 | char *str; |
| 3118 | #endif |
| 3119 | |
| 3120 | absname = expand_and_dir_to_file (filename, |
| 3121 | BVAR (current_buffer, directory)); |
| 3122 | |
| 3123 | /* If the file name has special constructs in it, |
| 3124 | call the corresponding file handler. */ |
| 3125 | handler = Ffind_file_name_handler (absname, Qfile_acl); |
| 3126 | if (!NILP (handler)) |
| 3127 | return call2 (handler, Qfile_acl, absname); |
| 3128 | |
| 3129 | #ifdef HAVE_POSIX_ACL |
| 3130 | absname = ENCODE_FILE (absname); |
| 3131 | |
| 3132 | acl = acl_get_file (SSDATA (absname), ACL_TYPE_ACCESS); |
| 3133 | if (acl == NULL) |
| 3134 | return Qnil; |
| 3135 | |
| 3136 | str = acl_to_text (acl, NULL); |
| 3137 | if (str == NULL) |
| 3138 | { |
| 3139 | acl_free (acl); |
| 3140 | return Qnil; |
| 3141 | } |
| 3142 | |
| 3143 | acl_string = build_string (str); |
| 3144 | acl_free (str); |
| 3145 | acl_free (acl); |
| 3146 | |
| 3147 | return acl_string; |
| 3148 | #endif |
| 3149 | |
| 3150 | return Qnil; |
| 3151 | } |
| 3152 | |
| 3153 | DEFUN ("set-file-acl", Fset_file_acl, Sset_file_acl, |
| 3154 | 2, 2, 0, |
| 3155 | doc: /* Set ACL of file named FILENAME to ACL-STRING. |
| 3156 | ACL-STRING should contain the textual representation of the ACL |
| 3157 | entries in a format suitable for the platform. |
| 3158 | |
| 3159 | Value is t if setting of ACL was successful, nil otherwise. |
| 3160 | |
| 3161 | Setting ACL for local files requires Emacs to be built with ACL |
| 3162 | support. */) |
| 3163 | (Lisp_Object filename, Lisp_Object acl_string) |
| 3164 | { |
| 3165 | Lisp_Object absname; |
| 3166 | Lisp_Object handler; |
| 3167 | #ifdef HAVE_POSIX_ACL |
| 3168 | Lisp_Object encoded_absname; |
| 3169 | acl_t acl; |
| 3170 | bool fail; |
| 3171 | #endif |
| 3172 | |
| 3173 | absname = Fexpand_file_name (filename, BVAR (current_buffer, directory)); |
| 3174 | |
| 3175 | /* If the file name has special constructs in it, |
| 3176 | call the corresponding file handler. */ |
| 3177 | handler = Ffind_file_name_handler (absname, Qset_file_acl); |
| 3178 | if (!NILP (handler)) |
| 3179 | return call3 (handler, Qset_file_acl, absname, acl_string); |
| 3180 | |
| 3181 | #ifdef HAVE_POSIX_ACL |
| 3182 | if (STRINGP (acl_string)) |
| 3183 | { |
| 3184 | acl = acl_from_text (SSDATA (acl_string)); |
| 3185 | if (acl == NULL) |
| 3186 | { |
| 3187 | report_file_error ("Converting ACL", Fcons (absname, Qnil)); |
| 3188 | return Qnil; |
| 3189 | } |
| 3190 | |
| 3191 | encoded_absname = ENCODE_FILE (absname); |
| 3192 | |
| 3193 | fail = (acl_set_file (SSDATA (encoded_absname), ACL_TYPE_ACCESS, |
| 3194 | acl) |
| 3195 | != 0); |
| 3196 | if (fail && errno != ENOTSUP) |
| 3197 | report_file_error ("Setting ACL", Fcons (absname, Qnil)); |
| 3198 | |
| 3199 | acl_free (acl); |
| 3200 | return fail ? Qnil : Qt; |
| 3201 | } |
| 3202 | #endif |
| 3203 | |
| 3204 | return Qnil; |
| 3205 | } |
| 3206 | \f |
| 3207 | DEFUN ("file-modes", Ffile_modes, Sfile_modes, 1, 1, 0, |
| 3208 | doc: /* Return mode bits of file named FILENAME, as an integer. |
| 3209 | Return nil, if file does not exist or is not accessible. */) |
| 3210 | (Lisp_Object filename) |
| 3211 | { |
| 3212 | Lisp_Object absname; |
| 3213 | struct stat st; |
| 3214 | Lisp_Object handler; |
| 3215 | |
| 3216 | absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory)); |
| 3217 | |
| 3218 | /* If the file name has special constructs in it, |
| 3219 | call the corresponding file handler. */ |
| 3220 | handler = Ffind_file_name_handler (absname, Qfile_modes); |
| 3221 | if (!NILP (handler)) |
| 3222 | return call2 (handler, Qfile_modes, absname); |
| 3223 | |
| 3224 | absname = ENCODE_FILE (absname); |
| 3225 | |
| 3226 | if (stat (SSDATA (absname), &st) < 0) |
| 3227 | return Qnil; |
| 3228 | |
| 3229 | return make_number (st.st_mode & 07777); |
| 3230 | } |
| 3231 | |
| 3232 | DEFUN ("set-file-modes", Fset_file_modes, Sset_file_modes, 2, 2, |
| 3233 | "(let ((file (read-file-name \"File: \"))) \ |
| 3234 | (list file (read-file-modes nil file)))", |
| 3235 | doc: /* Set mode bits of file named FILENAME to MODE (an integer). |
| 3236 | Only the 12 low bits of MODE are used. |
| 3237 | |
| 3238 | Interactively, mode bits are read by `read-file-modes', which accepts |
| 3239 | symbolic notation, like the `chmod' command from GNU Coreutils. */) |
| 3240 | (Lisp_Object filename, Lisp_Object mode) |
| 3241 | { |
| 3242 | Lisp_Object absname, encoded_absname; |
| 3243 | Lisp_Object handler; |
| 3244 | |
| 3245 | absname = Fexpand_file_name (filename, BVAR (current_buffer, directory)); |
| 3246 | CHECK_NUMBER (mode); |
| 3247 | |
| 3248 | /* If the file name has special constructs in it, |
| 3249 | call the corresponding file handler. */ |
| 3250 | handler = Ffind_file_name_handler (absname, Qset_file_modes); |
| 3251 | if (!NILP (handler)) |
| 3252 | return call3 (handler, Qset_file_modes, absname, mode); |
| 3253 | |
| 3254 | encoded_absname = ENCODE_FILE (absname); |
| 3255 | |
| 3256 | if (chmod (SSDATA (encoded_absname), XINT (mode) & 07777) < 0) |
| 3257 | report_file_error ("Doing chmod", Fcons (absname, Qnil)); |
| 3258 | |
| 3259 | return Qnil; |
| 3260 | } |
| 3261 | |
| 3262 | DEFUN ("set-default-file-modes", Fset_default_file_modes, Sset_default_file_modes, 1, 1, 0, |
| 3263 | doc: /* Set the file permission bits for newly created files. |
| 3264 | The argument MODE should be an integer; only the low 9 bits are used. |
| 3265 | This setting is inherited by subprocesses. */) |
| 3266 | (Lisp_Object mode) |
| 3267 | { |
| 3268 | CHECK_NUMBER (mode); |
| 3269 | |
| 3270 | umask ((~ XINT (mode)) & 0777); |
| 3271 | |
| 3272 | return Qnil; |
| 3273 | } |
| 3274 | |
| 3275 | DEFUN ("default-file-modes", Fdefault_file_modes, Sdefault_file_modes, 0, 0, 0, |
| 3276 | doc: /* Return the default file protection for created files. |
| 3277 | The value is an integer. */) |
| 3278 | (void) |
| 3279 | { |
| 3280 | mode_t realmask; |
| 3281 | Lisp_Object value; |
| 3282 | |
| 3283 | block_input (); |
| 3284 | realmask = umask (0); |
| 3285 | umask (realmask); |
| 3286 | unblock_input (); |
| 3287 | |
| 3288 | XSETINT (value, (~ realmask) & 0777); |
| 3289 | return value; |
| 3290 | } |
| 3291 | \f |
| 3292 | |
| 3293 | DEFUN ("set-file-times", Fset_file_times, Sset_file_times, 1, 2, 0, |
| 3294 | doc: /* Set times of file FILENAME to TIMESTAMP. |
| 3295 | Set both access and modification times. |
| 3296 | Return t on success, else nil. |
| 3297 | Use the current time if TIMESTAMP is nil. TIMESTAMP is in the format of |
| 3298 | `current-time'. */) |
| 3299 | (Lisp_Object filename, Lisp_Object timestamp) |
| 3300 | { |
| 3301 | Lisp_Object absname, encoded_absname; |
| 3302 | Lisp_Object handler; |
| 3303 | EMACS_TIME t = lisp_time_argument (timestamp); |
| 3304 | |
| 3305 | absname = Fexpand_file_name (filename, BVAR (current_buffer, directory)); |
| 3306 | |
| 3307 | /* If the file name has special constructs in it, |
| 3308 | call the corresponding file handler. */ |
| 3309 | handler = Ffind_file_name_handler (absname, Qset_file_times); |
| 3310 | if (!NILP (handler)) |
| 3311 | return call3 (handler, Qset_file_times, absname, timestamp); |
| 3312 | |
| 3313 | encoded_absname = ENCODE_FILE (absname); |
| 3314 | |
| 3315 | { |
| 3316 | if (set_file_times (-1, SSDATA (encoded_absname), t, t)) |
| 3317 | { |
| 3318 | #ifdef MSDOS |
| 3319 | /* Setting times on a directory always fails. */ |
| 3320 | if (file_directory_p (SSDATA (encoded_absname))) |
| 3321 | return Qnil; |
| 3322 | #endif |
| 3323 | report_file_error ("Setting file times", Fcons (absname, Qnil)); |
| 3324 | return Qnil; |
| 3325 | } |
| 3326 | } |
| 3327 | |
| 3328 | return Qt; |
| 3329 | } |
| 3330 | \f |
| 3331 | #ifdef HAVE_SYNC |
| 3332 | DEFUN ("unix-sync", Funix_sync, Sunix_sync, 0, 0, "", |
| 3333 | doc: /* Tell Unix to finish all pending disk updates. */) |
| 3334 | (void) |
| 3335 | { |
| 3336 | sync (); |
| 3337 | return Qnil; |
| 3338 | } |
| 3339 | |
| 3340 | #endif /* HAVE_SYNC */ |
| 3341 | |
| 3342 | DEFUN ("file-newer-than-file-p", Ffile_newer_than_file_p, Sfile_newer_than_file_p, 2, 2, 0, |
| 3343 | doc: /* Return t if file FILE1 is newer than file FILE2. |
| 3344 | If FILE1 does not exist, the answer is nil; |
| 3345 | otherwise, if FILE2 does not exist, the answer is t. */) |
| 3346 | (Lisp_Object file1, Lisp_Object file2) |
| 3347 | { |
| 3348 | Lisp_Object absname1, absname2; |
| 3349 | struct stat st1, st2; |
| 3350 | Lisp_Object handler; |
| 3351 | struct gcpro gcpro1, gcpro2; |
| 3352 | |
| 3353 | CHECK_STRING (file1); |
| 3354 | CHECK_STRING (file2); |
| 3355 | |
| 3356 | absname1 = Qnil; |
| 3357 | GCPRO2 (absname1, file2); |
| 3358 | absname1 = expand_and_dir_to_file (file1, BVAR (current_buffer, directory)); |
| 3359 | absname2 = expand_and_dir_to_file (file2, BVAR (current_buffer, directory)); |
| 3360 | UNGCPRO; |
| 3361 | |
| 3362 | /* If the file name has special constructs in it, |
| 3363 | call the corresponding file handler. */ |
| 3364 | handler = Ffind_file_name_handler (absname1, Qfile_newer_than_file_p); |
| 3365 | if (NILP (handler)) |
| 3366 | handler = Ffind_file_name_handler (absname2, Qfile_newer_than_file_p); |
| 3367 | if (!NILP (handler)) |
| 3368 | return call3 (handler, Qfile_newer_than_file_p, absname1, absname2); |
| 3369 | |
| 3370 | GCPRO2 (absname1, absname2); |
| 3371 | absname1 = ENCODE_FILE (absname1); |
| 3372 | absname2 = ENCODE_FILE (absname2); |
| 3373 | UNGCPRO; |
| 3374 | |
| 3375 | if (stat (SSDATA (absname1), &st1) < 0) |
| 3376 | return Qnil; |
| 3377 | |
| 3378 | if (stat (SSDATA (absname2), &st2) < 0) |
| 3379 | return Qt; |
| 3380 | |
| 3381 | return (EMACS_TIME_GT (get_stat_mtime (&st1), get_stat_mtime (&st2)) |
| 3382 | ? Qt : Qnil); |
| 3383 | } |
| 3384 | \f |
| 3385 | #ifndef READ_BUF_SIZE |
| 3386 | #define READ_BUF_SIZE (64 << 10) |
| 3387 | #endif |
| 3388 | /* Some buffer offsets are stored in 'int' variables. */ |
| 3389 | verify (READ_BUF_SIZE <= INT_MAX); |
| 3390 | |
| 3391 | /* This function is called after Lisp functions to decide a coding |
| 3392 | system are called, or when they cause an error. Before they are |
| 3393 | called, the current buffer is set unibyte and it contains only a |
| 3394 | newly inserted text (thus the buffer was empty before the |
| 3395 | insertion). |
| 3396 | |
| 3397 | The functions may set markers, overlays, text properties, or even |
| 3398 | alter the buffer contents, change the current buffer. |
| 3399 | |
| 3400 | Here, we reset all those changes by: |
| 3401 | o set back the current buffer. |
| 3402 | o move all markers and overlays to BEG. |
| 3403 | o remove all text properties. |
| 3404 | o set back the buffer multibyteness. */ |
| 3405 | |
| 3406 | static Lisp_Object |
| 3407 | decide_coding_unwind (Lisp_Object unwind_data) |
| 3408 | { |
| 3409 | Lisp_Object multibyte, undo_list, buffer; |
| 3410 | |
| 3411 | multibyte = XCAR (unwind_data); |
| 3412 | unwind_data = XCDR (unwind_data); |
| 3413 | undo_list = XCAR (unwind_data); |
| 3414 | buffer = XCDR (unwind_data); |
| 3415 | |
| 3416 | set_buffer_internal (XBUFFER (buffer)); |
| 3417 | adjust_markers_for_delete (BEG, BEG_BYTE, Z, Z_BYTE); |
| 3418 | adjust_overlays_for_delete (BEG, Z - BEG); |
| 3419 | set_buffer_intervals (current_buffer, NULL); |
| 3420 | TEMP_SET_PT_BOTH (BEG, BEG_BYTE); |
| 3421 | |
| 3422 | /* Now we are safe to change the buffer's multibyteness directly. */ |
| 3423 | bset_enable_multibyte_characters (current_buffer, multibyte); |
| 3424 | bset_undo_list (current_buffer, undo_list); |
| 3425 | |
| 3426 | return Qnil; |
| 3427 | } |
| 3428 | |
| 3429 | /* Read from a non-regular file. STATE is a Lisp_Save_Value |
| 3430 | object where slot 0 is the file descriptor, slot 1 specifies |
| 3431 | an offset to put the read bytes, and slot 2 is the maximum |
| 3432 | amount of bytes to read. Value is the number of bytes read. */ |
| 3433 | |
| 3434 | static Lisp_Object |
| 3435 | read_non_regular (Lisp_Object state) |
| 3436 | { |
| 3437 | int nbytes; |
| 3438 | |
| 3439 | immediate_quit = 1; |
| 3440 | QUIT; |
| 3441 | nbytes = emacs_read (XSAVE_INTEGER (state, 0), |
| 3442 | ((char *) BEG_ADDR + PT_BYTE - BEG_BYTE |
| 3443 | + XSAVE_INTEGER (state, 1)), |
| 3444 | XSAVE_INTEGER (state, 2)); |
| 3445 | immediate_quit = 0; |
| 3446 | /* Fast recycle this object for the likely next call. */ |
| 3447 | free_misc (state); |
| 3448 | return make_number (nbytes); |
| 3449 | } |
| 3450 | |
| 3451 | |
| 3452 | /* Condition-case handler used when reading from non-regular files |
| 3453 | in insert-file-contents. */ |
| 3454 | |
| 3455 | static Lisp_Object |
| 3456 | read_non_regular_quit (Lisp_Object ignore) |
| 3457 | { |
| 3458 | return Qnil; |
| 3459 | } |
| 3460 | |
| 3461 | /* Return the file offset that VAL represents, checking for type |
| 3462 | errors and overflow. */ |
| 3463 | static off_t |
| 3464 | file_offset (Lisp_Object val) |
| 3465 | { |
| 3466 | if (RANGED_INTEGERP (0, val, TYPE_MAXIMUM (off_t))) |
| 3467 | return XINT (val); |
| 3468 | |
| 3469 | if (FLOATP (val)) |
| 3470 | { |
| 3471 | double v = XFLOAT_DATA (val); |
| 3472 | if (0 <= v |
| 3473 | && (sizeof (off_t) < sizeof v |
| 3474 | ? v <= TYPE_MAXIMUM (off_t) |
| 3475 | : v < TYPE_MAXIMUM (off_t))) |
| 3476 | return v; |
| 3477 | } |
| 3478 | |
| 3479 | wrong_type_argument (intern ("file-offset"), val); |
| 3480 | } |
| 3481 | |
| 3482 | /* Return a special time value indicating the error number ERRNUM. */ |
| 3483 | static EMACS_TIME |
| 3484 | time_error_value (int errnum) |
| 3485 | { |
| 3486 | int ns = (errnum == ENOENT || errnum == EACCES || errnum == ENOTDIR |
| 3487 | ? NONEXISTENT_MODTIME_NSECS |
| 3488 | : UNKNOWN_MODTIME_NSECS); |
| 3489 | return make_emacs_time (0, ns); |
| 3490 | } |
| 3491 | |
| 3492 | DEFUN ("insert-file-contents", Finsert_file_contents, Sinsert_file_contents, |
| 3493 | 1, 5, 0, |
| 3494 | doc: /* Insert contents of file FILENAME after point. |
| 3495 | Returns list of absolute file name and number of characters inserted. |
| 3496 | If second argument VISIT is non-nil, the buffer's visited filename and |
| 3497 | last save file modtime are set, and it is marked unmodified. If |
| 3498 | visiting and the file does not exist, visiting is completed before the |
| 3499 | error is signaled. |
| 3500 | |
| 3501 | The optional third and fourth arguments BEG and END specify what portion |
| 3502 | of the file to insert. These arguments count bytes in the file, not |
| 3503 | characters in the buffer. If VISIT is non-nil, BEG and END must be nil. |
| 3504 | |
| 3505 | If optional fifth argument REPLACE is non-nil, replace the current |
| 3506 | buffer contents (in the accessible portion) with the file contents. |
| 3507 | This is better than simply deleting and inserting the whole thing |
| 3508 | because (1) it preserves some marker positions and (2) it puts less data |
| 3509 | in the undo list. When REPLACE is non-nil, the second return value is |
| 3510 | the number of characters that replace previous buffer contents. |
| 3511 | |
| 3512 | This function does code conversion according to the value of |
| 3513 | `coding-system-for-read' or `file-coding-system-alist', and sets the |
| 3514 | variable `last-coding-system-used' to the coding system actually used. |
| 3515 | |
| 3516 | In addition, this function decodes the inserted text from known formats |
| 3517 | by calling `format-decode', which see. */) |
| 3518 | (Lisp_Object filename, Lisp_Object visit, Lisp_Object beg, Lisp_Object end, Lisp_Object replace) |
| 3519 | { |
| 3520 | struct stat st; |
| 3521 | EMACS_TIME mtime; |
| 3522 | int fd; |
| 3523 | ptrdiff_t inserted = 0; |
| 3524 | bool nochange = 0; |
| 3525 | ptrdiff_t how_much; |
| 3526 | off_t beg_offset, end_offset; |
| 3527 | int unprocessed; |
| 3528 | ptrdiff_t count = SPECPDL_INDEX (); |
| 3529 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5; |
| 3530 | Lisp_Object handler, val, insval, orig_filename, old_undo; |
| 3531 | Lisp_Object p; |
| 3532 | ptrdiff_t total = 0; |
| 3533 | bool not_regular = 0; |
| 3534 | int save_errno = 0; |
| 3535 | char read_buf[READ_BUF_SIZE]; |
| 3536 | struct coding_system coding; |
| 3537 | bool replace_handled = 0; |
| 3538 | bool set_coding_system = 0; |
| 3539 | Lisp_Object coding_system; |
| 3540 | bool read_quit = 0; |
| 3541 | Lisp_Object old_Vdeactivate_mark = Vdeactivate_mark; |
| 3542 | bool we_locked_file = 0; |
| 3543 | bool deferred_remove_unwind_protect = 0; |
| 3544 | |
| 3545 | if (current_buffer->base_buffer && ! NILP (visit)) |
| 3546 | error ("Cannot do file visiting in an indirect buffer"); |
| 3547 | |
| 3548 | if (!NILP (BVAR (current_buffer, read_only))) |
| 3549 | Fbarf_if_buffer_read_only (); |
| 3550 | |
| 3551 | val = Qnil; |
| 3552 | p = Qnil; |
| 3553 | orig_filename = Qnil; |
| 3554 | old_undo = Qnil; |
| 3555 | |
| 3556 | GCPRO5 (filename, val, p, orig_filename, old_undo); |
| 3557 | |
| 3558 | CHECK_STRING (filename); |
| 3559 | filename = Fexpand_file_name (filename, Qnil); |
| 3560 | |
| 3561 | /* The value Qnil means that the coding system is not yet |
| 3562 | decided. */ |
| 3563 | coding_system = Qnil; |
| 3564 | |
| 3565 | /* If the file name has special constructs in it, |
| 3566 | call the corresponding file handler. */ |
| 3567 | handler = Ffind_file_name_handler (filename, Qinsert_file_contents); |
| 3568 | if (!NILP (handler)) |
| 3569 | { |
| 3570 | val = call6 (handler, Qinsert_file_contents, filename, |
| 3571 | visit, beg, end, replace); |
| 3572 | if (CONSP (val) && CONSP (XCDR (val)) |
| 3573 | && RANGED_INTEGERP (0, XCAR (XCDR (val)), ZV - PT)) |
| 3574 | inserted = XINT (XCAR (XCDR (val))); |
| 3575 | goto handled; |
| 3576 | } |
| 3577 | |
| 3578 | orig_filename = filename; |
| 3579 | filename = ENCODE_FILE (filename); |
| 3580 | |
| 3581 | fd = emacs_open (SSDATA (filename), O_RDONLY, 0); |
| 3582 | if (fd < 0) |
| 3583 | { |
| 3584 | save_errno = errno; |
| 3585 | if (NILP (visit)) |
| 3586 | report_file_error ("Opening input file", Fcons (orig_filename, Qnil)); |
| 3587 | mtime = time_error_value (save_errno); |
| 3588 | st.st_size = -1; |
| 3589 | if (!NILP (Vcoding_system_for_read)) |
| 3590 | Fset (Qbuffer_file_coding_system, Vcoding_system_for_read); |
| 3591 | goto notfound; |
| 3592 | } |
| 3593 | |
| 3594 | /* Replacement should preserve point as it preserves markers. */ |
| 3595 | if (!NILP (replace)) |
| 3596 | record_unwind_protect (restore_point_unwind, Fpoint_marker ()); |
| 3597 | |
| 3598 | record_unwind_protect (close_file_unwind, make_number (fd)); |
| 3599 | |
| 3600 | if (fstat (fd, &st) != 0) |
| 3601 | report_file_error ("Input file status", Fcons (orig_filename, Qnil)); |
| 3602 | mtime = get_stat_mtime (&st); |
| 3603 | |
| 3604 | /* This code will need to be changed in order to work on named |
| 3605 | pipes, and it's probably just not worth it. So we should at |
| 3606 | least signal an error. */ |
| 3607 | if (!S_ISREG (st.st_mode)) |
| 3608 | { |
| 3609 | not_regular = 1; |
| 3610 | |
| 3611 | if (! NILP (visit)) |
| 3612 | goto notfound; |
| 3613 | |
| 3614 | if (! NILP (replace) || ! NILP (beg) || ! NILP (end)) |
| 3615 | xsignal2 (Qfile_error, |
| 3616 | build_string ("not a regular file"), orig_filename); |
| 3617 | } |
| 3618 | |
| 3619 | if (!NILP (visit)) |
| 3620 | { |
| 3621 | if (!NILP (beg) || !NILP (end)) |
| 3622 | error ("Attempt to visit less than an entire file"); |
| 3623 | if (BEG < Z && NILP (replace)) |
| 3624 | error ("Cannot do file visiting in a non-empty buffer"); |
| 3625 | } |
| 3626 | |
| 3627 | if (!NILP (beg)) |
| 3628 | beg_offset = file_offset (beg); |
| 3629 | else |
| 3630 | beg_offset = 0; |
| 3631 | |
| 3632 | if (!NILP (end)) |
| 3633 | end_offset = file_offset (end); |
| 3634 | else |
| 3635 | { |
| 3636 | if (not_regular) |
| 3637 | end_offset = TYPE_MAXIMUM (off_t); |
| 3638 | else |
| 3639 | { |
| 3640 | end_offset = st.st_size; |
| 3641 | |
| 3642 | /* A negative size can happen on a platform that allows file |
| 3643 | sizes greater than the maximum off_t value. */ |
| 3644 | if (end_offset < 0) |
| 3645 | buffer_overflow (); |
| 3646 | |
| 3647 | /* The file size returned from stat may be zero, but data |
| 3648 | may be readable nonetheless, for example when this is a |
| 3649 | file in the /proc filesystem. */ |
| 3650 | if (end_offset == 0) |
| 3651 | end_offset = READ_BUF_SIZE; |
| 3652 | } |
| 3653 | } |
| 3654 | |
| 3655 | /* Check now whether the buffer will become too large, |
| 3656 | in the likely case where the file's length is not changing. |
| 3657 | This saves a lot of needless work before a buffer overflow. */ |
| 3658 | if (! not_regular) |
| 3659 | { |
| 3660 | /* The likely offset where we will stop reading. We could read |
| 3661 | more (or less), if the file grows (or shrinks) as we read it. */ |
| 3662 | off_t likely_end = min (end_offset, st.st_size); |
| 3663 | |
| 3664 | if (beg_offset < likely_end) |
| 3665 | { |
| 3666 | ptrdiff_t buf_bytes |
| 3667 | = Z_BYTE - (!NILP (replace) ? ZV_BYTE - BEGV_BYTE : 0); |
| 3668 | ptrdiff_t buf_growth_max = BUF_BYTES_MAX - buf_bytes; |
| 3669 | off_t likely_growth = likely_end - beg_offset; |
| 3670 | if (buf_growth_max < likely_growth) |
| 3671 | buffer_overflow (); |
| 3672 | } |
| 3673 | } |
| 3674 | |
| 3675 | /* Prevent redisplay optimizations. */ |
| 3676 | current_buffer->clip_changed = 1; |
| 3677 | |
| 3678 | if (EQ (Vcoding_system_for_read, Qauto_save_coding)) |
| 3679 | { |
| 3680 | coding_system = coding_inherit_eol_type (Qutf_8_emacs, Qunix); |
| 3681 | setup_coding_system (coding_system, &coding); |
| 3682 | /* Ensure we set Vlast_coding_system_used. */ |
| 3683 | set_coding_system = 1; |
| 3684 | } |
| 3685 | else if (BEG < Z) |
| 3686 | { |
| 3687 | /* Decide the coding system to use for reading the file now |
| 3688 | because we can't use an optimized method for handling |
| 3689 | `coding:' tag if the current buffer is not empty. */ |
| 3690 | if (!NILP (Vcoding_system_for_read)) |
| 3691 | coding_system = Vcoding_system_for_read; |
| 3692 | else |
| 3693 | { |
| 3694 | /* Don't try looking inside a file for a coding system |
| 3695 | specification if it is not seekable. */ |
| 3696 | if (! not_regular && ! NILP (Vset_auto_coding_function)) |
| 3697 | { |
| 3698 | /* Find a coding system specified in the heading two |
| 3699 | lines or in the tailing several lines of the file. |
| 3700 | We assume that the 1K-byte and 3K-byte for heading |
| 3701 | and tailing respectively are sufficient for this |
| 3702 | purpose. */ |
| 3703 | int nread; |
| 3704 | |
| 3705 | if (st.st_size <= (1024 * 4)) |
| 3706 | nread = emacs_read (fd, read_buf, 1024 * 4); |
| 3707 | else |
| 3708 | { |
| 3709 | nread = emacs_read (fd, read_buf, 1024); |
| 3710 | if (nread == 1024) |
| 3711 | { |
| 3712 | int ntail; |
| 3713 | if (lseek (fd, - (1024 * 3), SEEK_END) < 0) |
| 3714 | report_file_error ("Setting file position", |
| 3715 | Fcons (orig_filename, Qnil)); |
| 3716 | ntail = emacs_read (fd, read_buf + nread, 1024 * 3); |
| 3717 | nread = ntail < 0 ? ntail : nread + ntail; |
| 3718 | } |
| 3719 | } |
| 3720 | |
| 3721 | if (nread < 0) |
| 3722 | error ("IO error reading %s: %s", |
| 3723 | SDATA (orig_filename), emacs_strerror (errno)); |
| 3724 | else if (nread > 0) |
| 3725 | { |
| 3726 | struct buffer *prev = current_buffer; |
| 3727 | Lisp_Object workbuf; |
| 3728 | struct buffer *buf; |
| 3729 | |
| 3730 | record_unwind_current_buffer (); |
| 3731 | |
| 3732 | workbuf = Fget_buffer_create (build_string (" *code-converting-work*")); |
| 3733 | buf = XBUFFER (workbuf); |
| 3734 | |
| 3735 | delete_all_overlays (buf); |
| 3736 | bset_directory (buf, BVAR (current_buffer, directory)); |
| 3737 | bset_read_only (buf, Qnil); |
| 3738 | bset_filename (buf, Qnil); |
| 3739 | bset_undo_list (buf, Qt); |
| 3740 | eassert (buf->overlays_before == NULL); |
| 3741 | eassert (buf->overlays_after == NULL); |
| 3742 | |
| 3743 | set_buffer_internal (buf); |
| 3744 | Ferase_buffer (); |
| 3745 | bset_enable_multibyte_characters (buf, Qnil); |
| 3746 | |
| 3747 | insert_1_both ((char *) read_buf, nread, nread, 0, 0, 0); |
| 3748 | TEMP_SET_PT_BOTH (BEG, BEG_BYTE); |
| 3749 | coding_system = call2 (Vset_auto_coding_function, |
| 3750 | filename, make_number (nread)); |
| 3751 | set_buffer_internal (prev); |
| 3752 | |
| 3753 | /* Discard the unwind protect for recovering the |
| 3754 | current buffer. */ |
| 3755 | specpdl_ptr--; |
| 3756 | |
| 3757 | /* Rewind the file for the actual read done later. */ |
| 3758 | if (lseek (fd, 0, SEEK_SET) < 0) |
| 3759 | report_file_error ("Setting file position", |
| 3760 | Fcons (orig_filename, Qnil)); |
| 3761 | } |
| 3762 | } |
| 3763 | |
| 3764 | if (NILP (coding_system)) |
| 3765 | { |
| 3766 | /* If we have not yet decided a coding system, check |
| 3767 | file-coding-system-alist. */ |
| 3768 | Lisp_Object args[6]; |
| 3769 | |
| 3770 | args[0] = Qinsert_file_contents, args[1] = orig_filename; |
| 3771 | args[2] = visit, args[3] = beg, args[4] = end, args[5] = replace; |
| 3772 | coding_system = Ffind_operation_coding_system (6, args); |
| 3773 | if (CONSP (coding_system)) |
| 3774 | coding_system = XCAR (coding_system); |
| 3775 | } |
| 3776 | } |
| 3777 | |
| 3778 | if (NILP (coding_system)) |
| 3779 | coding_system = Qundecided; |
| 3780 | else |
| 3781 | CHECK_CODING_SYSTEM (coding_system); |
| 3782 | |
| 3783 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 3784 | /* We must suppress all character code conversion except for |
| 3785 | end-of-line conversion. */ |
| 3786 | coding_system = raw_text_coding_system (coding_system); |
| 3787 | |
| 3788 | setup_coding_system (coding_system, &coding); |
| 3789 | /* Ensure we set Vlast_coding_system_used. */ |
| 3790 | set_coding_system = 1; |
| 3791 | } |
| 3792 | |
| 3793 | /* If requested, replace the accessible part of the buffer |
| 3794 | with the file contents. Avoid replacing text at the |
| 3795 | beginning or end of the buffer that matches the file contents; |
| 3796 | that preserves markers pointing to the unchanged parts. |
| 3797 | |
| 3798 | Here we implement this feature in an optimized way |
| 3799 | for the case where code conversion is NOT needed. |
| 3800 | The following if-statement handles the case of conversion |
| 3801 | in a less optimal way. |
| 3802 | |
| 3803 | If the code conversion is "automatic" then we try using this |
| 3804 | method and hope for the best. |
| 3805 | But if we discover the need for conversion, we give up on this method |
| 3806 | and let the following if-statement handle the replace job. */ |
| 3807 | if (!NILP (replace) |
| 3808 | && BEGV < ZV |
| 3809 | && (NILP (coding_system) |
| 3810 | || ! CODING_REQUIRE_DECODING (&coding))) |
| 3811 | { |
| 3812 | /* same_at_start and same_at_end count bytes, |
| 3813 | because file access counts bytes |
| 3814 | and BEG and END count bytes. */ |
| 3815 | ptrdiff_t same_at_start = BEGV_BYTE; |
| 3816 | ptrdiff_t same_at_end = ZV_BYTE; |
| 3817 | ptrdiff_t overlap; |
| 3818 | /* There is still a possibility we will find the need to do code |
| 3819 | conversion. If that happens, set this variable to |
| 3820 | give up on handling REPLACE in the optimized way. */ |
| 3821 | bool giveup_match_end = 0; |
| 3822 | |
| 3823 | if (beg_offset != 0) |
| 3824 | { |
| 3825 | if (lseek (fd, beg_offset, SEEK_SET) < 0) |
| 3826 | report_file_error ("Setting file position", |
| 3827 | Fcons (orig_filename, Qnil)); |
| 3828 | } |
| 3829 | |
| 3830 | immediate_quit = 1; |
| 3831 | QUIT; |
| 3832 | /* Count how many chars at the start of the file |
| 3833 | match the text at the beginning of the buffer. */ |
| 3834 | while (1) |
| 3835 | { |
| 3836 | int nread, bufpos; |
| 3837 | |
| 3838 | nread = emacs_read (fd, read_buf, sizeof read_buf); |
| 3839 | if (nread < 0) |
| 3840 | error ("IO error reading %s: %s", |
| 3841 | SSDATA (orig_filename), emacs_strerror (errno)); |
| 3842 | else if (nread == 0) |
| 3843 | break; |
| 3844 | |
| 3845 | if (CODING_REQUIRE_DETECTION (&coding)) |
| 3846 | { |
| 3847 | coding_system = detect_coding_system ((unsigned char *) read_buf, |
| 3848 | nread, nread, 1, 0, |
| 3849 | coding_system); |
| 3850 | setup_coding_system (coding_system, &coding); |
| 3851 | } |
| 3852 | |
| 3853 | if (CODING_REQUIRE_DECODING (&coding)) |
| 3854 | /* We found that the file should be decoded somehow. |
| 3855 | Let's give up here. */ |
| 3856 | { |
| 3857 | giveup_match_end = 1; |
| 3858 | break; |
| 3859 | } |
| 3860 | |
| 3861 | bufpos = 0; |
| 3862 | while (bufpos < nread && same_at_start < ZV_BYTE |
| 3863 | && FETCH_BYTE (same_at_start) == read_buf[bufpos]) |
| 3864 | same_at_start++, bufpos++; |
| 3865 | /* If we found a discrepancy, stop the scan. |
| 3866 | Otherwise loop around and scan the next bufferful. */ |
| 3867 | if (bufpos != nread) |
| 3868 | break; |
| 3869 | } |
| 3870 | immediate_quit = 0; |
| 3871 | /* If the file matches the buffer completely, |
| 3872 | there's no need to replace anything. */ |
| 3873 | if (same_at_start - BEGV_BYTE == end_offset - beg_offset) |
| 3874 | { |
| 3875 | emacs_close (fd); |
| 3876 | specpdl_ptr--; |
| 3877 | /* Truncate the buffer to the size of the file. */ |
| 3878 | del_range_1 (same_at_start, same_at_end, 0, 0); |
| 3879 | goto handled; |
| 3880 | } |
| 3881 | immediate_quit = 1; |
| 3882 | QUIT; |
| 3883 | /* Count how many chars at the end of the file |
| 3884 | match the text at the end of the buffer. But, if we have |
| 3885 | already found that decoding is necessary, don't waste time. */ |
| 3886 | while (!giveup_match_end) |
| 3887 | { |
| 3888 | int total_read, nread, bufpos, trial; |
| 3889 | off_t curpos; |
| 3890 | |
| 3891 | /* At what file position are we now scanning? */ |
| 3892 | curpos = end_offset - (ZV_BYTE - same_at_end); |
| 3893 | /* If the entire file matches the buffer tail, stop the scan. */ |
| 3894 | if (curpos == 0) |
| 3895 | break; |
| 3896 | /* How much can we scan in the next step? */ |
| 3897 | trial = min (curpos, sizeof read_buf); |
| 3898 | if (lseek (fd, curpos - trial, SEEK_SET) < 0) |
| 3899 | report_file_error ("Setting file position", |
| 3900 | Fcons (orig_filename, Qnil)); |
| 3901 | |
| 3902 | total_read = nread = 0; |
| 3903 | while (total_read < trial) |
| 3904 | { |
| 3905 | nread = emacs_read (fd, read_buf + total_read, trial - total_read); |
| 3906 | if (nread < 0) |
| 3907 | error ("IO error reading %s: %s", |
| 3908 | SDATA (orig_filename), emacs_strerror (errno)); |
| 3909 | else if (nread == 0) |
| 3910 | break; |
| 3911 | total_read += nread; |
| 3912 | } |
| 3913 | |
| 3914 | /* Scan this bufferful from the end, comparing with |
| 3915 | the Emacs buffer. */ |
| 3916 | bufpos = total_read; |
| 3917 | |
| 3918 | /* Compare with same_at_start to avoid counting some buffer text |
| 3919 | as matching both at the file's beginning and at the end. */ |
| 3920 | while (bufpos > 0 && same_at_end > same_at_start |
| 3921 | && FETCH_BYTE (same_at_end - 1) == read_buf[bufpos - 1]) |
| 3922 | same_at_end--, bufpos--; |
| 3923 | |
| 3924 | /* If we found a discrepancy, stop the scan. |
| 3925 | Otherwise loop around and scan the preceding bufferful. */ |
| 3926 | if (bufpos != 0) |
| 3927 | { |
| 3928 | /* If this discrepancy is because of code conversion, |
| 3929 | we cannot use this method; giveup and try the other. */ |
| 3930 | if (same_at_end > same_at_start |
| 3931 | && FETCH_BYTE (same_at_end - 1) >= 0200 |
| 3932 | && ! NILP (BVAR (current_buffer, enable_multibyte_characters)) |
| 3933 | && (CODING_MAY_REQUIRE_DECODING (&coding))) |
| 3934 | giveup_match_end = 1; |
| 3935 | break; |
| 3936 | } |
| 3937 | |
| 3938 | if (nread == 0) |
| 3939 | break; |
| 3940 | } |
| 3941 | immediate_quit = 0; |
| 3942 | |
| 3943 | if (! giveup_match_end) |
| 3944 | { |
| 3945 | ptrdiff_t temp; |
| 3946 | |
| 3947 | /* We win! We can handle REPLACE the optimized way. */ |
| 3948 | |
| 3949 | /* Extend the start of non-matching text area to multibyte |
| 3950 | character boundary. */ |
| 3951 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 3952 | while (same_at_start > BEGV_BYTE |
| 3953 | && ! CHAR_HEAD_P (FETCH_BYTE (same_at_start))) |
| 3954 | same_at_start--; |
| 3955 | |
| 3956 | /* Extend the end of non-matching text area to multibyte |
| 3957 | character boundary. */ |
| 3958 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 3959 | while (same_at_end < ZV_BYTE |
| 3960 | && ! CHAR_HEAD_P (FETCH_BYTE (same_at_end))) |
| 3961 | same_at_end++; |
| 3962 | |
| 3963 | /* Don't try to reuse the same piece of text twice. */ |
| 3964 | overlap = (same_at_start - BEGV_BYTE |
| 3965 | - (same_at_end |
| 3966 | + (! NILP (end) ? end_offset : st.st_size) - ZV_BYTE)); |
| 3967 | if (overlap > 0) |
| 3968 | same_at_end += overlap; |
| 3969 | |
| 3970 | /* Arrange to read only the nonmatching middle part of the file. */ |
| 3971 | beg_offset += same_at_start - BEGV_BYTE; |
| 3972 | end_offset -= ZV_BYTE - same_at_end; |
| 3973 | |
| 3974 | del_range_byte (same_at_start, same_at_end, 0); |
| 3975 | /* Insert from the file at the proper position. */ |
| 3976 | temp = BYTE_TO_CHAR (same_at_start); |
| 3977 | SET_PT_BOTH (temp, same_at_start); |
| 3978 | |
| 3979 | /* If display currently starts at beginning of line, |
| 3980 | keep it that way. */ |
| 3981 | if (XBUFFER (XWINDOW (selected_window)->buffer) == current_buffer) |
| 3982 | XWINDOW (selected_window)->start_at_line_beg = !NILP (Fbolp ()); |
| 3983 | |
| 3984 | replace_handled = 1; |
| 3985 | } |
| 3986 | } |
| 3987 | |
| 3988 | /* If requested, replace the accessible part of the buffer |
| 3989 | with the file contents. Avoid replacing text at the |
| 3990 | beginning or end of the buffer that matches the file contents; |
| 3991 | that preserves markers pointing to the unchanged parts. |
| 3992 | |
| 3993 | Here we implement this feature for the case where code conversion |
| 3994 | is needed, in a simple way that needs a lot of memory. |
| 3995 | The preceding if-statement handles the case of no conversion |
| 3996 | in a more optimized way. */ |
| 3997 | if (!NILP (replace) && ! replace_handled && BEGV < ZV) |
| 3998 | { |
| 3999 | ptrdiff_t same_at_start = BEGV_BYTE; |
| 4000 | ptrdiff_t same_at_end = ZV_BYTE; |
| 4001 | ptrdiff_t same_at_start_charpos; |
| 4002 | ptrdiff_t inserted_chars; |
| 4003 | ptrdiff_t overlap; |
| 4004 | ptrdiff_t bufpos; |
| 4005 | unsigned char *decoded; |
| 4006 | ptrdiff_t temp; |
| 4007 | ptrdiff_t this = 0; |
| 4008 | ptrdiff_t this_count = SPECPDL_INDEX (); |
| 4009 | bool multibyte |
| 4010 | = ! NILP (BVAR (current_buffer, enable_multibyte_characters)); |
| 4011 | Lisp_Object conversion_buffer; |
| 4012 | struct gcpro gcpro1; |
| 4013 | |
| 4014 | conversion_buffer = code_conversion_save (1, multibyte); |
| 4015 | |
| 4016 | /* First read the whole file, performing code conversion into |
| 4017 | CONVERSION_BUFFER. */ |
| 4018 | |
| 4019 | if (lseek (fd, beg_offset, SEEK_SET) < 0) |
| 4020 | report_file_error ("Setting file position", |
| 4021 | Fcons (orig_filename, Qnil)); |
| 4022 | |
| 4023 | inserted = 0; /* Bytes put into CONVERSION_BUFFER so far. */ |
| 4024 | unprocessed = 0; /* Bytes not processed in previous loop. */ |
| 4025 | |
| 4026 | GCPRO1 (conversion_buffer); |
| 4027 | while (1) |
| 4028 | { |
| 4029 | /* Read at most READ_BUF_SIZE bytes at a time, to allow |
| 4030 | quitting while reading a huge file. */ |
| 4031 | |
| 4032 | /* Allow quitting out of the actual I/O. */ |
| 4033 | immediate_quit = 1; |
| 4034 | QUIT; |
| 4035 | this = emacs_read (fd, read_buf + unprocessed, |
| 4036 | READ_BUF_SIZE - unprocessed); |
| 4037 | immediate_quit = 0; |
| 4038 | |
| 4039 | if (this <= 0) |
| 4040 | break; |
| 4041 | |
| 4042 | BUF_TEMP_SET_PT (XBUFFER (conversion_buffer), |
| 4043 | BUF_Z (XBUFFER (conversion_buffer))); |
| 4044 | decode_coding_c_string (&coding, (unsigned char *) read_buf, |
| 4045 | unprocessed + this, conversion_buffer); |
| 4046 | unprocessed = coding.carryover_bytes; |
| 4047 | if (coding.carryover_bytes > 0) |
| 4048 | memcpy (read_buf, coding.carryover, unprocessed); |
| 4049 | } |
| 4050 | UNGCPRO; |
| 4051 | emacs_close (fd); |
| 4052 | |
| 4053 | /* We should remove the unwind_protect calling |
| 4054 | close_file_unwind, but other stuff has been added the stack, |
| 4055 | so defer the removal till we reach the `handled' label. */ |
| 4056 | deferred_remove_unwind_protect = 1; |
| 4057 | |
| 4058 | if (this < 0) |
| 4059 | error ("IO error reading %s: %s", |
| 4060 | SDATA (orig_filename), emacs_strerror (errno)); |
| 4061 | |
| 4062 | if (unprocessed > 0) |
| 4063 | { |
| 4064 | coding.mode |= CODING_MODE_LAST_BLOCK; |
| 4065 | decode_coding_c_string (&coding, (unsigned char *) read_buf, |
| 4066 | unprocessed, conversion_buffer); |
| 4067 | coding.mode &= ~CODING_MODE_LAST_BLOCK; |
| 4068 | } |
| 4069 | |
| 4070 | coding_system = CODING_ID_NAME (coding.id); |
| 4071 | set_coding_system = 1; |
| 4072 | decoded = BUF_BEG_ADDR (XBUFFER (conversion_buffer)); |
| 4073 | inserted = (BUF_Z_BYTE (XBUFFER (conversion_buffer)) |
| 4074 | - BUF_BEG_BYTE (XBUFFER (conversion_buffer))); |
| 4075 | |
| 4076 | /* Compare the beginning of the converted string with the buffer |
| 4077 | text. */ |
| 4078 | |
| 4079 | bufpos = 0; |
| 4080 | while (bufpos < inserted && same_at_start < same_at_end |
| 4081 | && FETCH_BYTE (same_at_start) == decoded[bufpos]) |
| 4082 | same_at_start++, bufpos++; |
| 4083 | |
| 4084 | /* If the file matches the head of buffer completely, |
| 4085 | there's no need to replace anything. */ |
| 4086 | |
| 4087 | if (bufpos == inserted) |
| 4088 | { |
| 4089 | /* Truncate the buffer to the size of the file. */ |
| 4090 | if (same_at_start == same_at_end) |
| 4091 | nochange = 1; |
| 4092 | else |
| 4093 | del_range_byte (same_at_start, same_at_end, 0); |
| 4094 | inserted = 0; |
| 4095 | |
| 4096 | unbind_to (this_count, Qnil); |
| 4097 | goto handled; |
| 4098 | } |
| 4099 | |
| 4100 | /* Extend the start of non-matching text area to the previous |
| 4101 | multibyte character boundary. */ |
| 4102 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 4103 | while (same_at_start > BEGV_BYTE |
| 4104 | && ! CHAR_HEAD_P (FETCH_BYTE (same_at_start))) |
| 4105 | same_at_start--; |
| 4106 | |
| 4107 | /* Scan this bufferful from the end, comparing with |
| 4108 | the Emacs buffer. */ |
| 4109 | bufpos = inserted; |
| 4110 | |
| 4111 | /* Compare with same_at_start to avoid counting some buffer text |
| 4112 | as matching both at the file's beginning and at the end. */ |
| 4113 | while (bufpos > 0 && same_at_end > same_at_start |
| 4114 | && FETCH_BYTE (same_at_end - 1) == decoded[bufpos - 1]) |
| 4115 | same_at_end--, bufpos--; |
| 4116 | |
| 4117 | /* Extend the end of non-matching text area to the next |
| 4118 | multibyte character boundary. */ |
| 4119 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 4120 | while (same_at_end < ZV_BYTE |
| 4121 | && ! CHAR_HEAD_P (FETCH_BYTE (same_at_end))) |
| 4122 | same_at_end++; |
| 4123 | |
| 4124 | /* Don't try to reuse the same piece of text twice. */ |
| 4125 | overlap = same_at_start - BEGV_BYTE - (same_at_end + inserted - ZV_BYTE); |
| 4126 | if (overlap > 0) |
| 4127 | same_at_end += overlap; |
| 4128 | |
| 4129 | /* If display currently starts at beginning of line, |
| 4130 | keep it that way. */ |
| 4131 | if (XBUFFER (XWINDOW (selected_window)->buffer) == current_buffer) |
| 4132 | XWINDOW (selected_window)->start_at_line_beg = !NILP (Fbolp ()); |
| 4133 | |
| 4134 | /* Replace the chars that we need to replace, |
| 4135 | and update INSERTED to equal the number of bytes |
| 4136 | we are taking from the decoded string. */ |
| 4137 | inserted -= (ZV_BYTE - same_at_end) + (same_at_start - BEGV_BYTE); |
| 4138 | |
| 4139 | if (same_at_end != same_at_start) |
| 4140 | { |
| 4141 | del_range_byte (same_at_start, same_at_end, 0); |
| 4142 | temp = GPT; |
| 4143 | same_at_start = GPT_BYTE; |
| 4144 | } |
| 4145 | else |
| 4146 | { |
| 4147 | temp = BYTE_TO_CHAR (same_at_start); |
| 4148 | } |
| 4149 | /* Insert from the file at the proper position. */ |
| 4150 | SET_PT_BOTH (temp, same_at_start); |
| 4151 | same_at_start_charpos |
| 4152 | = buf_bytepos_to_charpos (XBUFFER (conversion_buffer), |
| 4153 | same_at_start - BEGV_BYTE |
| 4154 | + BUF_BEG_BYTE (XBUFFER (conversion_buffer))); |
| 4155 | inserted_chars |
| 4156 | = (buf_bytepos_to_charpos (XBUFFER (conversion_buffer), |
| 4157 | same_at_start + inserted - BEGV_BYTE |
| 4158 | + BUF_BEG_BYTE (XBUFFER (conversion_buffer))) |
| 4159 | - same_at_start_charpos); |
| 4160 | /* This binding is to avoid ask-user-about-supersession-threat |
| 4161 | being called in insert_from_buffer (via in |
| 4162 | prepare_to_modify_buffer). */ |
| 4163 | specbind (intern ("buffer-file-name"), Qnil); |
| 4164 | insert_from_buffer (XBUFFER (conversion_buffer), |
| 4165 | same_at_start_charpos, inserted_chars, 0); |
| 4166 | /* Set `inserted' to the number of inserted characters. */ |
| 4167 | inserted = PT - temp; |
| 4168 | /* Set point before the inserted characters. */ |
| 4169 | SET_PT_BOTH (temp, same_at_start); |
| 4170 | |
| 4171 | unbind_to (this_count, Qnil); |
| 4172 | |
| 4173 | goto handled; |
| 4174 | } |
| 4175 | |
| 4176 | if (! not_regular) |
| 4177 | total = end_offset - beg_offset; |
| 4178 | else |
| 4179 | /* For a special file, all we can do is guess. */ |
| 4180 | total = READ_BUF_SIZE; |
| 4181 | |
| 4182 | if (NILP (visit) && total > 0) |
| 4183 | { |
| 4184 | #ifdef CLASH_DETECTION |
| 4185 | if (!NILP (BVAR (current_buffer, file_truename)) |
| 4186 | /* Make binding buffer-file-name to nil effective. */ |
| 4187 | && !NILP (BVAR (current_buffer, filename)) |
| 4188 | && SAVE_MODIFF >= MODIFF) |
| 4189 | we_locked_file = 1; |
| 4190 | #endif /* CLASH_DETECTION */ |
| 4191 | prepare_to_modify_buffer (GPT, GPT, NULL); |
| 4192 | } |
| 4193 | |
| 4194 | move_gap_both (PT, PT_BYTE); |
| 4195 | if (GAP_SIZE < total) |
| 4196 | make_gap (total - GAP_SIZE); |
| 4197 | |
| 4198 | if (beg_offset != 0 || !NILP (replace)) |
| 4199 | { |
| 4200 | if (lseek (fd, beg_offset, SEEK_SET) < 0) |
| 4201 | report_file_error ("Setting file position", |
| 4202 | Fcons (orig_filename, Qnil)); |
| 4203 | } |
| 4204 | |
| 4205 | /* In the following loop, HOW_MUCH contains the total bytes read so |
| 4206 | far for a regular file, and not changed for a special file. But, |
| 4207 | before exiting the loop, it is set to a negative value if I/O |
| 4208 | error occurs. */ |
| 4209 | how_much = 0; |
| 4210 | |
| 4211 | /* Total bytes inserted. */ |
| 4212 | inserted = 0; |
| 4213 | |
| 4214 | /* Here, we don't do code conversion in the loop. It is done by |
| 4215 | decode_coding_gap after all data are read into the buffer. */ |
| 4216 | { |
| 4217 | ptrdiff_t gap_size = GAP_SIZE; |
| 4218 | |
| 4219 | while (how_much < total) |
| 4220 | { |
| 4221 | /* try is reserved in some compilers (Microsoft C) */ |
| 4222 | ptrdiff_t trytry = min (total - how_much, READ_BUF_SIZE); |
| 4223 | ptrdiff_t this; |
| 4224 | |
| 4225 | if (not_regular) |
| 4226 | { |
| 4227 | Lisp_Object nbytes; |
| 4228 | |
| 4229 | /* Maybe make more room. */ |
| 4230 | if (gap_size < trytry) |
| 4231 | { |
| 4232 | make_gap (trytry - gap_size); |
| 4233 | gap_size = GAP_SIZE - inserted; |
| 4234 | } |
| 4235 | |
| 4236 | /* Read from the file, capturing `quit'. When an |
| 4237 | error occurs, end the loop, and arrange for a quit |
| 4238 | to be signaled after decoding the text we read. */ |
| 4239 | nbytes = internal_condition_case_1 |
| 4240 | (read_non_regular, |
| 4241 | make_save_value ("iii", (ptrdiff_t) fd, inserted, trytry), |
| 4242 | Qerror, read_non_regular_quit); |
| 4243 | |
| 4244 | if (NILP (nbytes)) |
| 4245 | { |
| 4246 | read_quit = 1; |
| 4247 | break; |
| 4248 | } |
| 4249 | |
| 4250 | this = XINT (nbytes); |
| 4251 | } |
| 4252 | else |
| 4253 | { |
| 4254 | /* Allow quitting out of the actual I/O. We don't make text |
| 4255 | part of the buffer until all the reading is done, so a C-g |
| 4256 | here doesn't do any harm. */ |
| 4257 | immediate_quit = 1; |
| 4258 | QUIT; |
| 4259 | this = emacs_read (fd, |
| 4260 | ((char *) BEG_ADDR + PT_BYTE - BEG_BYTE |
| 4261 | + inserted), |
| 4262 | trytry); |
| 4263 | immediate_quit = 0; |
| 4264 | } |
| 4265 | |
| 4266 | if (this <= 0) |
| 4267 | { |
| 4268 | how_much = this; |
| 4269 | break; |
| 4270 | } |
| 4271 | |
| 4272 | gap_size -= this; |
| 4273 | |
| 4274 | /* For a regular file, where TOTAL is the real size, |
| 4275 | count HOW_MUCH to compare with it. |
| 4276 | For a special file, where TOTAL is just a buffer size, |
| 4277 | so don't bother counting in HOW_MUCH. |
| 4278 | (INSERTED is where we count the number of characters inserted.) */ |
| 4279 | if (! not_regular) |
| 4280 | how_much += this; |
| 4281 | inserted += this; |
| 4282 | } |
| 4283 | } |
| 4284 | |
| 4285 | /* Now we have either read all the file data into the gap, |
| 4286 | or stop reading on I/O error or quit. If nothing was |
| 4287 | read, undo marking the buffer modified. */ |
| 4288 | |
| 4289 | if (inserted == 0) |
| 4290 | { |
| 4291 | #ifdef CLASH_DETECTION |
| 4292 | if (we_locked_file) |
| 4293 | unlock_file (BVAR (current_buffer, file_truename)); |
| 4294 | #endif |
| 4295 | Vdeactivate_mark = old_Vdeactivate_mark; |
| 4296 | } |
| 4297 | else |
| 4298 | Vdeactivate_mark = Qt; |
| 4299 | |
| 4300 | emacs_close (fd); |
| 4301 | |
| 4302 | /* Discard the unwind protect for closing the file. */ |
| 4303 | specpdl_ptr--; |
| 4304 | |
| 4305 | if (how_much < 0) |
| 4306 | error ("IO error reading %s: %s", |
| 4307 | SDATA (orig_filename), emacs_strerror (errno)); |
| 4308 | |
| 4309 | /* Make the text read part of the buffer. */ |
| 4310 | GAP_SIZE -= inserted; |
| 4311 | GPT += inserted; |
| 4312 | GPT_BYTE += inserted; |
| 4313 | ZV += inserted; |
| 4314 | ZV_BYTE += inserted; |
| 4315 | Z += inserted; |
| 4316 | Z_BYTE += inserted; |
| 4317 | |
| 4318 | if (GAP_SIZE > 0) |
| 4319 | /* Put an anchor to ensure multi-byte form ends at gap. */ |
| 4320 | *GPT_ADDR = 0; |
| 4321 | |
| 4322 | notfound: |
| 4323 | |
| 4324 | if (NILP (coding_system)) |
| 4325 | { |
| 4326 | /* The coding system is not yet decided. Decide it by an |
| 4327 | optimized method for handling `coding:' tag. |
| 4328 | |
| 4329 | Note that we can get here only if the buffer was empty |
| 4330 | before the insertion. */ |
| 4331 | |
| 4332 | if (!NILP (Vcoding_system_for_read)) |
| 4333 | coding_system = Vcoding_system_for_read; |
| 4334 | else |
| 4335 | { |
| 4336 | /* Since we are sure that the current buffer was empty |
| 4337 | before the insertion, we can toggle |
| 4338 | enable-multibyte-characters directly here without taking |
| 4339 | care of marker adjustment. By this way, we can run Lisp |
| 4340 | program safely before decoding the inserted text. */ |
| 4341 | Lisp_Object unwind_data; |
| 4342 | ptrdiff_t count1 = SPECPDL_INDEX (); |
| 4343 | |
| 4344 | unwind_data = Fcons (BVAR (current_buffer, enable_multibyte_characters), |
| 4345 | Fcons (BVAR (current_buffer, undo_list), |
| 4346 | Fcurrent_buffer ())); |
| 4347 | bset_enable_multibyte_characters (current_buffer, Qnil); |
| 4348 | bset_undo_list (current_buffer, Qt); |
| 4349 | record_unwind_protect (decide_coding_unwind, unwind_data); |
| 4350 | |
| 4351 | if (inserted > 0 && ! NILP (Vset_auto_coding_function)) |
| 4352 | { |
| 4353 | coding_system = call2 (Vset_auto_coding_function, |
| 4354 | filename, make_number (inserted)); |
| 4355 | } |
| 4356 | |
| 4357 | if (NILP (coding_system)) |
| 4358 | { |
| 4359 | /* If the coding system is not yet decided, check |
| 4360 | file-coding-system-alist. */ |
| 4361 | Lisp_Object args[6]; |
| 4362 | |
| 4363 | args[0] = Qinsert_file_contents, args[1] = orig_filename; |
| 4364 | args[2] = visit, args[3] = beg, args[4] = end, args[5] = Qnil; |
| 4365 | coding_system = Ffind_operation_coding_system (6, args); |
| 4366 | if (CONSP (coding_system)) |
| 4367 | coding_system = XCAR (coding_system); |
| 4368 | } |
| 4369 | unbind_to (count1, Qnil); |
| 4370 | inserted = Z_BYTE - BEG_BYTE; |
| 4371 | } |
| 4372 | |
| 4373 | if (NILP (coding_system)) |
| 4374 | coding_system = Qundecided; |
| 4375 | else |
| 4376 | CHECK_CODING_SYSTEM (coding_system); |
| 4377 | |
| 4378 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 4379 | /* We must suppress all character code conversion except for |
| 4380 | end-of-line conversion. */ |
| 4381 | coding_system = raw_text_coding_system (coding_system); |
| 4382 | setup_coding_system (coding_system, &coding); |
| 4383 | /* Ensure we set Vlast_coding_system_used. */ |
| 4384 | set_coding_system = 1; |
| 4385 | } |
| 4386 | |
| 4387 | if (!NILP (visit)) |
| 4388 | { |
| 4389 | /* When we visit a file by raw-text, we change the buffer to |
| 4390 | unibyte. */ |
| 4391 | if (CODING_FOR_UNIBYTE (&coding) |
| 4392 | /* Can't do this if part of the buffer might be preserved. */ |
| 4393 | && NILP (replace)) |
| 4394 | /* Visiting a file with these coding system makes the buffer |
| 4395 | unibyte. */ |
| 4396 | bset_enable_multibyte_characters (current_buffer, Qnil); |
| 4397 | } |
| 4398 | |
| 4399 | coding.dst_multibyte = ! NILP (BVAR (current_buffer, enable_multibyte_characters)); |
| 4400 | if (CODING_MAY_REQUIRE_DECODING (&coding) |
| 4401 | && (inserted > 0 || CODING_REQUIRE_FLUSHING (&coding))) |
| 4402 | { |
| 4403 | move_gap_both (PT, PT_BYTE); |
| 4404 | GAP_SIZE += inserted; |
| 4405 | ZV_BYTE -= inserted; |
| 4406 | Z_BYTE -= inserted; |
| 4407 | ZV -= inserted; |
| 4408 | Z -= inserted; |
| 4409 | decode_coding_gap (&coding, inserted, inserted); |
| 4410 | inserted = coding.produced_char; |
| 4411 | coding_system = CODING_ID_NAME (coding.id); |
| 4412 | } |
| 4413 | else if (inserted > 0) |
| 4414 | adjust_after_insert (PT, PT_BYTE, PT + inserted, PT_BYTE + inserted, |
| 4415 | inserted); |
| 4416 | |
| 4417 | /* Call after-change hooks for the inserted text, aside from the case |
| 4418 | of normal visiting (not with REPLACE), which is done in a new buffer |
| 4419 | "before" the buffer is changed. */ |
| 4420 | if (inserted > 0 && total > 0 |
| 4421 | && (NILP (visit) || !NILP (replace))) |
| 4422 | { |
| 4423 | signal_after_change (PT, 0, inserted); |
| 4424 | update_compositions (PT, PT, CHECK_BORDER); |
| 4425 | } |
| 4426 | |
| 4427 | /* Now INSERTED is measured in characters. */ |
| 4428 | |
| 4429 | handled: |
| 4430 | |
| 4431 | if (deferred_remove_unwind_protect) |
| 4432 | /* If requested above, discard the unwind protect for closing the |
| 4433 | file. */ |
| 4434 | specpdl_ptr--; |
| 4435 | |
| 4436 | if (!NILP (visit)) |
| 4437 | { |
| 4438 | if (!EQ (BVAR (current_buffer, undo_list), Qt) && !nochange) |
| 4439 | bset_undo_list (current_buffer, Qnil); |
| 4440 | |
| 4441 | if (NILP (handler)) |
| 4442 | { |
| 4443 | current_buffer->modtime = mtime; |
| 4444 | current_buffer->modtime_size = st.st_size; |
| 4445 | bset_filename (current_buffer, orig_filename); |
| 4446 | } |
| 4447 | |
| 4448 | SAVE_MODIFF = MODIFF; |
| 4449 | BUF_AUTOSAVE_MODIFF (current_buffer) = MODIFF; |
| 4450 | XSETFASTINT (BVAR (current_buffer, save_length), Z - BEG); |
| 4451 | #ifdef CLASH_DETECTION |
| 4452 | if (NILP (handler)) |
| 4453 | { |
| 4454 | if (!NILP (BVAR (current_buffer, file_truename))) |
| 4455 | unlock_file (BVAR (current_buffer, file_truename)); |
| 4456 | unlock_file (filename); |
| 4457 | } |
| 4458 | #endif /* CLASH_DETECTION */ |
| 4459 | if (not_regular) |
| 4460 | xsignal2 (Qfile_error, |
| 4461 | build_string ("not a regular file"), orig_filename); |
| 4462 | } |
| 4463 | |
| 4464 | if (set_coding_system) |
| 4465 | Vlast_coding_system_used = coding_system; |
| 4466 | |
| 4467 | if (! NILP (Ffboundp (Qafter_insert_file_set_coding))) |
| 4468 | { |
| 4469 | insval = call2 (Qafter_insert_file_set_coding, make_number (inserted), |
| 4470 | visit); |
| 4471 | if (! NILP (insval)) |
| 4472 | { |
| 4473 | if (! RANGED_INTEGERP (0, insval, ZV - PT)) |
| 4474 | wrong_type_argument (intern ("inserted-chars"), insval); |
| 4475 | inserted = XFASTINT (insval); |
| 4476 | } |
| 4477 | } |
| 4478 | |
| 4479 | /* Decode file format. */ |
| 4480 | if (inserted > 0) |
| 4481 | { |
| 4482 | /* Don't run point motion or modification hooks when decoding. */ |
| 4483 | ptrdiff_t count1 = SPECPDL_INDEX (); |
| 4484 | ptrdiff_t old_inserted = inserted; |
| 4485 | specbind (Qinhibit_point_motion_hooks, Qt); |
| 4486 | specbind (Qinhibit_modification_hooks, Qt); |
| 4487 | |
| 4488 | /* Save old undo list and don't record undo for decoding. */ |
| 4489 | old_undo = BVAR (current_buffer, undo_list); |
| 4490 | bset_undo_list (current_buffer, Qt); |
| 4491 | |
| 4492 | if (NILP (replace)) |
| 4493 | { |
| 4494 | insval = call3 (Qformat_decode, |
| 4495 | Qnil, make_number (inserted), visit); |
| 4496 | if (! RANGED_INTEGERP (0, insval, ZV - PT)) |
| 4497 | wrong_type_argument (intern ("inserted-chars"), insval); |
| 4498 | inserted = XFASTINT (insval); |
| 4499 | } |
| 4500 | else |
| 4501 | { |
| 4502 | /* If REPLACE is non-nil and we succeeded in not replacing the |
| 4503 | beginning or end of the buffer text with the file's contents, |
| 4504 | call format-decode with `point' positioned at the beginning |
| 4505 | of the buffer and `inserted' equaling the number of |
| 4506 | characters in the buffer. Otherwise, format-decode might |
| 4507 | fail to correctly analyze the beginning or end of the buffer. |
| 4508 | Hence we temporarily save `point' and `inserted' here and |
| 4509 | restore `point' iff format-decode did not insert or delete |
| 4510 | any text. Otherwise we leave `point' at point-min. */ |
| 4511 | ptrdiff_t opoint = PT; |
| 4512 | ptrdiff_t opoint_byte = PT_BYTE; |
| 4513 | ptrdiff_t oinserted = ZV - BEGV; |
| 4514 | EMACS_INT ochars_modiff = CHARS_MODIFF; |
| 4515 | |
| 4516 | TEMP_SET_PT_BOTH (BEGV, BEGV_BYTE); |
| 4517 | insval = call3 (Qformat_decode, |
| 4518 | Qnil, make_number (oinserted), visit); |
| 4519 | if (! RANGED_INTEGERP (0, insval, ZV - PT)) |
| 4520 | wrong_type_argument (intern ("inserted-chars"), insval); |
| 4521 | if (ochars_modiff == CHARS_MODIFF) |
| 4522 | /* format_decode didn't modify buffer's characters => move |
| 4523 | point back to position before inserted text and leave |
| 4524 | value of inserted alone. */ |
| 4525 | SET_PT_BOTH (opoint, opoint_byte); |
| 4526 | else |
| 4527 | /* format_decode modified buffer's characters => consider |
| 4528 | entire buffer changed and leave point at point-min. */ |
| 4529 | inserted = XFASTINT (insval); |
| 4530 | } |
| 4531 | |
| 4532 | /* For consistency with format-decode call these now iff inserted > 0 |
| 4533 | (martin 2007-06-28). */ |
| 4534 | p = Vafter_insert_file_functions; |
| 4535 | while (CONSP (p)) |
| 4536 | { |
| 4537 | if (NILP (replace)) |
| 4538 | { |
| 4539 | insval = call1 (XCAR (p), make_number (inserted)); |
| 4540 | if (!NILP (insval)) |
| 4541 | { |
| 4542 | if (! RANGED_INTEGERP (0, insval, ZV - PT)) |
| 4543 | wrong_type_argument (intern ("inserted-chars"), insval); |
| 4544 | inserted = XFASTINT (insval); |
| 4545 | } |
| 4546 | } |
| 4547 | else |
| 4548 | { |
| 4549 | /* For the rationale of this see the comment on |
| 4550 | format-decode above. */ |
| 4551 | ptrdiff_t opoint = PT; |
| 4552 | ptrdiff_t opoint_byte = PT_BYTE; |
| 4553 | ptrdiff_t oinserted = ZV - BEGV; |
| 4554 | EMACS_INT ochars_modiff = CHARS_MODIFF; |
| 4555 | |
| 4556 | TEMP_SET_PT_BOTH (BEGV, BEGV_BYTE); |
| 4557 | insval = call1 (XCAR (p), make_number (oinserted)); |
| 4558 | if (!NILP (insval)) |
| 4559 | { |
| 4560 | if (! RANGED_INTEGERP (0, insval, ZV - PT)) |
| 4561 | wrong_type_argument (intern ("inserted-chars"), insval); |
| 4562 | if (ochars_modiff == CHARS_MODIFF) |
| 4563 | /* after_insert_file_functions didn't modify |
| 4564 | buffer's characters => move point back to |
| 4565 | position before inserted text and leave value of |
| 4566 | inserted alone. */ |
| 4567 | SET_PT_BOTH (opoint, opoint_byte); |
| 4568 | else |
| 4569 | /* after_insert_file_functions did modify buffer's |
| 4570 | characters => consider entire buffer changed and |
| 4571 | leave point at point-min. */ |
| 4572 | inserted = XFASTINT (insval); |
| 4573 | } |
| 4574 | } |
| 4575 | |
| 4576 | QUIT; |
| 4577 | p = XCDR (p); |
| 4578 | } |
| 4579 | |
| 4580 | if (NILP (visit)) |
| 4581 | { |
| 4582 | bset_undo_list (current_buffer, old_undo); |
| 4583 | if (CONSP (old_undo) && inserted != old_inserted) |
| 4584 | { |
| 4585 | /* Adjust the last undo record for the size change during |
| 4586 | the format conversion. */ |
| 4587 | Lisp_Object tem = XCAR (old_undo); |
| 4588 | if (CONSP (tem) && INTEGERP (XCAR (tem)) |
| 4589 | && INTEGERP (XCDR (tem)) |
| 4590 | && XFASTINT (XCDR (tem)) == PT + old_inserted) |
| 4591 | XSETCDR (tem, make_number (PT + inserted)); |
| 4592 | } |
| 4593 | } |
| 4594 | else |
| 4595 | /* If undo_list was Qt before, keep it that way. |
| 4596 | Otherwise start with an empty undo_list. */ |
| 4597 | bset_undo_list (current_buffer, EQ (old_undo, Qt) ? Qt : Qnil); |
| 4598 | |
| 4599 | unbind_to (count1, Qnil); |
| 4600 | } |
| 4601 | |
| 4602 | if (!NILP (visit) |
| 4603 | && EMACS_NSECS (current_buffer->modtime) == NONEXISTENT_MODTIME_NSECS) |
| 4604 | { |
| 4605 | /* If visiting nonexistent file, return nil. */ |
| 4606 | errno = save_errno; |
| 4607 | report_file_error ("Opening input file", Fcons (orig_filename, Qnil)); |
| 4608 | } |
| 4609 | |
| 4610 | if (read_quit) |
| 4611 | Fsignal (Qquit, Qnil); |
| 4612 | |
| 4613 | /* Retval needs to be dealt with in all cases consistently. */ |
| 4614 | if (NILP (val)) |
| 4615 | val = list2 (orig_filename, make_number (inserted)); |
| 4616 | |
| 4617 | RETURN_UNGCPRO (unbind_to (count, val)); |
| 4618 | } |
| 4619 | \f |
| 4620 | static Lisp_Object build_annotations (Lisp_Object, Lisp_Object); |
| 4621 | |
| 4622 | static Lisp_Object |
| 4623 | build_annotations_unwind (Lisp_Object arg) |
| 4624 | { |
| 4625 | Vwrite_region_annotation_buffers = arg; |
| 4626 | return Qnil; |
| 4627 | } |
| 4628 | |
| 4629 | /* Decide the coding-system to encode the data with. */ |
| 4630 | |
| 4631 | DEFUN ("choose-write-coding-system", Fchoose_write_coding_system, |
| 4632 | Schoose_write_coding_system, 3, 6, 0, |
| 4633 | doc: /* Choose the coding system for writing a file. |
| 4634 | Arguments are as for `write-region'. |
| 4635 | This function is for internal use only. It may prompt the user. */ ) |
| 4636 | (Lisp_Object start, Lisp_Object end, Lisp_Object filename, |
| 4637 | Lisp_Object append, Lisp_Object visit, Lisp_Object lockname) |
| 4638 | { |
| 4639 | Lisp_Object val; |
| 4640 | Lisp_Object eol_parent = Qnil; |
| 4641 | |
| 4642 | /* Mimic write-region behavior. */ |
| 4643 | if (NILP (start)) |
| 4644 | { |
| 4645 | XSETFASTINT (start, BEGV); |
| 4646 | XSETFASTINT (end, ZV); |
| 4647 | } |
| 4648 | |
| 4649 | if (auto_saving |
| 4650 | && NILP (Fstring_equal (BVAR (current_buffer, filename), |
| 4651 | BVAR (current_buffer, auto_save_file_name)))) |
| 4652 | { |
| 4653 | val = Qutf_8_emacs; |
| 4654 | eol_parent = Qunix; |
| 4655 | } |
| 4656 | else if (!NILP (Vcoding_system_for_write)) |
| 4657 | { |
| 4658 | val = Vcoding_system_for_write; |
| 4659 | if (coding_system_require_warning |
| 4660 | && !NILP (Ffboundp (Vselect_safe_coding_system_function))) |
| 4661 | /* Confirm that VAL can surely encode the current region. */ |
| 4662 | val = call5 (Vselect_safe_coding_system_function, |
| 4663 | start, end, Fcons (Qt, Fcons (val, Qnil)), |
| 4664 | Qnil, filename); |
| 4665 | } |
| 4666 | else |
| 4667 | { |
| 4668 | /* If the variable `buffer-file-coding-system' is set locally, |
| 4669 | it means that the file was read with some kind of code |
| 4670 | conversion or the variable is explicitly set by users. We |
| 4671 | had better write it out with the same coding system even if |
| 4672 | `enable-multibyte-characters' is nil. |
| 4673 | |
| 4674 | If it is not set locally, we anyway have to convert EOL |
| 4675 | format if the default value of `buffer-file-coding-system' |
| 4676 | tells that it is not Unix-like (LF only) format. */ |
| 4677 | bool using_default_coding = 0; |
| 4678 | bool force_raw_text = 0; |
| 4679 | |
| 4680 | val = BVAR (current_buffer, buffer_file_coding_system); |
| 4681 | if (NILP (val) |
| 4682 | || NILP (Flocal_variable_p (Qbuffer_file_coding_system, Qnil))) |
| 4683 | { |
| 4684 | val = Qnil; |
| 4685 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 4686 | force_raw_text = 1; |
| 4687 | } |
| 4688 | |
| 4689 | if (NILP (val)) |
| 4690 | { |
| 4691 | /* Check file-coding-system-alist. */ |
| 4692 | Lisp_Object args[7], coding_systems; |
| 4693 | |
| 4694 | args[0] = Qwrite_region; args[1] = start; args[2] = end; |
| 4695 | args[3] = filename; args[4] = append; args[5] = visit; |
| 4696 | args[6] = lockname; |
| 4697 | coding_systems = Ffind_operation_coding_system (7, args); |
| 4698 | if (CONSP (coding_systems) && !NILP (XCDR (coding_systems))) |
| 4699 | val = XCDR (coding_systems); |
| 4700 | } |
| 4701 | |
| 4702 | if (NILP (val)) |
| 4703 | { |
| 4704 | /* If we still have not decided a coding system, use the |
| 4705 | default value of buffer-file-coding-system. */ |
| 4706 | val = BVAR (current_buffer, buffer_file_coding_system); |
| 4707 | using_default_coding = 1; |
| 4708 | } |
| 4709 | |
| 4710 | if (! NILP (val) && ! force_raw_text) |
| 4711 | { |
| 4712 | Lisp_Object spec, attrs; |
| 4713 | |
| 4714 | CHECK_CODING_SYSTEM_GET_SPEC (val, spec); |
| 4715 | attrs = AREF (spec, 0); |
| 4716 | if (EQ (CODING_ATTR_TYPE (attrs), Qraw_text)) |
| 4717 | force_raw_text = 1; |
| 4718 | } |
| 4719 | |
| 4720 | if (!force_raw_text |
| 4721 | && !NILP (Ffboundp (Vselect_safe_coding_system_function))) |
| 4722 | /* Confirm that VAL can surely encode the current region. */ |
| 4723 | val = call5 (Vselect_safe_coding_system_function, |
| 4724 | start, end, val, Qnil, filename); |
| 4725 | |
| 4726 | /* If the decided coding-system doesn't specify end-of-line |
| 4727 | format, we use that of |
| 4728 | `default-buffer-file-coding-system'. */ |
| 4729 | if (! using_default_coding |
| 4730 | && ! NILP (BVAR (&buffer_defaults, buffer_file_coding_system))) |
| 4731 | val = (coding_inherit_eol_type |
| 4732 | (val, BVAR (&buffer_defaults, buffer_file_coding_system))); |
| 4733 | |
| 4734 | /* If we decide not to encode text, use `raw-text' or one of its |
| 4735 | subsidiaries. */ |
| 4736 | if (force_raw_text) |
| 4737 | val = raw_text_coding_system (val); |
| 4738 | } |
| 4739 | |
| 4740 | val = coding_inherit_eol_type (val, eol_parent); |
| 4741 | return val; |
| 4742 | } |
| 4743 | |
| 4744 | DEFUN ("write-region", Fwrite_region, Swrite_region, 3, 7, |
| 4745 | "r\nFWrite region to file: \ni\ni\ni\np", |
| 4746 | doc: /* Write current region into specified file. |
| 4747 | When called from a program, requires three arguments: |
| 4748 | START, END and FILENAME. START and END are normally buffer positions |
| 4749 | specifying the part of the buffer to write. |
| 4750 | If START is nil, that means to use the entire buffer contents. |
| 4751 | If START is a string, then output that string to the file |
| 4752 | instead of any buffer contents; END is ignored. |
| 4753 | |
| 4754 | Optional fourth argument APPEND if non-nil means |
| 4755 | append to existing file contents (if any). If it is a number, |
| 4756 | seek to that offset in the file before writing. |
| 4757 | Optional fifth argument VISIT, if t or a string, means |
| 4758 | set the last-save-file-modtime of buffer to this file's modtime |
| 4759 | and mark buffer not modified. |
| 4760 | If VISIT is a string, it is a second file name; |
| 4761 | the output goes to FILENAME, but the buffer is marked as visiting VISIT. |
| 4762 | VISIT is also the file name to lock and unlock for clash detection. |
| 4763 | If VISIT is neither t nor nil nor a string, |
| 4764 | that means do not display the \"Wrote file\" message. |
| 4765 | The optional sixth arg LOCKNAME, if non-nil, specifies the name to |
| 4766 | use for locking and unlocking, overriding FILENAME and VISIT. |
| 4767 | The optional seventh arg MUSTBENEW, if non-nil, insists on a check |
| 4768 | for an existing file with the same name. If MUSTBENEW is `excl', |
| 4769 | that means to get an error if the file already exists; never overwrite. |
| 4770 | If MUSTBENEW is neither nil nor `excl', that means ask for |
| 4771 | confirmation before overwriting, but do go ahead and overwrite the file |
| 4772 | if the user confirms. |
| 4773 | |
| 4774 | This does code conversion according to the value of |
| 4775 | `coding-system-for-write', `buffer-file-coding-system', or |
| 4776 | `file-coding-system-alist', and sets the variable |
| 4777 | `last-coding-system-used' to the coding system actually used. |
| 4778 | |
| 4779 | This calls `write-region-annotate-functions' at the start, and |
| 4780 | `write-region-post-annotation-function' at the end. */) |
| 4781 | (Lisp_Object start, Lisp_Object end, Lisp_Object filename, Lisp_Object append, Lisp_Object visit, Lisp_Object lockname, Lisp_Object mustbenew) |
| 4782 | { |
| 4783 | int desc; |
| 4784 | int open_flags; |
| 4785 | int mode; |
| 4786 | off_t offset IF_LINT (= 0); |
| 4787 | bool ok; |
| 4788 | int save_errno = 0; |
| 4789 | const char *fn; |
| 4790 | struct stat st; |
| 4791 | EMACS_TIME modtime; |
| 4792 | ptrdiff_t count = SPECPDL_INDEX (); |
| 4793 | int count1; |
| 4794 | Lisp_Object handler; |
| 4795 | Lisp_Object visit_file; |
| 4796 | Lisp_Object annotations; |
| 4797 | Lisp_Object encoded_filename; |
| 4798 | bool visiting = (EQ (visit, Qt) || STRINGP (visit)); |
| 4799 | bool quietly = !NILP (visit); |
| 4800 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5; |
| 4801 | struct buffer *given_buffer; |
| 4802 | struct coding_system coding; |
| 4803 | |
| 4804 | if (current_buffer->base_buffer && visiting) |
| 4805 | error ("Cannot do file visiting in an indirect buffer"); |
| 4806 | |
| 4807 | if (!NILP (start) && !STRINGP (start)) |
| 4808 | validate_region (&start, &end); |
| 4809 | |
| 4810 | visit_file = Qnil; |
| 4811 | GCPRO5 (start, filename, visit, visit_file, lockname); |
| 4812 | |
| 4813 | filename = Fexpand_file_name (filename, Qnil); |
| 4814 | |
| 4815 | if (!NILP (mustbenew) && !EQ (mustbenew, Qexcl)) |
| 4816 | barf_or_query_if_file_exists (filename, "overwrite", 1, 0, 1); |
| 4817 | |
| 4818 | if (STRINGP (visit)) |
| 4819 | visit_file = Fexpand_file_name (visit, Qnil); |
| 4820 | else |
| 4821 | visit_file = filename; |
| 4822 | |
| 4823 | if (NILP (lockname)) |
| 4824 | lockname = visit_file; |
| 4825 | |
| 4826 | annotations = Qnil; |
| 4827 | |
| 4828 | /* If the file name has special constructs in it, |
| 4829 | call the corresponding file handler. */ |
| 4830 | handler = Ffind_file_name_handler (filename, Qwrite_region); |
| 4831 | /* If FILENAME has no handler, see if VISIT has one. */ |
| 4832 | if (NILP (handler) && STRINGP (visit)) |
| 4833 | handler = Ffind_file_name_handler (visit, Qwrite_region); |
| 4834 | |
| 4835 | if (!NILP (handler)) |
| 4836 | { |
| 4837 | Lisp_Object val; |
| 4838 | val = call6 (handler, Qwrite_region, start, end, |
| 4839 | filename, append, visit); |
| 4840 | |
| 4841 | if (visiting) |
| 4842 | { |
| 4843 | SAVE_MODIFF = MODIFF; |
| 4844 | XSETFASTINT (BVAR (current_buffer, save_length), Z - BEG); |
| 4845 | bset_filename (current_buffer, visit_file); |
| 4846 | } |
| 4847 | UNGCPRO; |
| 4848 | return val; |
| 4849 | } |
| 4850 | |
| 4851 | record_unwind_protect (save_restriction_restore, save_restriction_save ()); |
| 4852 | |
| 4853 | /* Special kludge to simplify auto-saving. */ |
| 4854 | if (NILP (start)) |
| 4855 | { |
| 4856 | /* Do it later, so write-region-annotate-function can work differently |
| 4857 | if we save "the buffer" vs "a region". |
| 4858 | This is useful in tar-mode. --Stef |
| 4859 | XSETFASTINT (start, BEG); |
| 4860 | XSETFASTINT (end, Z); */ |
| 4861 | Fwiden (); |
| 4862 | } |
| 4863 | |
| 4864 | record_unwind_protect (build_annotations_unwind, |
| 4865 | Vwrite_region_annotation_buffers); |
| 4866 | Vwrite_region_annotation_buffers = Fcons (Fcurrent_buffer (), Qnil); |
| 4867 | count1 = SPECPDL_INDEX (); |
| 4868 | |
| 4869 | given_buffer = current_buffer; |
| 4870 | |
| 4871 | if (!STRINGP (start)) |
| 4872 | { |
| 4873 | annotations = build_annotations (start, end); |
| 4874 | |
| 4875 | if (current_buffer != given_buffer) |
| 4876 | { |
| 4877 | XSETFASTINT (start, BEGV); |
| 4878 | XSETFASTINT (end, ZV); |
| 4879 | } |
| 4880 | } |
| 4881 | |
| 4882 | if (NILP (start)) |
| 4883 | { |
| 4884 | XSETFASTINT (start, BEGV); |
| 4885 | XSETFASTINT (end, ZV); |
| 4886 | } |
| 4887 | |
| 4888 | UNGCPRO; |
| 4889 | |
| 4890 | GCPRO5 (start, filename, annotations, visit_file, lockname); |
| 4891 | |
| 4892 | /* Decide the coding-system to encode the data with. |
| 4893 | We used to make this choice before calling build_annotations, but that |
| 4894 | leads to problems when a write-annotate-function takes care of |
| 4895 | unsavable chars (as was the case with X-Symbol). */ |
| 4896 | Vlast_coding_system_used = |
| 4897 | Fchoose_write_coding_system (start, end, filename, |
| 4898 | append, visit, lockname); |
| 4899 | |
| 4900 | setup_coding_system (Vlast_coding_system_used, &coding); |
| 4901 | |
| 4902 | if (!STRINGP (start) && !NILP (BVAR (current_buffer, selective_display))) |
| 4903 | coding.mode |= CODING_MODE_SELECTIVE_DISPLAY; |
| 4904 | |
| 4905 | #ifdef CLASH_DETECTION |
| 4906 | if (!auto_saving) |
| 4907 | lock_file (lockname); |
| 4908 | #endif /* CLASH_DETECTION */ |
| 4909 | |
| 4910 | encoded_filename = ENCODE_FILE (filename); |
| 4911 | fn = SSDATA (encoded_filename); |
| 4912 | open_flags = O_WRONLY | O_BINARY | O_CREAT; |
| 4913 | open_flags |= EQ (mustbenew, Qexcl) ? O_EXCL : !NILP (append) ? 0 : O_TRUNC; |
| 4914 | if (NUMBERP (append)) |
| 4915 | offset = file_offset (append); |
| 4916 | else if (!NILP (append)) |
| 4917 | open_flags |= O_APPEND; |
| 4918 | #ifdef DOS_NT |
| 4919 | mode = S_IREAD | S_IWRITE; |
| 4920 | #else |
| 4921 | mode = auto_saving ? auto_save_mode_bits : 0666; |
| 4922 | #endif |
| 4923 | |
| 4924 | desc = emacs_open (fn, open_flags, mode); |
| 4925 | |
| 4926 | if (desc < 0) |
| 4927 | { |
| 4928 | #ifdef CLASH_DETECTION |
| 4929 | save_errno = errno; |
| 4930 | if (!auto_saving) unlock_file (lockname); |
| 4931 | errno = save_errno; |
| 4932 | #endif /* CLASH_DETECTION */ |
| 4933 | UNGCPRO; |
| 4934 | report_file_error ("Opening output file", Fcons (filename, Qnil)); |
| 4935 | } |
| 4936 | |
| 4937 | record_unwind_protect (close_file_unwind, make_number (desc)); |
| 4938 | |
| 4939 | if (NUMBERP (append)) |
| 4940 | { |
| 4941 | off_t ret = lseek (desc, offset, SEEK_SET); |
| 4942 | if (ret < 0) |
| 4943 | { |
| 4944 | #ifdef CLASH_DETECTION |
| 4945 | save_errno = errno; |
| 4946 | if (!auto_saving) unlock_file (lockname); |
| 4947 | errno = save_errno; |
| 4948 | #endif /* CLASH_DETECTION */ |
| 4949 | UNGCPRO; |
| 4950 | report_file_error ("Lseek error", Fcons (filename, Qnil)); |
| 4951 | } |
| 4952 | } |
| 4953 | |
| 4954 | UNGCPRO; |
| 4955 | |
| 4956 | immediate_quit = 1; |
| 4957 | |
| 4958 | if (STRINGP (start)) |
| 4959 | ok = a_write (desc, start, 0, SCHARS (start), &annotations, &coding); |
| 4960 | else if (XINT (start) != XINT (end)) |
| 4961 | ok = a_write (desc, Qnil, XINT (start), XINT (end) - XINT (start), |
| 4962 | &annotations, &coding); |
| 4963 | else |
| 4964 | { |
| 4965 | /* If file was empty, still need to write the annotations. */ |
| 4966 | coding.mode |= CODING_MODE_LAST_BLOCK; |
| 4967 | ok = a_write (desc, Qnil, XINT (end), 0, &annotations, &coding); |
| 4968 | } |
| 4969 | save_errno = errno; |
| 4970 | |
| 4971 | if (ok && CODING_REQUIRE_FLUSHING (&coding) |
| 4972 | && !(coding.mode & CODING_MODE_LAST_BLOCK)) |
| 4973 | { |
| 4974 | /* We have to flush out a data. */ |
| 4975 | coding.mode |= CODING_MODE_LAST_BLOCK; |
| 4976 | ok = e_write (desc, Qnil, 1, 1, &coding); |
| 4977 | save_errno = errno; |
| 4978 | } |
| 4979 | |
| 4980 | immediate_quit = 0; |
| 4981 | |
| 4982 | #ifdef HAVE_FSYNC |
| 4983 | /* Note fsync appears to change the modtime on BSD4.2 (both vax and sun). |
| 4984 | Disk full in NFS may be reported here. */ |
| 4985 | /* mib says that closing the file will try to write as fast as NFS can do |
| 4986 | it, and that means the fsync here is not crucial for autosave files. */ |
| 4987 | if (!auto_saving && !write_region_inhibit_fsync && fsync (desc) < 0) |
| 4988 | { |
| 4989 | /* If fsync fails with EINTR, don't treat that as serious. Also |
| 4990 | ignore EINVAL which happens when fsync is not supported on this |
| 4991 | file. */ |
| 4992 | if (errno != EINTR && errno != EINVAL) |
| 4993 | ok = 0, save_errno = errno; |
| 4994 | } |
| 4995 | #endif |
| 4996 | |
| 4997 | modtime = invalid_emacs_time (); |
| 4998 | if (visiting) |
| 4999 | { |
| 5000 | if (fstat (desc, &st) == 0) |
| 5001 | modtime = get_stat_mtime (&st); |
| 5002 | else |
| 5003 | ok = 0, save_errno = errno; |
| 5004 | } |
| 5005 | |
| 5006 | /* NFS can report a write failure now. */ |
| 5007 | if (emacs_close (desc) < 0) |
| 5008 | ok = 0, save_errno = errno; |
| 5009 | |
| 5010 | /* Discard the unwind protect for close_file_unwind. */ |
| 5011 | specpdl_ptr = specpdl + count1; |
| 5012 | |
| 5013 | /* Some file systems have a bug where st_mtime is not updated |
| 5014 | properly after a write. For example, CIFS might not see the |
| 5015 | st_mtime change until after the file is opened again. |
| 5016 | |
| 5017 | Attempt to detect this file system bug, and update MODTIME to the |
| 5018 | newer st_mtime if the bug appears to be present. This introduces |
| 5019 | a race condition, so to avoid most instances of the race condition |
| 5020 | on non-buggy file systems, skip this check if the most recently |
| 5021 | encountered non-buggy file system was the current file system. |
| 5022 | |
| 5023 | A race condition can occur if some other process modifies the |
| 5024 | file between the fstat above and the fstat below, but the race is |
| 5025 | unlikely and a similar race between the last write and the fstat |
| 5026 | above cannot possibly be closed anyway. */ |
| 5027 | |
| 5028 | if (EMACS_TIME_VALID_P (modtime) |
| 5029 | && ! (valid_timestamp_file_system && st.st_dev == timestamp_file_system)) |
| 5030 | { |
| 5031 | int desc1 = emacs_open (fn, O_WRONLY | O_BINARY, 0); |
| 5032 | if (0 <= desc1) |
| 5033 | { |
| 5034 | struct stat st1; |
| 5035 | if (fstat (desc1, &st1) == 0 |
| 5036 | && st.st_dev == st1.st_dev && st.st_ino == st1.st_ino) |
| 5037 | { |
| 5038 | EMACS_TIME modtime1 = get_stat_mtime (&st1); |
| 5039 | /* If neither O_EXCL nor O_TRUNC is used, and Emacs happened to |
| 5040 | write nothing to the file, the file's time stamp won't change |
| 5041 | so it should not be used in this heuristic. */ |
| 5042 | if ((open_flags & (O_EXCL | O_TRUNC)) != 0 |
| 5043 | && EMACS_TIME_EQ (modtime, modtime1) |
| 5044 | && st.st_size == st1.st_size) |
| 5045 | { |
| 5046 | timestamp_file_system = st.st_dev; |
| 5047 | valid_timestamp_file_system = 1; |
| 5048 | } |
| 5049 | else |
| 5050 | { |
| 5051 | st.st_size = st1.st_size; |
| 5052 | modtime = modtime1; |
| 5053 | } |
| 5054 | } |
| 5055 | emacs_close (desc1); |
| 5056 | } |
| 5057 | } |
| 5058 | |
| 5059 | /* Call write-region-post-annotation-function. */ |
| 5060 | while (CONSP (Vwrite_region_annotation_buffers)) |
| 5061 | { |
| 5062 | Lisp_Object buf = XCAR (Vwrite_region_annotation_buffers); |
| 5063 | if (!NILP (Fbuffer_live_p (buf))) |
| 5064 | { |
| 5065 | Fset_buffer (buf); |
| 5066 | if (FUNCTIONP (Vwrite_region_post_annotation_function)) |
| 5067 | call0 (Vwrite_region_post_annotation_function); |
| 5068 | } |
| 5069 | Vwrite_region_annotation_buffers |
| 5070 | = XCDR (Vwrite_region_annotation_buffers); |
| 5071 | } |
| 5072 | |
| 5073 | unbind_to (count, Qnil); |
| 5074 | |
| 5075 | #ifdef CLASH_DETECTION |
| 5076 | if (!auto_saving) |
| 5077 | unlock_file (lockname); |
| 5078 | #endif /* CLASH_DETECTION */ |
| 5079 | |
| 5080 | /* Do this before reporting IO error |
| 5081 | to avoid a "file has changed on disk" warning on |
| 5082 | next attempt to save. */ |
| 5083 | if (EMACS_TIME_VALID_P (modtime)) |
| 5084 | { |
| 5085 | current_buffer->modtime = modtime; |
| 5086 | current_buffer->modtime_size = st.st_size; |
| 5087 | } |
| 5088 | |
| 5089 | if (! ok) |
| 5090 | error ("IO error writing %s: %s", SDATA (filename), |
| 5091 | emacs_strerror (save_errno)); |
| 5092 | |
| 5093 | if (visiting) |
| 5094 | { |
| 5095 | SAVE_MODIFF = MODIFF; |
| 5096 | XSETFASTINT (BVAR (current_buffer, save_length), Z - BEG); |
| 5097 | bset_filename (current_buffer, visit_file); |
| 5098 | update_mode_lines++; |
| 5099 | } |
| 5100 | else if (quietly) |
| 5101 | { |
| 5102 | if (auto_saving |
| 5103 | && ! NILP (Fstring_equal (BVAR (current_buffer, filename), |
| 5104 | BVAR (current_buffer, auto_save_file_name)))) |
| 5105 | SAVE_MODIFF = MODIFF; |
| 5106 | |
| 5107 | return Qnil; |
| 5108 | } |
| 5109 | |
| 5110 | if (!auto_saving) |
| 5111 | message_with_string ((NUMBERP (append) |
| 5112 | ? "Updated %s" |
| 5113 | : ! NILP (append) |
| 5114 | ? "Added to %s" |
| 5115 | : "Wrote %s"), |
| 5116 | visit_file, 1); |
| 5117 | |
| 5118 | return Qnil; |
| 5119 | } |
| 5120 | \f |
| 5121 | Lisp_Object merge (Lisp_Object, Lisp_Object, Lisp_Object); |
| 5122 | |
| 5123 | DEFUN ("car-less-than-car", Fcar_less_than_car, Scar_less_than_car, 2, 2, 0, |
| 5124 | doc: /* Return t if (car A) is numerically less than (car B). */) |
| 5125 | (Lisp_Object a, Lisp_Object b) |
| 5126 | { |
| 5127 | return Flss (Fcar (a), Fcar (b)); |
| 5128 | } |
| 5129 | |
| 5130 | /* Build the complete list of annotations appropriate for writing out |
| 5131 | the text between START and END, by calling all the functions in |
| 5132 | write-region-annotate-functions and merging the lists they return. |
| 5133 | If one of these functions switches to a different buffer, we assume |
| 5134 | that buffer contains altered text. Therefore, the caller must |
| 5135 | make sure to restore the current buffer in all cases, |
| 5136 | as save-excursion would do. */ |
| 5137 | |
| 5138 | static Lisp_Object |
| 5139 | build_annotations (Lisp_Object start, Lisp_Object end) |
| 5140 | { |
| 5141 | Lisp_Object annotations; |
| 5142 | Lisp_Object p, res; |
| 5143 | struct gcpro gcpro1, gcpro2; |
| 5144 | Lisp_Object original_buffer; |
| 5145 | int i; |
| 5146 | bool used_global = 0; |
| 5147 | |
| 5148 | XSETBUFFER (original_buffer, current_buffer); |
| 5149 | |
| 5150 | annotations = Qnil; |
| 5151 | p = Vwrite_region_annotate_functions; |
| 5152 | GCPRO2 (annotations, p); |
| 5153 | while (CONSP (p)) |
| 5154 | { |
| 5155 | struct buffer *given_buffer = current_buffer; |
| 5156 | if (EQ (Qt, XCAR (p)) && !used_global) |
| 5157 | { /* Use the global value of the hook. */ |
| 5158 | Lisp_Object arg[2]; |
| 5159 | used_global = 1; |
| 5160 | arg[0] = Fdefault_value (Qwrite_region_annotate_functions); |
| 5161 | arg[1] = XCDR (p); |
| 5162 | p = Fappend (2, arg); |
| 5163 | continue; |
| 5164 | } |
| 5165 | Vwrite_region_annotations_so_far = annotations; |
| 5166 | res = call2 (XCAR (p), start, end); |
| 5167 | /* If the function makes a different buffer current, |
| 5168 | assume that means this buffer contains altered text to be output. |
| 5169 | Reset START and END from the buffer bounds |
| 5170 | and discard all previous annotations because they should have |
| 5171 | been dealt with by this function. */ |
| 5172 | if (current_buffer != given_buffer) |
| 5173 | { |
| 5174 | Vwrite_region_annotation_buffers |
| 5175 | = Fcons (Fcurrent_buffer (), |
| 5176 | Vwrite_region_annotation_buffers); |
| 5177 | XSETFASTINT (start, BEGV); |
| 5178 | XSETFASTINT (end, ZV); |
| 5179 | annotations = Qnil; |
| 5180 | } |
| 5181 | Flength (res); /* Check basic validity of return value */ |
| 5182 | annotations = merge (annotations, res, Qcar_less_than_car); |
| 5183 | p = XCDR (p); |
| 5184 | } |
| 5185 | |
| 5186 | /* Now do the same for annotation functions implied by the file-format */ |
| 5187 | if (auto_saving && (!EQ (BVAR (current_buffer, auto_save_file_format), Qt))) |
| 5188 | p = BVAR (current_buffer, auto_save_file_format); |
| 5189 | else |
| 5190 | p = BVAR (current_buffer, file_format); |
| 5191 | for (i = 0; CONSP (p); p = XCDR (p), ++i) |
| 5192 | { |
| 5193 | struct buffer *given_buffer = current_buffer; |
| 5194 | |
| 5195 | Vwrite_region_annotations_so_far = annotations; |
| 5196 | |
| 5197 | /* Value is either a list of annotations or nil if the function |
| 5198 | has written annotations to a temporary buffer, which is now |
| 5199 | current. */ |
| 5200 | res = call5 (Qformat_annotate_function, XCAR (p), start, end, |
| 5201 | original_buffer, make_number (i)); |
| 5202 | if (current_buffer != given_buffer) |
| 5203 | { |
| 5204 | XSETFASTINT (start, BEGV); |
| 5205 | XSETFASTINT (end, ZV); |
| 5206 | annotations = Qnil; |
| 5207 | } |
| 5208 | |
| 5209 | if (CONSP (res)) |
| 5210 | annotations = merge (annotations, res, Qcar_less_than_car); |
| 5211 | } |
| 5212 | |
| 5213 | UNGCPRO; |
| 5214 | return annotations; |
| 5215 | } |
| 5216 | |
| 5217 | \f |
| 5218 | /* Write to descriptor DESC the NCHARS chars starting at POS of STRING. |
| 5219 | If STRING is nil, POS is the character position in the current buffer. |
| 5220 | Intersperse with them the annotations from *ANNOT |
| 5221 | which fall within the range of POS to POS + NCHARS, |
| 5222 | each at its appropriate position. |
| 5223 | |
| 5224 | We modify *ANNOT by discarding elements as we use them up. |
| 5225 | |
| 5226 | Return true if successful. */ |
| 5227 | |
| 5228 | static bool |
| 5229 | a_write (int desc, Lisp_Object string, ptrdiff_t pos, |
| 5230 | ptrdiff_t nchars, Lisp_Object *annot, |
| 5231 | struct coding_system *coding) |
| 5232 | { |
| 5233 | Lisp_Object tem; |
| 5234 | ptrdiff_t nextpos; |
| 5235 | ptrdiff_t lastpos = pos + nchars; |
| 5236 | |
| 5237 | while (NILP (*annot) || CONSP (*annot)) |
| 5238 | { |
| 5239 | tem = Fcar_safe (Fcar (*annot)); |
| 5240 | nextpos = pos - 1; |
| 5241 | if (INTEGERP (tem)) |
| 5242 | nextpos = XFASTINT (tem); |
| 5243 | |
| 5244 | /* If there are no more annotations in this range, |
| 5245 | output the rest of the range all at once. */ |
| 5246 | if (! (nextpos >= pos && nextpos <= lastpos)) |
| 5247 | return e_write (desc, string, pos, lastpos, coding); |
| 5248 | |
| 5249 | /* Output buffer text up to the next annotation's position. */ |
| 5250 | if (nextpos > pos) |
| 5251 | { |
| 5252 | if (!e_write (desc, string, pos, nextpos, coding)) |
| 5253 | return 0; |
| 5254 | pos = nextpos; |
| 5255 | } |
| 5256 | /* Output the annotation. */ |
| 5257 | tem = Fcdr (Fcar (*annot)); |
| 5258 | if (STRINGP (tem)) |
| 5259 | { |
| 5260 | if (!e_write (desc, tem, 0, SCHARS (tem), coding)) |
| 5261 | return 0; |
| 5262 | } |
| 5263 | *annot = Fcdr (*annot); |
| 5264 | } |
| 5265 | return 1; |
| 5266 | } |
| 5267 | |
| 5268 | |
| 5269 | /* Write text in the range START and END into descriptor DESC, |
| 5270 | encoding them with coding system CODING. If STRING is nil, START |
| 5271 | and END are character positions of the current buffer, else they |
| 5272 | are indexes to the string STRING. Return true if successful. */ |
| 5273 | |
| 5274 | static bool |
| 5275 | e_write (int desc, Lisp_Object string, ptrdiff_t start, ptrdiff_t end, |
| 5276 | struct coding_system *coding) |
| 5277 | { |
| 5278 | if (STRINGP (string)) |
| 5279 | { |
| 5280 | start = 0; |
| 5281 | end = SCHARS (string); |
| 5282 | } |
| 5283 | |
| 5284 | /* We used to have a code for handling selective display here. But, |
| 5285 | now it is handled within encode_coding. */ |
| 5286 | |
| 5287 | while (start < end) |
| 5288 | { |
| 5289 | if (STRINGP (string)) |
| 5290 | { |
| 5291 | coding->src_multibyte = SCHARS (string) < SBYTES (string); |
| 5292 | if (CODING_REQUIRE_ENCODING (coding)) |
| 5293 | { |
| 5294 | encode_coding_object (coding, string, |
| 5295 | start, string_char_to_byte (string, start), |
| 5296 | end, string_char_to_byte (string, end), Qt); |
| 5297 | } |
| 5298 | else |
| 5299 | { |
| 5300 | coding->dst_object = string; |
| 5301 | coding->consumed_char = SCHARS (string); |
| 5302 | coding->produced = SBYTES (string); |
| 5303 | } |
| 5304 | } |
| 5305 | else |
| 5306 | { |
| 5307 | ptrdiff_t start_byte = CHAR_TO_BYTE (start); |
| 5308 | ptrdiff_t end_byte = CHAR_TO_BYTE (end); |
| 5309 | |
| 5310 | coding->src_multibyte = (end - start) < (end_byte - start_byte); |
| 5311 | if (CODING_REQUIRE_ENCODING (coding)) |
| 5312 | { |
| 5313 | encode_coding_object (coding, Fcurrent_buffer (), |
| 5314 | start, start_byte, end, end_byte, Qt); |
| 5315 | } |
| 5316 | else |
| 5317 | { |
| 5318 | coding->dst_object = Qnil; |
| 5319 | coding->dst_pos_byte = start_byte; |
| 5320 | if (start >= GPT || end <= GPT) |
| 5321 | { |
| 5322 | coding->consumed_char = end - start; |
| 5323 | coding->produced = end_byte - start_byte; |
| 5324 | } |
| 5325 | else |
| 5326 | { |
| 5327 | coding->consumed_char = GPT - start; |
| 5328 | coding->produced = GPT_BYTE - start_byte; |
| 5329 | } |
| 5330 | } |
| 5331 | } |
| 5332 | |
| 5333 | if (coding->produced > 0) |
| 5334 | { |
| 5335 | coding->produced |
| 5336 | -= emacs_write (desc, |
| 5337 | STRINGP (coding->dst_object) |
| 5338 | ? SSDATA (coding->dst_object) |
| 5339 | : (char *) BYTE_POS_ADDR (coding->dst_pos_byte), |
| 5340 | coding->produced); |
| 5341 | |
| 5342 | if (coding->produced) |
| 5343 | return 0; |
| 5344 | } |
| 5345 | start += coding->consumed_char; |
| 5346 | } |
| 5347 | |
| 5348 | return 1; |
| 5349 | } |
| 5350 | \f |
| 5351 | DEFUN ("verify-visited-file-modtime", Fverify_visited_file_modtime, |
| 5352 | Sverify_visited_file_modtime, 0, 1, 0, |
| 5353 | doc: /* Return t if last mod time of BUF's visited file matches what BUF records. |
| 5354 | This means that the file has not been changed since it was visited or saved. |
| 5355 | If BUF is omitted or nil, it defaults to the current buffer. |
| 5356 | See Info node `(elisp)Modification Time' for more details. */) |
| 5357 | (Lisp_Object buf) |
| 5358 | { |
| 5359 | struct buffer *b; |
| 5360 | struct stat st; |
| 5361 | Lisp_Object handler; |
| 5362 | Lisp_Object filename; |
| 5363 | EMACS_TIME mtime; |
| 5364 | |
| 5365 | if (NILP (buf)) |
| 5366 | b = current_buffer; |
| 5367 | else |
| 5368 | { |
| 5369 | CHECK_BUFFER (buf); |
| 5370 | b = XBUFFER (buf); |
| 5371 | } |
| 5372 | |
| 5373 | if (!STRINGP (BVAR (b, filename))) return Qt; |
| 5374 | if (EMACS_NSECS (b->modtime) == UNKNOWN_MODTIME_NSECS) return Qt; |
| 5375 | |
| 5376 | /* If the file name has special constructs in it, |
| 5377 | call the corresponding file handler. */ |
| 5378 | handler = Ffind_file_name_handler (BVAR (b, filename), |
| 5379 | Qverify_visited_file_modtime); |
| 5380 | if (!NILP (handler)) |
| 5381 | return call2 (handler, Qverify_visited_file_modtime, buf); |
| 5382 | |
| 5383 | filename = ENCODE_FILE (BVAR (b, filename)); |
| 5384 | |
| 5385 | mtime = (stat (SSDATA (filename), &st) == 0 |
| 5386 | ? get_stat_mtime (&st) |
| 5387 | : time_error_value (errno)); |
| 5388 | if (EMACS_TIME_EQ (mtime, b->modtime) |
| 5389 | && (b->modtime_size < 0 |
| 5390 | || st.st_size == b->modtime_size)) |
| 5391 | return Qt; |
| 5392 | return Qnil; |
| 5393 | } |
| 5394 | |
| 5395 | DEFUN ("clear-visited-file-modtime", Fclear_visited_file_modtime, |
| 5396 | Sclear_visited_file_modtime, 0, 0, 0, |
| 5397 | doc: /* Clear out records of last mod time of visited file. |
| 5398 | Next attempt to save will certainly not complain of a discrepancy. */) |
| 5399 | (void) |
| 5400 | { |
| 5401 | current_buffer->modtime = make_emacs_time (0, UNKNOWN_MODTIME_NSECS); |
| 5402 | current_buffer->modtime_size = -1; |
| 5403 | return Qnil; |
| 5404 | } |
| 5405 | |
| 5406 | DEFUN ("visited-file-modtime", Fvisited_file_modtime, |
| 5407 | Svisited_file_modtime, 0, 0, 0, |
| 5408 | doc: /* Return the current buffer's recorded visited file modification time. |
| 5409 | The value is a list of the form (HIGH LOW USEC PSEC), like the time values that |
| 5410 | `file-attributes' returns. If the current buffer has no recorded file |
| 5411 | modification time, this function returns 0. If the visited file |
| 5412 | doesn't exist, HIGH will be -1. |
| 5413 | See Info node `(elisp)Modification Time' for more details. */) |
| 5414 | (void) |
| 5415 | { |
| 5416 | if (EMACS_NSECS (current_buffer->modtime) < 0) |
| 5417 | { |
| 5418 | if (EMACS_NSECS (current_buffer->modtime) == NONEXISTENT_MODTIME_NSECS) |
| 5419 | { |
| 5420 | /* make_lisp_time won't work here if time_t is unsigned. */ |
| 5421 | return list4 (make_number (-1), make_number (65535), |
| 5422 | make_number (0), make_number (0)); |
| 5423 | } |
| 5424 | return make_number (0); |
| 5425 | } |
| 5426 | return make_lisp_time (current_buffer->modtime); |
| 5427 | } |
| 5428 | |
| 5429 | DEFUN ("set-visited-file-modtime", Fset_visited_file_modtime, |
| 5430 | Sset_visited_file_modtime, 0, 1, 0, |
| 5431 | doc: /* Update buffer's recorded modification time from the visited file's time. |
| 5432 | Useful if the buffer was not read from the file normally |
| 5433 | or if the file itself has been changed for some known benign reason. |
| 5434 | An argument specifies the modification time value to use |
| 5435 | \(instead of that of the visited file), in the form of a list |
| 5436 | \(HIGH LOW USEC PSEC) as returned by `current-time'. */) |
| 5437 | (Lisp_Object time_list) |
| 5438 | { |
| 5439 | if (!NILP (time_list)) |
| 5440 | { |
| 5441 | current_buffer->modtime = lisp_time_argument (time_list); |
| 5442 | current_buffer->modtime_size = -1; |
| 5443 | } |
| 5444 | else |
| 5445 | { |
| 5446 | register Lisp_Object filename; |
| 5447 | struct stat st; |
| 5448 | Lisp_Object handler; |
| 5449 | |
| 5450 | filename = Fexpand_file_name (BVAR (current_buffer, filename), Qnil); |
| 5451 | |
| 5452 | /* If the file name has special constructs in it, |
| 5453 | call the corresponding file handler. */ |
| 5454 | handler = Ffind_file_name_handler (filename, Qset_visited_file_modtime); |
| 5455 | if (!NILP (handler)) |
| 5456 | /* The handler can find the file name the same way we did. */ |
| 5457 | return call2 (handler, Qset_visited_file_modtime, Qnil); |
| 5458 | |
| 5459 | filename = ENCODE_FILE (filename); |
| 5460 | |
| 5461 | if (stat (SSDATA (filename), &st) >= 0) |
| 5462 | { |
| 5463 | current_buffer->modtime = get_stat_mtime (&st); |
| 5464 | current_buffer->modtime_size = st.st_size; |
| 5465 | } |
| 5466 | } |
| 5467 | |
| 5468 | return Qnil; |
| 5469 | } |
| 5470 | \f |
| 5471 | static Lisp_Object |
| 5472 | auto_save_error (Lisp_Object error_val) |
| 5473 | { |
| 5474 | Lisp_Object args[3], msg; |
| 5475 | int i; |
| 5476 | struct gcpro gcpro1; |
| 5477 | |
| 5478 | auto_save_error_occurred = 1; |
| 5479 | |
| 5480 | ring_bell (XFRAME (selected_frame)); |
| 5481 | |
| 5482 | args[0] = build_string ("Auto-saving %s: %s"); |
| 5483 | args[1] = BVAR (current_buffer, name); |
| 5484 | args[2] = Ferror_message_string (error_val); |
| 5485 | msg = Fformat (3, args); |
| 5486 | GCPRO1 (msg); |
| 5487 | |
| 5488 | for (i = 0; i < 3; ++i) |
| 5489 | { |
| 5490 | if (i == 0) |
| 5491 | message3 (msg); |
| 5492 | else |
| 5493 | message3_nolog (msg); |
| 5494 | Fsleep_for (make_number (1), Qnil); |
| 5495 | } |
| 5496 | |
| 5497 | UNGCPRO; |
| 5498 | return Qnil; |
| 5499 | } |
| 5500 | |
| 5501 | static Lisp_Object |
| 5502 | auto_save_1 (void) |
| 5503 | { |
| 5504 | struct stat st; |
| 5505 | Lisp_Object modes; |
| 5506 | |
| 5507 | auto_save_mode_bits = 0666; |
| 5508 | |
| 5509 | /* Get visited file's mode to become the auto save file's mode. */ |
| 5510 | if (! NILP (BVAR (current_buffer, filename))) |
| 5511 | { |
| 5512 | if (stat (SSDATA (BVAR (current_buffer, filename)), &st) >= 0) |
| 5513 | /* But make sure we can overwrite it later! */ |
| 5514 | auto_save_mode_bits = (st.st_mode | 0600) & 0777; |
| 5515 | else if (modes = Ffile_modes (BVAR (current_buffer, filename)), |
| 5516 | INTEGERP (modes)) |
| 5517 | /* Remote files don't cooperate with stat. */ |
| 5518 | auto_save_mode_bits = (XINT (modes) | 0600) & 0777; |
| 5519 | } |
| 5520 | |
| 5521 | return |
| 5522 | Fwrite_region (Qnil, Qnil, BVAR (current_buffer, auto_save_file_name), Qnil, |
| 5523 | NILP (Vauto_save_visited_file_name) ? Qlambda : Qt, |
| 5524 | Qnil, Qnil); |
| 5525 | } |
| 5526 | |
| 5527 | static Lisp_Object |
| 5528 | do_auto_save_unwind (Lisp_Object arg) /* used as unwind-protect function */ |
| 5529 | |
| 5530 | { |
| 5531 | FILE *stream = XSAVE_POINTER (arg, 0); |
| 5532 | auto_saving = 0; |
| 5533 | if (stream != NULL) |
| 5534 | { |
| 5535 | block_input (); |
| 5536 | fclose (stream); |
| 5537 | unblock_input (); |
| 5538 | } |
| 5539 | return Qnil; |
| 5540 | } |
| 5541 | |
| 5542 | static Lisp_Object |
| 5543 | do_auto_save_unwind_1 (Lisp_Object value) /* used as unwind-protect function */ |
| 5544 | |
| 5545 | { |
| 5546 | minibuffer_auto_raise = XINT (value); |
| 5547 | return Qnil; |
| 5548 | } |
| 5549 | |
| 5550 | static Lisp_Object |
| 5551 | do_auto_save_make_dir (Lisp_Object dir) |
| 5552 | { |
| 5553 | Lisp_Object result; |
| 5554 | |
| 5555 | auto_saving_dir_umask = 077; |
| 5556 | result = call2 (Qmake_directory, dir, Qt); |
| 5557 | auto_saving_dir_umask = 0; |
| 5558 | return result; |
| 5559 | } |
| 5560 | |
| 5561 | static Lisp_Object |
| 5562 | do_auto_save_eh (Lisp_Object ignore) |
| 5563 | { |
| 5564 | auto_saving_dir_umask = 0; |
| 5565 | return Qnil; |
| 5566 | } |
| 5567 | |
| 5568 | DEFUN ("do-auto-save", Fdo_auto_save, Sdo_auto_save, 0, 2, "", |
| 5569 | doc: /* Auto-save all buffers that need it. |
| 5570 | This is all buffers that have auto-saving enabled |
| 5571 | and are changed since last auto-saved. |
| 5572 | Auto-saving writes the buffer into a file |
| 5573 | so that your editing is not lost if the system crashes. |
| 5574 | This file is not the file you visited; that changes only when you save. |
| 5575 | Normally we run the normal hook `auto-save-hook' before saving. |
| 5576 | |
| 5577 | A non-nil NO-MESSAGE argument means do not print any message if successful. |
| 5578 | A non-nil CURRENT-ONLY argument means save only current buffer. */) |
| 5579 | (Lisp_Object no_message, Lisp_Object current_only) |
| 5580 | { |
| 5581 | struct buffer *old = current_buffer, *b; |
| 5582 | Lisp_Object tail, buf, hook; |
| 5583 | bool auto_saved = 0; |
| 5584 | int do_handled_files; |
| 5585 | Lisp_Object oquit; |
| 5586 | FILE *stream = NULL; |
| 5587 | ptrdiff_t count = SPECPDL_INDEX (); |
| 5588 | bool orig_minibuffer_auto_raise = minibuffer_auto_raise; |
| 5589 | bool old_message_p = 0; |
| 5590 | struct gcpro gcpro1, gcpro2; |
| 5591 | |
| 5592 | if (max_specpdl_size < specpdl_size + 40) |
| 5593 | max_specpdl_size = specpdl_size + 40; |
| 5594 | |
| 5595 | if (minibuf_level) |
| 5596 | no_message = Qt; |
| 5597 | |
| 5598 | if (NILP (no_message)) |
| 5599 | { |
| 5600 | old_message_p = push_message (); |
| 5601 | record_unwind_protect (pop_message_unwind, Qnil); |
| 5602 | } |
| 5603 | |
| 5604 | /* Ordinarily don't quit within this function, |
| 5605 | but don't make it impossible to quit (in case we get hung in I/O). */ |
| 5606 | oquit = Vquit_flag; |
| 5607 | Vquit_flag = Qnil; |
| 5608 | |
| 5609 | /* No GCPRO needed, because (when it matters) all Lisp_Object variables |
| 5610 | point to non-strings reached from Vbuffer_alist. */ |
| 5611 | |
| 5612 | hook = intern ("auto-save-hook"); |
| 5613 | Frun_hooks (1, &hook); |
| 5614 | |
| 5615 | if (STRINGP (Vauto_save_list_file_name)) |
| 5616 | { |
| 5617 | Lisp_Object listfile; |
| 5618 | |
| 5619 | listfile = Fexpand_file_name (Vauto_save_list_file_name, Qnil); |
| 5620 | |
| 5621 | /* Don't try to create the directory when shutting down Emacs, |
| 5622 | because creating the directory might signal an error, and |
| 5623 | that would leave Emacs in a strange state. */ |
| 5624 | if (!NILP (Vrun_hooks)) |
| 5625 | { |
| 5626 | Lisp_Object dir; |
| 5627 | dir = Qnil; |
| 5628 | GCPRO2 (dir, listfile); |
| 5629 | dir = Ffile_name_directory (listfile); |
| 5630 | if (NILP (Ffile_directory_p (dir))) |
| 5631 | internal_condition_case_1 (do_auto_save_make_dir, |
| 5632 | dir, Qt, |
| 5633 | do_auto_save_eh); |
| 5634 | UNGCPRO; |
| 5635 | } |
| 5636 | |
| 5637 | stream = fopen (SSDATA (listfile), "w"); |
| 5638 | } |
| 5639 | |
| 5640 | record_unwind_protect (do_auto_save_unwind, |
| 5641 | make_save_pointer (stream)); |
| 5642 | record_unwind_protect (do_auto_save_unwind_1, |
| 5643 | make_number (minibuffer_auto_raise)); |
| 5644 | minibuffer_auto_raise = 0; |
| 5645 | auto_saving = 1; |
| 5646 | auto_save_error_occurred = 0; |
| 5647 | |
| 5648 | /* On first pass, save all files that don't have handlers. |
| 5649 | On second pass, save all files that do have handlers. |
| 5650 | |
| 5651 | If Emacs is crashing, the handlers may tweak what is causing |
| 5652 | Emacs to crash in the first place, and it would be a shame if |
| 5653 | Emacs failed to autosave perfectly ordinary files because it |
| 5654 | couldn't handle some ange-ftp'd file. */ |
| 5655 | |
| 5656 | for (do_handled_files = 0; do_handled_files < 2; do_handled_files++) |
| 5657 | for (tail = Vbuffer_alist; CONSP (tail); tail = XCDR (tail)) |
| 5658 | { |
| 5659 | buf = XCDR (XCAR (tail)); |
| 5660 | b = XBUFFER (buf); |
| 5661 | |
| 5662 | /* Record all the buffers that have auto save mode |
| 5663 | in the special file that lists them. For each of these buffers, |
| 5664 | Record visited name (if any) and auto save name. */ |
| 5665 | if (STRINGP (BVAR (b, auto_save_file_name)) |
| 5666 | && stream != NULL && do_handled_files == 0) |
| 5667 | { |
| 5668 | block_input (); |
| 5669 | if (!NILP (BVAR (b, filename))) |
| 5670 | { |
| 5671 | fwrite (SDATA (BVAR (b, filename)), 1, |
| 5672 | SBYTES (BVAR (b, filename)), stream); |
| 5673 | } |
| 5674 | putc ('\n', stream); |
| 5675 | fwrite (SDATA (BVAR (b, auto_save_file_name)), 1, |
| 5676 | SBYTES (BVAR (b, auto_save_file_name)), stream); |
| 5677 | putc ('\n', stream); |
| 5678 | unblock_input (); |
| 5679 | } |
| 5680 | |
| 5681 | if (!NILP (current_only) |
| 5682 | && b != current_buffer) |
| 5683 | continue; |
| 5684 | |
| 5685 | /* Don't auto-save indirect buffers. |
| 5686 | The base buffer takes care of it. */ |
| 5687 | if (b->base_buffer) |
| 5688 | continue; |
| 5689 | |
| 5690 | /* Check for auto save enabled |
| 5691 | and file changed since last auto save |
| 5692 | and file changed since last real save. */ |
| 5693 | if (STRINGP (BVAR (b, auto_save_file_name)) |
| 5694 | && BUF_SAVE_MODIFF (b) < BUF_MODIFF (b) |
| 5695 | && BUF_AUTOSAVE_MODIFF (b) < BUF_MODIFF (b) |
| 5696 | /* -1 means we've turned off autosaving for a while--see below. */ |
| 5697 | && XINT (BVAR (b, save_length)) >= 0 |
| 5698 | && (do_handled_files |
| 5699 | || NILP (Ffind_file_name_handler (BVAR (b, auto_save_file_name), |
| 5700 | Qwrite_region)))) |
| 5701 | { |
| 5702 | EMACS_TIME before_time = current_emacs_time (); |
| 5703 | EMACS_TIME after_time; |
| 5704 | |
| 5705 | /* If we had a failure, don't try again for 20 minutes. */ |
| 5706 | if (b->auto_save_failure_time > 0 |
| 5707 | && EMACS_SECS (before_time) - b->auto_save_failure_time < 1200) |
| 5708 | continue; |
| 5709 | |
| 5710 | set_buffer_internal (b); |
| 5711 | if (NILP (Vauto_save_include_big_deletions) |
| 5712 | && (XFASTINT (BVAR (b, save_length)) * 10 |
| 5713 | > (BUF_Z (b) - BUF_BEG (b)) * 13) |
| 5714 | /* A short file is likely to change a large fraction; |
| 5715 | spare the user annoying messages. */ |
| 5716 | && XFASTINT (BVAR (b, save_length)) > 5000 |
| 5717 | /* These messages are frequent and annoying for `*mail*'. */ |
| 5718 | && !EQ (BVAR (b, filename), Qnil) |
| 5719 | && NILP (no_message)) |
| 5720 | { |
| 5721 | /* It has shrunk too much; turn off auto-saving here. */ |
| 5722 | minibuffer_auto_raise = orig_minibuffer_auto_raise; |
| 5723 | message_with_string ("Buffer %s has shrunk a lot; auto save disabled in that buffer until next real save", |
| 5724 | BVAR (b, name), 1); |
| 5725 | minibuffer_auto_raise = 0; |
| 5726 | /* Turn off auto-saving until there's a real save, |
| 5727 | and prevent any more warnings. */ |
| 5728 | XSETINT (BVAR (b, save_length), -1); |
| 5729 | Fsleep_for (make_number (1), Qnil); |
| 5730 | continue; |
| 5731 | } |
| 5732 | if (!auto_saved && NILP (no_message)) |
| 5733 | message1 ("Auto-saving..."); |
| 5734 | internal_condition_case (auto_save_1, Qt, auto_save_error); |
| 5735 | auto_saved = 1; |
| 5736 | BUF_AUTOSAVE_MODIFF (b) = BUF_MODIFF (b); |
| 5737 | XSETFASTINT (BVAR (current_buffer, save_length), Z - BEG); |
| 5738 | set_buffer_internal (old); |
| 5739 | |
| 5740 | after_time = current_emacs_time (); |
| 5741 | |
| 5742 | /* If auto-save took more than 60 seconds, |
| 5743 | assume it was an NFS failure that got a timeout. */ |
| 5744 | if (EMACS_SECS (after_time) - EMACS_SECS (before_time) > 60) |
| 5745 | b->auto_save_failure_time = EMACS_SECS (after_time); |
| 5746 | } |
| 5747 | } |
| 5748 | |
| 5749 | /* Prevent another auto save till enough input events come in. */ |
| 5750 | record_auto_save (); |
| 5751 | |
| 5752 | if (auto_saved && NILP (no_message)) |
| 5753 | { |
| 5754 | if (old_message_p) |
| 5755 | { |
| 5756 | /* If we are going to restore an old message, |
| 5757 | give time to read ours. */ |
| 5758 | sit_for (make_number (1), 0, 0); |
| 5759 | restore_message (); |
| 5760 | } |
| 5761 | else if (!auto_save_error_occurred) |
| 5762 | /* Don't overwrite the error message if an error occurred. |
| 5763 | If we displayed a message and then restored a state |
| 5764 | with no message, leave a "done" message on the screen. */ |
| 5765 | message1 ("Auto-saving...done"); |
| 5766 | } |
| 5767 | |
| 5768 | Vquit_flag = oquit; |
| 5769 | |
| 5770 | /* This restores the message-stack status. */ |
| 5771 | unbind_to (count, Qnil); |
| 5772 | return Qnil; |
| 5773 | } |
| 5774 | |
| 5775 | DEFUN ("set-buffer-auto-saved", Fset_buffer_auto_saved, |
| 5776 | Sset_buffer_auto_saved, 0, 0, 0, |
| 5777 | doc: /* Mark current buffer as auto-saved with its current text. |
| 5778 | No auto-save file will be written until the buffer changes again. */) |
| 5779 | (void) |
| 5780 | { |
| 5781 | /* FIXME: This should not be called in indirect buffers, since |
| 5782 | they're not autosaved. */ |
| 5783 | BUF_AUTOSAVE_MODIFF (current_buffer) = MODIFF; |
| 5784 | XSETFASTINT (BVAR (current_buffer, save_length), Z - BEG); |
| 5785 | current_buffer->auto_save_failure_time = 0; |
| 5786 | return Qnil; |
| 5787 | } |
| 5788 | |
| 5789 | DEFUN ("clear-buffer-auto-save-failure", Fclear_buffer_auto_save_failure, |
| 5790 | Sclear_buffer_auto_save_failure, 0, 0, 0, |
| 5791 | doc: /* Clear any record of a recent auto-save failure in the current buffer. */) |
| 5792 | (void) |
| 5793 | { |
| 5794 | current_buffer->auto_save_failure_time = 0; |
| 5795 | return Qnil; |
| 5796 | } |
| 5797 | |
| 5798 | DEFUN ("recent-auto-save-p", Frecent_auto_save_p, Srecent_auto_save_p, |
| 5799 | 0, 0, 0, |
| 5800 | doc: /* Return t if current buffer has been auto-saved recently. |
| 5801 | More precisely, if it has been auto-saved since last read from or saved |
| 5802 | in the visited file. If the buffer has no visited file, |
| 5803 | then any auto-save counts as "recent". */) |
| 5804 | (void) |
| 5805 | { |
| 5806 | /* FIXME: maybe we should return nil for indirect buffers since |
| 5807 | they're never autosaved. */ |
| 5808 | return (SAVE_MODIFF < BUF_AUTOSAVE_MODIFF (current_buffer) ? Qt : Qnil); |
| 5809 | } |
| 5810 | \f |
| 5811 | /* Reading and completing file names */ |
| 5812 | |
| 5813 | DEFUN ("next-read-file-uses-dialog-p", Fnext_read_file_uses_dialog_p, |
| 5814 | Snext_read_file_uses_dialog_p, 0, 0, 0, |
| 5815 | doc: /* Return t if a call to `read-file-name' will use a dialog. |
| 5816 | The return value is only relevant for a call to `read-file-name' that happens |
| 5817 | before any other event (mouse or keypress) is handled. */) |
| 5818 | (void) |
| 5819 | { |
| 5820 | #if defined (USE_MOTIF) || defined (HAVE_NTGUI) || defined (USE_GTK) \ |
| 5821 | || defined (HAVE_NS) |
| 5822 | if ((NILP (last_nonmenu_event) || CONSP (last_nonmenu_event)) |
| 5823 | && use_dialog_box |
| 5824 | && use_file_dialog |
| 5825 | && have_menus_p ()) |
| 5826 | return Qt; |
| 5827 | #endif |
| 5828 | return Qnil; |
| 5829 | } |
| 5830 | |
| 5831 | Lisp_Object |
| 5832 | Fread_file_name (Lisp_Object prompt, Lisp_Object dir, Lisp_Object default_filename, Lisp_Object mustmatch, Lisp_Object initial, Lisp_Object predicate) |
| 5833 | { |
| 5834 | struct gcpro gcpro1; |
| 5835 | Lisp_Object args[7]; |
| 5836 | |
| 5837 | GCPRO1 (default_filename); |
| 5838 | args[0] = intern ("read-file-name"); |
| 5839 | args[1] = prompt; |
| 5840 | args[2] = dir; |
| 5841 | args[3] = default_filename; |
| 5842 | args[4] = mustmatch; |
| 5843 | args[5] = initial; |
| 5844 | args[6] = predicate; |
| 5845 | RETURN_UNGCPRO (Ffuncall (7, args)); |
| 5846 | } |
| 5847 | |
| 5848 | \f |
| 5849 | void |
| 5850 | init_fileio (void) |
| 5851 | { |
| 5852 | valid_timestamp_file_system = 0; |
| 5853 | } |
| 5854 | |
| 5855 | void |
| 5856 | syms_of_fileio (void) |
| 5857 | { |
| 5858 | DEFSYM (Qoperations, "operations"); |
| 5859 | DEFSYM (Qexpand_file_name, "expand-file-name"); |
| 5860 | DEFSYM (Qsubstitute_in_file_name, "substitute-in-file-name"); |
| 5861 | DEFSYM (Qdirectory_file_name, "directory-file-name"); |
| 5862 | DEFSYM (Qfile_name_directory, "file-name-directory"); |
| 5863 | DEFSYM (Qfile_name_nondirectory, "file-name-nondirectory"); |
| 5864 | DEFSYM (Qunhandled_file_name_directory, "unhandled-file-name-directory"); |
| 5865 | DEFSYM (Qfile_name_as_directory, "file-name-as-directory"); |
| 5866 | DEFSYM (Qcopy_file, "copy-file"); |
| 5867 | DEFSYM (Qmake_directory_internal, "make-directory-internal"); |
| 5868 | DEFSYM (Qmake_directory, "make-directory"); |
| 5869 | DEFSYM (Qdelete_directory_internal, "delete-directory-internal"); |
| 5870 | DEFSYM (Qdelete_file, "delete-file"); |
| 5871 | DEFSYM (Qrename_file, "rename-file"); |
| 5872 | DEFSYM (Qadd_name_to_file, "add-name-to-file"); |
| 5873 | DEFSYM (Qmake_symbolic_link, "make-symbolic-link"); |
| 5874 | DEFSYM (Qfile_exists_p, "file-exists-p"); |
| 5875 | DEFSYM (Qfile_executable_p, "file-executable-p"); |
| 5876 | DEFSYM (Qfile_readable_p, "file-readable-p"); |
| 5877 | DEFSYM (Qfile_writable_p, "file-writable-p"); |
| 5878 | DEFSYM (Qfile_symlink_p, "file-symlink-p"); |
| 5879 | DEFSYM (Qaccess_file, "access-file"); |
| 5880 | DEFSYM (Qfile_directory_p, "file-directory-p"); |
| 5881 | DEFSYM (Qfile_regular_p, "file-regular-p"); |
| 5882 | DEFSYM (Qfile_accessible_directory_p, "file-accessible-directory-p"); |
| 5883 | DEFSYM (Qfile_modes, "file-modes"); |
| 5884 | DEFSYM (Qset_file_modes, "set-file-modes"); |
| 5885 | DEFSYM (Qset_file_times, "set-file-times"); |
| 5886 | DEFSYM (Qfile_selinux_context, "file-selinux-context"); |
| 5887 | DEFSYM (Qset_file_selinux_context, "set-file-selinux-context"); |
| 5888 | DEFSYM (Qfile_acl, "file-acl"); |
| 5889 | DEFSYM (Qset_file_acl, "set-file-acl"); |
| 5890 | DEFSYM (Qfile_newer_than_file_p, "file-newer-than-file-p"); |
| 5891 | DEFSYM (Qinsert_file_contents, "insert-file-contents"); |
| 5892 | DEFSYM (Qchoose_write_coding_system, "choose-write-coding-system"); |
| 5893 | DEFSYM (Qwrite_region, "write-region"); |
| 5894 | DEFSYM (Qverify_visited_file_modtime, "verify-visited-file-modtime"); |
| 5895 | DEFSYM (Qset_visited_file_modtime, "set-visited-file-modtime"); |
| 5896 | DEFSYM (Qauto_save_coding, "auto-save-coding"); |
| 5897 | |
| 5898 | DEFSYM (Qfile_name_history, "file-name-history"); |
| 5899 | Fset (Qfile_name_history, Qnil); |
| 5900 | |
| 5901 | DEFSYM (Qfile_error, "file-error"); |
| 5902 | DEFSYM (Qfile_already_exists, "file-already-exists"); |
| 5903 | DEFSYM (Qfile_date_error, "file-date-error"); |
| 5904 | DEFSYM (Qexcl, "excl"); |
| 5905 | |
| 5906 | DEFVAR_LISP ("file-name-coding-system", Vfile_name_coding_system, |
| 5907 | doc: /* Coding system for encoding file names. |
| 5908 | If it is nil, `default-file-name-coding-system' (which see) is used. */); |
| 5909 | Vfile_name_coding_system = Qnil; |
| 5910 | |
| 5911 | DEFVAR_LISP ("default-file-name-coding-system", |
| 5912 | Vdefault_file_name_coding_system, |
| 5913 | doc: /* Default coding system for encoding file names. |
| 5914 | This variable is used only when `file-name-coding-system' is nil. |
| 5915 | |
| 5916 | This variable is set/changed by the command `set-language-environment'. |
| 5917 | User should not set this variable manually, |
| 5918 | instead use `file-name-coding-system' to get a constant encoding |
| 5919 | of file names regardless of the current language environment. */); |
| 5920 | Vdefault_file_name_coding_system = Qnil; |
| 5921 | |
| 5922 | DEFSYM (Qformat_decode, "format-decode"); |
| 5923 | DEFSYM (Qformat_annotate_function, "format-annotate-function"); |
| 5924 | DEFSYM (Qafter_insert_file_set_coding, "after-insert-file-set-coding"); |
| 5925 | DEFSYM (Qcar_less_than_car, "car-less-than-car"); |
| 5926 | |
| 5927 | Fput (Qfile_error, Qerror_conditions, |
| 5928 | Fpurecopy (list2 (Qfile_error, Qerror))); |
| 5929 | Fput (Qfile_error, Qerror_message, |
| 5930 | build_pure_c_string ("File error")); |
| 5931 | |
| 5932 | Fput (Qfile_already_exists, Qerror_conditions, |
| 5933 | Fpurecopy (list3 (Qfile_already_exists, Qfile_error, Qerror))); |
| 5934 | Fput (Qfile_already_exists, Qerror_message, |
| 5935 | build_pure_c_string ("File already exists")); |
| 5936 | |
| 5937 | Fput (Qfile_date_error, Qerror_conditions, |
| 5938 | Fpurecopy (list3 (Qfile_date_error, Qfile_error, Qerror))); |
| 5939 | Fput (Qfile_date_error, Qerror_message, |
| 5940 | build_pure_c_string ("Cannot set file date")); |
| 5941 | |
| 5942 | DEFVAR_LISP ("file-name-handler-alist", Vfile_name_handler_alist, |
| 5943 | doc: /* Alist of elements (REGEXP . HANDLER) for file names handled specially. |
| 5944 | If a file name matches REGEXP, all I/O on that file is done by calling |
| 5945 | HANDLER. If a file name matches more than one handler, the handler |
| 5946 | whose match starts last in the file name gets precedence. The |
| 5947 | function `find-file-name-handler' checks this list for a handler for |
| 5948 | its argument. |
| 5949 | |
| 5950 | HANDLER should be a function. The first argument given to it is the |
| 5951 | name of the I/O primitive to be handled; the remaining arguments are |
| 5952 | the arguments that were passed to that primitive. For example, if you |
| 5953 | do (file-exists-p FILENAME) and FILENAME is handled by HANDLER, then |
| 5954 | HANDLER is called like this: |
| 5955 | |
| 5956 | (funcall HANDLER 'file-exists-p FILENAME) |
| 5957 | |
| 5958 | Note that HANDLER must be able to handle all I/O primitives; if it has |
| 5959 | nothing special to do for a primitive, it should reinvoke the |
| 5960 | primitive to handle the operation \"the usual way\". |
| 5961 | See Info node `(elisp)Magic File Names' for more details. */); |
| 5962 | Vfile_name_handler_alist = Qnil; |
| 5963 | |
| 5964 | DEFVAR_LISP ("set-auto-coding-function", |
| 5965 | Vset_auto_coding_function, |
| 5966 | doc: /* If non-nil, a function to call to decide a coding system of file. |
| 5967 | Two arguments are passed to this function: the file name |
| 5968 | and the length of a file contents following the point. |
| 5969 | This function should return a coding system to decode the file contents. |
| 5970 | It should check the file name against `auto-coding-alist'. |
| 5971 | If no coding system is decided, it should check a coding system |
| 5972 | specified in the heading lines with the format: |
| 5973 | -*- ... coding: CODING-SYSTEM; ... -*- |
| 5974 | or local variable spec of the tailing lines with `coding:' tag. */); |
| 5975 | Vset_auto_coding_function = Qnil; |
| 5976 | |
| 5977 | DEFVAR_LISP ("after-insert-file-functions", Vafter_insert_file_functions, |
| 5978 | doc: /* A list of functions to be called at the end of `insert-file-contents'. |
| 5979 | Each is passed one argument, the number of characters inserted, |
| 5980 | with point at the start of the inserted text. Each function |
| 5981 | should leave point the same, and return the new character count. |
| 5982 | If `insert-file-contents' is intercepted by a handler from |
| 5983 | `file-name-handler-alist', that handler is responsible for calling the |
| 5984 | functions in `after-insert-file-functions' if appropriate. */); |
| 5985 | Vafter_insert_file_functions = Qnil; |
| 5986 | |
| 5987 | DEFVAR_LISP ("write-region-annotate-functions", Vwrite_region_annotate_functions, |
| 5988 | doc: /* A list of functions to be called at the start of `write-region'. |
| 5989 | Each is passed two arguments, START and END as for `write-region'. |
| 5990 | These are usually two numbers but not always; see the documentation |
| 5991 | for `write-region'. The function should return a list of pairs |
| 5992 | of the form (POSITION . STRING), consisting of strings to be effectively |
| 5993 | inserted at the specified positions of the file being written (1 means to |
| 5994 | insert before the first byte written). The POSITIONs must be sorted into |
| 5995 | increasing order. |
| 5996 | |
| 5997 | If there are several annotation functions, the lists returned by these |
| 5998 | functions are merged destructively. As each annotation function runs, |
| 5999 | the variable `write-region-annotations-so-far' contains a list of all |
| 6000 | annotations returned by previous annotation functions. |
| 6001 | |
| 6002 | An annotation function can return with a different buffer current. |
| 6003 | Doing so removes the annotations returned by previous functions, and |
| 6004 | resets START and END to `point-min' and `point-max' of the new buffer. |
| 6005 | |
| 6006 | After `write-region' completes, Emacs calls the function stored in |
| 6007 | `write-region-post-annotation-function', once for each buffer that was |
| 6008 | current when building the annotations (i.e., at least once), with that |
| 6009 | buffer current. */); |
| 6010 | Vwrite_region_annotate_functions = Qnil; |
| 6011 | DEFSYM (Qwrite_region_annotate_functions, "write-region-annotate-functions"); |
| 6012 | |
| 6013 | DEFVAR_LISP ("write-region-post-annotation-function", |
| 6014 | Vwrite_region_post_annotation_function, |
| 6015 | doc: /* Function to call after `write-region' completes. |
| 6016 | The function is called with no arguments. If one or more of the |
| 6017 | annotation functions in `write-region-annotate-functions' changed the |
| 6018 | current buffer, the function stored in this variable is called for |
| 6019 | each of those additional buffers as well, in addition to the original |
| 6020 | buffer. The relevant buffer is current during each function call. */); |
| 6021 | Vwrite_region_post_annotation_function = Qnil; |
| 6022 | staticpro (&Vwrite_region_annotation_buffers); |
| 6023 | |
| 6024 | DEFVAR_LISP ("write-region-annotations-so-far", |
| 6025 | Vwrite_region_annotations_so_far, |
| 6026 | doc: /* When an annotation function is called, this holds the previous annotations. |
| 6027 | These are the annotations made by other annotation functions |
| 6028 | that were already called. See also `write-region-annotate-functions'. */); |
| 6029 | Vwrite_region_annotations_so_far = Qnil; |
| 6030 | |
| 6031 | DEFVAR_LISP ("inhibit-file-name-handlers", Vinhibit_file_name_handlers, |
| 6032 | doc: /* A list of file name handlers that temporarily should not be used. |
| 6033 | This applies only to the operation `inhibit-file-name-operation'. */); |
| 6034 | Vinhibit_file_name_handlers = Qnil; |
| 6035 | |
| 6036 | DEFVAR_LISP ("inhibit-file-name-operation", Vinhibit_file_name_operation, |
| 6037 | doc: /* The operation for which `inhibit-file-name-handlers' is applicable. */); |
| 6038 | Vinhibit_file_name_operation = Qnil; |
| 6039 | |
| 6040 | DEFVAR_LISP ("auto-save-list-file-name", Vauto_save_list_file_name, |
| 6041 | doc: /* File name in which we write a list of all auto save file names. |
| 6042 | This variable is initialized automatically from `auto-save-list-file-prefix' |
| 6043 | shortly after Emacs reads your init file, if you have not yet given it |
| 6044 | a non-nil value. */); |
| 6045 | Vauto_save_list_file_name = Qnil; |
| 6046 | |
| 6047 | DEFVAR_LISP ("auto-save-visited-file-name", Vauto_save_visited_file_name, |
| 6048 | doc: /* Non-nil says auto-save a buffer in the file it is visiting, when practical. |
| 6049 | Normally auto-save files are written under other names. */); |
| 6050 | Vauto_save_visited_file_name = Qnil; |
| 6051 | |
| 6052 | DEFVAR_LISP ("auto-save-include-big-deletions", Vauto_save_include_big_deletions, |
| 6053 | doc: /* If non-nil, auto-save even if a large part of the text is deleted. |
| 6054 | If nil, deleting a substantial portion of the text disables auto-save |
| 6055 | in the buffer; this is the default behavior, because the auto-save |
| 6056 | file is usually more useful if it contains the deleted text. */); |
| 6057 | Vauto_save_include_big_deletions = Qnil; |
| 6058 | |
| 6059 | #ifdef HAVE_FSYNC |
| 6060 | DEFVAR_BOOL ("write-region-inhibit-fsync", write_region_inhibit_fsync, |
| 6061 | doc: /* Non-nil means don't call fsync in `write-region'. |
| 6062 | This variable affects calls to `write-region' as well as save commands. |
| 6063 | A non-nil value may result in data loss! */); |
| 6064 | write_region_inhibit_fsync = 0; |
| 6065 | #endif |
| 6066 | |
| 6067 | DEFVAR_BOOL ("delete-by-moving-to-trash", delete_by_moving_to_trash, |
| 6068 | doc: /* Specifies whether to use the system's trash can. |
| 6069 | When non-nil, certain file deletion commands use the function |
| 6070 | `move-file-to-trash' instead of deleting files outright. |
| 6071 | This includes interactive calls to `delete-file' and |
| 6072 | `delete-directory' and the Dired deletion commands. */); |
| 6073 | delete_by_moving_to_trash = 0; |
| 6074 | Qdelete_by_moving_to_trash = intern_c_string ("delete-by-moving-to-trash"); |
| 6075 | |
| 6076 | DEFSYM (Qmove_file_to_trash, "move-file-to-trash"); |
| 6077 | DEFSYM (Qcopy_directory, "copy-directory"); |
| 6078 | DEFSYM (Qdelete_directory, "delete-directory"); |
| 6079 | |
| 6080 | defsubr (&Sfind_file_name_handler); |
| 6081 | defsubr (&Sfile_name_directory); |
| 6082 | defsubr (&Sfile_name_nondirectory); |
| 6083 | defsubr (&Sunhandled_file_name_directory); |
| 6084 | defsubr (&Sfile_name_as_directory); |
| 6085 | defsubr (&Sdirectory_file_name); |
| 6086 | defsubr (&Smake_temp_name); |
| 6087 | defsubr (&Sexpand_file_name); |
| 6088 | defsubr (&Ssubstitute_in_file_name); |
| 6089 | defsubr (&Scopy_file); |
| 6090 | defsubr (&Smake_directory_internal); |
| 6091 | defsubr (&Sdelete_directory_internal); |
| 6092 | defsubr (&Sdelete_file); |
| 6093 | defsubr (&Srename_file); |
| 6094 | defsubr (&Sadd_name_to_file); |
| 6095 | defsubr (&Smake_symbolic_link); |
| 6096 | defsubr (&Sfile_name_absolute_p); |
| 6097 | defsubr (&Sfile_exists_p); |
| 6098 | defsubr (&Sfile_executable_p); |
| 6099 | defsubr (&Sfile_readable_p); |
| 6100 | defsubr (&Sfile_writable_p); |
| 6101 | defsubr (&Saccess_file); |
| 6102 | defsubr (&Sfile_symlink_p); |
| 6103 | defsubr (&Sfile_directory_p); |
| 6104 | defsubr (&Sfile_accessible_directory_p); |
| 6105 | defsubr (&Sfile_regular_p); |
| 6106 | defsubr (&Sfile_modes); |
| 6107 | defsubr (&Sset_file_modes); |
| 6108 | defsubr (&Sset_file_times); |
| 6109 | defsubr (&Sfile_selinux_context); |
| 6110 | defsubr (&Sfile_acl); |
| 6111 | defsubr (&Sset_file_acl); |
| 6112 | defsubr (&Sset_file_selinux_context); |
| 6113 | defsubr (&Sset_default_file_modes); |
| 6114 | defsubr (&Sdefault_file_modes); |
| 6115 | defsubr (&Sfile_newer_than_file_p); |
| 6116 | defsubr (&Sinsert_file_contents); |
| 6117 | defsubr (&Schoose_write_coding_system); |
| 6118 | defsubr (&Swrite_region); |
| 6119 | defsubr (&Scar_less_than_car); |
| 6120 | defsubr (&Sverify_visited_file_modtime); |
| 6121 | defsubr (&Sclear_visited_file_modtime); |
| 6122 | defsubr (&Svisited_file_modtime); |
| 6123 | defsubr (&Sset_visited_file_modtime); |
| 6124 | defsubr (&Sdo_auto_save); |
| 6125 | defsubr (&Sset_buffer_auto_saved); |
| 6126 | defsubr (&Sclear_buffer_auto_save_failure); |
| 6127 | defsubr (&Srecent_auto_save_p); |
| 6128 | |
| 6129 | defsubr (&Snext_read_file_uses_dialog_p); |
| 6130 | |
| 6131 | #ifdef HAVE_SYNC |
| 6132 | defsubr (&Sunix_sync); |
| 6133 | #endif |
| 6134 | } |