| 1 | /* File IO for GNU Emacs. |
| 2 | |
| 3 | Copyright (C) 1985-1988, 1993-2012 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 <setjmp.h> |
| 27 | #include <unistd.h> |
| 28 | |
| 29 | #ifdef HAVE_PWD_H |
| 30 | #include <pwd.h> |
| 31 | #endif |
| 32 | |
| 33 | #include <ctype.h> |
| 34 | #include <errno.h> |
| 35 | |
| 36 | #ifdef HAVE_LIBSELINUX |
| 37 | #include <selinux/selinux.h> |
| 38 | #include <selinux/context.h> |
| 39 | #endif |
| 40 | |
| 41 | #include "lisp.h" |
| 42 | #include "intervals.h" |
| 43 | #include "character.h" |
| 44 | #include "buffer.h" |
| 45 | #include "coding.h" |
| 46 | #include "window.h" |
| 47 | #include "blockinput.h" |
| 48 | #include "frame.h" |
| 49 | #include "dispextern.h" |
| 50 | |
| 51 | #ifdef WINDOWSNT |
| 52 | #define NOMINMAX 1 |
| 53 | #include <windows.h> |
| 54 | #include <fcntl.h> |
| 55 | #endif /* not WINDOWSNT */ |
| 56 | |
| 57 | #ifdef MSDOS |
| 58 | #include "msdos.h" |
| 59 | #include <sys/param.h> |
| 60 | #include <fcntl.h> |
| 61 | #endif |
| 62 | |
| 63 | #ifdef DOS_NT |
| 64 | /* On Windows, drive letters must be alphabetic - on DOS, the Netware |
| 65 | redirector allows the six letters between 'Z' and 'a' as well. */ |
| 66 | #ifdef MSDOS |
| 67 | #define IS_DRIVE(x) ((x) >= 'A' && (x) <= 'z') |
| 68 | #endif |
| 69 | #ifdef WINDOWSNT |
| 70 | #define IS_DRIVE(x) isalpha ((unsigned char) (x)) |
| 71 | #endif |
| 72 | /* Need to lower-case the drive letter, or else expanded |
| 73 | filenames will sometimes compare unequal, because |
| 74 | `expand-file-name' doesn't always down-case the drive letter. */ |
| 75 | #define DRIVE_LETTER(x) (tolower ((unsigned char) (x))) |
| 76 | #endif |
| 77 | |
| 78 | #include "systime.h" |
| 79 | #include <stat-time.h> |
| 80 | |
| 81 | #ifdef HPUX |
| 82 | #include <netio.h> |
| 83 | #endif |
| 84 | |
| 85 | #include "commands.h" |
| 86 | |
| 87 | #ifndef FILE_SYSTEM_CASE |
| 88 | #define FILE_SYSTEM_CASE(filename) (filename) |
| 89 | #endif |
| 90 | |
| 91 | /* Nonzero during writing of auto-save files. */ |
| 92 | static int auto_saving; |
| 93 | |
| 94 | /* Nonzero umask during creation of auto-save directories. */ |
| 95 | static int auto_saving_dir_umask; |
| 96 | |
| 97 | /* Set by auto_save_1 to mode of original file so Fwrite_region will create |
| 98 | a new file with the same mode as the original. */ |
| 99 | static int auto_save_mode_bits; |
| 100 | |
| 101 | /* Set by auto_save_1 if an error occurred during the last auto-save. */ |
| 102 | static int auto_save_error_occurred; |
| 103 | |
| 104 | /* The symbol bound to coding-system-for-read when |
| 105 | insert-file-contents is called for recovering a file. This is not |
| 106 | an actual coding system name, but just an indicator to tell |
| 107 | insert-file-contents to use `emacs-mule' with a special flag for |
| 108 | auto saving and recovering a file. */ |
| 109 | static Lisp_Object Qauto_save_coding; |
| 110 | |
| 111 | /* Property name of a file name handler, |
| 112 | which gives a list of operations it handles.. */ |
| 113 | static Lisp_Object Qoperations; |
| 114 | |
| 115 | /* Lisp functions for translating file formats. */ |
| 116 | static Lisp_Object Qformat_decode, Qformat_annotate_function; |
| 117 | |
| 118 | /* Lisp function for setting buffer-file-coding-system and the |
| 119 | multibyteness of the current buffer after inserting a file. */ |
| 120 | static Lisp_Object Qafter_insert_file_set_coding; |
| 121 | |
| 122 | static Lisp_Object Qwrite_region_annotate_functions; |
| 123 | /* Each time an annotation function changes the buffer, the new buffer |
| 124 | is added here. */ |
| 125 | static Lisp_Object Vwrite_region_annotation_buffers; |
| 126 | |
| 127 | #ifdef HAVE_FSYNC |
| 128 | #endif |
| 129 | |
| 130 | static Lisp_Object Qdelete_by_moving_to_trash; |
| 131 | |
| 132 | /* Lisp function for moving files to trash. */ |
| 133 | static Lisp_Object Qmove_file_to_trash; |
| 134 | |
| 135 | /* Lisp function for recursively copying directories. */ |
| 136 | static Lisp_Object Qcopy_directory; |
| 137 | |
| 138 | /* Lisp function for recursively deleting directories. */ |
| 139 | static Lisp_Object Qdelete_directory; |
| 140 | |
| 141 | #ifdef WINDOWSNT |
| 142 | #endif |
| 143 | |
| 144 | Lisp_Object Qfile_error; |
| 145 | static Lisp_Object Qfile_already_exists, Qfile_date_error; |
| 146 | static Lisp_Object Qexcl; |
| 147 | Lisp_Object Qfile_name_history; |
| 148 | |
| 149 | static Lisp_Object Qcar_less_than_car; |
| 150 | |
| 151 | static int a_write (int, Lisp_Object, ptrdiff_t, ptrdiff_t, |
| 152 | Lisp_Object *, struct coding_system *); |
| 153 | static int e_write (int, Lisp_Object, ptrdiff_t, ptrdiff_t, |
| 154 | struct coding_system *); |
| 155 | |
| 156 | \f |
| 157 | void |
| 158 | report_file_error (const char *string, Lisp_Object data) |
| 159 | { |
| 160 | Lisp_Object errstring; |
| 161 | int errorno = errno; |
| 162 | char *str; |
| 163 | |
| 164 | synchronize_system_messages_locale (); |
| 165 | str = strerror (errorno); |
| 166 | errstring = code_convert_string_norecord (make_unibyte_string (str, |
| 167 | strlen (str)), |
| 168 | Vlocale_coding_system, 0); |
| 169 | |
| 170 | while (1) |
| 171 | switch (errorno) |
| 172 | { |
| 173 | case EEXIST: |
| 174 | xsignal (Qfile_already_exists, Fcons (errstring, data)); |
| 175 | break; |
| 176 | default: |
| 177 | /* System error messages are capitalized. Downcase the initial |
| 178 | unless it is followed by a slash. (The slash case caters to |
| 179 | error messages that begin with "I/O" or, in German, "E/A".) */ |
| 180 | if (STRING_MULTIBYTE (errstring) |
| 181 | && ! EQ (Faref (errstring, make_number (1)), make_number ('/'))) |
| 182 | { |
| 183 | int c; |
| 184 | |
| 185 | str = SSDATA (errstring); |
| 186 | c = STRING_CHAR ((unsigned char *) str); |
| 187 | Faset (errstring, make_number (0), make_number (downcase (c))); |
| 188 | } |
| 189 | |
| 190 | xsignal (Qfile_error, |
| 191 | Fcons (build_string (string), Fcons (errstring, data))); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | Lisp_Object |
| 196 | close_file_unwind (Lisp_Object fd) |
| 197 | { |
| 198 | emacs_close (XFASTINT (fd)); |
| 199 | return Qnil; |
| 200 | } |
| 201 | |
| 202 | /* Restore point, having saved it as a marker. */ |
| 203 | |
| 204 | Lisp_Object |
| 205 | restore_point_unwind (Lisp_Object location) |
| 206 | { |
| 207 | Fgoto_char (location); |
| 208 | Fset_marker (location, Qnil, Qnil); |
| 209 | return Qnil; |
| 210 | } |
| 211 | |
| 212 | \f |
| 213 | static Lisp_Object Qexpand_file_name; |
| 214 | static Lisp_Object Qsubstitute_in_file_name; |
| 215 | static Lisp_Object Qdirectory_file_name; |
| 216 | static Lisp_Object Qfile_name_directory; |
| 217 | static Lisp_Object Qfile_name_nondirectory; |
| 218 | static Lisp_Object Qunhandled_file_name_directory; |
| 219 | static Lisp_Object Qfile_name_as_directory; |
| 220 | static Lisp_Object Qcopy_file; |
| 221 | static Lisp_Object Qmake_directory_internal; |
| 222 | static Lisp_Object Qmake_directory; |
| 223 | static Lisp_Object Qdelete_directory_internal; |
| 224 | Lisp_Object Qdelete_file; |
| 225 | static Lisp_Object Qrename_file; |
| 226 | static Lisp_Object Qadd_name_to_file; |
| 227 | static Lisp_Object Qmake_symbolic_link; |
| 228 | Lisp_Object Qfile_exists_p; |
| 229 | static Lisp_Object Qfile_executable_p; |
| 230 | static Lisp_Object Qfile_readable_p; |
| 231 | static Lisp_Object Qfile_writable_p; |
| 232 | static Lisp_Object Qfile_symlink_p; |
| 233 | static Lisp_Object Qaccess_file; |
| 234 | Lisp_Object Qfile_directory_p; |
| 235 | static Lisp_Object Qfile_regular_p; |
| 236 | static Lisp_Object Qfile_accessible_directory_p; |
| 237 | static Lisp_Object Qfile_modes; |
| 238 | static Lisp_Object Qset_file_modes; |
| 239 | static Lisp_Object Qset_file_times; |
| 240 | static Lisp_Object Qfile_selinux_context; |
| 241 | static Lisp_Object Qset_file_selinux_context; |
| 242 | static Lisp_Object Qfile_newer_than_file_p; |
| 243 | Lisp_Object Qinsert_file_contents; |
| 244 | Lisp_Object Qwrite_region; |
| 245 | static Lisp_Object Qverify_visited_file_modtime; |
| 246 | static Lisp_Object Qset_visited_file_modtime; |
| 247 | |
| 248 | DEFUN ("find-file-name-handler", Ffind_file_name_handler, |
| 249 | Sfind_file_name_handler, 2, 2, 0, |
| 250 | doc: /* Return FILENAME's handler function for OPERATION, if it has one. |
| 251 | Otherwise, return nil. |
| 252 | A file name is handled if one of the regular expressions in |
| 253 | `file-name-handler-alist' matches it. |
| 254 | |
| 255 | If OPERATION equals `inhibit-file-name-operation', then we ignore |
| 256 | any handlers that are members of `inhibit-file-name-handlers', |
| 257 | but we still do run any other handlers. This lets handlers |
| 258 | use the standard functions without calling themselves recursively. */) |
| 259 | (Lisp_Object filename, Lisp_Object operation) |
| 260 | { |
| 261 | /* This function must not munge the match data. */ |
| 262 | Lisp_Object chain, inhibited_handlers, result; |
| 263 | ptrdiff_t pos = -1; |
| 264 | |
| 265 | result = Qnil; |
| 266 | CHECK_STRING (filename); |
| 267 | |
| 268 | if (EQ (operation, Vinhibit_file_name_operation)) |
| 269 | inhibited_handlers = Vinhibit_file_name_handlers; |
| 270 | else |
| 271 | inhibited_handlers = Qnil; |
| 272 | |
| 273 | for (chain = Vfile_name_handler_alist; CONSP (chain); |
| 274 | chain = XCDR (chain)) |
| 275 | { |
| 276 | Lisp_Object elt; |
| 277 | elt = XCAR (chain); |
| 278 | if (CONSP (elt)) |
| 279 | { |
| 280 | Lisp_Object string = XCAR (elt); |
| 281 | ptrdiff_t match_pos; |
| 282 | Lisp_Object handler = XCDR (elt); |
| 283 | Lisp_Object operations = Qnil; |
| 284 | |
| 285 | if (SYMBOLP (handler)) |
| 286 | operations = Fget (handler, Qoperations); |
| 287 | |
| 288 | if (STRINGP (string) |
| 289 | && (match_pos = fast_string_match (string, filename)) > pos |
| 290 | && (NILP (operations) || ! NILP (Fmemq (operation, operations)))) |
| 291 | { |
| 292 | Lisp_Object tem; |
| 293 | |
| 294 | handler = XCDR (elt); |
| 295 | tem = Fmemq (handler, inhibited_handlers); |
| 296 | if (NILP (tem)) |
| 297 | { |
| 298 | result = handler; |
| 299 | pos = match_pos; |
| 300 | } |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | QUIT; |
| 305 | } |
| 306 | return result; |
| 307 | } |
| 308 | \f |
| 309 | DEFUN ("file-name-directory", Ffile_name_directory, Sfile_name_directory, |
| 310 | 1, 1, 0, |
| 311 | doc: /* Return the directory component in file name FILENAME. |
| 312 | Return nil if FILENAME does not include a directory. |
| 313 | Otherwise return a directory name. |
| 314 | Given a Unix syntax file name, returns a string ending in slash. */) |
| 315 | (Lisp_Object filename) |
| 316 | { |
| 317 | #ifndef DOS_NT |
| 318 | register const char *beg; |
| 319 | #else |
| 320 | register char *beg; |
| 321 | #endif |
| 322 | register const char *p; |
| 323 | Lisp_Object handler; |
| 324 | |
| 325 | CHECK_STRING (filename); |
| 326 | |
| 327 | /* If the file name has special constructs in it, |
| 328 | call the corresponding file handler. */ |
| 329 | handler = Ffind_file_name_handler (filename, Qfile_name_directory); |
| 330 | if (!NILP (handler)) |
| 331 | { |
| 332 | Lisp_Object handled_name = call2 (handler, Qfile_name_directory, |
| 333 | filename); |
| 334 | return STRINGP (handled_name) ? handled_name : Qnil; |
| 335 | } |
| 336 | |
| 337 | filename = FILE_SYSTEM_CASE (filename); |
| 338 | #ifdef DOS_NT |
| 339 | beg = alloca (SBYTES (filename) + 1); |
| 340 | memcpy (beg, SSDATA (filename), SBYTES (filename) + 1); |
| 341 | #else |
| 342 | beg = SSDATA (filename); |
| 343 | #endif |
| 344 | p = beg + SBYTES (filename); |
| 345 | |
| 346 | while (p != beg && !IS_DIRECTORY_SEP (p[-1]) |
| 347 | #ifdef DOS_NT |
| 348 | /* only recognize drive specifier at the beginning */ |
| 349 | && !(p[-1] == ':' |
| 350 | /* handle the "/:d:foo" and "/:foo" cases correctly */ |
| 351 | && ((p == beg + 2 && !IS_DIRECTORY_SEP (*beg)) |
| 352 | || (p == beg + 4 && IS_DIRECTORY_SEP (*beg)))) |
| 353 | #endif |
| 354 | ) p--; |
| 355 | |
| 356 | if (p == beg) |
| 357 | return Qnil; |
| 358 | #ifdef DOS_NT |
| 359 | /* Expansion of "c:" to drive and default directory. */ |
| 360 | if (p[-1] == ':') |
| 361 | { |
| 362 | /* MAXPATHLEN+1 is guaranteed to be enough space for getdefdir. */ |
| 363 | char *res = alloca (MAXPATHLEN + 1); |
| 364 | char *r = res; |
| 365 | |
| 366 | if (p == beg + 4 && IS_DIRECTORY_SEP (*beg) && beg[1] == ':') |
| 367 | { |
| 368 | memcpy (res, beg, 2); |
| 369 | beg += 2; |
| 370 | r += 2; |
| 371 | } |
| 372 | |
| 373 | if (getdefdir (toupper ((unsigned char) *beg) - 'A' + 1, r)) |
| 374 | { |
| 375 | if (!IS_DIRECTORY_SEP (res[strlen (res) - 1])) |
| 376 | strcat (res, "/"); |
| 377 | beg = res; |
| 378 | p = beg + strlen (beg); |
| 379 | } |
| 380 | } |
| 381 | dostounix_filename (beg); |
| 382 | #endif /* DOS_NT */ |
| 383 | |
| 384 | return make_specified_string (beg, -1, p - beg, STRING_MULTIBYTE (filename)); |
| 385 | } |
| 386 | |
| 387 | DEFUN ("file-name-nondirectory", Ffile_name_nondirectory, |
| 388 | Sfile_name_nondirectory, 1, 1, 0, |
| 389 | doc: /* Return file name FILENAME sans its directory. |
| 390 | For example, in a Unix-syntax file name, |
| 391 | this is everything after the last slash, |
| 392 | or the entire name if it contains no slash. */) |
| 393 | (Lisp_Object filename) |
| 394 | { |
| 395 | register const char *beg, *p, *end; |
| 396 | Lisp_Object handler; |
| 397 | |
| 398 | CHECK_STRING (filename); |
| 399 | |
| 400 | /* If the file name has special constructs in it, |
| 401 | call the corresponding file handler. */ |
| 402 | handler = Ffind_file_name_handler (filename, Qfile_name_nondirectory); |
| 403 | if (!NILP (handler)) |
| 404 | { |
| 405 | Lisp_Object handled_name = call2 (handler, Qfile_name_nondirectory, |
| 406 | filename); |
| 407 | if (STRINGP (handled_name)) |
| 408 | return handled_name; |
| 409 | error ("Invalid handler in `file-name-handler-alist'"); |
| 410 | } |
| 411 | |
| 412 | beg = SSDATA (filename); |
| 413 | end = p = beg + SBYTES (filename); |
| 414 | |
| 415 | while (p != beg && !IS_DIRECTORY_SEP (p[-1]) |
| 416 | #ifdef DOS_NT |
| 417 | /* only recognize drive specifier at beginning */ |
| 418 | && !(p[-1] == ':' |
| 419 | /* handle the "/:d:foo" case correctly */ |
| 420 | && (p == beg + 2 || (p == beg + 4 && IS_DIRECTORY_SEP (*beg)))) |
| 421 | #endif |
| 422 | ) |
| 423 | p--; |
| 424 | |
| 425 | return make_specified_string (p, -1, end - p, STRING_MULTIBYTE (filename)); |
| 426 | } |
| 427 | |
| 428 | DEFUN ("unhandled-file-name-directory", Funhandled_file_name_directory, |
| 429 | Sunhandled_file_name_directory, 1, 1, 0, |
| 430 | doc: /* Return a directly usable directory name somehow associated with FILENAME. |
| 431 | A `directly usable' directory name is one that may be used without the |
| 432 | intervention of any file handler. |
| 433 | If FILENAME is a directly usable file itself, return |
| 434 | \(file-name-directory FILENAME). |
| 435 | If FILENAME refers to a file which is not accessible from a local process, |
| 436 | then this should return nil. |
| 437 | The `call-process' and `start-process' functions use this function to |
| 438 | get a current directory to run processes in. */) |
| 439 | (Lisp_Object filename) |
| 440 | { |
| 441 | Lisp_Object handler; |
| 442 | |
| 443 | /* If the file name has special constructs in it, |
| 444 | call the corresponding file handler. */ |
| 445 | handler = Ffind_file_name_handler (filename, Qunhandled_file_name_directory); |
| 446 | if (!NILP (handler)) |
| 447 | { |
| 448 | Lisp_Object handled_name = call2 (handler, Qunhandled_file_name_directory, |
| 449 | filename); |
| 450 | return STRINGP (handled_name) ? handled_name : Qnil; |
| 451 | } |
| 452 | |
| 453 | return Ffile_name_directory (filename); |
| 454 | } |
| 455 | |
| 456 | /* Convert from file name SRC of length SRCLEN to directory name |
| 457 | in DST. On UNIX, just make sure there is a terminating /. |
| 458 | Return the length of DST. */ |
| 459 | |
| 460 | static ptrdiff_t |
| 461 | file_name_as_directory (char *dst, const char *src, ptrdiff_t srclen) |
| 462 | { |
| 463 | if (srclen == 0) |
| 464 | { |
| 465 | dst[0] = '.'; |
| 466 | dst[1] = '/'; |
| 467 | dst[2] = '\0'; |
| 468 | return 2; |
| 469 | } |
| 470 | |
| 471 | strcpy (dst, src); |
| 472 | |
| 473 | if (!IS_DIRECTORY_SEP (dst[srclen - 1])) |
| 474 | { |
| 475 | dst[srclen] = DIRECTORY_SEP; |
| 476 | dst[srclen + 1] = '\0'; |
| 477 | srclen++; |
| 478 | } |
| 479 | #ifdef DOS_NT |
| 480 | dostounix_filename (dst); |
| 481 | #endif |
| 482 | return srclen; |
| 483 | } |
| 484 | |
| 485 | DEFUN ("file-name-as-directory", Ffile_name_as_directory, |
| 486 | Sfile_name_as_directory, 1, 1, 0, |
| 487 | doc: /* Return a string representing the file name FILE interpreted as a directory. |
| 488 | This operation exists because a directory is also a file, but its name as |
| 489 | a directory is different from its name as a file. |
| 490 | The result can be used as the value of `default-directory' |
| 491 | or passed as second argument to `expand-file-name'. |
| 492 | For a Unix-syntax file name, just appends a slash. */) |
| 493 | (Lisp_Object file) |
| 494 | { |
| 495 | char *buf; |
| 496 | ptrdiff_t length; |
| 497 | Lisp_Object handler; |
| 498 | |
| 499 | CHECK_STRING (file); |
| 500 | if (NILP (file)) |
| 501 | return Qnil; |
| 502 | |
| 503 | /* If the file name has special constructs in it, |
| 504 | call the corresponding file handler. */ |
| 505 | handler = Ffind_file_name_handler (file, Qfile_name_as_directory); |
| 506 | if (!NILP (handler)) |
| 507 | { |
| 508 | Lisp_Object handled_name = call2 (handler, Qfile_name_as_directory, |
| 509 | file); |
| 510 | if (STRINGP (handled_name)) |
| 511 | return handled_name; |
| 512 | error ("Invalid handler in `file-name-handler-alist'"); |
| 513 | } |
| 514 | |
| 515 | buf = alloca (SBYTES (file) + 10); |
| 516 | length = file_name_as_directory (buf, SSDATA (file), SBYTES (file)); |
| 517 | return make_specified_string (buf, -1, length, STRING_MULTIBYTE (file)); |
| 518 | } |
| 519 | \f |
| 520 | /* Convert from directory name SRC of length SRCLEN to |
| 521 | file name in DST. On UNIX, just make sure there isn't |
| 522 | a terminating /. Return the length of DST. */ |
| 523 | |
| 524 | static ptrdiff_t |
| 525 | directory_file_name (char *dst, char *src, ptrdiff_t srclen) |
| 526 | { |
| 527 | /* Process as Unix format: just remove any final slash. |
| 528 | But leave "/" unchanged; do not change it to "". */ |
| 529 | strcpy (dst, src); |
| 530 | if (srclen > 1 |
| 531 | && IS_DIRECTORY_SEP (dst[srclen - 1]) |
| 532 | #ifdef DOS_NT |
| 533 | && !IS_ANY_SEP (dst[srclen - 2]) |
| 534 | #endif |
| 535 | ) |
| 536 | { |
| 537 | dst[srclen - 1] = 0; |
| 538 | srclen--; |
| 539 | } |
| 540 | #ifdef DOS_NT |
| 541 | dostounix_filename (dst); |
| 542 | #endif |
| 543 | return srclen; |
| 544 | } |
| 545 | |
| 546 | DEFUN ("directory-file-name", Fdirectory_file_name, Sdirectory_file_name, |
| 547 | 1, 1, 0, |
| 548 | doc: /* Returns the file name of the directory named DIRECTORY. |
| 549 | This is the name of the file that holds the data for the directory DIRECTORY. |
| 550 | This operation exists because a directory is also a file, but its name as |
| 551 | a directory is different from its name as a file. |
| 552 | In Unix-syntax, this function just removes the final slash. */) |
| 553 | (Lisp_Object directory) |
| 554 | { |
| 555 | char *buf; |
| 556 | ptrdiff_t length; |
| 557 | Lisp_Object handler; |
| 558 | |
| 559 | CHECK_STRING (directory); |
| 560 | |
| 561 | if (NILP (directory)) |
| 562 | return Qnil; |
| 563 | |
| 564 | /* If the file name has special constructs in it, |
| 565 | call the corresponding file handler. */ |
| 566 | handler = Ffind_file_name_handler (directory, Qdirectory_file_name); |
| 567 | if (!NILP (handler)) |
| 568 | { |
| 569 | Lisp_Object handled_name = call2 (handler, Qdirectory_file_name, |
| 570 | directory); |
| 571 | if (STRINGP (handled_name)) |
| 572 | return handled_name; |
| 573 | error ("Invalid handler in `file-name-handler-alist'"); |
| 574 | } |
| 575 | |
| 576 | buf = alloca (SBYTES (directory) + 20); |
| 577 | length = directory_file_name (buf, SSDATA (directory), SBYTES (directory)); |
| 578 | return make_specified_string (buf, -1, length, STRING_MULTIBYTE (directory)); |
| 579 | } |
| 580 | |
| 581 | static const char make_temp_name_tbl[64] = |
| 582 | { |
| 583 | 'A','B','C','D','E','F','G','H', |
| 584 | 'I','J','K','L','M','N','O','P', |
| 585 | 'Q','R','S','T','U','V','W','X', |
| 586 | 'Y','Z','a','b','c','d','e','f', |
| 587 | 'g','h','i','j','k','l','m','n', |
| 588 | 'o','p','q','r','s','t','u','v', |
| 589 | 'w','x','y','z','0','1','2','3', |
| 590 | '4','5','6','7','8','9','-','_' |
| 591 | }; |
| 592 | |
| 593 | static unsigned make_temp_name_count, make_temp_name_count_initialized_p; |
| 594 | |
| 595 | /* Value is a temporary file name starting with PREFIX, a string. |
| 596 | |
| 597 | The Emacs process number forms part of the result, so there is |
| 598 | no danger of generating a name being used by another process. |
| 599 | In addition, this function makes an attempt to choose a name |
| 600 | which has no existing file. To make this work, PREFIX should be |
| 601 | an absolute file name. |
| 602 | |
| 603 | BASE64_P non-zero means add the pid as 3 characters in base64 |
| 604 | encoding. In this case, 6 characters will be added to PREFIX to |
| 605 | form the file name. Otherwise, if Emacs is running on a system |
| 606 | with long file names, add the pid as a decimal number. |
| 607 | |
| 608 | This function signals an error if no unique file name could be |
| 609 | generated. */ |
| 610 | |
| 611 | Lisp_Object |
| 612 | make_temp_name (Lisp_Object prefix, int base64_p) |
| 613 | { |
| 614 | Lisp_Object val; |
| 615 | int len, clen; |
| 616 | printmax_t pid; |
| 617 | char *p, *data; |
| 618 | char pidbuf[INT_BUFSIZE_BOUND (printmax_t)]; |
| 619 | int pidlen; |
| 620 | |
| 621 | CHECK_STRING (prefix); |
| 622 | |
| 623 | /* VAL is created by adding 6 characters to PREFIX. The first |
| 624 | three are the PID of this process, in base 64, and the second |
| 625 | three are incremented if the file already exists. This ensures |
| 626 | 262144 unique file names per PID per PREFIX. */ |
| 627 | |
| 628 | pid = getpid (); |
| 629 | |
| 630 | if (base64_p) |
| 631 | { |
| 632 | pidbuf[0] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 633 | pidbuf[1] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 634 | pidbuf[2] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 635 | pidlen = 3; |
| 636 | } |
| 637 | else |
| 638 | { |
| 639 | #ifdef HAVE_LONG_FILE_NAMES |
| 640 | pidlen = sprintf (pidbuf, "%"pMd, pid); |
| 641 | #else |
| 642 | pidbuf[0] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 643 | pidbuf[1] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 644 | pidbuf[2] = make_temp_name_tbl[pid & 63], pid >>= 6; |
| 645 | pidlen = 3; |
| 646 | #endif |
| 647 | } |
| 648 | |
| 649 | len = SBYTES (prefix); clen = SCHARS (prefix); |
| 650 | val = make_uninit_multibyte_string (clen + 3 + pidlen, len + 3 + pidlen); |
| 651 | if (!STRING_MULTIBYTE (prefix)) |
| 652 | STRING_SET_UNIBYTE (val); |
| 653 | data = SSDATA (val); |
| 654 | memcpy (data, SSDATA (prefix), len); |
| 655 | p = data + len; |
| 656 | |
| 657 | memcpy (p, pidbuf, pidlen); |
| 658 | p += pidlen; |
| 659 | |
| 660 | /* Here we try to minimize useless stat'ing when this function is |
| 661 | invoked many times successively with the same PREFIX. We achieve |
| 662 | this by initializing count to a random value, and incrementing it |
| 663 | afterwards. |
| 664 | |
| 665 | We don't want make-temp-name to be called while dumping, |
| 666 | because then make_temp_name_count_initialized_p would get set |
| 667 | and then make_temp_name_count would not be set when Emacs starts. */ |
| 668 | |
| 669 | if (!make_temp_name_count_initialized_p) |
| 670 | { |
| 671 | make_temp_name_count = time (NULL); |
| 672 | make_temp_name_count_initialized_p = 1; |
| 673 | } |
| 674 | |
| 675 | while (1) |
| 676 | { |
| 677 | struct stat ignored; |
| 678 | unsigned num = make_temp_name_count; |
| 679 | |
| 680 | p[0] = make_temp_name_tbl[num & 63], num >>= 6; |
| 681 | p[1] = make_temp_name_tbl[num & 63], num >>= 6; |
| 682 | p[2] = make_temp_name_tbl[num & 63], num >>= 6; |
| 683 | |
| 684 | /* Poor man's congruential RN generator. Replace with |
| 685 | ++make_temp_name_count for debugging. */ |
| 686 | make_temp_name_count += 25229; |
| 687 | make_temp_name_count %= 225307; |
| 688 | |
| 689 | if (stat (data, &ignored) < 0) |
| 690 | { |
| 691 | /* We want to return only if errno is ENOENT. */ |
| 692 | if (errno == ENOENT) |
| 693 | return val; |
| 694 | else |
| 695 | /* The error here is dubious, but there is little else we |
| 696 | can do. The alternatives are to return nil, which is |
| 697 | as bad as (and in many cases worse than) throwing the |
| 698 | error, or to ignore the error, which will likely result |
| 699 | in looping through 225307 stat's, which is not only |
| 700 | dog-slow, but also useless since eventually nil would |
| 701 | have to be returned anyway. */ |
| 702 | report_file_error ("Cannot create temporary name for prefix", |
| 703 | Fcons (prefix, Qnil)); |
| 704 | /* not reached */ |
| 705 | } |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | |
| 710 | DEFUN ("make-temp-name", Fmake_temp_name, Smake_temp_name, 1, 1, 0, |
| 711 | doc: /* Generate temporary file name (string) starting with PREFIX (a string). |
| 712 | The Emacs process number forms part of the result, |
| 713 | so there is no danger of generating a name being used by another process. |
| 714 | |
| 715 | In addition, this function makes an attempt to choose a name |
| 716 | which has no existing file. To make this work, |
| 717 | PREFIX should be an absolute file name. |
| 718 | |
| 719 | There is a race condition between calling `make-temp-name' and creating the |
| 720 | file which opens all kinds of security holes. For that reason, you should |
| 721 | probably use `make-temp-file' instead, except in three circumstances: |
| 722 | |
| 723 | * If you are creating the file in the user's home directory. |
| 724 | * If you are creating a directory rather than an ordinary file. |
| 725 | * If you are taking special precautions as `make-temp-file' does. */) |
| 726 | (Lisp_Object prefix) |
| 727 | { |
| 728 | return make_temp_name (prefix, 0); |
| 729 | } |
| 730 | |
| 731 | |
| 732 | \f |
| 733 | DEFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0, |
| 734 | doc: /* Convert filename NAME to absolute, and canonicalize it. |
| 735 | Second arg DEFAULT-DIRECTORY is directory to start with if NAME is relative |
| 736 | \(does not start with slash or tilde); if DEFAULT-DIRECTORY is nil or missing, |
| 737 | the current buffer's value of `default-directory' is used. |
| 738 | NAME should be a string that is a valid file name for the underlying |
| 739 | filesystem. |
| 740 | File name components that are `.' are removed, and |
| 741 | so are file name components followed by `..', along with the `..' itself; |
| 742 | note that these simplifications are done without checking the resulting |
| 743 | file names in the file system. |
| 744 | Multiple consecutive slashes are collapsed into a single slash, |
| 745 | except at the beginning of the file name when they are significant (e.g., |
| 746 | UNC file names on MS-Windows.) |
| 747 | An initial `~/' expands to your home directory. |
| 748 | An initial `~USER/' expands to USER's home directory. |
| 749 | See also the function `substitute-in-file-name'. |
| 750 | |
| 751 | For technical reasons, this function can return correct but |
| 752 | non-intuitive results for the root directory; for instance, |
| 753 | \(expand-file-name ".." "/") returns "/..". For this reason, use |
| 754 | \(directory-file-name (file-name-directory dirname)) to traverse a |
| 755 | filesystem tree, not (expand-file-name ".." dirname). */) |
| 756 | (Lisp_Object name, Lisp_Object default_directory) |
| 757 | { |
| 758 | /* These point to SDATA and need to be careful with string-relocation |
| 759 | during GC (via DECODE_FILE). */ |
| 760 | char *nm; |
| 761 | const char *newdir; |
| 762 | /* This should only point to alloca'd data. */ |
| 763 | char *target; |
| 764 | |
| 765 | ptrdiff_t tlen; |
| 766 | struct passwd *pw; |
| 767 | #ifdef DOS_NT |
| 768 | int drive = 0; |
| 769 | int collapse_newdir = 1; |
| 770 | int is_escaped = 0; |
| 771 | #endif /* DOS_NT */ |
| 772 | ptrdiff_t length; |
| 773 | Lisp_Object handler, result, handled_name; |
| 774 | int multibyte; |
| 775 | Lisp_Object hdir; |
| 776 | |
| 777 | CHECK_STRING (name); |
| 778 | |
| 779 | /* If the file name has special constructs in it, |
| 780 | call the corresponding file handler. */ |
| 781 | handler = Ffind_file_name_handler (name, Qexpand_file_name); |
| 782 | if (!NILP (handler)) |
| 783 | { |
| 784 | handled_name = call3 (handler, Qexpand_file_name, |
| 785 | name, default_directory); |
| 786 | if (STRINGP (handled_name)) |
| 787 | return handled_name; |
| 788 | error ("Invalid handler in `file-name-handler-alist'"); |
| 789 | } |
| 790 | |
| 791 | |
| 792 | /* Use the buffer's default-directory if DEFAULT_DIRECTORY is omitted. */ |
| 793 | if (NILP (default_directory)) |
| 794 | default_directory = BVAR (current_buffer, directory); |
| 795 | if (! STRINGP (default_directory)) |
| 796 | { |
| 797 | #ifdef DOS_NT |
| 798 | /* "/" is not considered a root directory on DOS_NT, so using "/" |
| 799 | here causes an infinite recursion in, e.g., the following: |
| 800 | |
| 801 | (let (default-directory) |
| 802 | (expand-file-name "a")) |
| 803 | |
| 804 | To avoid this, we set default_directory to the root of the |
| 805 | current drive. */ |
| 806 | default_directory = build_string (emacs_root_dir ()); |
| 807 | #else |
| 808 | default_directory = build_string ("/"); |
| 809 | #endif |
| 810 | } |
| 811 | |
| 812 | if (!NILP (default_directory)) |
| 813 | { |
| 814 | handler = Ffind_file_name_handler (default_directory, Qexpand_file_name); |
| 815 | if (!NILP (handler)) |
| 816 | { |
| 817 | handled_name = call3 (handler, Qexpand_file_name, |
| 818 | name, default_directory); |
| 819 | if (STRINGP (handled_name)) |
| 820 | return handled_name; |
| 821 | error ("Invalid handler in `file-name-handler-alist'"); |
| 822 | } |
| 823 | } |
| 824 | |
| 825 | { |
| 826 | char *o = SSDATA (default_directory); |
| 827 | |
| 828 | /* Make sure DEFAULT_DIRECTORY is properly expanded. |
| 829 | It would be better to do this down below where we actually use |
| 830 | default_directory. Unfortunately, calling Fexpand_file_name recursively |
| 831 | could invoke GC, and the strings might be relocated. This would |
| 832 | be annoying because we have pointers into strings lying around |
| 833 | that would need adjusting, and people would add new pointers to |
| 834 | the code and forget to adjust them, resulting in intermittent bugs. |
| 835 | Putting this call here avoids all that crud. |
| 836 | |
| 837 | The EQ test avoids infinite recursion. */ |
| 838 | if (! NILP (default_directory) && !EQ (default_directory, name) |
| 839 | /* Save time in some common cases - as long as default_directory |
| 840 | is not relative, it can be canonicalized with name below (if it |
| 841 | is needed at all) without requiring it to be expanded now. */ |
| 842 | #ifdef DOS_NT |
| 843 | /* Detect MSDOS file names with drive specifiers. */ |
| 844 | && ! (IS_DRIVE (o[0]) && IS_DEVICE_SEP (o[1]) |
| 845 | && IS_DIRECTORY_SEP (o[2])) |
| 846 | #ifdef WINDOWSNT |
| 847 | /* Detect Windows file names in UNC format. */ |
| 848 | && ! (IS_DIRECTORY_SEP (o[0]) && IS_DIRECTORY_SEP (o[1])) |
| 849 | #endif |
| 850 | #else /* not DOS_NT */ |
| 851 | /* Detect Unix absolute file names (/... alone is not absolute on |
| 852 | DOS or Windows). */ |
| 853 | && ! (IS_DIRECTORY_SEP (o[0])) |
| 854 | #endif /* not DOS_NT */ |
| 855 | ) |
| 856 | { |
| 857 | struct gcpro gcpro1; |
| 858 | |
| 859 | GCPRO1 (name); |
| 860 | default_directory = Fexpand_file_name (default_directory, Qnil); |
| 861 | UNGCPRO; |
| 862 | } |
| 863 | } |
| 864 | name = FILE_SYSTEM_CASE (name); |
| 865 | multibyte = STRING_MULTIBYTE (name); |
| 866 | if (multibyte != STRING_MULTIBYTE (default_directory)) |
| 867 | { |
| 868 | if (multibyte) |
| 869 | default_directory = string_to_multibyte (default_directory); |
| 870 | else |
| 871 | { |
| 872 | name = string_to_multibyte (name); |
| 873 | multibyte = 1; |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | /* Make a local copy of nm[] to protect it from GC in DECODE_FILE below. */ |
| 878 | nm = alloca (SBYTES (name) + 1); |
| 879 | memcpy (nm, SSDATA (name), SBYTES (name) + 1); |
| 880 | |
| 881 | #ifdef DOS_NT |
| 882 | /* Note if special escape prefix is present, but remove for now. */ |
| 883 | if (nm[0] == '/' && nm[1] == ':') |
| 884 | { |
| 885 | is_escaped = 1; |
| 886 | nm += 2; |
| 887 | } |
| 888 | |
| 889 | /* Find and remove drive specifier if present; this makes nm absolute |
| 890 | even if the rest of the name appears to be relative. Only look for |
| 891 | drive specifier at the beginning. */ |
| 892 | if (IS_DRIVE (nm[0]) && IS_DEVICE_SEP (nm[1])) |
| 893 | { |
| 894 | drive = (unsigned char) nm[0]; |
| 895 | nm += 2; |
| 896 | } |
| 897 | |
| 898 | #ifdef WINDOWSNT |
| 899 | /* If we see "c://somedir", we want to strip the first slash after the |
| 900 | colon when stripping the drive letter. Otherwise, this expands to |
| 901 | "//somedir". */ |
| 902 | if (drive && IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1])) |
| 903 | nm++; |
| 904 | |
| 905 | /* Discard any previous drive specifier if nm is now in UNC format. */ |
| 906 | if (IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1])) |
| 907 | { |
| 908 | drive = 0; |
| 909 | } |
| 910 | #endif /* WINDOWSNT */ |
| 911 | #endif /* DOS_NT */ |
| 912 | |
| 913 | /* If nm is absolute, look for `/./' or `/../' or `//''sequences; if |
| 914 | none are found, we can probably return right away. We will avoid |
| 915 | allocating a new string if name is already fully expanded. */ |
| 916 | if ( |
| 917 | IS_DIRECTORY_SEP (nm[0]) |
| 918 | #ifdef MSDOS |
| 919 | && drive && !is_escaped |
| 920 | #endif |
| 921 | #ifdef WINDOWSNT |
| 922 | && (drive || IS_DIRECTORY_SEP (nm[1])) && !is_escaped |
| 923 | #endif |
| 924 | ) |
| 925 | { |
| 926 | /* If it turns out that the filename we want to return is just a |
| 927 | suffix of FILENAME, we don't need to go through and edit |
| 928 | things; we just need to construct a new string using data |
| 929 | starting at the middle of FILENAME. If we set lose to a |
| 930 | non-zero value, that means we've discovered that we can't do |
| 931 | that cool trick. */ |
| 932 | int lose = 0; |
| 933 | char *p = nm; |
| 934 | |
| 935 | while (*p) |
| 936 | { |
| 937 | /* Since we know the name is absolute, we can assume that each |
| 938 | element starts with a "/". */ |
| 939 | |
| 940 | /* "." and ".." are hairy. */ |
| 941 | if (IS_DIRECTORY_SEP (p[0]) |
| 942 | && p[1] == '.' |
| 943 | && (IS_DIRECTORY_SEP (p[2]) |
| 944 | || p[2] == 0 |
| 945 | || (p[2] == '.' && (IS_DIRECTORY_SEP (p[3]) |
| 946 | || p[3] == 0)))) |
| 947 | lose = 1; |
| 948 | /* We want to replace multiple `/' in a row with a single |
| 949 | slash. */ |
| 950 | else if (p > nm |
| 951 | && IS_DIRECTORY_SEP (p[0]) |
| 952 | && IS_DIRECTORY_SEP (p[1])) |
| 953 | lose = 1; |
| 954 | p++; |
| 955 | } |
| 956 | if (!lose) |
| 957 | { |
| 958 | #ifdef DOS_NT |
| 959 | /* Make sure directories are all separated with /, but |
| 960 | avoid allocation of a new string when not required. */ |
| 961 | dostounix_filename (nm); |
| 962 | #ifdef WINDOWSNT |
| 963 | if (IS_DIRECTORY_SEP (nm[1])) |
| 964 | { |
| 965 | if (strcmp (nm, SSDATA (name)) != 0) |
| 966 | name = make_specified_string (nm, -1, strlen (nm), multibyte); |
| 967 | } |
| 968 | else |
| 969 | #endif |
| 970 | /* Drive must be set, so this is okay. */ |
| 971 | if (strcmp (nm - 2, SSDATA (name)) != 0) |
| 972 | { |
| 973 | char temp[] = " :"; |
| 974 | |
| 975 | name = make_specified_string (nm, -1, p - nm, multibyte); |
| 976 | temp[0] = DRIVE_LETTER (drive); |
| 977 | name = concat2 (build_string (temp), name); |
| 978 | } |
| 979 | return name; |
| 980 | #else /* not DOS_NT */ |
| 981 | if (strcmp (nm, SSDATA (name)) == 0) |
| 982 | return name; |
| 983 | return make_specified_string (nm, -1, strlen (nm), multibyte); |
| 984 | #endif /* not DOS_NT */ |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | /* At this point, nm might or might not be an absolute file name. We |
| 989 | need to expand ~ or ~user if present, otherwise prefix nm with |
| 990 | default_directory if nm is not absolute, and finally collapse /./ |
| 991 | and /foo/../ sequences. |
| 992 | |
| 993 | We set newdir to be the appropriate prefix if one is needed: |
| 994 | - the relevant user directory if nm starts with ~ or ~user |
| 995 | - the specified drive's working dir (DOS/NT only) if nm does not |
| 996 | start with / |
| 997 | - the value of default_directory. |
| 998 | |
| 999 | Note that these prefixes are not guaranteed to be absolute (except |
| 1000 | for the working dir of a drive). Therefore, to ensure we always |
| 1001 | return an absolute name, if the final prefix is not absolute we |
| 1002 | append it to the current working directory. */ |
| 1003 | |
| 1004 | newdir = 0; |
| 1005 | |
| 1006 | if (nm[0] == '~') /* prefix ~ */ |
| 1007 | { |
| 1008 | if (IS_DIRECTORY_SEP (nm[1]) |
| 1009 | || nm[1] == 0) /* ~ by itself */ |
| 1010 | { |
| 1011 | Lisp_Object tem; |
| 1012 | |
| 1013 | if (!(newdir = egetenv ("HOME"))) |
| 1014 | newdir = ""; |
| 1015 | nm++; |
| 1016 | /* `egetenv' may return a unibyte string, which will bite us since |
| 1017 | we expect the directory to be multibyte. */ |
| 1018 | tem = build_string (newdir); |
| 1019 | if (!STRING_MULTIBYTE (tem)) |
| 1020 | { |
| 1021 | hdir = DECODE_FILE (tem); |
| 1022 | newdir = SSDATA (hdir); |
| 1023 | } |
| 1024 | #ifdef DOS_NT |
| 1025 | collapse_newdir = 0; |
| 1026 | #endif |
| 1027 | } |
| 1028 | else /* ~user/filename */ |
| 1029 | { |
| 1030 | char *o, *p; |
| 1031 | for (p = nm; *p && (!IS_DIRECTORY_SEP (*p)); p++); |
| 1032 | o = alloca (p - nm + 1); |
| 1033 | memcpy (o, nm, p - nm); |
| 1034 | o [p - nm] = 0; |
| 1035 | |
| 1036 | BLOCK_INPUT; |
| 1037 | pw = (struct passwd *) getpwnam (o + 1); |
| 1038 | UNBLOCK_INPUT; |
| 1039 | if (pw) |
| 1040 | { |
| 1041 | newdir = pw->pw_dir; |
| 1042 | nm = p; |
| 1043 | #ifdef DOS_NT |
| 1044 | collapse_newdir = 0; |
| 1045 | #endif |
| 1046 | } |
| 1047 | |
| 1048 | /* If we don't find a user of that name, leave the name |
| 1049 | unchanged; don't move nm forward to p. */ |
| 1050 | } |
| 1051 | } |
| 1052 | |
| 1053 | #ifdef DOS_NT |
| 1054 | /* On DOS and Windows, nm is absolute if a drive name was specified; |
| 1055 | use the drive's current directory as the prefix if needed. */ |
| 1056 | if (!newdir && drive) |
| 1057 | { |
| 1058 | /* Get default directory if needed to make nm absolute. */ |
| 1059 | char *adir = NULL; |
| 1060 | if (!IS_DIRECTORY_SEP (nm[0])) |
| 1061 | { |
| 1062 | adir = alloca (MAXPATHLEN + 1); |
| 1063 | if (!getdefdir (toupper (drive) - 'A' + 1, adir)) |
| 1064 | adir = NULL; |
| 1065 | } |
| 1066 | if (!adir) |
| 1067 | { |
| 1068 | /* Either nm starts with /, or drive isn't mounted. */ |
| 1069 | adir = alloca (4); |
| 1070 | adir[0] = DRIVE_LETTER (drive); |
| 1071 | adir[1] = ':'; |
| 1072 | adir[2] = '/'; |
| 1073 | adir[3] = 0; |
| 1074 | } |
| 1075 | newdir = adir; |
| 1076 | } |
| 1077 | #endif /* DOS_NT */ |
| 1078 | |
| 1079 | /* Finally, if no prefix has been specified and nm is not absolute, |
| 1080 | then it must be expanded relative to default_directory. */ |
| 1081 | |
| 1082 | if (1 |
| 1083 | #ifndef DOS_NT |
| 1084 | /* /... alone is not absolute on DOS and Windows. */ |
| 1085 | && !IS_DIRECTORY_SEP (nm[0]) |
| 1086 | #endif |
| 1087 | #ifdef WINDOWSNT |
| 1088 | && !(IS_DIRECTORY_SEP (nm[0]) && IS_DIRECTORY_SEP (nm[1])) |
| 1089 | #endif |
| 1090 | && !newdir) |
| 1091 | { |
| 1092 | newdir = SSDATA (default_directory); |
| 1093 | #ifdef DOS_NT |
| 1094 | /* Note if special escape prefix is present, but remove for now. */ |
| 1095 | if (newdir[0] == '/' && newdir[1] == ':') |
| 1096 | { |
| 1097 | is_escaped = 1; |
| 1098 | newdir += 2; |
| 1099 | } |
| 1100 | #endif |
| 1101 | } |
| 1102 | |
| 1103 | #ifdef DOS_NT |
| 1104 | if (newdir) |
| 1105 | { |
| 1106 | /* First ensure newdir is an absolute name. */ |
| 1107 | if ( |
| 1108 | /* Detect MSDOS file names with drive specifiers. */ |
| 1109 | ! (IS_DRIVE (newdir[0]) |
| 1110 | && IS_DEVICE_SEP (newdir[1]) && IS_DIRECTORY_SEP (newdir[2])) |
| 1111 | #ifdef WINDOWSNT |
| 1112 | /* Detect Windows file names in UNC format. */ |
| 1113 | && ! (IS_DIRECTORY_SEP (newdir[0]) && IS_DIRECTORY_SEP (newdir[1])) |
| 1114 | #endif |
| 1115 | ) |
| 1116 | { |
| 1117 | /* Effectively, let newdir be (expand-file-name newdir cwd). |
| 1118 | Because of the admonition against calling expand-file-name |
| 1119 | when we have pointers into lisp strings, we accomplish this |
| 1120 | indirectly by prepending newdir to nm if necessary, and using |
| 1121 | cwd (or the wd of newdir's drive) as the new newdir. */ |
| 1122 | char *adir; |
| 1123 | if (IS_DRIVE (newdir[0]) && IS_DEVICE_SEP (newdir[1])) |
| 1124 | { |
| 1125 | drive = (unsigned char) newdir[0]; |
| 1126 | newdir += 2; |
| 1127 | } |
| 1128 | if (!IS_DIRECTORY_SEP (nm[0])) |
| 1129 | { |
| 1130 | ptrdiff_t newlen = strlen (newdir); |
| 1131 | char *tmp = alloca (newlen + strlen (nm) + 2); |
| 1132 | file_name_as_directory (tmp, newdir, newlen); |
| 1133 | strcat (tmp, nm); |
| 1134 | nm = tmp; |
| 1135 | } |
| 1136 | adir = alloca (MAXPATHLEN + 1); |
| 1137 | if (drive) |
| 1138 | { |
| 1139 | if (!getdefdir (toupper (drive) - 'A' + 1, adir)) |
| 1140 | newdir = "/"; |
| 1141 | } |
| 1142 | else |
| 1143 | getwd (adir); |
| 1144 | newdir = adir; |
| 1145 | } |
| 1146 | |
| 1147 | /* Strip off drive name from prefix, if present. */ |
| 1148 | if (IS_DRIVE (newdir[0]) && IS_DEVICE_SEP (newdir[1])) |
| 1149 | { |
| 1150 | drive = newdir[0]; |
| 1151 | newdir += 2; |
| 1152 | } |
| 1153 | |
| 1154 | /* Keep only a prefix from newdir if nm starts with slash |
| 1155 | (//server/share for UNC, nothing otherwise). */ |
| 1156 | if (IS_DIRECTORY_SEP (nm[0]) && collapse_newdir) |
| 1157 | { |
| 1158 | #ifdef WINDOWSNT |
| 1159 | if (IS_DIRECTORY_SEP (newdir[0]) && IS_DIRECTORY_SEP (newdir[1])) |
| 1160 | { |
| 1161 | char *adir = strcpy (alloca (strlen (newdir) + 1), newdir); |
| 1162 | char *p = adir + 2; |
| 1163 | while (*p && !IS_DIRECTORY_SEP (*p)) p++; |
| 1164 | p++; |
| 1165 | while (*p && !IS_DIRECTORY_SEP (*p)) p++; |
| 1166 | *p = 0; |
| 1167 | newdir = adir; |
| 1168 | } |
| 1169 | else |
| 1170 | #endif |
| 1171 | newdir = ""; |
| 1172 | } |
| 1173 | } |
| 1174 | #endif /* DOS_NT */ |
| 1175 | |
| 1176 | if (newdir) |
| 1177 | { |
| 1178 | /* Get rid of any slash at the end of newdir, unless newdir is |
| 1179 | just / or // (an incomplete UNC name). */ |
| 1180 | length = strlen (newdir); |
| 1181 | tlen = length + 1; |
| 1182 | if (length > 1 && IS_DIRECTORY_SEP (newdir[length - 1]) |
| 1183 | #ifdef WINDOWSNT |
| 1184 | && !(length == 2 && IS_DIRECTORY_SEP (newdir[0])) |
| 1185 | #endif |
| 1186 | ) |
| 1187 | { |
| 1188 | char *temp = alloca (length); |
| 1189 | memcpy (temp, newdir, length - 1); |
| 1190 | temp[length - 1] = 0; |
| 1191 | length--; |
| 1192 | newdir = temp; |
| 1193 | } |
| 1194 | } |
| 1195 | else |
| 1196 | { |
| 1197 | length = 0; |
| 1198 | tlen = 0; |
| 1199 | } |
| 1200 | |
| 1201 | /* Now concatenate the directory and name to new space in the stack frame. */ |
| 1202 | tlen += strlen (nm) + 1; |
| 1203 | #ifdef DOS_NT |
| 1204 | /* Reserve space for drive specifier and escape prefix, since either |
| 1205 | or both may need to be inserted. (The Microsoft x86 compiler |
| 1206 | produces incorrect code if the following two lines are combined.) */ |
| 1207 | target = alloca (tlen + 4); |
| 1208 | target += 4; |
| 1209 | #else /* not DOS_NT */ |
| 1210 | target = alloca (tlen); |
| 1211 | #endif /* not DOS_NT */ |
| 1212 | *target = 0; |
| 1213 | |
| 1214 | if (newdir) |
| 1215 | { |
| 1216 | if (nm[0] == 0 || IS_DIRECTORY_SEP (nm[0])) |
| 1217 | { |
| 1218 | #ifdef DOS_NT |
| 1219 | /* If newdir is effectively "C:/", then the drive letter will have |
| 1220 | been stripped and newdir will be "/". Concatenating with an |
| 1221 | absolute directory in nm produces "//", which will then be |
| 1222 | incorrectly treated as a network share. Ignore newdir in |
| 1223 | this case (keeping the drive letter). */ |
| 1224 | if (!(drive && nm[0] && IS_DIRECTORY_SEP (newdir[0]) |
| 1225 | && newdir[1] == '\0')) |
| 1226 | #endif |
| 1227 | strcpy (target, newdir); |
| 1228 | } |
| 1229 | else |
| 1230 | file_name_as_directory (target, newdir, length); |
| 1231 | } |
| 1232 | |
| 1233 | strcat (target, nm); |
| 1234 | |
| 1235 | /* Now canonicalize by removing `//', `/.' and `/foo/..' if they |
| 1236 | appear. */ |
| 1237 | { |
| 1238 | char *p = target; |
| 1239 | char *o = target; |
| 1240 | |
| 1241 | while (*p) |
| 1242 | { |
| 1243 | if (!IS_DIRECTORY_SEP (*p)) |
| 1244 | { |
| 1245 | *o++ = *p++; |
| 1246 | } |
| 1247 | else if (p[1] == '.' |
| 1248 | && (IS_DIRECTORY_SEP (p[2]) |
| 1249 | || p[2] == 0)) |
| 1250 | { |
| 1251 | /* If "/." is the entire filename, keep the "/". Otherwise, |
| 1252 | just delete the whole "/.". */ |
| 1253 | if (o == target && p[2] == '\0') |
| 1254 | *o++ = *p; |
| 1255 | p += 2; |
| 1256 | } |
| 1257 | else if (p[1] == '.' && p[2] == '.' |
| 1258 | /* `/../' is the "superroot" on certain file systems. |
| 1259 | Turned off on DOS_NT systems because they have no |
| 1260 | "superroot" and because this causes us to produce |
| 1261 | file names like "d:/../foo" which fail file-related |
| 1262 | functions of the underlying OS. (To reproduce, try a |
| 1263 | long series of "../../" in default_directory, longer |
| 1264 | than the number of levels from the root.) */ |
| 1265 | #ifndef DOS_NT |
| 1266 | && o != target |
| 1267 | #endif |
| 1268 | && (IS_DIRECTORY_SEP (p[3]) || p[3] == 0)) |
| 1269 | { |
| 1270 | #ifdef WINDOWSNT |
| 1271 | char *prev_o = o; |
| 1272 | #endif |
| 1273 | while (o != target && (--o) && !IS_DIRECTORY_SEP (*o)) |
| 1274 | ; |
| 1275 | #ifdef WINDOWSNT |
| 1276 | /* Don't go below server level in UNC filenames. */ |
| 1277 | if (o == target + 1 && IS_DIRECTORY_SEP (*o) |
| 1278 | && IS_DIRECTORY_SEP (*target)) |
| 1279 | o = prev_o; |
| 1280 | else |
| 1281 | #endif |
| 1282 | /* Keep initial / only if this is the whole name. */ |
| 1283 | if (o == target && IS_ANY_SEP (*o) && p[3] == 0) |
| 1284 | ++o; |
| 1285 | p += 3; |
| 1286 | } |
| 1287 | else if (p > target && IS_DIRECTORY_SEP (p[1])) |
| 1288 | /* Collapse multiple `/' in a row. */ |
| 1289 | p++; |
| 1290 | else |
| 1291 | { |
| 1292 | *o++ = *p++; |
| 1293 | } |
| 1294 | } |
| 1295 | |
| 1296 | #ifdef DOS_NT |
| 1297 | /* At last, set drive name. */ |
| 1298 | #ifdef WINDOWSNT |
| 1299 | /* Except for network file name. */ |
| 1300 | if (!(IS_DIRECTORY_SEP (target[0]) && IS_DIRECTORY_SEP (target[1]))) |
| 1301 | #endif /* WINDOWSNT */ |
| 1302 | { |
| 1303 | if (!drive) abort (); |
| 1304 | target -= 2; |
| 1305 | target[0] = DRIVE_LETTER (drive); |
| 1306 | target[1] = ':'; |
| 1307 | } |
| 1308 | /* Reinsert the escape prefix if required. */ |
| 1309 | if (is_escaped) |
| 1310 | { |
| 1311 | target -= 2; |
| 1312 | target[0] = '/'; |
| 1313 | target[1] = ':'; |
| 1314 | } |
| 1315 | dostounix_filename (target); |
| 1316 | #endif /* DOS_NT */ |
| 1317 | |
| 1318 | result = make_specified_string (target, -1, o - target, multibyte); |
| 1319 | } |
| 1320 | |
| 1321 | /* Again look to see if the file name has special constructs in it |
| 1322 | and perhaps call the corresponding file handler. This is needed |
| 1323 | for filenames such as "/foo/../user@host:/bar/../baz". Expanding |
| 1324 | the ".." component gives us "/user@host:/bar/../baz" which needs |
| 1325 | to be expanded again. */ |
| 1326 | handler = Ffind_file_name_handler (result, Qexpand_file_name); |
| 1327 | if (!NILP (handler)) |
| 1328 | { |
| 1329 | handled_name = call3 (handler, Qexpand_file_name, |
| 1330 | result, default_directory); |
| 1331 | if (STRINGP (handled_name)) |
| 1332 | return handled_name; |
| 1333 | error ("Invalid handler in `file-name-handler-alist'"); |
| 1334 | } |
| 1335 | |
| 1336 | return result; |
| 1337 | } |
| 1338 | |
| 1339 | #if 0 |
| 1340 | /* PLEASE DO NOT DELETE THIS COMMENTED-OUT VERSION! |
| 1341 | This is the old version of expand-file-name, before it was thoroughly |
| 1342 | rewritten for Emacs 10.31. We leave this version here commented-out, |
| 1343 | because the code is very complex and likely to have subtle bugs. If |
| 1344 | bugs _are_ found, it might be of interest to look at the old code and |
| 1345 | see what did it do in the relevant situation. |
| 1346 | |
| 1347 | Don't remove this code: it's true that it will be accessible |
| 1348 | from the repository, but a few years from deletion, people will |
| 1349 | forget it is there. */ |
| 1350 | |
| 1351 | /* Changed this DEFUN to a DEAFUN, so as not to confuse `make-docfile'. */ |
| 1352 | DEAFUN ("expand-file-name", Fexpand_file_name, Sexpand_file_name, 1, 2, 0, |
| 1353 | "Convert FILENAME to absolute, and canonicalize it.\n\ |
| 1354 | Second arg DEFAULT is directory to start with if FILENAME is relative\n\ |
| 1355 | \(does not start with slash); if DEFAULT is nil or missing,\n\ |
| 1356 | the current buffer's value of default-directory is used.\n\ |
| 1357 | Filenames containing `.' or `..' as components are simplified;\n\ |
| 1358 | initial `~/' expands to your home directory.\n\ |
| 1359 | See also the function `substitute-in-file-name'.") |
| 1360 | (name, defalt) |
| 1361 | Lisp_Object name, defalt; |
| 1362 | { |
| 1363 | unsigned char *nm; |
| 1364 | |
| 1365 | register unsigned char *newdir, *p, *o; |
| 1366 | ptrdiff_t tlen; |
| 1367 | unsigned char *target; |
| 1368 | struct passwd *pw; |
| 1369 | int lose; |
| 1370 | |
| 1371 | CHECK_STRING (name); |
| 1372 | nm = SDATA (name); |
| 1373 | |
| 1374 | /* If nm is absolute, flush ...// and detect /./ and /../. |
| 1375 | If no /./ or /../ we can return right away. */ |
| 1376 | if (nm[0] == '/') |
| 1377 | { |
| 1378 | p = nm; |
| 1379 | lose = 0; |
| 1380 | while (*p) |
| 1381 | { |
| 1382 | if (p[0] == '/' && p[1] == '/' |
| 1383 | ) |
| 1384 | nm = p + 1; |
| 1385 | if (p[0] == '/' && p[1] == '~') |
| 1386 | nm = p + 1, lose = 1; |
| 1387 | if (p[0] == '/' && p[1] == '.' |
| 1388 | && (p[2] == '/' || p[2] == 0 |
| 1389 | || (p[2] == '.' && (p[3] == '/' || p[3] == 0)))) |
| 1390 | lose = 1; |
| 1391 | p++; |
| 1392 | } |
| 1393 | if (!lose) |
| 1394 | { |
| 1395 | if (nm == SDATA (name)) |
| 1396 | return name; |
| 1397 | return build_string (nm); |
| 1398 | } |
| 1399 | } |
| 1400 | |
| 1401 | /* Now determine directory to start with and put it in NEWDIR. */ |
| 1402 | |
| 1403 | newdir = 0; |
| 1404 | |
| 1405 | if (nm[0] == '~') /* prefix ~ */ |
| 1406 | if (nm[1] == '/' || nm[1] == 0)/* ~/filename */ |
| 1407 | { |
| 1408 | if (!(newdir = (unsigned char *) egetenv ("HOME"))) |
| 1409 | newdir = (unsigned char *) ""; |
| 1410 | nm++; |
| 1411 | } |
| 1412 | else /* ~user/filename */ |
| 1413 | { |
| 1414 | /* Get past ~ to user. */ |
| 1415 | unsigned char *user = nm + 1; |
| 1416 | /* Find end of name. */ |
| 1417 | unsigned char *ptr = (unsigned char *) strchr (user, '/'); |
| 1418 | ptrdiff_t len = ptr ? ptr - user : strlen (user); |
| 1419 | /* Copy the user name into temp storage. */ |
| 1420 | o = alloca (len + 1); |
| 1421 | memcpy (o, user, len); |
| 1422 | o[len] = 0; |
| 1423 | |
| 1424 | /* Look up the user name. */ |
| 1425 | BLOCK_INPUT; |
| 1426 | pw = (struct passwd *) getpwnam (o + 1); |
| 1427 | UNBLOCK_INPUT; |
| 1428 | if (!pw) |
| 1429 | error ("\"%s\" isn't a registered user", o + 1); |
| 1430 | |
| 1431 | newdir = (unsigned char *) pw->pw_dir; |
| 1432 | |
| 1433 | /* Discard the user name from NM. */ |
| 1434 | nm += len; |
| 1435 | } |
| 1436 | |
| 1437 | if (nm[0] != '/' && !newdir) |
| 1438 | { |
| 1439 | if (NILP (defalt)) |
| 1440 | defalt = current_buffer->directory; |
| 1441 | CHECK_STRING (defalt); |
| 1442 | newdir = SDATA (defalt); |
| 1443 | } |
| 1444 | |
| 1445 | /* Now concatenate the directory and name to new space in the stack frame. */ |
| 1446 | |
| 1447 | tlen = (newdir ? strlen (newdir) + 1 : 0) + strlen (nm) + 1; |
| 1448 | target = alloca (tlen); |
| 1449 | *target = 0; |
| 1450 | |
| 1451 | if (newdir) |
| 1452 | { |
| 1453 | if (nm[0] == 0 || nm[0] == '/') |
| 1454 | strcpy (target, newdir); |
| 1455 | else |
| 1456 | file_name_as_directory (target, newdir); |
| 1457 | } |
| 1458 | |
| 1459 | strcat (target, nm); |
| 1460 | |
| 1461 | /* Now canonicalize by removing /. and /foo/.. if they appear. */ |
| 1462 | |
| 1463 | p = target; |
| 1464 | o = target; |
| 1465 | |
| 1466 | while (*p) |
| 1467 | { |
| 1468 | if (*p != '/') |
| 1469 | { |
| 1470 | *o++ = *p++; |
| 1471 | } |
| 1472 | else if (!strncmp (p, "//", 2) |
| 1473 | ) |
| 1474 | { |
| 1475 | o = target; |
| 1476 | p++; |
| 1477 | } |
| 1478 | else if (p[0] == '/' && p[1] == '.' |
| 1479 | && (p[2] == '/' || p[2] == 0)) |
| 1480 | p += 2; |
| 1481 | else if (!strncmp (p, "/..", 3) |
| 1482 | /* `/../' is the "superroot" on certain file systems. */ |
| 1483 | && o != target |
| 1484 | && (p[3] == '/' || p[3] == 0)) |
| 1485 | { |
| 1486 | while (o != target && *--o != '/') |
| 1487 | ; |
| 1488 | if (o == target && *o == '/') |
| 1489 | ++o; |
| 1490 | p += 3; |
| 1491 | } |
| 1492 | else |
| 1493 | { |
| 1494 | *o++ = *p++; |
| 1495 | } |
| 1496 | } |
| 1497 | |
| 1498 | return make_string (target, o - target); |
| 1499 | } |
| 1500 | #endif |
| 1501 | \f |
| 1502 | /* If /~ or // appears, discard everything through first slash. */ |
| 1503 | static int |
| 1504 | file_name_absolute_p (const char *filename) |
| 1505 | { |
| 1506 | return |
| 1507 | (IS_DIRECTORY_SEP (*filename) || *filename == '~' |
| 1508 | #ifdef DOS_NT |
| 1509 | || (IS_DRIVE (*filename) && IS_DEVICE_SEP (filename[1]) |
| 1510 | && IS_DIRECTORY_SEP (filename[2])) |
| 1511 | #endif |
| 1512 | ); |
| 1513 | } |
| 1514 | |
| 1515 | static char * |
| 1516 | search_embedded_absfilename (char *nm, char *endp) |
| 1517 | { |
| 1518 | char *p, *s; |
| 1519 | |
| 1520 | for (p = nm + 1; p < endp; p++) |
| 1521 | { |
| 1522 | if ((0 |
| 1523 | || IS_DIRECTORY_SEP (p[-1])) |
| 1524 | && file_name_absolute_p (p) |
| 1525 | #if defined (WINDOWSNT) || defined (CYGWIN) |
| 1526 | /* // at start of file name is meaningful in Apollo, |
| 1527 | WindowsNT and Cygwin systems. */ |
| 1528 | && !(IS_DIRECTORY_SEP (p[0]) && p - 1 == nm) |
| 1529 | #endif /* not (WINDOWSNT || CYGWIN) */ |
| 1530 | ) |
| 1531 | { |
| 1532 | for (s = p; *s && (!IS_DIRECTORY_SEP (*s)); s++); |
| 1533 | if (p[0] == '~' && s > p + 1) /* We've got "/~something/". */ |
| 1534 | { |
| 1535 | char *o = alloca (s - p + 1); |
| 1536 | struct passwd *pw; |
| 1537 | memcpy (o, p, s - p); |
| 1538 | o [s - p] = 0; |
| 1539 | |
| 1540 | /* If we have ~user and `user' exists, discard |
| 1541 | everything up to ~. But if `user' does not exist, leave |
| 1542 | ~user alone, it might be a literal file name. */ |
| 1543 | BLOCK_INPUT; |
| 1544 | pw = getpwnam (o + 1); |
| 1545 | UNBLOCK_INPUT; |
| 1546 | if (pw) |
| 1547 | return p; |
| 1548 | } |
| 1549 | else |
| 1550 | return p; |
| 1551 | } |
| 1552 | } |
| 1553 | return NULL; |
| 1554 | } |
| 1555 | |
| 1556 | DEFUN ("substitute-in-file-name", Fsubstitute_in_file_name, |
| 1557 | Ssubstitute_in_file_name, 1, 1, 0, |
| 1558 | doc: /* Substitute environment variables referred to in FILENAME. |
| 1559 | `$FOO' where FOO is an environment variable name means to substitute |
| 1560 | the value of that variable. The variable name should be terminated |
| 1561 | with a character not a letter, digit or underscore; otherwise, enclose |
| 1562 | the entire variable name in braces. |
| 1563 | |
| 1564 | If `/~' appears, all of FILENAME through that `/' is discarded. |
| 1565 | If `//' appears, everything up to and including the first of |
| 1566 | those `/' is discarded. */) |
| 1567 | (Lisp_Object filename) |
| 1568 | { |
| 1569 | char *nm; |
| 1570 | |
| 1571 | register char *s, *p, *o, *x, *endp; |
| 1572 | char *target = NULL; |
| 1573 | int total = 0; |
| 1574 | int substituted = 0; |
| 1575 | int multibyte; |
| 1576 | char *xnm; |
| 1577 | Lisp_Object handler; |
| 1578 | |
| 1579 | CHECK_STRING (filename); |
| 1580 | |
| 1581 | multibyte = STRING_MULTIBYTE (filename); |
| 1582 | |
| 1583 | /* If the file name has special constructs in it, |
| 1584 | call the corresponding file handler. */ |
| 1585 | handler = Ffind_file_name_handler (filename, Qsubstitute_in_file_name); |
| 1586 | if (!NILP (handler)) |
| 1587 | { |
| 1588 | Lisp_Object handled_name = call2 (handler, Qsubstitute_in_file_name, |
| 1589 | filename); |
| 1590 | if (STRINGP (handled_name)) |
| 1591 | return handled_name; |
| 1592 | error ("Invalid handler in `file-name-handler-alist'"); |
| 1593 | } |
| 1594 | |
| 1595 | /* Always work on a copy of the string, in case GC happens during |
| 1596 | decode of environment variables, causing the original Lisp_String |
| 1597 | data to be relocated. */ |
| 1598 | nm = alloca (SBYTES (filename) + 1); |
| 1599 | memcpy (nm, SDATA (filename), SBYTES (filename) + 1); |
| 1600 | |
| 1601 | #ifdef DOS_NT |
| 1602 | dostounix_filename (nm); |
| 1603 | substituted = (strcmp (nm, SDATA (filename)) != 0); |
| 1604 | #endif |
| 1605 | endp = nm + SBYTES (filename); |
| 1606 | |
| 1607 | /* If /~ or // appears, discard everything through first slash. */ |
| 1608 | p = search_embedded_absfilename (nm, endp); |
| 1609 | if (p) |
| 1610 | /* Start over with the new string, so we check the file-name-handler |
| 1611 | again. Important with filenames like "/home/foo//:/hello///there" |
| 1612 | which would substitute to "/:/hello///there" rather than "/there". */ |
| 1613 | return Fsubstitute_in_file_name |
| 1614 | (make_specified_string (p, -1, endp - p, multibyte)); |
| 1615 | |
| 1616 | /* See if any variables are substituted into the string |
| 1617 | and find the total length of their values in `total'. */ |
| 1618 | |
| 1619 | for (p = nm; p != endp;) |
| 1620 | if (*p != '$') |
| 1621 | p++; |
| 1622 | else |
| 1623 | { |
| 1624 | p++; |
| 1625 | if (p == endp) |
| 1626 | goto badsubst; |
| 1627 | else if (*p == '$') |
| 1628 | { |
| 1629 | /* "$$" means a single "$". */ |
| 1630 | p++; |
| 1631 | total -= 1; |
| 1632 | substituted = 1; |
| 1633 | continue; |
| 1634 | } |
| 1635 | else if (*p == '{') |
| 1636 | { |
| 1637 | o = ++p; |
| 1638 | while (p != endp && *p != '}') p++; |
| 1639 | if (*p != '}') goto missingclose; |
| 1640 | s = p; |
| 1641 | } |
| 1642 | else |
| 1643 | { |
| 1644 | o = p; |
| 1645 | while (p != endp && (isalnum (*p) || *p == '_')) p++; |
| 1646 | s = p; |
| 1647 | } |
| 1648 | |
| 1649 | /* Copy out the variable name. */ |
| 1650 | target = alloca (s - o + 1); |
| 1651 | memcpy (target, o, s - o); |
| 1652 | target[s - o] = 0; |
| 1653 | #ifdef DOS_NT |
| 1654 | strupr (target); /* $home == $HOME etc. */ |
| 1655 | #endif /* DOS_NT */ |
| 1656 | |
| 1657 | /* Get variable value. */ |
| 1658 | o = egetenv (target); |
| 1659 | if (o) |
| 1660 | { |
| 1661 | /* Don't try to guess a maximum length - UTF8 can use up to |
| 1662 | four bytes per character. This code is unlikely to run |
| 1663 | in a situation that requires performance, so decoding the |
| 1664 | env variables twice should be acceptable. Note that |
| 1665 | decoding may cause a garbage collect. */ |
| 1666 | Lisp_Object orig, decoded; |
| 1667 | orig = make_unibyte_string (o, strlen (o)); |
| 1668 | decoded = DECODE_FILE (orig); |
| 1669 | total += SBYTES (decoded); |
| 1670 | substituted = 1; |
| 1671 | } |
| 1672 | else if (*p == '}') |
| 1673 | goto badvar; |
| 1674 | } |
| 1675 | |
| 1676 | if (!substituted) |
| 1677 | return filename; |
| 1678 | |
| 1679 | /* If substitution required, recopy the string and do it. */ |
| 1680 | /* Make space in stack frame for the new copy. */ |
| 1681 | xnm = alloca (SBYTES (filename) + total + 1); |
| 1682 | x = xnm; |
| 1683 | |
| 1684 | /* Copy the rest of the name through, replacing $ constructs with values. */ |
| 1685 | for (p = nm; *p;) |
| 1686 | if (*p != '$') |
| 1687 | *x++ = *p++; |
| 1688 | else |
| 1689 | { |
| 1690 | p++; |
| 1691 | if (p == endp) |
| 1692 | goto badsubst; |
| 1693 | else if (*p == '$') |
| 1694 | { |
| 1695 | *x++ = *p++; |
| 1696 | continue; |
| 1697 | } |
| 1698 | else if (*p == '{') |
| 1699 | { |
| 1700 | o = ++p; |
| 1701 | while (p != endp && *p != '}') p++; |
| 1702 | if (*p != '}') goto missingclose; |
| 1703 | s = p++; |
| 1704 | } |
| 1705 | else |
| 1706 | { |
| 1707 | o = p; |
| 1708 | while (p != endp && (isalnum (*p) || *p == '_')) p++; |
| 1709 | s = p; |
| 1710 | } |
| 1711 | |
| 1712 | /* Copy out the variable name. */ |
| 1713 | target = alloca (s - o + 1); |
| 1714 | memcpy (target, o, s - o); |
| 1715 | target[s - o] = 0; |
| 1716 | #ifdef DOS_NT |
| 1717 | strupr (target); /* $home == $HOME etc. */ |
| 1718 | #endif /* DOS_NT */ |
| 1719 | |
| 1720 | /* Get variable value. */ |
| 1721 | o = egetenv (target); |
| 1722 | if (!o) |
| 1723 | { |
| 1724 | *x++ = '$'; |
| 1725 | strcpy (x, target); x+= strlen (target); |
| 1726 | } |
| 1727 | else |
| 1728 | { |
| 1729 | Lisp_Object orig, decoded; |
| 1730 | ptrdiff_t orig_length, decoded_length; |
| 1731 | orig_length = strlen (o); |
| 1732 | orig = make_unibyte_string (o, orig_length); |
| 1733 | decoded = DECODE_FILE (orig); |
| 1734 | decoded_length = SBYTES (decoded); |
| 1735 | memcpy (x, SDATA (decoded), decoded_length); |
| 1736 | x += decoded_length; |
| 1737 | |
| 1738 | /* If environment variable needed decoding, return value |
| 1739 | needs to be multibyte. */ |
| 1740 | if (decoded_length != orig_length |
| 1741 | || memcmp (SDATA (decoded), o, orig_length)) |
| 1742 | multibyte = 1; |
| 1743 | } |
| 1744 | } |
| 1745 | |
| 1746 | *x = 0; |
| 1747 | |
| 1748 | /* If /~ or // appears, discard everything through first slash. */ |
| 1749 | while ((p = search_embedded_absfilename (xnm, x))) |
| 1750 | /* This time we do not start over because we've already expanded envvars |
| 1751 | and replaced $$ with $. Maybe we should start over as well, but we'd |
| 1752 | need to quote some $ to $$ first. */ |
| 1753 | xnm = p; |
| 1754 | |
| 1755 | return make_specified_string (xnm, -1, x - xnm, multibyte); |
| 1756 | |
| 1757 | badsubst: |
| 1758 | error ("Bad format environment-variable substitution"); |
| 1759 | missingclose: |
| 1760 | error ("Missing \"}\" in environment-variable substitution"); |
| 1761 | badvar: |
| 1762 | error ("Substituting nonexistent environment variable \"%s\"", target); |
| 1763 | |
| 1764 | /* NOTREACHED */ |
| 1765 | return Qnil; |
| 1766 | } |
| 1767 | \f |
| 1768 | /* A slightly faster and more convenient way to get |
| 1769 | (directory-file-name (expand-file-name FOO)). */ |
| 1770 | |
| 1771 | Lisp_Object |
| 1772 | expand_and_dir_to_file (Lisp_Object filename, Lisp_Object defdir) |
| 1773 | { |
| 1774 | register Lisp_Object absname; |
| 1775 | |
| 1776 | absname = Fexpand_file_name (filename, defdir); |
| 1777 | |
| 1778 | /* Remove final slash, if any (unless this is the root dir). |
| 1779 | stat behaves differently depending! */ |
| 1780 | if (SCHARS (absname) > 1 |
| 1781 | && IS_DIRECTORY_SEP (SREF (absname, SBYTES (absname) - 1)) |
| 1782 | && !IS_DEVICE_SEP (SREF (absname, SBYTES (absname) - 2))) |
| 1783 | /* We cannot take shortcuts; they might be wrong for magic file names. */ |
| 1784 | absname = Fdirectory_file_name (absname); |
| 1785 | return absname; |
| 1786 | } |
| 1787 | \f |
| 1788 | /* Signal an error if the file ABSNAME already exists. |
| 1789 | If INTERACTIVE is nonzero, ask the user whether to proceed, |
| 1790 | and bypass the error if the user says to go ahead. |
| 1791 | QUERYSTRING is a name for the action that is being considered |
| 1792 | to alter the file. |
| 1793 | |
| 1794 | *STATPTR is used to store the stat information if the file exists. |
| 1795 | If the file does not exist, STATPTR->st_mode is set to 0. |
| 1796 | If STATPTR is null, we don't store into it. |
| 1797 | |
| 1798 | If QUICK is nonzero, we ask for y or n, not yes or no. */ |
| 1799 | |
| 1800 | static void |
| 1801 | barf_or_query_if_file_exists (Lisp_Object absname, const char *querystring, |
| 1802 | int interactive, struct stat *statptr, int quick) |
| 1803 | { |
| 1804 | register Lisp_Object tem, encoded_filename; |
| 1805 | struct stat statbuf; |
| 1806 | struct gcpro gcpro1; |
| 1807 | |
| 1808 | encoded_filename = ENCODE_FILE (absname); |
| 1809 | |
| 1810 | /* `stat' is a good way to tell whether the file exists, |
| 1811 | regardless of what access permissions it has. */ |
| 1812 | if (lstat (SSDATA (encoded_filename), &statbuf) >= 0) |
| 1813 | { |
| 1814 | if (S_ISDIR (statbuf.st_mode)) |
| 1815 | xsignal2 (Qfile_error, |
| 1816 | build_string ("File is a directory"), absname); |
| 1817 | |
| 1818 | if (! interactive) |
| 1819 | xsignal2 (Qfile_already_exists, |
| 1820 | build_string ("File already exists"), absname); |
| 1821 | GCPRO1 (absname); |
| 1822 | tem = format2 ("File %s already exists; %s anyway? ", |
| 1823 | absname, build_string (querystring)); |
| 1824 | if (quick) |
| 1825 | tem = call1 (intern ("y-or-n-p"), tem); |
| 1826 | else |
| 1827 | tem = do_yes_or_no_p (tem); |
| 1828 | UNGCPRO; |
| 1829 | if (NILP (tem)) |
| 1830 | xsignal2 (Qfile_already_exists, |
| 1831 | build_string ("File already exists"), absname); |
| 1832 | if (statptr) |
| 1833 | *statptr = statbuf; |
| 1834 | } |
| 1835 | else |
| 1836 | { |
| 1837 | if (statptr) |
| 1838 | statptr->st_mode = 0; |
| 1839 | } |
| 1840 | return; |
| 1841 | } |
| 1842 | |
| 1843 | DEFUN ("copy-file", Fcopy_file, Scopy_file, 2, 6, |
| 1844 | "fCopy file: \nGCopy %s to file: \np\nP", |
| 1845 | doc: /* Copy FILE to NEWNAME. Both args must be strings. |
| 1846 | If NEWNAME names a directory, copy FILE there. |
| 1847 | |
| 1848 | This function always sets the file modes of the output file to match |
| 1849 | the input file. |
| 1850 | |
| 1851 | The optional third argument OK-IF-ALREADY-EXISTS specifies what to do |
| 1852 | if file NEWNAME already exists. If OK-IF-ALREADY-EXISTS is nil, we |
| 1853 | signal a `file-already-exists' error without overwriting. If |
| 1854 | OK-IF-ALREADY-EXISTS is a number, we request confirmation from the user |
| 1855 | about overwriting; this is what happens in interactive use with M-x. |
| 1856 | Any other value for OK-IF-ALREADY-EXISTS means to overwrite the |
| 1857 | existing file. |
| 1858 | |
| 1859 | Fourth arg KEEP-TIME non-nil means give the output file the same |
| 1860 | last-modified time as the old one. (This works on only some systems.) |
| 1861 | |
| 1862 | A prefix arg makes KEEP-TIME non-nil. |
| 1863 | |
| 1864 | If PRESERVE-UID-GID is non-nil, we try to transfer the |
| 1865 | uid and gid of FILE to NEWNAME. |
| 1866 | |
| 1867 | If PRESERVE-SELINUX-CONTEXT is non-nil and SELinux is enabled |
| 1868 | on the system, we copy the SELinux context of FILE to NEWNAME. */) |
| 1869 | (Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists, Lisp_Object keep_time, Lisp_Object preserve_uid_gid, Lisp_Object preserve_selinux_context) |
| 1870 | { |
| 1871 | int ifd, ofd; |
| 1872 | int n; |
| 1873 | char buf[16 * 1024]; |
| 1874 | struct stat st, out_st; |
| 1875 | Lisp_Object handler; |
| 1876 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; |
| 1877 | ptrdiff_t count = SPECPDL_INDEX (); |
| 1878 | int input_file_statable_p; |
| 1879 | Lisp_Object encoded_file, encoded_newname; |
| 1880 | #if HAVE_LIBSELINUX |
| 1881 | security_context_t con; |
| 1882 | int fail, conlength = 0; |
| 1883 | #endif |
| 1884 | |
| 1885 | encoded_file = encoded_newname = Qnil; |
| 1886 | GCPRO4 (file, newname, encoded_file, encoded_newname); |
| 1887 | CHECK_STRING (file); |
| 1888 | CHECK_STRING (newname); |
| 1889 | |
| 1890 | if (!NILP (Ffile_directory_p (newname))) |
| 1891 | newname = Fexpand_file_name (Ffile_name_nondirectory (file), newname); |
| 1892 | else |
| 1893 | newname = Fexpand_file_name (newname, Qnil); |
| 1894 | |
| 1895 | file = Fexpand_file_name (file, Qnil); |
| 1896 | |
| 1897 | /* If the input file name has special constructs in it, |
| 1898 | call the corresponding file handler. */ |
| 1899 | handler = Ffind_file_name_handler (file, Qcopy_file); |
| 1900 | /* Likewise for output file name. */ |
| 1901 | if (NILP (handler)) |
| 1902 | handler = Ffind_file_name_handler (newname, Qcopy_file); |
| 1903 | if (!NILP (handler)) |
| 1904 | RETURN_UNGCPRO (call7 (handler, Qcopy_file, file, newname, |
| 1905 | ok_if_already_exists, keep_time, preserve_uid_gid, |
| 1906 | preserve_selinux_context)); |
| 1907 | |
| 1908 | encoded_file = ENCODE_FILE (file); |
| 1909 | encoded_newname = ENCODE_FILE (newname); |
| 1910 | |
| 1911 | if (NILP (ok_if_already_exists) |
| 1912 | || INTEGERP (ok_if_already_exists)) |
| 1913 | barf_or_query_if_file_exists (newname, "copy to it", |
| 1914 | INTEGERP (ok_if_already_exists), &out_st, 0); |
| 1915 | else if (stat (SSDATA (encoded_newname), &out_st) < 0) |
| 1916 | out_st.st_mode = 0; |
| 1917 | |
| 1918 | #ifdef WINDOWSNT |
| 1919 | if (!CopyFile (SDATA (encoded_file), |
| 1920 | SDATA (encoded_newname), |
| 1921 | FALSE)) |
| 1922 | report_file_error ("Copying file", Fcons (file, Fcons (newname, Qnil))); |
| 1923 | /* CopyFile retains the timestamp by default. */ |
| 1924 | else if (NILP (keep_time)) |
| 1925 | { |
| 1926 | EMACS_TIME now; |
| 1927 | DWORD attributes; |
| 1928 | char * filename; |
| 1929 | |
| 1930 | EMACS_GET_TIME (now); |
| 1931 | filename = SDATA (encoded_newname); |
| 1932 | |
| 1933 | /* Ensure file is writable while its modified time is set. */ |
| 1934 | attributes = GetFileAttributes (filename); |
| 1935 | SetFileAttributes (filename, attributes & ~FILE_ATTRIBUTE_READONLY); |
| 1936 | if (set_file_times (-1, filename, now, now)) |
| 1937 | { |
| 1938 | /* Restore original attributes. */ |
| 1939 | SetFileAttributes (filename, attributes); |
| 1940 | xsignal2 (Qfile_date_error, |
| 1941 | build_string ("Cannot set file date"), newname); |
| 1942 | } |
| 1943 | /* Restore original attributes. */ |
| 1944 | SetFileAttributes (filename, attributes); |
| 1945 | } |
| 1946 | #else /* not WINDOWSNT */ |
| 1947 | immediate_quit = 1; |
| 1948 | ifd = emacs_open (SSDATA (encoded_file), O_RDONLY, 0); |
| 1949 | immediate_quit = 0; |
| 1950 | |
| 1951 | if (ifd < 0) |
| 1952 | report_file_error ("Opening input file", Fcons (file, Qnil)); |
| 1953 | |
| 1954 | record_unwind_protect (close_file_unwind, make_number (ifd)); |
| 1955 | |
| 1956 | /* We can only copy regular files and symbolic links. Other files are not |
| 1957 | copyable by us. */ |
| 1958 | input_file_statable_p = (fstat (ifd, &st) >= 0); |
| 1959 | |
| 1960 | #if HAVE_LIBSELINUX |
| 1961 | if (!NILP (preserve_selinux_context) && is_selinux_enabled ()) |
| 1962 | { |
| 1963 | conlength = fgetfilecon (ifd, &con); |
| 1964 | if (conlength == -1) |
| 1965 | report_file_error ("Doing fgetfilecon", Fcons (file, Qnil)); |
| 1966 | } |
| 1967 | #endif |
| 1968 | |
| 1969 | if (out_st.st_mode != 0 |
| 1970 | && st.st_dev == out_st.st_dev && st.st_ino == out_st.st_ino) |
| 1971 | { |
| 1972 | errno = 0; |
| 1973 | report_file_error ("Input and output files are the same", |
| 1974 | Fcons (file, Fcons (newname, Qnil))); |
| 1975 | } |
| 1976 | |
| 1977 | if (input_file_statable_p) |
| 1978 | { |
| 1979 | if (!(S_ISREG (st.st_mode)) && !(S_ISLNK (st.st_mode))) |
| 1980 | { |
| 1981 | #if defined (EISDIR) |
| 1982 | /* Get a better looking error message. */ |
| 1983 | errno = EISDIR; |
| 1984 | #endif /* EISDIR */ |
| 1985 | report_file_error ("Non-regular file", Fcons (file, Qnil)); |
| 1986 | } |
| 1987 | } |
| 1988 | |
| 1989 | #ifdef MSDOS |
| 1990 | /* System's default file type was set to binary by _fmode in emacs.c. */ |
| 1991 | ofd = emacs_open (SDATA (encoded_newname), |
| 1992 | O_WRONLY | O_TRUNC | O_CREAT |
| 1993 | | (NILP (ok_if_already_exists) ? O_EXCL : 0), |
| 1994 | S_IREAD | S_IWRITE); |
| 1995 | #else /* not MSDOS */ |
| 1996 | { |
| 1997 | int new_mask = 0666; |
| 1998 | if (input_file_statable_p) |
| 1999 | { |
| 2000 | if (!NILP (preserve_uid_gid)) |
| 2001 | new_mask = 0600; |
| 2002 | new_mask &= st.st_mode; |
| 2003 | } |
| 2004 | ofd = emacs_open (SSDATA (encoded_newname), |
| 2005 | (O_WRONLY | O_TRUNC | O_CREAT |
| 2006 | | (NILP (ok_if_already_exists) ? O_EXCL : 0)), |
| 2007 | new_mask); |
| 2008 | } |
| 2009 | #endif /* not MSDOS */ |
| 2010 | if (ofd < 0) |
| 2011 | report_file_error ("Opening output file", Fcons (newname, Qnil)); |
| 2012 | |
| 2013 | record_unwind_protect (close_file_unwind, make_number (ofd)); |
| 2014 | |
| 2015 | immediate_quit = 1; |
| 2016 | QUIT; |
| 2017 | while ((n = emacs_read (ifd, buf, sizeof buf)) > 0) |
| 2018 | if (emacs_write (ofd, buf, n) != n) |
| 2019 | report_file_error ("I/O error", Fcons (newname, Qnil)); |
| 2020 | immediate_quit = 0; |
| 2021 | |
| 2022 | #ifndef MSDOS |
| 2023 | /* Preserve the original file modes, and if requested, also its |
| 2024 | owner and group. */ |
| 2025 | if (input_file_statable_p) |
| 2026 | { |
| 2027 | int mode_mask = 07777; |
| 2028 | if (!NILP (preserve_uid_gid)) |
| 2029 | { |
| 2030 | /* Attempt to change owner and group. If that doesn't work |
| 2031 | attempt to change just the group, as that is sometimes allowed. |
| 2032 | Adjust the mode mask to eliminate setuid or setgid bits |
| 2033 | that are inappropriate if the owner and group are wrong. */ |
| 2034 | if (fchown (ofd, st.st_uid, st.st_gid) != 0) |
| 2035 | { |
| 2036 | mode_mask &= ~06000; |
| 2037 | if (fchown (ofd, -1, st.st_gid) == 0) |
| 2038 | mode_mask |= 02000; |
| 2039 | } |
| 2040 | } |
| 2041 | if (fchmod (ofd, st.st_mode & mode_mask) != 0) |
| 2042 | report_file_error ("Doing chmod", Fcons (newname, Qnil)); |
| 2043 | } |
| 2044 | #endif /* not MSDOS */ |
| 2045 | |
| 2046 | #if HAVE_LIBSELINUX |
| 2047 | if (conlength > 0) |
| 2048 | { |
| 2049 | /* Set the modified context back to the file. */ |
| 2050 | fail = fsetfilecon (ofd, con); |
| 2051 | /* See http://debbugs.gnu.org/11245 for ENOTSUP. */ |
| 2052 | if (fail && errno != ENOTSUP) |
| 2053 | report_file_error ("Doing fsetfilecon", Fcons (newname, Qnil)); |
| 2054 | |
| 2055 | freecon (con); |
| 2056 | } |
| 2057 | #endif |
| 2058 | |
| 2059 | if (input_file_statable_p) |
| 2060 | { |
| 2061 | if (!NILP (keep_time)) |
| 2062 | { |
| 2063 | EMACS_TIME atime = get_stat_atime (&st); |
| 2064 | EMACS_TIME mtime = get_stat_mtime (&st); |
| 2065 | if (set_file_times (ofd, SSDATA (encoded_newname), atime, mtime)) |
| 2066 | xsignal2 (Qfile_date_error, |
| 2067 | build_string ("Cannot set file date"), newname); |
| 2068 | } |
| 2069 | } |
| 2070 | |
| 2071 | if (emacs_close (ofd) < 0) |
| 2072 | report_file_error ("I/O error", Fcons (newname, Qnil)); |
| 2073 | |
| 2074 | emacs_close (ifd); |
| 2075 | |
| 2076 | #ifdef MSDOS |
| 2077 | if (input_file_statable_p) |
| 2078 | { |
| 2079 | /* In DJGPP v2.0 and later, fstat usually returns true file mode bits, |
| 2080 | and if it can't, it tells so. Otherwise, under MSDOS we usually |
| 2081 | get only the READ bit, which will make the copied file read-only, |
| 2082 | so it's better not to chmod at all. */ |
| 2083 | if ((_djstat_flags & _STFAIL_WRITEBIT) == 0) |
| 2084 | chmod (SDATA (encoded_newname), st.st_mode & 07777); |
| 2085 | } |
| 2086 | #endif /* MSDOS */ |
| 2087 | #endif /* not WINDOWSNT */ |
| 2088 | |
| 2089 | /* Discard the unwind protects. */ |
| 2090 | specpdl_ptr = specpdl + count; |
| 2091 | |
| 2092 | UNGCPRO; |
| 2093 | return Qnil; |
| 2094 | } |
| 2095 | \f |
| 2096 | DEFUN ("make-directory-internal", Fmake_directory_internal, |
| 2097 | Smake_directory_internal, 1, 1, 0, |
| 2098 | doc: /* Create a new directory named DIRECTORY. */) |
| 2099 | (Lisp_Object directory) |
| 2100 | { |
| 2101 | const char *dir; |
| 2102 | Lisp_Object handler; |
| 2103 | Lisp_Object encoded_dir; |
| 2104 | |
| 2105 | CHECK_STRING (directory); |
| 2106 | directory = Fexpand_file_name (directory, Qnil); |
| 2107 | |
| 2108 | handler = Ffind_file_name_handler (directory, Qmake_directory_internal); |
| 2109 | if (!NILP (handler)) |
| 2110 | return call2 (handler, Qmake_directory_internal, directory); |
| 2111 | |
| 2112 | encoded_dir = ENCODE_FILE (directory); |
| 2113 | |
| 2114 | dir = SSDATA (encoded_dir); |
| 2115 | |
| 2116 | #ifdef WINDOWSNT |
| 2117 | if (mkdir (dir) != 0) |
| 2118 | #else |
| 2119 | if (mkdir (dir, 0777 & ~auto_saving_dir_umask) != 0) |
| 2120 | #endif |
| 2121 | report_file_error ("Creating directory", list1 (directory)); |
| 2122 | |
| 2123 | return Qnil; |
| 2124 | } |
| 2125 | |
| 2126 | DEFUN ("delete-directory-internal", Fdelete_directory_internal, |
| 2127 | Sdelete_directory_internal, 1, 1, 0, |
| 2128 | doc: /* Delete the directory named DIRECTORY. Does not follow symlinks. */) |
| 2129 | (Lisp_Object directory) |
| 2130 | { |
| 2131 | const char *dir; |
| 2132 | Lisp_Object encoded_dir; |
| 2133 | |
| 2134 | CHECK_STRING (directory); |
| 2135 | directory = Fdirectory_file_name (Fexpand_file_name (directory, Qnil)); |
| 2136 | encoded_dir = ENCODE_FILE (directory); |
| 2137 | dir = SSDATA (encoded_dir); |
| 2138 | |
| 2139 | if (rmdir (dir) != 0) |
| 2140 | report_file_error ("Removing directory", list1 (directory)); |
| 2141 | |
| 2142 | return Qnil; |
| 2143 | } |
| 2144 | |
| 2145 | DEFUN ("delete-file", Fdelete_file, Sdelete_file, 1, 2, |
| 2146 | "(list (read-file-name \ |
| 2147 | (if (and delete-by-moving-to-trash (null current-prefix-arg)) \ |
| 2148 | \"Move file to trash: \" \"Delete file: \") \ |
| 2149 | nil default-directory (confirm-nonexistent-file-or-buffer)) \ |
| 2150 | (null current-prefix-arg))", |
| 2151 | doc: /* Delete file named FILENAME. If it is a symlink, remove the symlink. |
| 2152 | If file has multiple names, it continues to exist with the other names. |
| 2153 | TRASH non-nil means to trash the file instead of deleting, provided |
| 2154 | `delete-by-moving-to-trash' is non-nil. |
| 2155 | |
| 2156 | When called interactively, TRASH is t if no prefix argument is given. |
| 2157 | With a prefix argument, TRASH is nil. */) |
| 2158 | (Lisp_Object filename, Lisp_Object trash) |
| 2159 | { |
| 2160 | Lisp_Object handler; |
| 2161 | Lisp_Object encoded_file; |
| 2162 | struct gcpro gcpro1; |
| 2163 | |
| 2164 | GCPRO1 (filename); |
| 2165 | if (!NILP (Ffile_directory_p (filename)) |
| 2166 | && NILP (Ffile_symlink_p (filename))) |
| 2167 | xsignal2 (Qfile_error, |
| 2168 | build_string ("Removing old name: is a directory"), |
| 2169 | filename); |
| 2170 | UNGCPRO; |
| 2171 | filename = Fexpand_file_name (filename, Qnil); |
| 2172 | |
| 2173 | handler = Ffind_file_name_handler (filename, Qdelete_file); |
| 2174 | if (!NILP (handler)) |
| 2175 | return call3 (handler, Qdelete_file, filename, trash); |
| 2176 | |
| 2177 | if (delete_by_moving_to_trash && !NILP (trash)) |
| 2178 | return call1 (Qmove_file_to_trash, filename); |
| 2179 | |
| 2180 | encoded_file = ENCODE_FILE (filename); |
| 2181 | |
| 2182 | if (0 > unlink (SSDATA (encoded_file))) |
| 2183 | report_file_error ("Removing old name", list1 (filename)); |
| 2184 | return Qnil; |
| 2185 | } |
| 2186 | |
| 2187 | static Lisp_Object |
| 2188 | internal_delete_file_1 (Lisp_Object ignore) |
| 2189 | { |
| 2190 | return Qt; |
| 2191 | } |
| 2192 | |
| 2193 | /* Delete file FILENAME, returning 1 if successful and 0 if failed. |
| 2194 | This ignores `delete-by-moving-to-trash'. */ |
| 2195 | |
| 2196 | int |
| 2197 | internal_delete_file (Lisp_Object filename) |
| 2198 | { |
| 2199 | Lisp_Object tem; |
| 2200 | |
| 2201 | tem = internal_condition_case_2 (Fdelete_file, filename, Qnil, |
| 2202 | Qt, internal_delete_file_1); |
| 2203 | return NILP (tem); |
| 2204 | } |
| 2205 | \f |
| 2206 | DEFUN ("rename-file", Frename_file, Srename_file, 2, 3, |
| 2207 | "fRename file: \nGRename %s to file: \np", |
| 2208 | doc: /* Rename FILE as NEWNAME. Both args must be strings. |
| 2209 | If file has names other than FILE, it continues to have those names. |
| 2210 | Signals a `file-already-exists' error if a file NEWNAME already exists |
| 2211 | unless optional third argument OK-IF-ALREADY-EXISTS is non-nil. |
| 2212 | A number as third arg means request confirmation if NEWNAME already exists. |
| 2213 | This is what happens in interactive use with M-x. */) |
| 2214 | (Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists) |
| 2215 | { |
| 2216 | Lisp_Object handler; |
| 2217 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5; |
| 2218 | Lisp_Object encoded_file, encoded_newname, symlink_target; |
| 2219 | |
| 2220 | symlink_target = encoded_file = encoded_newname = Qnil; |
| 2221 | GCPRO5 (file, newname, encoded_file, encoded_newname, symlink_target); |
| 2222 | CHECK_STRING (file); |
| 2223 | CHECK_STRING (newname); |
| 2224 | file = Fexpand_file_name (file, Qnil); |
| 2225 | |
| 2226 | if ((!NILP (Ffile_directory_p (newname))) |
| 2227 | #ifdef DOS_NT |
| 2228 | /* If the file names are identical but for the case, |
| 2229 | don't attempt to move directory to itself. */ |
| 2230 | && (NILP (Fstring_equal (Fdowncase (file), Fdowncase (newname)))) |
| 2231 | #endif |
| 2232 | ) |
| 2233 | { |
| 2234 | Lisp_Object fname = NILP (Ffile_directory_p (file)) |
| 2235 | ? file : Fdirectory_file_name (file); |
| 2236 | newname = Fexpand_file_name (Ffile_name_nondirectory (fname), newname); |
| 2237 | } |
| 2238 | else |
| 2239 | newname = Fexpand_file_name (newname, Qnil); |
| 2240 | |
| 2241 | /* If the file name has special constructs in it, |
| 2242 | call the corresponding file handler. */ |
| 2243 | handler = Ffind_file_name_handler (file, Qrename_file); |
| 2244 | if (NILP (handler)) |
| 2245 | handler = Ffind_file_name_handler (newname, Qrename_file); |
| 2246 | if (!NILP (handler)) |
| 2247 | RETURN_UNGCPRO (call4 (handler, Qrename_file, |
| 2248 | file, newname, ok_if_already_exists)); |
| 2249 | |
| 2250 | encoded_file = ENCODE_FILE (file); |
| 2251 | encoded_newname = ENCODE_FILE (newname); |
| 2252 | |
| 2253 | #ifdef DOS_NT |
| 2254 | /* If the file names are identical but for the case, don't ask for |
| 2255 | confirmation: they simply want to change the letter-case of the |
| 2256 | file name. */ |
| 2257 | if (NILP (Fstring_equal (Fdowncase (file), Fdowncase (newname)))) |
| 2258 | #endif |
| 2259 | if (NILP (ok_if_already_exists) |
| 2260 | || INTEGERP (ok_if_already_exists)) |
| 2261 | barf_or_query_if_file_exists (newname, "rename to it", |
| 2262 | INTEGERP (ok_if_already_exists), 0, 0); |
| 2263 | if (0 > rename (SSDATA (encoded_file), SSDATA (encoded_newname))) |
| 2264 | { |
| 2265 | if (errno == EXDEV) |
| 2266 | { |
| 2267 | ptrdiff_t count; |
| 2268 | symlink_target = Ffile_symlink_p (file); |
| 2269 | if (! NILP (symlink_target)) |
| 2270 | Fmake_symbolic_link (symlink_target, newname, |
| 2271 | NILP (ok_if_already_exists) ? Qnil : Qt); |
| 2272 | else if (!NILP (Ffile_directory_p (file))) |
| 2273 | call4 (Qcopy_directory, file, newname, Qt, Qnil); |
| 2274 | else |
| 2275 | /* We have already prompted if it was an integer, so don't |
| 2276 | have copy-file prompt again. */ |
| 2277 | Fcopy_file (file, newname, |
| 2278 | NILP (ok_if_already_exists) ? Qnil : Qt, |
| 2279 | Qt, Qt, Qt); |
| 2280 | |
| 2281 | count = SPECPDL_INDEX (); |
| 2282 | specbind (Qdelete_by_moving_to_trash, Qnil); |
| 2283 | |
| 2284 | if (!NILP (Ffile_directory_p (file)) && NILP (symlink_target)) |
| 2285 | call2 (Qdelete_directory, file, Qt); |
| 2286 | else |
| 2287 | Fdelete_file (file, Qnil); |
| 2288 | unbind_to (count, Qnil); |
| 2289 | } |
| 2290 | else |
| 2291 | report_file_error ("Renaming", list2 (file, newname)); |
| 2292 | } |
| 2293 | UNGCPRO; |
| 2294 | return Qnil; |
| 2295 | } |
| 2296 | |
| 2297 | DEFUN ("add-name-to-file", Fadd_name_to_file, Sadd_name_to_file, 2, 3, |
| 2298 | "fAdd name to file: \nGName to add to %s: \np", |
| 2299 | doc: /* Give FILE additional name NEWNAME. Both args must be strings. |
| 2300 | Signals a `file-already-exists' error if a file NEWNAME already exists |
| 2301 | unless optional third argument OK-IF-ALREADY-EXISTS is non-nil. |
| 2302 | A number as third arg means request confirmation if NEWNAME already exists. |
| 2303 | This is what happens in interactive use with M-x. */) |
| 2304 | (Lisp_Object file, Lisp_Object newname, Lisp_Object ok_if_already_exists) |
| 2305 | { |
| 2306 | Lisp_Object handler; |
| 2307 | Lisp_Object encoded_file, encoded_newname; |
| 2308 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; |
| 2309 | |
| 2310 | GCPRO4 (file, newname, encoded_file, encoded_newname); |
| 2311 | encoded_file = encoded_newname = Qnil; |
| 2312 | CHECK_STRING (file); |
| 2313 | CHECK_STRING (newname); |
| 2314 | file = Fexpand_file_name (file, Qnil); |
| 2315 | |
| 2316 | if (!NILP (Ffile_directory_p (newname))) |
| 2317 | newname = Fexpand_file_name (Ffile_name_nondirectory (file), newname); |
| 2318 | else |
| 2319 | newname = Fexpand_file_name (newname, Qnil); |
| 2320 | |
| 2321 | /* If the file name has special constructs in it, |
| 2322 | call the corresponding file handler. */ |
| 2323 | handler = Ffind_file_name_handler (file, Qadd_name_to_file); |
| 2324 | if (!NILP (handler)) |
| 2325 | RETURN_UNGCPRO (call4 (handler, Qadd_name_to_file, file, |
| 2326 | newname, ok_if_already_exists)); |
| 2327 | |
| 2328 | /* If the new name has special constructs in it, |
| 2329 | call the corresponding file handler. */ |
| 2330 | handler = Ffind_file_name_handler (newname, Qadd_name_to_file); |
| 2331 | if (!NILP (handler)) |
| 2332 | RETURN_UNGCPRO (call4 (handler, Qadd_name_to_file, file, |
| 2333 | newname, ok_if_already_exists)); |
| 2334 | |
| 2335 | encoded_file = ENCODE_FILE (file); |
| 2336 | encoded_newname = ENCODE_FILE (newname); |
| 2337 | |
| 2338 | if (NILP (ok_if_already_exists) |
| 2339 | || INTEGERP (ok_if_already_exists)) |
| 2340 | barf_or_query_if_file_exists (newname, "make it a new name", |
| 2341 | INTEGERP (ok_if_already_exists), 0, 0); |
| 2342 | |
| 2343 | unlink (SSDATA (newname)); |
| 2344 | if (0 > link (SSDATA (encoded_file), SSDATA (encoded_newname))) |
| 2345 | report_file_error ("Adding new name", list2 (file, newname)); |
| 2346 | |
| 2347 | UNGCPRO; |
| 2348 | return Qnil; |
| 2349 | } |
| 2350 | |
| 2351 | DEFUN ("make-symbolic-link", Fmake_symbolic_link, Smake_symbolic_link, 2, 3, |
| 2352 | "FMake symbolic link to file: \nGMake symbolic link to file %s: \np", |
| 2353 | doc: /* Make a symbolic link to FILENAME, named LINKNAME. |
| 2354 | Both args must be strings. |
| 2355 | Signals a `file-already-exists' error if a file LINKNAME already exists |
| 2356 | unless optional third argument OK-IF-ALREADY-EXISTS is non-nil. |
| 2357 | A number as third arg means request confirmation if LINKNAME already exists. |
| 2358 | This happens for interactive use with M-x. */) |
| 2359 | (Lisp_Object filename, Lisp_Object linkname, Lisp_Object ok_if_already_exists) |
| 2360 | { |
| 2361 | Lisp_Object handler; |
| 2362 | Lisp_Object encoded_filename, encoded_linkname; |
| 2363 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; |
| 2364 | |
| 2365 | GCPRO4 (filename, linkname, encoded_filename, encoded_linkname); |
| 2366 | encoded_filename = encoded_linkname = Qnil; |
| 2367 | CHECK_STRING (filename); |
| 2368 | CHECK_STRING (linkname); |
| 2369 | /* If the link target has a ~, we must expand it to get |
| 2370 | a truly valid file name. Otherwise, do not expand; |
| 2371 | we want to permit links to relative file names. */ |
| 2372 | if (SREF (filename, 0) == '~') |
| 2373 | filename = Fexpand_file_name (filename, Qnil); |
| 2374 | |
| 2375 | if (!NILP (Ffile_directory_p (linkname))) |
| 2376 | linkname = Fexpand_file_name (Ffile_name_nondirectory (filename), linkname); |
| 2377 | else |
| 2378 | linkname = Fexpand_file_name (linkname, Qnil); |
| 2379 | |
| 2380 | /* If the file name has special constructs in it, |
| 2381 | call the corresponding file handler. */ |
| 2382 | handler = Ffind_file_name_handler (filename, Qmake_symbolic_link); |
| 2383 | if (!NILP (handler)) |
| 2384 | RETURN_UNGCPRO (call4 (handler, Qmake_symbolic_link, filename, |
| 2385 | linkname, ok_if_already_exists)); |
| 2386 | |
| 2387 | /* If the new link name has special constructs in it, |
| 2388 | call the corresponding file handler. */ |
| 2389 | handler = Ffind_file_name_handler (linkname, Qmake_symbolic_link); |
| 2390 | if (!NILP (handler)) |
| 2391 | RETURN_UNGCPRO (call4 (handler, Qmake_symbolic_link, filename, |
| 2392 | linkname, ok_if_already_exists)); |
| 2393 | |
| 2394 | encoded_filename = ENCODE_FILE (filename); |
| 2395 | encoded_linkname = ENCODE_FILE (linkname); |
| 2396 | |
| 2397 | if (NILP (ok_if_already_exists) |
| 2398 | || INTEGERP (ok_if_already_exists)) |
| 2399 | barf_or_query_if_file_exists (linkname, "make it a link", |
| 2400 | INTEGERP (ok_if_already_exists), 0, 0); |
| 2401 | if (0 > symlink (SSDATA (encoded_filename), |
| 2402 | SSDATA (encoded_linkname))) |
| 2403 | { |
| 2404 | /* If we didn't complain already, silently delete existing file. */ |
| 2405 | if (errno == EEXIST) |
| 2406 | { |
| 2407 | unlink (SSDATA (encoded_linkname)); |
| 2408 | if (0 <= symlink (SSDATA (encoded_filename), |
| 2409 | SSDATA (encoded_linkname))) |
| 2410 | { |
| 2411 | UNGCPRO; |
| 2412 | return Qnil; |
| 2413 | } |
| 2414 | } |
| 2415 | if (errno == ENOSYS) |
| 2416 | { |
| 2417 | UNGCPRO; |
| 2418 | xsignal1 (Qfile_error, |
| 2419 | build_string ("Symbolic links are not supported")); |
| 2420 | } |
| 2421 | |
| 2422 | report_file_error ("Making symbolic link", list2 (filename, linkname)); |
| 2423 | } |
| 2424 | UNGCPRO; |
| 2425 | return Qnil; |
| 2426 | } |
| 2427 | |
| 2428 | \f |
| 2429 | DEFUN ("file-name-absolute-p", Ffile_name_absolute_p, Sfile_name_absolute_p, |
| 2430 | 1, 1, 0, |
| 2431 | doc: /* Return t if file FILENAME specifies an absolute file name. |
| 2432 | On Unix, this is a name starting with a `/' or a `~'. */) |
| 2433 | (Lisp_Object filename) |
| 2434 | { |
| 2435 | CHECK_STRING (filename); |
| 2436 | return file_name_absolute_p (SSDATA (filename)) ? Qt : Qnil; |
| 2437 | } |
| 2438 | \f |
| 2439 | /* Return nonzero if file FILENAME exists and can be executed. */ |
| 2440 | |
| 2441 | static int |
| 2442 | check_executable (char *filename) |
| 2443 | { |
| 2444 | #ifdef DOS_NT |
| 2445 | struct stat st; |
| 2446 | if (stat (filename, &st) < 0) |
| 2447 | return 0; |
| 2448 | return ((st.st_mode & S_IEXEC) != 0); |
| 2449 | #else /* not DOS_NT */ |
| 2450 | #ifdef HAVE_EUIDACCESS |
| 2451 | return (euidaccess (filename, 1) >= 0); |
| 2452 | #else |
| 2453 | /* Access isn't quite right because it uses the real uid |
| 2454 | and we really want to test with the effective uid. |
| 2455 | But Unix doesn't give us a right way to do it. */ |
| 2456 | return (access (filename, 1) >= 0); |
| 2457 | #endif |
| 2458 | #endif /* not DOS_NT */ |
| 2459 | } |
| 2460 | |
| 2461 | /* Return nonzero if file FILENAME exists and can be written. */ |
| 2462 | |
| 2463 | static int |
| 2464 | check_writable (const char *filename) |
| 2465 | { |
| 2466 | #ifdef MSDOS |
| 2467 | struct stat st; |
| 2468 | if (stat (filename, &st) < 0) |
| 2469 | return 0; |
| 2470 | return (st.st_mode & S_IWRITE || S_ISDIR (st.st_mode)); |
| 2471 | #else /* not MSDOS */ |
| 2472 | #ifdef HAVE_EUIDACCESS |
| 2473 | int res = (euidaccess (filename, 2) >= 0); |
| 2474 | #ifdef CYGWIN |
| 2475 | /* euidaccess may have returned failure because Cygwin couldn't |
| 2476 | determine the file's UID or GID; if so, we return success. */ |
| 2477 | if (!res) |
| 2478 | { |
| 2479 | struct stat st; |
| 2480 | if (stat (filename, &st) < 0) |
| 2481 | return 0; |
| 2482 | res = (st.st_uid == -1 || st.st_gid == -1); |
| 2483 | } |
| 2484 | #endif /* CYGWIN */ |
| 2485 | return res; |
| 2486 | #else /* not HAVE_EUIDACCESS */ |
| 2487 | /* Access isn't quite right because it uses the real uid |
| 2488 | and we really want to test with the effective uid. |
| 2489 | But Unix doesn't give us a right way to do it. |
| 2490 | Opening with O_WRONLY could work for an ordinary file, |
| 2491 | but would lose for directories. */ |
| 2492 | return (access (filename, 2) >= 0); |
| 2493 | #endif /* not HAVE_EUIDACCESS */ |
| 2494 | #endif /* not MSDOS */ |
| 2495 | } |
| 2496 | |
| 2497 | DEFUN ("file-exists-p", Ffile_exists_p, Sfile_exists_p, 1, 1, 0, |
| 2498 | doc: /* Return t if file FILENAME exists (whether or not you can read it.) |
| 2499 | See also `file-readable-p' and `file-attributes'. |
| 2500 | This returns nil for a symlink to a nonexistent file. |
| 2501 | Use `file-symlink-p' to test for such links. */) |
| 2502 | (Lisp_Object filename) |
| 2503 | { |
| 2504 | Lisp_Object absname; |
| 2505 | Lisp_Object handler; |
| 2506 | struct stat statbuf; |
| 2507 | |
| 2508 | CHECK_STRING (filename); |
| 2509 | absname = Fexpand_file_name (filename, Qnil); |
| 2510 | |
| 2511 | /* If the file name has special constructs in it, |
| 2512 | call the corresponding file handler. */ |
| 2513 | handler = Ffind_file_name_handler (absname, Qfile_exists_p); |
| 2514 | if (!NILP (handler)) |
| 2515 | return call2 (handler, Qfile_exists_p, absname); |
| 2516 | |
| 2517 | absname = ENCODE_FILE (absname); |
| 2518 | |
| 2519 | return (stat (SSDATA (absname), &statbuf) >= 0) ? Qt : Qnil; |
| 2520 | } |
| 2521 | |
| 2522 | DEFUN ("file-executable-p", Ffile_executable_p, Sfile_executable_p, 1, 1, 0, |
| 2523 | doc: /* Return t if FILENAME can be executed by you. |
| 2524 | For a directory, this means you can access files in that directory. */) |
| 2525 | (Lisp_Object filename) |
| 2526 | { |
| 2527 | Lisp_Object absname; |
| 2528 | Lisp_Object handler; |
| 2529 | |
| 2530 | CHECK_STRING (filename); |
| 2531 | absname = Fexpand_file_name (filename, Qnil); |
| 2532 | |
| 2533 | /* If the file name has special constructs in it, |
| 2534 | call the corresponding file handler. */ |
| 2535 | handler = Ffind_file_name_handler (absname, Qfile_executable_p); |
| 2536 | if (!NILP (handler)) |
| 2537 | return call2 (handler, Qfile_executable_p, absname); |
| 2538 | |
| 2539 | absname = ENCODE_FILE (absname); |
| 2540 | |
| 2541 | return (check_executable (SSDATA (absname)) ? Qt : Qnil); |
| 2542 | } |
| 2543 | |
| 2544 | DEFUN ("file-readable-p", Ffile_readable_p, Sfile_readable_p, 1, 1, 0, |
| 2545 | doc: /* Return t if file FILENAME exists and you can read it. |
| 2546 | See also `file-exists-p' and `file-attributes'. */) |
| 2547 | (Lisp_Object filename) |
| 2548 | { |
| 2549 | Lisp_Object absname; |
| 2550 | Lisp_Object handler; |
| 2551 | int desc; |
| 2552 | int flags; |
| 2553 | struct stat statbuf; |
| 2554 | |
| 2555 | CHECK_STRING (filename); |
| 2556 | absname = Fexpand_file_name (filename, Qnil); |
| 2557 | |
| 2558 | /* If the file name has special constructs in it, |
| 2559 | call the corresponding file handler. */ |
| 2560 | handler = Ffind_file_name_handler (absname, Qfile_readable_p); |
| 2561 | if (!NILP (handler)) |
| 2562 | return call2 (handler, Qfile_readable_p, absname); |
| 2563 | |
| 2564 | absname = ENCODE_FILE (absname); |
| 2565 | |
| 2566 | #if defined (DOS_NT) || defined (macintosh) |
| 2567 | /* Under MS-DOS, Windows, and Macintosh, open does not work for |
| 2568 | directories. */ |
| 2569 | if (access (SDATA (absname), 0) == 0) |
| 2570 | return Qt; |
| 2571 | return Qnil; |
| 2572 | #else /* not DOS_NT and not macintosh */ |
| 2573 | flags = O_RDONLY; |
| 2574 | #ifdef O_NONBLOCK |
| 2575 | /* Opening a fifo without O_NONBLOCK can wait. |
| 2576 | We don't want to wait. But we don't want to mess wth O_NONBLOCK |
| 2577 | except in the case of a fifo, on a system which handles it. */ |
| 2578 | desc = stat (SSDATA (absname), &statbuf); |
| 2579 | if (desc < 0) |
| 2580 | return Qnil; |
| 2581 | if (S_ISFIFO (statbuf.st_mode)) |
| 2582 | flags |= O_NONBLOCK; |
| 2583 | #endif |
| 2584 | desc = emacs_open (SSDATA (absname), flags, 0); |
| 2585 | if (desc < 0) |
| 2586 | return Qnil; |
| 2587 | emacs_close (desc); |
| 2588 | return Qt; |
| 2589 | #endif /* not DOS_NT and not macintosh */ |
| 2590 | } |
| 2591 | |
| 2592 | /* Having this before file-symlink-p mysteriously caused it to be forgotten |
| 2593 | on the RT/PC. */ |
| 2594 | DEFUN ("file-writable-p", Ffile_writable_p, Sfile_writable_p, 1, 1, 0, |
| 2595 | doc: /* Return t if file FILENAME can be written or created by you. */) |
| 2596 | (Lisp_Object filename) |
| 2597 | { |
| 2598 | Lisp_Object absname, dir, encoded; |
| 2599 | Lisp_Object handler; |
| 2600 | struct stat statbuf; |
| 2601 | |
| 2602 | CHECK_STRING (filename); |
| 2603 | absname = Fexpand_file_name (filename, Qnil); |
| 2604 | |
| 2605 | /* If the file name has special constructs in it, |
| 2606 | call the corresponding file handler. */ |
| 2607 | handler = Ffind_file_name_handler (absname, Qfile_writable_p); |
| 2608 | if (!NILP (handler)) |
| 2609 | return call2 (handler, Qfile_writable_p, absname); |
| 2610 | |
| 2611 | encoded = ENCODE_FILE (absname); |
| 2612 | if (stat (SSDATA (encoded), &statbuf) >= 0) |
| 2613 | return (check_writable (SSDATA (encoded)) |
| 2614 | ? Qt : Qnil); |
| 2615 | |
| 2616 | dir = Ffile_name_directory (absname); |
| 2617 | #ifdef MSDOS |
| 2618 | if (!NILP (dir)) |
| 2619 | dir = Fdirectory_file_name (dir); |
| 2620 | #endif /* MSDOS */ |
| 2621 | |
| 2622 | dir = ENCODE_FILE (dir); |
| 2623 | #ifdef WINDOWSNT |
| 2624 | /* The read-only attribute of the parent directory doesn't affect |
| 2625 | whether a file or directory can be created within it. Some day we |
| 2626 | should check ACLs though, which do affect this. */ |
| 2627 | if (stat (SDATA (dir), &statbuf) < 0) |
| 2628 | return Qnil; |
| 2629 | return S_ISDIR (statbuf.st_mode) ? Qt : Qnil; |
| 2630 | #else |
| 2631 | return (check_writable (!NILP (dir) ? SSDATA (dir) : "") |
| 2632 | ? Qt : Qnil); |
| 2633 | #endif |
| 2634 | } |
| 2635 | \f |
| 2636 | DEFUN ("access-file", Faccess_file, Saccess_file, 2, 2, 0, |
| 2637 | doc: /* Access file FILENAME, and get an error if that does not work. |
| 2638 | The second argument STRING is used in the error message. |
| 2639 | If there is no error, returns nil. */) |
| 2640 | (Lisp_Object filename, Lisp_Object string) |
| 2641 | { |
| 2642 | Lisp_Object handler, encoded_filename, absname; |
| 2643 | int fd; |
| 2644 | |
| 2645 | CHECK_STRING (filename); |
| 2646 | absname = Fexpand_file_name (filename, Qnil); |
| 2647 | |
| 2648 | CHECK_STRING (string); |
| 2649 | |
| 2650 | /* If the file name has special constructs in it, |
| 2651 | call the corresponding file handler. */ |
| 2652 | handler = Ffind_file_name_handler (absname, Qaccess_file); |
| 2653 | if (!NILP (handler)) |
| 2654 | return call3 (handler, Qaccess_file, absname, string); |
| 2655 | |
| 2656 | encoded_filename = ENCODE_FILE (absname); |
| 2657 | |
| 2658 | fd = emacs_open (SSDATA (encoded_filename), O_RDONLY, 0); |
| 2659 | if (fd < 0) |
| 2660 | report_file_error (SSDATA (string), Fcons (filename, Qnil)); |
| 2661 | emacs_close (fd); |
| 2662 | |
| 2663 | return Qnil; |
| 2664 | } |
| 2665 | \f |
| 2666 | DEFUN ("file-symlink-p", Ffile_symlink_p, Sfile_symlink_p, 1, 1, 0, |
| 2667 | doc: /* Return non-nil if file FILENAME is the name of a symbolic link. |
| 2668 | The value is the link target, as a string. |
| 2669 | Otherwise it returns nil. |
| 2670 | |
| 2671 | This function returns t when given the name of a symlink that |
| 2672 | points to a nonexistent file. */) |
| 2673 | (Lisp_Object filename) |
| 2674 | { |
| 2675 | Lisp_Object handler; |
| 2676 | char *buf; |
| 2677 | Lisp_Object val; |
| 2678 | char readlink_buf[READLINK_BUFSIZE]; |
| 2679 | |
| 2680 | CHECK_STRING (filename); |
| 2681 | filename = Fexpand_file_name (filename, Qnil); |
| 2682 | |
| 2683 | /* If the file name has special constructs in it, |
| 2684 | call the corresponding file handler. */ |
| 2685 | handler = Ffind_file_name_handler (filename, Qfile_symlink_p); |
| 2686 | if (!NILP (handler)) |
| 2687 | return call2 (handler, Qfile_symlink_p, filename); |
| 2688 | |
| 2689 | filename = ENCODE_FILE (filename); |
| 2690 | |
| 2691 | buf = emacs_readlink (SSDATA (filename), readlink_buf); |
| 2692 | if (! buf) |
| 2693 | return Qnil; |
| 2694 | |
| 2695 | val = build_string (buf); |
| 2696 | if (buf[0] == '/' && strchr (buf, ':')) |
| 2697 | val = concat2 (build_string ("/:"), val); |
| 2698 | if (buf != readlink_buf) |
| 2699 | xfree (buf); |
| 2700 | val = DECODE_FILE (val); |
| 2701 | return val; |
| 2702 | } |
| 2703 | |
| 2704 | DEFUN ("file-directory-p", Ffile_directory_p, Sfile_directory_p, 1, 1, 0, |
| 2705 | doc: /* Return t if FILENAME names an existing directory. |
| 2706 | Symbolic links to directories count as directories. |
| 2707 | See `file-symlink-p' to distinguish symlinks. */) |
| 2708 | (Lisp_Object filename) |
| 2709 | { |
| 2710 | register Lisp_Object absname; |
| 2711 | struct stat st; |
| 2712 | Lisp_Object handler; |
| 2713 | |
| 2714 | absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory)); |
| 2715 | |
| 2716 | /* If the file name has special constructs in it, |
| 2717 | call the corresponding file handler. */ |
| 2718 | handler = Ffind_file_name_handler (absname, Qfile_directory_p); |
| 2719 | if (!NILP (handler)) |
| 2720 | return call2 (handler, Qfile_directory_p, absname); |
| 2721 | |
| 2722 | absname = ENCODE_FILE (absname); |
| 2723 | |
| 2724 | if (stat (SSDATA (absname), &st) < 0) |
| 2725 | return Qnil; |
| 2726 | return S_ISDIR (st.st_mode) ? Qt : Qnil; |
| 2727 | } |
| 2728 | |
| 2729 | DEFUN ("file-accessible-directory-p", Ffile_accessible_directory_p, |
| 2730 | Sfile_accessible_directory_p, 1, 1, 0, |
| 2731 | doc: /* Return t if file FILENAME names a directory you can open. |
| 2732 | For the value to be t, FILENAME must specify the name of a directory as a file, |
| 2733 | and the directory must allow you to open files in it. In order to use a |
| 2734 | directory as a buffer's current directory, this predicate must return true. |
| 2735 | A directory name spec may be given instead; then the value is t |
| 2736 | if the directory so specified exists and really is a readable and |
| 2737 | searchable directory. */) |
| 2738 | (Lisp_Object filename) |
| 2739 | { |
| 2740 | Lisp_Object handler; |
| 2741 | int tem; |
| 2742 | struct gcpro gcpro1; |
| 2743 | |
| 2744 | /* If the file name has special constructs in it, |
| 2745 | call the corresponding file handler. */ |
| 2746 | handler = Ffind_file_name_handler (filename, Qfile_accessible_directory_p); |
| 2747 | if (!NILP (handler)) |
| 2748 | return call2 (handler, Qfile_accessible_directory_p, filename); |
| 2749 | |
| 2750 | GCPRO1 (filename); |
| 2751 | tem = (NILP (Ffile_directory_p (filename)) |
| 2752 | || NILP (Ffile_executable_p (filename))); |
| 2753 | UNGCPRO; |
| 2754 | return tem ? Qnil : Qt; |
| 2755 | } |
| 2756 | |
| 2757 | DEFUN ("file-regular-p", Ffile_regular_p, Sfile_regular_p, 1, 1, 0, |
| 2758 | doc: /* Return t if FILENAME names a regular file. |
| 2759 | This is the sort of file that holds an ordinary stream of data bytes. |
| 2760 | Symbolic links to regular files count as regular files. |
| 2761 | See `file-symlink-p' to distinguish symlinks. */) |
| 2762 | (Lisp_Object filename) |
| 2763 | { |
| 2764 | register Lisp_Object absname; |
| 2765 | struct stat st; |
| 2766 | Lisp_Object handler; |
| 2767 | |
| 2768 | absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory)); |
| 2769 | |
| 2770 | /* If the file name has special constructs in it, |
| 2771 | call the corresponding file handler. */ |
| 2772 | handler = Ffind_file_name_handler (absname, Qfile_regular_p); |
| 2773 | if (!NILP (handler)) |
| 2774 | return call2 (handler, Qfile_regular_p, absname); |
| 2775 | |
| 2776 | absname = ENCODE_FILE (absname); |
| 2777 | |
| 2778 | #ifdef WINDOWSNT |
| 2779 | { |
| 2780 | int result; |
| 2781 | Lisp_Object tem = Vw32_get_true_file_attributes; |
| 2782 | |
| 2783 | /* Tell stat to use expensive method to get accurate info. */ |
| 2784 | Vw32_get_true_file_attributes = Qt; |
| 2785 | result = stat (SDATA (absname), &st); |
| 2786 | Vw32_get_true_file_attributes = tem; |
| 2787 | |
| 2788 | if (result < 0) |
| 2789 | return Qnil; |
| 2790 | return S_ISREG (st.st_mode) ? Qt : Qnil; |
| 2791 | } |
| 2792 | #else |
| 2793 | if (stat (SSDATA (absname), &st) < 0) |
| 2794 | return Qnil; |
| 2795 | return S_ISREG (st.st_mode) ? Qt : Qnil; |
| 2796 | #endif |
| 2797 | } |
| 2798 | \f |
| 2799 | DEFUN ("file-selinux-context", Ffile_selinux_context, |
| 2800 | Sfile_selinux_context, 1, 1, 0, |
| 2801 | doc: /* Return SELinux context of file named FILENAME. |
| 2802 | The return value is a list (USER ROLE TYPE RANGE), where the list |
| 2803 | elements are strings naming the user, role, type, and range of the |
| 2804 | file's SELinux security context. |
| 2805 | |
| 2806 | Return (nil nil nil nil) if the file is nonexistent or inaccessible, |
| 2807 | or if SELinux is disabled, or if Emacs lacks SELinux support. */) |
| 2808 | (Lisp_Object filename) |
| 2809 | { |
| 2810 | Lisp_Object absname; |
| 2811 | Lisp_Object values[4]; |
| 2812 | Lisp_Object handler; |
| 2813 | #if HAVE_LIBSELINUX |
| 2814 | security_context_t con; |
| 2815 | int conlength; |
| 2816 | context_t context; |
| 2817 | #endif |
| 2818 | |
| 2819 | absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory)); |
| 2820 | |
| 2821 | /* If the file name has special constructs in it, |
| 2822 | call the corresponding file handler. */ |
| 2823 | handler = Ffind_file_name_handler (absname, Qfile_selinux_context); |
| 2824 | if (!NILP (handler)) |
| 2825 | return call2 (handler, Qfile_selinux_context, absname); |
| 2826 | |
| 2827 | absname = ENCODE_FILE (absname); |
| 2828 | |
| 2829 | values[0] = Qnil; |
| 2830 | values[1] = Qnil; |
| 2831 | values[2] = Qnil; |
| 2832 | values[3] = Qnil; |
| 2833 | #if HAVE_LIBSELINUX |
| 2834 | if (is_selinux_enabled ()) |
| 2835 | { |
| 2836 | conlength = lgetfilecon (SSDATA (absname), &con); |
| 2837 | if (conlength > 0) |
| 2838 | { |
| 2839 | context = context_new (con); |
| 2840 | if (context_user_get (context)) |
| 2841 | values[0] = build_string (context_user_get (context)); |
| 2842 | if (context_role_get (context)) |
| 2843 | values[1] = build_string (context_role_get (context)); |
| 2844 | if (context_type_get (context)) |
| 2845 | values[2] = build_string (context_type_get (context)); |
| 2846 | if (context_range_get (context)) |
| 2847 | values[3] = build_string (context_range_get (context)); |
| 2848 | context_free (context); |
| 2849 | } |
| 2850 | if (con) |
| 2851 | freecon (con); |
| 2852 | } |
| 2853 | #endif |
| 2854 | |
| 2855 | return Flist (sizeof (values) / sizeof (values[0]), values); |
| 2856 | } |
| 2857 | \f |
| 2858 | DEFUN ("set-file-selinux-context", Fset_file_selinux_context, |
| 2859 | Sset_file_selinux_context, 2, 2, 0, |
| 2860 | doc: /* Set SELinux context of file named FILENAME to CONTEXT. |
| 2861 | CONTEXT should be a list (USER ROLE TYPE RANGE), where the list |
| 2862 | elements are strings naming the components of a SELinux context. |
| 2863 | |
| 2864 | This function does nothing if SELinux is disabled, or if Emacs was not |
| 2865 | compiled with SELinux support. */) |
| 2866 | (Lisp_Object filename, Lisp_Object context) |
| 2867 | { |
| 2868 | Lisp_Object absname; |
| 2869 | Lisp_Object handler; |
| 2870 | #if HAVE_LIBSELINUX |
| 2871 | Lisp_Object encoded_absname; |
| 2872 | Lisp_Object user = CAR_SAFE (context); |
| 2873 | Lisp_Object role = CAR_SAFE (CDR_SAFE (context)); |
| 2874 | Lisp_Object type = CAR_SAFE (CDR_SAFE (CDR_SAFE (context))); |
| 2875 | Lisp_Object range = CAR_SAFE (CDR_SAFE (CDR_SAFE (CDR_SAFE (context)))); |
| 2876 | security_context_t con; |
| 2877 | int fail, conlength; |
| 2878 | context_t parsed_con; |
| 2879 | #endif |
| 2880 | |
| 2881 | absname = Fexpand_file_name (filename, BVAR (current_buffer, directory)); |
| 2882 | |
| 2883 | /* If the file name has special constructs in it, |
| 2884 | call the corresponding file handler. */ |
| 2885 | handler = Ffind_file_name_handler (absname, Qset_file_selinux_context); |
| 2886 | if (!NILP (handler)) |
| 2887 | return call3 (handler, Qset_file_selinux_context, absname, context); |
| 2888 | |
| 2889 | #if HAVE_LIBSELINUX |
| 2890 | if (is_selinux_enabled ()) |
| 2891 | { |
| 2892 | /* Get current file context. */ |
| 2893 | encoded_absname = ENCODE_FILE (absname); |
| 2894 | conlength = lgetfilecon (SSDATA (encoded_absname), &con); |
| 2895 | if (conlength > 0) |
| 2896 | { |
| 2897 | parsed_con = context_new (con); |
| 2898 | /* Change the parts defined in the parameter.*/ |
| 2899 | if (STRINGP (user)) |
| 2900 | { |
| 2901 | if (context_user_set (parsed_con, SSDATA (user))) |
| 2902 | error ("Doing context_user_set"); |
| 2903 | } |
| 2904 | if (STRINGP (role)) |
| 2905 | { |
| 2906 | if (context_role_set (parsed_con, SSDATA (role))) |
| 2907 | error ("Doing context_role_set"); |
| 2908 | } |
| 2909 | if (STRINGP (type)) |
| 2910 | { |
| 2911 | if (context_type_set (parsed_con, SSDATA (type))) |
| 2912 | error ("Doing context_type_set"); |
| 2913 | } |
| 2914 | if (STRINGP (range)) |
| 2915 | { |
| 2916 | if (context_range_set (parsed_con, SSDATA (range))) |
| 2917 | error ("Doing context_range_set"); |
| 2918 | } |
| 2919 | |
| 2920 | /* Set the modified context back to the file. */ |
| 2921 | fail = lsetfilecon (SSDATA (encoded_absname), |
| 2922 | context_str (parsed_con)); |
| 2923 | /* See http://debbugs.gnu.org/11245 for ENOTSUP. */ |
| 2924 | if (fail && errno != ENOTSUP) |
| 2925 | report_file_error ("Doing lsetfilecon", Fcons (absname, Qnil)); |
| 2926 | |
| 2927 | context_free (parsed_con); |
| 2928 | } |
| 2929 | else |
| 2930 | report_file_error ("Doing lgetfilecon", Fcons (absname, Qnil)); |
| 2931 | |
| 2932 | if (con) |
| 2933 | freecon (con); |
| 2934 | } |
| 2935 | #endif |
| 2936 | |
| 2937 | return Qnil; |
| 2938 | } |
| 2939 | \f |
| 2940 | DEFUN ("file-modes", Ffile_modes, Sfile_modes, 1, 1, 0, |
| 2941 | doc: /* Return mode bits of file named FILENAME, as an integer. |
| 2942 | Return nil, if file does not exist or is not accessible. */) |
| 2943 | (Lisp_Object filename) |
| 2944 | { |
| 2945 | Lisp_Object absname; |
| 2946 | struct stat st; |
| 2947 | Lisp_Object handler; |
| 2948 | |
| 2949 | absname = expand_and_dir_to_file (filename, BVAR (current_buffer, directory)); |
| 2950 | |
| 2951 | /* If the file name has special constructs in it, |
| 2952 | call the corresponding file handler. */ |
| 2953 | handler = Ffind_file_name_handler (absname, Qfile_modes); |
| 2954 | if (!NILP (handler)) |
| 2955 | return call2 (handler, Qfile_modes, absname); |
| 2956 | |
| 2957 | absname = ENCODE_FILE (absname); |
| 2958 | |
| 2959 | if (stat (SSDATA (absname), &st) < 0) |
| 2960 | return Qnil; |
| 2961 | |
| 2962 | return make_number (st.st_mode & 07777); |
| 2963 | } |
| 2964 | |
| 2965 | DEFUN ("set-file-modes", Fset_file_modes, Sset_file_modes, 2, 2, |
| 2966 | "(let ((file (read-file-name \"File: \"))) \ |
| 2967 | (list file (read-file-modes nil file)))", |
| 2968 | doc: /* Set mode bits of file named FILENAME to MODE (an integer). |
| 2969 | Only the 12 low bits of MODE are used. |
| 2970 | |
| 2971 | Interactively, mode bits are read by `read-file-modes', which accepts |
| 2972 | symbolic notation, like the `chmod' command from GNU Coreutils. */) |
| 2973 | (Lisp_Object filename, Lisp_Object mode) |
| 2974 | { |
| 2975 | Lisp_Object absname, encoded_absname; |
| 2976 | Lisp_Object handler; |
| 2977 | |
| 2978 | absname = Fexpand_file_name (filename, BVAR (current_buffer, directory)); |
| 2979 | CHECK_NUMBER (mode); |
| 2980 | |
| 2981 | /* If the file name has special constructs in it, |
| 2982 | call the corresponding file handler. */ |
| 2983 | handler = Ffind_file_name_handler (absname, Qset_file_modes); |
| 2984 | if (!NILP (handler)) |
| 2985 | return call3 (handler, Qset_file_modes, absname, mode); |
| 2986 | |
| 2987 | encoded_absname = ENCODE_FILE (absname); |
| 2988 | |
| 2989 | if (chmod (SSDATA (encoded_absname), XINT (mode) & 07777) < 0) |
| 2990 | report_file_error ("Doing chmod", Fcons (absname, Qnil)); |
| 2991 | |
| 2992 | return Qnil; |
| 2993 | } |
| 2994 | |
| 2995 | DEFUN ("set-default-file-modes", Fset_default_file_modes, Sset_default_file_modes, 1, 1, 0, |
| 2996 | doc: /* Set the file permission bits for newly created files. |
| 2997 | The argument MODE should be an integer; only the low 9 bits are used. |
| 2998 | This setting is inherited by subprocesses. */) |
| 2999 | (Lisp_Object mode) |
| 3000 | { |
| 3001 | CHECK_NUMBER (mode); |
| 3002 | |
| 3003 | umask ((~ XINT (mode)) & 0777); |
| 3004 | |
| 3005 | return Qnil; |
| 3006 | } |
| 3007 | |
| 3008 | DEFUN ("default-file-modes", Fdefault_file_modes, Sdefault_file_modes, 0, 0, 0, |
| 3009 | doc: /* Return the default file protection for created files. |
| 3010 | The value is an integer. */) |
| 3011 | (void) |
| 3012 | { |
| 3013 | int realmask; |
| 3014 | Lisp_Object value; |
| 3015 | |
| 3016 | BLOCK_INPUT; |
| 3017 | realmask = umask (0); |
| 3018 | umask (realmask); |
| 3019 | UNBLOCK_INPUT; |
| 3020 | |
| 3021 | XSETINT (value, (~ realmask) & 0777); |
| 3022 | return value; |
| 3023 | } |
| 3024 | \f |
| 3025 | |
| 3026 | DEFUN ("set-file-times", Fset_file_times, Sset_file_times, 1, 2, 0, |
| 3027 | doc: /* Set times of file FILENAME to TIMESTAMP. |
| 3028 | Set both access and modification times. |
| 3029 | Return t on success, else nil. |
| 3030 | Use the current time if TIMESTAMP is nil. TIMESTAMP is in the format of |
| 3031 | `current-time'. */) |
| 3032 | (Lisp_Object filename, Lisp_Object timestamp) |
| 3033 | { |
| 3034 | Lisp_Object absname, encoded_absname; |
| 3035 | Lisp_Object handler; |
| 3036 | EMACS_TIME t = lisp_time_argument (timestamp); |
| 3037 | |
| 3038 | absname = Fexpand_file_name (filename, BVAR (current_buffer, directory)); |
| 3039 | |
| 3040 | /* If the file name has special constructs in it, |
| 3041 | call the corresponding file handler. */ |
| 3042 | handler = Ffind_file_name_handler (absname, Qset_file_times); |
| 3043 | if (!NILP (handler)) |
| 3044 | return call3 (handler, Qset_file_times, absname, timestamp); |
| 3045 | |
| 3046 | encoded_absname = ENCODE_FILE (absname); |
| 3047 | |
| 3048 | { |
| 3049 | if (set_file_times (-1, SSDATA (encoded_absname), t, t)) |
| 3050 | { |
| 3051 | #ifdef DOS_NT |
| 3052 | struct stat st; |
| 3053 | |
| 3054 | /* Setting times on a directory always fails. */ |
| 3055 | if (stat (SSDATA (encoded_absname), &st) == 0 && S_ISDIR (st.st_mode)) |
| 3056 | return Qnil; |
| 3057 | #endif |
| 3058 | report_file_error ("Setting file times", Fcons (absname, Qnil)); |
| 3059 | return Qnil; |
| 3060 | } |
| 3061 | } |
| 3062 | |
| 3063 | return Qt; |
| 3064 | } |
| 3065 | \f |
| 3066 | #ifdef HAVE_SYNC |
| 3067 | DEFUN ("unix-sync", Funix_sync, Sunix_sync, 0, 0, "", |
| 3068 | doc: /* Tell Unix to finish all pending disk updates. */) |
| 3069 | (void) |
| 3070 | { |
| 3071 | sync (); |
| 3072 | return Qnil; |
| 3073 | } |
| 3074 | |
| 3075 | #endif /* HAVE_SYNC */ |
| 3076 | |
| 3077 | DEFUN ("file-newer-than-file-p", Ffile_newer_than_file_p, Sfile_newer_than_file_p, 2, 2, 0, |
| 3078 | doc: /* Return t if file FILE1 is newer than file FILE2. |
| 3079 | If FILE1 does not exist, the answer is nil; |
| 3080 | otherwise, if FILE2 does not exist, the answer is t. */) |
| 3081 | (Lisp_Object file1, Lisp_Object file2) |
| 3082 | { |
| 3083 | Lisp_Object absname1, absname2; |
| 3084 | struct stat st1, st2; |
| 3085 | Lisp_Object handler; |
| 3086 | struct gcpro gcpro1, gcpro2; |
| 3087 | |
| 3088 | CHECK_STRING (file1); |
| 3089 | CHECK_STRING (file2); |
| 3090 | |
| 3091 | absname1 = Qnil; |
| 3092 | GCPRO2 (absname1, file2); |
| 3093 | absname1 = expand_and_dir_to_file (file1, BVAR (current_buffer, directory)); |
| 3094 | absname2 = expand_and_dir_to_file (file2, BVAR (current_buffer, directory)); |
| 3095 | UNGCPRO; |
| 3096 | |
| 3097 | /* If the file name has special constructs in it, |
| 3098 | call the corresponding file handler. */ |
| 3099 | handler = Ffind_file_name_handler (absname1, Qfile_newer_than_file_p); |
| 3100 | if (NILP (handler)) |
| 3101 | handler = Ffind_file_name_handler (absname2, Qfile_newer_than_file_p); |
| 3102 | if (!NILP (handler)) |
| 3103 | return call3 (handler, Qfile_newer_than_file_p, absname1, absname2); |
| 3104 | |
| 3105 | GCPRO2 (absname1, absname2); |
| 3106 | absname1 = ENCODE_FILE (absname1); |
| 3107 | absname2 = ENCODE_FILE (absname2); |
| 3108 | UNGCPRO; |
| 3109 | |
| 3110 | if (stat (SSDATA (absname1), &st1) < 0) |
| 3111 | return Qnil; |
| 3112 | |
| 3113 | if (stat (SSDATA (absname2), &st2) < 0) |
| 3114 | return Qt; |
| 3115 | |
| 3116 | return (EMACS_TIME_GT (get_stat_mtime (&st1), get_stat_mtime (&st2)) |
| 3117 | ? Qt : Qnil); |
| 3118 | } |
| 3119 | \f |
| 3120 | #ifndef READ_BUF_SIZE |
| 3121 | #define READ_BUF_SIZE (64 << 10) |
| 3122 | #endif |
| 3123 | /* Some buffer offsets are stored in 'int' variables. */ |
| 3124 | verify (READ_BUF_SIZE <= INT_MAX); |
| 3125 | |
| 3126 | /* This function is called after Lisp functions to decide a coding |
| 3127 | system are called, or when they cause an error. Before they are |
| 3128 | called, the current buffer is set unibyte and it contains only a |
| 3129 | newly inserted text (thus the buffer was empty before the |
| 3130 | insertion). |
| 3131 | |
| 3132 | The functions may set markers, overlays, text properties, or even |
| 3133 | alter the buffer contents, change the current buffer. |
| 3134 | |
| 3135 | Here, we reset all those changes by: |
| 3136 | o set back the current buffer. |
| 3137 | o move all markers and overlays to BEG. |
| 3138 | o remove all text properties. |
| 3139 | o set back the buffer multibyteness. */ |
| 3140 | |
| 3141 | static Lisp_Object |
| 3142 | decide_coding_unwind (Lisp_Object unwind_data) |
| 3143 | { |
| 3144 | Lisp_Object multibyte, undo_list, buffer; |
| 3145 | |
| 3146 | multibyte = XCAR (unwind_data); |
| 3147 | unwind_data = XCDR (unwind_data); |
| 3148 | undo_list = XCAR (unwind_data); |
| 3149 | buffer = XCDR (unwind_data); |
| 3150 | |
| 3151 | if (current_buffer != XBUFFER (buffer)) |
| 3152 | set_buffer_internal (XBUFFER (buffer)); |
| 3153 | adjust_markers_for_delete (BEG, BEG_BYTE, Z, Z_BYTE); |
| 3154 | adjust_overlays_for_delete (BEG, Z - BEG); |
| 3155 | BUF_INTERVALS (current_buffer) = 0; |
| 3156 | TEMP_SET_PT_BOTH (BEG, BEG_BYTE); |
| 3157 | |
| 3158 | /* Now we are safe to change the buffer's multibyteness directly. */ |
| 3159 | BVAR (current_buffer, enable_multibyte_characters) = multibyte; |
| 3160 | BVAR (current_buffer, undo_list) = undo_list; |
| 3161 | |
| 3162 | return Qnil; |
| 3163 | } |
| 3164 | |
| 3165 | |
| 3166 | /* Used to pass values from insert-file-contents to read_non_regular. */ |
| 3167 | |
| 3168 | static int non_regular_fd; |
| 3169 | static ptrdiff_t non_regular_inserted; |
| 3170 | static int non_regular_nbytes; |
| 3171 | |
| 3172 | |
| 3173 | /* Read from a non-regular file. |
| 3174 | Read non_regular_nbytes bytes max from non_regular_fd. |
| 3175 | Non_regular_inserted specifies where to put the read bytes. |
| 3176 | Value is the number of bytes read. */ |
| 3177 | |
| 3178 | static Lisp_Object |
| 3179 | read_non_regular (Lisp_Object ignore) |
| 3180 | { |
| 3181 | int nbytes; |
| 3182 | |
| 3183 | immediate_quit = 1; |
| 3184 | QUIT; |
| 3185 | nbytes = emacs_read (non_regular_fd, |
| 3186 | ((char *) BEG_ADDR + PT_BYTE - BEG_BYTE |
| 3187 | + non_regular_inserted), |
| 3188 | non_regular_nbytes); |
| 3189 | immediate_quit = 0; |
| 3190 | return make_number (nbytes); |
| 3191 | } |
| 3192 | |
| 3193 | |
| 3194 | /* Condition-case handler used when reading from non-regular files |
| 3195 | in insert-file-contents. */ |
| 3196 | |
| 3197 | static Lisp_Object |
| 3198 | read_non_regular_quit (Lisp_Object ignore) |
| 3199 | { |
| 3200 | return Qnil; |
| 3201 | } |
| 3202 | |
| 3203 | /* Reposition FD to OFFSET, based on WHENCE. This acts like lseek |
| 3204 | except that it also tests for OFFSET being out of lseek's range. */ |
| 3205 | static off_t |
| 3206 | emacs_lseek (int fd, EMACS_INT offset, int whence) |
| 3207 | { |
| 3208 | /* Use "&" rather than "&&" to suppress a bogus GCC warning; see |
| 3209 | <http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43772>. */ |
| 3210 | if (! ((TYPE_MINIMUM (off_t) <= offset) & (offset <= TYPE_MAXIMUM (off_t)))) |
| 3211 | { |
| 3212 | errno = EINVAL; |
| 3213 | return -1; |
| 3214 | } |
| 3215 | return lseek (fd, offset, whence); |
| 3216 | } |
| 3217 | |
| 3218 | /* Return a special time value indicating the error number ERRNUM. */ |
| 3219 | static EMACS_TIME |
| 3220 | time_error_value (int errnum) |
| 3221 | { |
| 3222 | EMACS_TIME t; |
| 3223 | int ns = (errnum == ENOENT || errnum == EACCES || errnum == ENOTDIR |
| 3224 | ? NONEXISTENT_MODTIME_NSECS |
| 3225 | : UNKNOWN_MODTIME_NSECS); |
| 3226 | EMACS_SET_SECS_NSECS (t, 0, ns); |
| 3227 | return t; |
| 3228 | } |
| 3229 | |
| 3230 | DEFUN ("insert-file-contents", Finsert_file_contents, Sinsert_file_contents, |
| 3231 | 1, 5, 0, |
| 3232 | doc: /* Insert contents of file FILENAME after point. |
| 3233 | Returns list of absolute file name and number of characters inserted. |
| 3234 | If second argument VISIT is non-nil, the buffer's visited filename and |
| 3235 | last save file modtime are set, and it is marked unmodified. If |
| 3236 | visiting and the file does not exist, visiting is completed before the |
| 3237 | error is signaled. |
| 3238 | |
| 3239 | The optional third and fourth arguments BEG and END specify what portion |
| 3240 | of the file to insert. These arguments count bytes in the file, not |
| 3241 | characters in the buffer. If VISIT is non-nil, BEG and END must be nil. |
| 3242 | |
| 3243 | If optional fifth argument REPLACE is non-nil, replace the current |
| 3244 | buffer contents (in the accessible portion) with the file contents. |
| 3245 | This is better than simply deleting and inserting the whole thing |
| 3246 | because (1) it preserves some marker positions and (2) it puts less data |
| 3247 | in the undo list. When REPLACE is non-nil, the second return value is |
| 3248 | the number of characters that replace previous buffer contents. |
| 3249 | |
| 3250 | This function does code conversion according to the value of |
| 3251 | `coding-system-for-read' or `file-coding-system-alist', and sets the |
| 3252 | variable `last-coding-system-used' to the coding system actually used. */) |
| 3253 | (Lisp_Object filename, Lisp_Object visit, Lisp_Object beg, Lisp_Object end, Lisp_Object replace) |
| 3254 | { |
| 3255 | struct stat st; |
| 3256 | int file_status; |
| 3257 | EMACS_TIME mtime; |
| 3258 | register int fd; |
| 3259 | ptrdiff_t inserted = 0; |
| 3260 | int nochange = 0; |
| 3261 | register ptrdiff_t how_much; |
| 3262 | off_t beg_offset, end_offset; |
| 3263 | register int unprocessed; |
| 3264 | ptrdiff_t count = SPECPDL_INDEX (); |
| 3265 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5; |
| 3266 | Lisp_Object handler, val, insval, orig_filename, old_undo; |
| 3267 | Lisp_Object p; |
| 3268 | ptrdiff_t total = 0; |
| 3269 | int not_regular = 0; |
| 3270 | int save_errno = 0; |
| 3271 | char read_buf[READ_BUF_SIZE]; |
| 3272 | struct coding_system coding; |
| 3273 | char buffer[1 << 14]; |
| 3274 | int replace_handled = 0; |
| 3275 | int set_coding_system = 0; |
| 3276 | Lisp_Object coding_system; |
| 3277 | int read_quit = 0; |
| 3278 | Lisp_Object old_Vdeactivate_mark = Vdeactivate_mark; |
| 3279 | int we_locked_file = 0; |
| 3280 | int deferred_remove_unwind_protect = 0; |
| 3281 | |
| 3282 | if (current_buffer->base_buffer && ! NILP (visit)) |
| 3283 | error ("Cannot do file visiting in an indirect buffer"); |
| 3284 | |
| 3285 | if (!NILP (BVAR (current_buffer, read_only))) |
| 3286 | Fbarf_if_buffer_read_only (); |
| 3287 | |
| 3288 | val = Qnil; |
| 3289 | p = Qnil; |
| 3290 | orig_filename = Qnil; |
| 3291 | old_undo = Qnil; |
| 3292 | |
| 3293 | GCPRO5 (filename, val, p, orig_filename, old_undo); |
| 3294 | |
| 3295 | CHECK_STRING (filename); |
| 3296 | filename = Fexpand_file_name (filename, Qnil); |
| 3297 | |
| 3298 | /* The value Qnil means that the coding system is not yet |
| 3299 | decided. */ |
| 3300 | coding_system = Qnil; |
| 3301 | |
| 3302 | /* If the file name has special constructs in it, |
| 3303 | call the corresponding file handler. */ |
| 3304 | handler = Ffind_file_name_handler (filename, Qinsert_file_contents); |
| 3305 | if (!NILP (handler)) |
| 3306 | { |
| 3307 | val = call6 (handler, Qinsert_file_contents, filename, |
| 3308 | visit, beg, end, replace); |
| 3309 | if (CONSP (val) && CONSP (XCDR (val)) |
| 3310 | && RANGED_INTEGERP (0, XCAR (XCDR (val)), ZV - PT)) |
| 3311 | inserted = XINT (XCAR (XCDR (val))); |
| 3312 | goto handled; |
| 3313 | } |
| 3314 | |
| 3315 | orig_filename = filename; |
| 3316 | filename = ENCODE_FILE (filename); |
| 3317 | |
| 3318 | fd = -1; |
| 3319 | |
| 3320 | #ifdef WINDOWSNT |
| 3321 | { |
| 3322 | Lisp_Object tem = Vw32_get_true_file_attributes; |
| 3323 | |
| 3324 | /* Tell stat to use expensive method to get accurate info. */ |
| 3325 | Vw32_get_true_file_attributes = Qt; |
| 3326 | file_status = stat (SSDATA (filename), &st); |
| 3327 | Vw32_get_true_file_attributes = tem; |
| 3328 | } |
| 3329 | #else |
| 3330 | file_status = stat (SSDATA (filename), &st); |
| 3331 | #endif /* WINDOWSNT */ |
| 3332 | |
| 3333 | if (file_status == 0) |
| 3334 | mtime = get_stat_mtime (&st); |
| 3335 | else |
| 3336 | { |
| 3337 | badopen: |
| 3338 | save_errno = errno; |
| 3339 | if (NILP (visit)) |
| 3340 | report_file_error ("Opening input file", Fcons (orig_filename, Qnil)); |
| 3341 | mtime = time_error_value (save_errno); |
| 3342 | st.st_size = -1; |
| 3343 | how_much = 0; |
| 3344 | if (!NILP (Vcoding_system_for_read)) |
| 3345 | Fset (Qbuffer_file_coding_system, Vcoding_system_for_read); |
| 3346 | goto notfound; |
| 3347 | } |
| 3348 | |
| 3349 | /* This code will need to be changed in order to work on named |
| 3350 | pipes, and it's probably just not worth it. So we should at |
| 3351 | least signal an error. */ |
| 3352 | if (!S_ISREG (st.st_mode)) |
| 3353 | { |
| 3354 | not_regular = 1; |
| 3355 | |
| 3356 | if (! NILP (visit)) |
| 3357 | goto notfound; |
| 3358 | |
| 3359 | if (! NILP (replace) || ! NILP (beg) || ! NILP (end)) |
| 3360 | xsignal2 (Qfile_error, |
| 3361 | build_string ("not a regular file"), orig_filename); |
| 3362 | } |
| 3363 | |
| 3364 | if (fd < 0) |
| 3365 | if ((fd = emacs_open (SSDATA (filename), O_RDONLY, 0)) < 0) |
| 3366 | goto badopen; |
| 3367 | |
| 3368 | /* Replacement should preserve point as it preserves markers. */ |
| 3369 | if (!NILP (replace)) |
| 3370 | record_unwind_protect (restore_point_unwind, Fpoint_marker ()); |
| 3371 | |
| 3372 | record_unwind_protect (close_file_unwind, make_number (fd)); |
| 3373 | |
| 3374 | |
| 3375 | if (!NILP (visit)) |
| 3376 | { |
| 3377 | if (!NILP (beg) || !NILP (end)) |
| 3378 | error ("Attempt to visit less than an entire file"); |
| 3379 | if (BEG < Z && NILP (replace)) |
| 3380 | error ("Cannot do file visiting in a non-empty buffer"); |
| 3381 | } |
| 3382 | |
| 3383 | if (!NILP (beg)) |
| 3384 | { |
| 3385 | if (! (RANGED_INTEGERP (0, beg, TYPE_MAXIMUM (off_t)))) |
| 3386 | wrong_type_argument (intern ("file-offset"), beg); |
| 3387 | beg_offset = XFASTINT (beg); |
| 3388 | } |
| 3389 | else |
| 3390 | beg_offset = 0; |
| 3391 | |
| 3392 | if (!NILP (end)) |
| 3393 | { |
| 3394 | if (! (RANGED_INTEGERP (0, end, TYPE_MAXIMUM (off_t)))) |
| 3395 | wrong_type_argument (intern ("file-offset"), end); |
| 3396 | end_offset = XFASTINT (end); |
| 3397 | } |
| 3398 | else |
| 3399 | { |
| 3400 | if (not_regular) |
| 3401 | end_offset = TYPE_MAXIMUM (off_t); |
| 3402 | else |
| 3403 | { |
| 3404 | end_offset = st.st_size; |
| 3405 | |
| 3406 | /* A negative size can happen on a platform that allows file |
| 3407 | sizes greater than the maximum off_t value. */ |
| 3408 | if (end_offset < 0) |
| 3409 | buffer_overflow (); |
| 3410 | |
| 3411 | /* The file size returned from stat may be zero, but data |
| 3412 | may be readable nonetheless, for example when this is a |
| 3413 | file in the /proc filesystem. */ |
| 3414 | if (end_offset == 0) |
| 3415 | end_offset = READ_BUF_SIZE; |
| 3416 | } |
| 3417 | } |
| 3418 | |
| 3419 | /* Check now whether the buffer will become too large, |
| 3420 | in the likely case where the file's length is not changing. |
| 3421 | This saves a lot of needless work before a buffer overflow. */ |
| 3422 | if (! not_regular) |
| 3423 | { |
| 3424 | /* The likely offset where we will stop reading. We could read |
| 3425 | more (or less), if the file grows (or shrinks) as we read it. */ |
| 3426 | off_t likely_end = min (end_offset, st.st_size); |
| 3427 | |
| 3428 | if (beg_offset < likely_end) |
| 3429 | { |
| 3430 | ptrdiff_t buf_bytes = |
| 3431 | Z_BYTE - (!NILP (replace) ? ZV_BYTE - BEGV_BYTE : 0); |
| 3432 | ptrdiff_t buf_growth_max = BUF_BYTES_MAX - buf_bytes; |
| 3433 | off_t likely_growth = likely_end - beg_offset; |
| 3434 | if (buf_growth_max < likely_growth) |
| 3435 | buffer_overflow (); |
| 3436 | } |
| 3437 | } |
| 3438 | |
| 3439 | /* Prevent redisplay optimizations. */ |
| 3440 | current_buffer->clip_changed = 1; |
| 3441 | |
| 3442 | if (EQ (Vcoding_system_for_read, Qauto_save_coding)) |
| 3443 | { |
| 3444 | coding_system = coding_inherit_eol_type (Qutf_8_emacs, Qunix); |
| 3445 | setup_coding_system (coding_system, &coding); |
| 3446 | /* Ensure we set Vlast_coding_system_used. */ |
| 3447 | set_coding_system = 1; |
| 3448 | } |
| 3449 | else if (BEG < Z) |
| 3450 | { |
| 3451 | /* Decide the coding system to use for reading the file now |
| 3452 | because we can't use an optimized method for handling |
| 3453 | `coding:' tag if the current buffer is not empty. */ |
| 3454 | if (!NILP (Vcoding_system_for_read)) |
| 3455 | coding_system = Vcoding_system_for_read; |
| 3456 | else |
| 3457 | { |
| 3458 | /* Don't try looking inside a file for a coding system |
| 3459 | specification if it is not seekable. */ |
| 3460 | if (! not_regular && ! NILP (Vset_auto_coding_function)) |
| 3461 | { |
| 3462 | /* Find a coding system specified in the heading two |
| 3463 | lines or in the tailing several lines of the file. |
| 3464 | We assume that the 1K-byte and 3K-byte for heading |
| 3465 | and tailing respectively are sufficient for this |
| 3466 | purpose. */ |
| 3467 | int nread; |
| 3468 | |
| 3469 | if (st.st_size <= (1024 * 4)) |
| 3470 | nread = emacs_read (fd, read_buf, 1024 * 4); |
| 3471 | else |
| 3472 | { |
| 3473 | nread = emacs_read (fd, read_buf, 1024); |
| 3474 | if (nread >= 0) |
| 3475 | { |
| 3476 | if (lseek (fd, st.st_size - (1024 * 3), SEEK_SET) < 0) |
| 3477 | report_file_error ("Setting file position", |
| 3478 | Fcons (orig_filename, Qnil)); |
| 3479 | nread += emacs_read (fd, read_buf + nread, 1024 * 3); |
| 3480 | } |
| 3481 | } |
| 3482 | |
| 3483 | if (nread < 0) |
| 3484 | error ("IO error reading %s: %s", |
| 3485 | SDATA (orig_filename), emacs_strerror (errno)); |
| 3486 | else if (nread > 0) |
| 3487 | { |
| 3488 | struct buffer *prev = current_buffer; |
| 3489 | Lisp_Object workbuf; |
| 3490 | struct buffer *buf; |
| 3491 | |
| 3492 | record_unwind_protect (Fset_buffer, Fcurrent_buffer ()); |
| 3493 | |
| 3494 | workbuf = Fget_buffer_create (build_string (" *code-converting-work*")); |
| 3495 | buf = XBUFFER (workbuf); |
| 3496 | |
| 3497 | delete_all_overlays (buf); |
| 3498 | BVAR (buf, directory) = BVAR (current_buffer, directory); |
| 3499 | BVAR (buf, read_only) = Qnil; |
| 3500 | BVAR (buf, filename) = Qnil; |
| 3501 | BVAR (buf, undo_list) = Qt; |
| 3502 | eassert (buf->overlays_before == NULL); |
| 3503 | eassert (buf->overlays_after == NULL); |
| 3504 | |
| 3505 | set_buffer_internal (buf); |
| 3506 | Ferase_buffer (); |
| 3507 | BVAR (buf, enable_multibyte_characters) = Qnil; |
| 3508 | |
| 3509 | insert_1_both ((char *) read_buf, nread, nread, 0, 0, 0); |
| 3510 | TEMP_SET_PT_BOTH (BEG, BEG_BYTE); |
| 3511 | coding_system = call2 (Vset_auto_coding_function, |
| 3512 | filename, make_number (nread)); |
| 3513 | set_buffer_internal (prev); |
| 3514 | |
| 3515 | /* Discard the unwind protect for recovering the |
| 3516 | current buffer. */ |
| 3517 | specpdl_ptr--; |
| 3518 | |
| 3519 | /* Rewind the file for the actual read done later. */ |
| 3520 | if (lseek (fd, 0, SEEK_SET) < 0) |
| 3521 | report_file_error ("Setting file position", |
| 3522 | Fcons (orig_filename, Qnil)); |
| 3523 | } |
| 3524 | } |
| 3525 | |
| 3526 | if (NILP (coding_system)) |
| 3527 | { |
| 3528 | /* If we have not yet decided a coding system, check |
| 3529 | file-coding-system-alist. */ |
| 3530 | Lisp_Object args[6]; |
| 3531 | |
| 3532 | args[0] = Qinsert_file_contents, args[1] = orig_filename; |
| 3533 | args[2] = visit, args[3] = beg, args[4] = end, args[5] = replace; |
| 3534 | coding_system = Ffind_operation_coding_system (6, args); |
| 3535 | if (CONSP (coding_system)) |
| 3536 | coding_system = XCAR (coding_system); |
| 3537 | } |
| 3538 | } |
| 3539 | |
| 3540 | if (NILP (coding_system)) |
| 3541 | coding_system = Qundecided; |
| 3542 | else |
| 3543 | CHECK_CODING_SYSTEM (coding_system); |
| 3544 | |
| 3545 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 3546 | /* We must suppress all character code conversion except for |
| 3547 | end-of-line conversion. */ |
| 3548 | coding_system = raw_text_coding_system (coding_system); |
| 3549 | |
| 3550 | setup_coding_system (coding_system, &coding); |
| 3551 | /* Ensure we set Vlast_coding_system_used. */ |
| 3552 | set_coding_system = 1; |
| 3553 | } |
| 3554 | |
| 3555 | /* If requested, replace the accessible part of the buffer |
| 3556 | with the file contents. Avoid replacing text at the |
| 3557 | beginning or end of the buffer that matches the file contents; |
| 3558 | that preserves markers pointing to the unchanged parts. |
| 3559 | |
| 3560 | Here we implement this feature in an optimized way |
| 3561 | for the case where code conversion is NOT needed. |
| 3562 | The following if-statement handles the case of conversion |
| 3563 | in a less optimal way. |
| 3564 | |
| 3565 | If the code conversion is "automatic" then we try using this |
| 3566 | method and hope for the best. |
| 3567 | But if we discover the need for conversion, we give up on this method |
| 3568 | and let the following if-statement handle the replace job. */ |
| 3569 | if (!NILP (replace) |
| 3570 | && BEGV < ZV |
| 3571 | && (NILP (coding_system) |
| 3572 | || ! CODING_REQUIRE_DECODING (&coding))) |
| 3573 | { |
| 3574 | /* same_at_start and same_at_end count bytes, |
| 3575 | because file access counts bytes |
| 3576 | and BEG and END count bytes. */ |
| 3577 | ptrdiff_t same_at_start = BEGV_BYTE; |
| 3578 | ptrdiff_t same_at_end = ZV_BYTE; |
| 3579 | ptrdiff_t overlap; |
| 3580 | /* There is still a possibility we will find the need to do code |
| 3581 | conversion. If that happens, we set this variable to 1 to |
| 3582 | give up on handling REPLACE in the optimized way. */ |
| 3583 | int giveup_match_end = 0; |
| 3584 | |
| 3585 | if (beg_offset != 0) |
| 3586 | { |
| 3587 | if (lseek (fd, beg_offset, SEEK_SET) < 0) |
| 3588 | report_file_error ("Setting file position", |
| 3589 | Fcons (orig_filename, Qnil)); |
| 3590 | } |
| 3591 | |
| 3592 | immediate_quit = 1; |
| 3593 | QUIT; |
| 3594 | /* Count how many chars at the start of the file |
| 3595 | match the text at the beginning of the buffer. */ |
| 3596 | while (1) |
| 3597 | { |
| 3598 | int nread, bufpos; |
| 3599 | |
| 3600 | nread = emacs_read (fd, buffer, sizeof buffer); |
| 3601 | if (nread < 0) |
| 3602 | error ("IO error reading %s: %s", |
| 3603 | SSDATA (orig_filename), emacs_strerror (errno)); |
| 3604 | else if (nread == 0) |
| 3605 | break; |
| 3606 | |
| 3607 | if (CODING_REQUIRE_DETECTION (&coding)) |
| 3608 | { |
| 3609 | coding_system = detect_coding_system ((unsigned char *) buffer, |
| 3610 | nread, nread, 1, 0, |
| 3611 | coding_system); |
| 3612 | setup_coding_system (coding_system, &coding); |
| 3613 | } |
| 3614 | |
| 3615 | if (CODING_REQUIRE_DECODING (&coding)) |
| 3616 | /* We found that the file should be decoded somehow. |
| 3617 | Let's give up here. */ |
| 3618 | { |
| 3619 | giveup_match_end = 1; |
| 3620 | break; |
| 3621 | } |
| 3622 | |
| 3623 | bufpos = 0; |
| 3624 | while (bufpos < nread && same_at_start < ZV_BYTE |
| 3625 | && FETCH_BYTE (same_at_start) == buffer[bufpos]) |
| 3626 | same_at_start++, bufpos++; |
| 3627 | /* If we found a discrepancy, stop the scan. |
| 3628 | Otherwise loop around and scan the next bufferful. */ |
| 3629 | if (bufpos != nread) |
| 3630 | break; |
| 3631 | } |
| 3632 | immediate_quit = 0; |
| 3633 | /* If the file matches the buffer completely, |
| 3634 | there's no need to replace anything. */ |
| 3635 | if (same_at_start - BEGV_BYTE == end_offset - beg_offset) |
| 3636 | { |
| 3637 | emacs_close (fd); |
| 3638 | specpdl_ptr--; |
| 3639 | /* Truncate the buffer to the size of the file. */ |
| 3640 | del_range_1 (same_at_start, same_at_end, 0, 0); |
| 3641 | goto handled; |
| 3642 | } |
| 3643 | immediate_quit = 1; |
| 3644 | QUIT; |
| 3645 | /* Count how many chars at the end of the file |
| 3646 | match the text at the end of the buffer. But, if we have |
| 3647 | already found that decoding is necessary, don't waste time. */ |
| 3648 | while (!giveup_match_end) |
| 3649 | { |
| 3650 | int total_read, nread, bufpos, trial; |
| 3651 | off_t curpos; |
| 3652 | |
| 3653 | /* At what file position are we now scanning? */ |
| 3654 | curpos = end_offset - (ZV_BYTE - same_at_end); |
| 3655 | /* If the entire file matches the buffer tail, stop the scan. */ |
| 3656 | if (curpos == 0) |
| 3657 | break; |
| 3658 | /* How much can we scan in the next step? */ |
| 3659 | trial = min (curpos, sizeof buffer); |
| 3660 | if (lseek (fd, curpos - trial, SEEK_SET) < 0) |
| 3661 | report_file_error ("Setting file position", |
| 3662 | Fcons (orig_filename, Qnil)); |
| 3663 | |
| 3664 | total_read = nread = 0; |
| 3665 | while (total_read < trial) |
| 3666 | { |
| 3667 | nread = emacs_read (fd, buffer + total_read, trial - total_read); |
| 3668 | if (nread < 0) |
| 3669 | error ("IO error reading %s: %s", |
| 3670 | SDATA (orig_filename), emacs_strerror (errno)); |
| 3671 | else if (nread == 0) |
| 3672 | break; |
| 3673 | total_read += nread; |
| 3674 | } |
| 3675 | |
| 3676 | /* Scan this bufferful from the end, comparing with |
| 3677 | the Emacs buffer. */ |
| 3678 | bufpos = total_read; |
| 3679 | |
| 3680 | /* Compare with same_at_start to avoid counting some buffer text |
| 3681 | as matching both at the file's beginning and at the end. */ |
| 3682 | while (bufpos > 0 && same_at_end > same_at_start |
| 3683 | && FETCH_BYTE (same_at_end - 1) == buffer[bufpos - 1]) |
| 3684 | same_at_end--, bufpos--; |
| 3685 | |
| 3686 | /* If we found a discrepancy, stop the scan. |
| 3687 | Otherwise loop around and scan the preceding bufferful. */ |
| 3688 | if (bufpos != 0) |
| 3689 | { |
| 3690 | /* If this discrepancy is because of code conversion, |
| 3691 | we cannot use this method; giveup and try the other. */ |
| 3692 | if (same_at_end > same_at_start |
| 3693 | && FETCH_BYTE (same_at_end - 1) >= 0200 |
| 3694 | && ! NILP (BVAR (current_buffer, enable_multibyte_characters)) |
| 3695 | && (CODING_MAY_REQUIRE_DECODING (&coding))) |
| 3696 | giveup_match_end = 1; |
| 3697 | break; |
| 3698 | } |
| 3699 | |
| 3700 | if (nread == 0) |
| 3701 | break; |
| 3702 | } |
| 3703 | immediate_quit = 0; |
| 3704 | |
| 3705 | if (! giveup_match_end) |
| 3706 | { |
| 3707 | ptrdiff_t temp; |
| 3708 | |
| 3709 | /* We win! We can handle REPLACE the optimized way. */ |
| 3710 | |
| 3711 | /* Extend the start of non-matching text area to multibyte |
| 3712 | character boundary. */ |
| 3713 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 3714 | while (same_at_start > BEGV_BYTE |
| 3715 | && ! CHAR_HEAD_P (FETCH_BYTE (same_at_start))) |
| 3716 | same_at_start--; |
| 3717 | |
| 3718 | /* Extend the end of non-matching text area to multibyte |
| 3719 | character boundary. */ |
| 3720 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 3721 | while (same_at_end < ZV_BYTE |
| 3722 | && ! CHAR_HEAD_P (FETCH_BYTE (same_at_end))) |
| 3723 | same_at_end++; |
| 3724 | |
| 3725 | /* Don't try to reuse the same piece of text twice. */ |
| 3726 | overlap = (same_at_start - BEGV_BYTE |
| 3727 | - (same_at_end |
| 3728 | + (! NILP (end) ? end_offset : st.st_size) - ZV_BYTE)); |
| 3729 | if (overlap > 0) |
| 3730 | same_at_end += overlap; |
| 3731 | |
| 3732 | /* Arrange to read only the nonmatching middle part of the file. */ |
| 3733 | beg_offset += same_at_start - BEGV_BYTE; |
| 3734 | end_offset -= ZV_BYTE - same_at_end; |
| 3735 | |
| 3736 | del_range_byte (same_at_start, same_at_end, 0); |
| 3737 | /* Insert from the file at the proper position. */ |
| 3738 | temp = BYTE_TO_CHAR (same_at_start); |
| 3739 | SET_PT_BOTH (temp, same_at_start); |
| 3740 | |
| 3741 | /* If display currently starts at beginning of line, |
| 3742 | keep it that way. */ |
| 3743 | if (XBUFFER (XWINDOW (selected_window)->buffer) == current_buffer) |
| 3744 | XWINDOW (selected_window)->start_at_line_beg = !NILP (Fbolp ()); |
| 3745 | |
| 3746 | replace_handled = 1; |
| 3747 | } |
| 3748 | } |
| 3749 | |
| 3750 | /* If requested, replace the accessible part of the buffer |
| 3751 | with the file contents. Avoid replacing text at the |
| 3752 | beginning or end of the buffer that matches the file contents; |
| 3753 | that preserves markers pointing to the unchanged parts. |
| 3754 | |
| 3755 | Here we implement this feature for the case where code conversion |
| 3756 | is needed, in a simple way that needs a lot of memory. |
| 3757 | The preceding if-statement handles the case of no conversion |
| 3758 | in a more optimized way. */ |
| 3759 | if (!NILP (replace) && ! replace_handled && BEGV < ZV) |
| 3760 | { |
| 3761 | ptrdiff_t same_at_start = BEGV_BYTE; |
| 3762 | ptrdiff_t same_at_end = ZV_BYTE; |
| 3763 | ptrdiff_t same_at_start_charpos; |
| 3764 | ptrdiff_t inserted_chars; |
| 3765 | ptrdiff_t overlap; |
| 3766 | ptrdiff_t bufpos; |
| 3767 | unsigned char *decoded; |
| 3768 | ptrdiff_t temp; |
| 3769 | ptrdiff_t this = 0; |
| 3770 | ptrdiff_t this_count = SPECPDL_INDEX (); |
| 3771 | int multibyte = ! NILP (BVAR (current_buffer, enable_multibyte_characters)); |
| 3772 | Lisp_Object conversion_buffer; |
| 3773 | struct gcpro gcpro1; |
| 3774 | |
| 3775 | conversion_buffer = code_conversion_save (1, multibyte); |
| 3776 | |
| 3777 | /* First read the whole file, performing code conversion into |
| 3778 | CONVERSION_BUFFER. */ |
| 3779 | |
| 3780 | if (lseek (fd, beg_offset, SEEK_SET) < 0) |
| 3781 | report_file_error ("Setting file position", |
| 3782 | Fcons (orig_filename, Qnil)); |
| 3783 | |
| 3784 | total = st.st_size; /* Total bytes in the file. */ |
| 3785 | how_much = 0; /* Bytes read from file so far. */ |
| 3786 | inserted = 0; /* Bytes put into CONVERSION_BUFFER so far. */ |
| 3787 | unprocessed = 0; /* Bytes not processed in previous loop. */ |
| 3788 | |
| 3789 | GCPRO1 (conversion_buffer); |
| 3790 | while (how_much < total) |
| 3791 | { |
| 3792 | /* We read one bunch by one (READ_BUF_SIZE bytes) to allow |
| 3793 | quitting while reading a huge while. */ |
| 3794 | /* `try'' is reserved in some compilers (Microsoft C). */ |
| 3795 | int trytry = min (total - how_much, READ_BUF_SIZE - unprocessed); |
| 3796 | |
| 3797 | /* Allow quitting out of the actual I/O. */ |
| 3798 | immediate_quit = 1; |
| 3799 | QUIT; |
| 3800 | this = emacs_read (fd, read_buf + unprocessed, trytry); |
| 3801 | immediate_quit = 0; |
| 3802 | |
| 3803 | if (this <= 0) |
| 3804 | break; |
| 3805 | |
| 3806 | how_much += this; |
| 3807 | |
| 3808 | BUF_TEMP_SET_PT (XBUFFER (conversion_buffer), |
| 3809 | BUF_Z (XBUFFER (conversion_buffer))); |
| 3810 | decode_coding_c_string (&coding, (unsigned char *) read_buf, |
| 3811 | unprocessed + this, conversion_buffer); |
| 3812 | unprocessed = coding.carryover_bytes; |
| 3813 | if (coding.carryover_bytes > 0) |
| 3814 | memcpy (read_buf, coding.carryover, unprocessed); |
| 3815 | } |
| 3816 | UNGCPRO; |
| 3817 | emacs_close (fd); |
| 3818 | |
| 3819 | /* We should remove the unwind_protect calling |
| 3820 | close_file_unwind, but other stuff has been added the stack, |
| 3821 | so defer the removal till we reach the `handled' label. */ |
| 3822 | deferred_remove_unwind_protect = 1; |
| 3823 | |
| 3824 | /* At this point, HOW_MUCH should equal TOTAL, or should be <= 0 |
| 3825 | if we couldn't read the file. */ |
| 3826 | |
| 3827 | if (this < 0) |
| 3828 | error ("IO error reading %s: %s", |
| 3829 | SDATA (orig_filename), emacs_strerror (errno)); |
| 3830 | |
| 3831 | if (unprocessed > 0) |
| 3832 | { |
| 3833 | coding.mode |= CODING_MODE_LAST_BLOCK; |
| 3834 | decode_coding_c_string (&coding, (unsigned char *) read_buf, |
| 3835 | unprocessed, conversion_buffer); |
| 3836 | coding.mode &= ~CODING_MODE_LAST_BLOCK; |
| 3837 | } |
| 3838 | |
| 3839 | coding_system = CODING_ID_NAME (coding.id); |
| 3840 | set_coding_system = 1; |
| 3841 | decoded = BUF_BEG_ADDR (XBUFFER (conversion_buffer)); |
| 3842 | inserted = (BUF_Z_BYTE (XBUFFER (conversion_buffer)) |
| 3843 | - BUF_BEG_BYTE (XBUFFER (conversion_buffer))); |
| 3844 | |
| 3845 | /* Compare the beginning of the converted string with the buffer |
| 3846 | text. */ |
| 3847 | |
| 3848 | bufpos = 0; |
| 3849 | while (bufpos < inserted && same_at_start < same_at_end |
| 3850 | && FETCH_BYTE (same_at_start) == decoded[bufpos]) |
| 3851 | same_at_start++, bufpos++; |
| 3852 | |
| 3853 | /* If the file matches the head of buffer completely, |
| 3854 | there's no need to replace anything. */ |
| 3855 | |
| 3856 | if (bufpos == inserted) |
| 3857 | { |
| 3858 | /* Truncate the buffer to the size of the file. */ |
| 3859 | if (same_at_start == same_at_end) |
| 3860 | nochange = 1; |
| 3861 | else |
| 3862 | del_range_byte (same_at_start, same_at_end, 0); |
| 3863 | inserted = 0; |
| 3864 | |
| 3865 | unbind_to (this_count, Qnil); |
| 3866 | goto handled; |
| 3867 | } |
| 3868 | |
| 3869 | /* Extend the start of non-matching text area to the previous |
| 3870 | multibyte character boundary. */ |
| 3871 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 3872 | while (same_at_start > BEGV_BYTE |
| 3873 | && ! CHAR_HEAD_P (FETCH_BYTE (same_at_start))) |
| 3874 | same_at_start--; |
| 3875 | |
| 3876 | /* Scan this bufferful from the end, comparing with |
| 3877 | the Emacs buffer. */ |
| 3878 | bufpos = inserted; |
| 3879 | |
| 3880 | /* Compare with same_at_start to avoid counting some buffer text |
| 3881 | as matching both at the file's beginning and at the end. */ |
| 3882 | while (bufpos > 0 && same_at_end > same_at_start |
| 3883 | && FETCH_BYTE (same_at_end - 1) == decoded[bufpos - 1]) |
| 3884 | same_at_end--, bufpos--; |
| 3885 | |
| 3886 | /* Extend the end of non-matching text area to the next |
| 3887 | multibyte character boundary. */ |
| 3888 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 3889 | while (same_at_end < ZV_BYTE |
| 3890 | && ! CHAR_HEAD_P (FETCH_BYTE (same_at_end))) |
| 3891 | same_at_end++; |
| 3892 | |
| 3893 | /* Don't try to reuse the same piece of text twice. */ |
| 3894 | overlap = same_at_start - BEGV_BYTE - (same_at_end + inserted - ZV_BYTE); |
| 3895 | if (overlap > 0) |
| 3896 | same_at_end += overlap; |
| 3897 | |
| 3898 | /* If display currently starts at beginning of line, |
| 3899 | keep it that way. */ |
| 3900 | if (XBUFFER (XWINDOW (selected_window)->buffer) == current_buffer) |
| 3901 | XWINDOW (selected_window)->start_at_line_beg = !NILP (Fbolp ()); |
| 3902 | |
| 3903 | /* Replace the chars that we need to replace, |
| 3904 | and update INSERTED to equal the number of bytes |
| 3905 | we are taking from the decoded string. */ |
| 3906 | inserted -= (ZV_BYTE - same_at_end) + (same_at_start - BEGV_BYTE); |
| 3907 | |
| 3908 | if (same_at_end != same_at_start) |
| 3909 | { |
| 3910 | del_range_byte (same_at_start, same_at_end, 0); |
| 3911 | temp = GPT; |
| 3912 | same_at_start = GPT_BYTE; |
| 3913 | } |
| 3914 | else |
| 3915 | { |
| 3916 | temp = BYTE_TO_CHAR (same_at_start); |
| 3917 | } |
| 3918 | /* Insert from the file at the proper position. */ |
| 3919 | SET_PT_BOTH (temp, same_at_start); |
| 3920 | same_at_start_charpos |
| 3921 | = buf_bytepos_to_charpos (XBUFFER (conversion_buffer), |
| 3922 | same_at_start - BEGV_BYTE |
| 3923 | + BUF_BEG_BYTE (XBUFFER (conversion_buffer))); |
| 3924 | inserted_chars |
| 3925 | = (buf_bytepos_to_charpos (XBUFFER (conversion_buffer), |
| 3926 | same_at_start + inserted - BEGV_BYTE |
| 3927 | + BUF_BEG_BYTE (XBUFFER (conversion_buffer))) |
| 3928 | - same_at_start_charpos); |
| 3929 | /* This binding is to avoid ask-user-about-supersession-threat |
| 3930 | being called in insert_from_buffer (via in |
| 3931 | prepare_to_modify_buffer). */ |
| 3932 | specbind (intern ("buffer-file-name"), Qnil); |
| 3933 | insert_from_buffer (XBUFFER (conversion_buffer), |
| 3934 | same_at_start_charpos, inserted_chars, 0); |
| 3935 | /* Set `inserted' to the number of inserted characters. */ |
| 3936 | inserted = PT - temp; |
| 3937 | /* Set point before the inserted characters. */ |
| 3938 | SET_PT_BOTH (temp, same_at_start); |
| 3939 | |
| 3940 | unbind_to (this_count, Qnil); |
| 3941 | |
| 3942 | goto handled; |
| 3943 | } |
| 3944 | |
| 3945 | if (! not_regular) |
| 3946 | total = end_offset - beg_offset; |
| 3947 | else |
| 3948 | /* For a special file, all we can do is guess. */ |
| 3949 | total = READ_BUF_SIZE; |
| 3950 | |
| 3951 | if (NILP (visit) && total > 0) |
| 3952 | { |
| 3953 | #ifdef CLASH_DETECTION |
| 3954 | if (!NILP (BVAR (current_buffer, file_truename)) |
| 3955 | /* Make binding buffer-file-name to nil effective. */ |
| 3956 | && !NILP (BVAR (current_buffer, filename)) |
| 3957 | && SAVE_MODIFF >= MODIFF) |
| 3958 | we_locked_file = 1; |
| 3959 | #endif /* CLASH_DETECTION */ |
| 3960 | prepare_to_modify_buffer (GPT, GPT, NULL); |
| 3961 | } |
| 3962 | |
| 3963 | move_gap (PT); |
| 3964 | if (GAP_SIZE < total) |
| 3965 | make_gap (total - GAP_SIZE); |
| 3966 | |
| 3967 | if (beg_offset != 0 || !NILP (replace)) |
| 3968 | { |
| 3969 | if (lseek (fd, beg_offset, SEEK_SET) < 0) |
| 3970 | report_file_error ("Setting file position", |
| 3971 | Fcons (orig_filename, Qnil)); |
| 3972 | } |
| 3973 | |
| 3974 | /* In the following loop, HOW_MUCH contains the total bytes read so |
| 3975 | far for a regular file, and not changed for a special file. But, |
| 3976 | before exiting the loop, it is set to a negative value if I/O |
| 3977 | error occurs. */ |
| 3978 | how_much = 0; |
| 3979 | |
| 3980 | /* Total bytes inserted. */ |
| 3981 | inserted = 0; |
| 3982 | |
| 3983 | /* Here, we don't do code conversion in the loop. It is done by |
| 3984 | decode_coding_gap after all data are read into the buffer. */ |
| 3985 | { |
| 3986 | ptrdiff_t gap_size = GAP_SIZE; |
| 3987 | |
| 3988 | while (how_much < total) |
| 3989 | { |
| 3990 | /* try is reserved in some compilers (Microsoft C) */ |
| 3991 | int trytry = min (total - how_much, READ_BUF_SIZE); |
| 3992 | ptrdiff_t this; |
| 3993 | |
| 3994 | if (not_regular) |
| 3995 | { |
| 3996 | Lisp_Object nbytes; |
| 3997 | |
| 3998 | /* Maybe make more room. */ |
| 3999 | if (gap_size < trytry) |
| 4000 | { |
| 4001 | make_gap (total - gap_size); |
| 4002 | gap_size = GAP_SIZE; |
| 4003 | } |
| 4004 | |
| 4005 | /* Read from the file, capturing `quit'. When an |
| 4006 | error occurs, end the loop, and arrange for a quit |
| 4007 | to be signaled after decoding the text we read. */ |
| 4008 | non_regular_fd = fd; |
| 4009 | non_regular_inserted = inserted; |
| 4010 | non_regular_nbytes = trytry; |
| 4011 | nbytes = internal_condition_case_1 (read_non_regular, |
| 4012 | Qnil, Qerror, |
| 4013 | read_non_regular_quit); |
| 4014 | if (NILP (nbytes)) |
| 4015 | { |
| 4016 | read_quit = 1; |
| 4017 | break; |
| 4018 | } |
| 4019 | |
| 4020 | this = XINT (nbytes); |
| 4021 | } |
| 4022 | else |
| 4023 | { |
| 4024 | /* Allow quitting out of the actual I/O. We don't make text |
| 4025 | part of the buffer until all the reading is done, so a C-g |
| 4026 | here doesn't do any harm. */ |
| 4027 | immediate_quit = 1; |
| 4028 | QUIT; |
| 4029 | this = emacs_read (fd, |
| 4030 | ((char *) BEG_ADDR + PT_BYTE - BEG_BYTE |
| 4031 | + inserted), |
| 4032 | trytry); |
| 4033 | immediate_quit = 0; |
| 4034 | } |
| 4035 | |
| 4036 | if (this <= 0) |
| 4037 | { |
| 4038 | how_much = this; |
| 4039 | break; |
| 4040 | } |
| 4041 | |
| 4042 | gap_size -= this; |
| 4043 | |
| 4044 | /* For a regular file, where TOTAL is the real size, |
| 4045 | count HOW_MUCH to compare with it. |
| 4046 | For a special file, where TOTAL is just a buffer size, |
| 4047 | so don't bother counting in HOW_MUCH. |
| 4048 | (INSERTED is where we count the number of characters inserted.) */ |
| 4049 | if (! not_regular) |
| 4050 | how_much += this; |
| 4051 | inserted += this; |
| 4052 | } |
| 4053 | } |
| 4054 | |
| 4055 | /* Now we have read all the file data into the gap. |
| 4056 | If it was empty, undo marking the buffer modified. */ |
| 4057 | |
| 4058 | if (inserted == 0) |
| 4059 | { |
| 4060 | #ifdef CLASH_DETECTION |
| 4061 | if (we_locked_file) |
| 4062 | unlock_file (BVAR (current_buffer, file_truename)); |
| 4063 | #endif |
| 4064 | Vdeactivate_mark = old_Vdeactivate_mark; |
| 4065 | } |
| 4066 | else |
| 4067 | Vdeactivate_mark = Qt; |
| 4068 | |
| 4069 | /* Make the text read part of the buffer. */ |
| 4070 | GAP_SIZE -= inserted; |
| 4071 | GPT += inserted; |
| 4072 | GPT_BYTE += inserted; |
| 4073 | ZV += inserted; |
| 4074 | ZV_BYTE += inserted; |
| 4075 | Z += inserted; |
| 4076 | Z_BYTE += inserted; |
| 4077 | |
| 4078 | if (GAP_SIZE > 0) |
| 4079 | /* Put an anchor to ensure multi-byte form ends at gap. */ |
| 4080 | *GPT_ADDR = 0; |
| 4081 | |
| 4082 | emacs_close (fd); |
| 4083 | |
| 4084 | /* Discard the unwind protect for closing the file. */ |
| 4085 | specpdl_ptr--; |
| 4086 | |
| 4087 | if (how_much < 0) |
| 4088 | error ("IO error reading %s: %s", |
| 4089 | SDATA (orig_filename), emacs_strerror (errno)); |
| 4090 | |
| 4091 | notfound: |
| 4092 | |
| 4093 | if (NILP (coding_system)) |
| 4094 | { |
| 4095 | /* The coding system is not yet decided. Decide it by an |
| 4096 | optimized method for handling `coding:' tag. |
| 4097 | |
| 4098 | Note that we can get here only if the buffer was empty |
| 4099 | before the insertion. */ |
| 4100 | |
| 4101 | if (!NILP (Vcoding_system_for_read)) |
| 4102 | coding_system = Vcoding_system_for_read; |
| 4103 | else |
| 4104 | { |
| 4105 | /* Since we are sure that the current buffer was empty |
| 4106 | before the insertion, we can toggle |
| 4107 | enable-multibyte-characters directly here without taking |
| 4108 | care of marker adjustment. By this way, we can run Lisp |
| 4109 | program safely before decoding the inserted text. */ |
| 4110 | Lisp_Object unwind_data; |
| 4111 | ptrdiff_t count1 = SPECPDL_INDEX (); |
| 4112 | |
| 4113 | unwind_data = Fcons (BVAR (current_buffer, enable_multibyte_characters), |
| 4114 | Fcons (BVAR (current_buffer, undo_list), |
| 4115 | Fcurrent_buffer ())); |
| 4116 | BVAR (current_buffer, enable_multibyte_characters) = Qnil; |
| 4117 | BVAR (current_buffer, undo_list) = Qt; |
| 4118 | record_unwind_protect (decide_coding_unwind, unwind_data); |
| 4119 | |
| 4120 | if (inserted > 0 && ! NILP (Vset_auto_coding_function)) |
| 4121 | { |
| 4122 | coding_system = call2 (Vset_auto_coding_function, |
| 4123 | filename, make_number (inserted)); |
| 4124 | } |
| 4125 | |
| 4126 | if (NILP (coding_system)) |
| 4127 | { |
| 4128 | /* If the coding system is not yet decided, check |
| 4129 | file-coding-system-alist. */ |
| 4130 | Lisp_Object args[6]; |
| 4131 | |
| 4132 | args[0] = Qinsert_file_contents, args[1] = orig_filename; |
| 4133 | args[2] = visit, args[3] = beg, args[4] = end, args[5] = Qnil; |
| 4134 | coding_system = Ffind_operation_coding_system (6, args); |
| 4135 | if (CONSP (coding_system)) |
| 4136 | coding_system = XCAR (coding_system); |
| 4137 | } |
| 4138 | unbind_to (count1, Qnil); |
| 4139 | inserted = Z_BYTE - BEG_BYTE; |
| 4140 | } |
| 4141 | |
| 4142 | if (NILP (coding_system)) |
| 4143 | coding_system = Qundecided; |
| 4144 | else |
| 4145 | CHECK_CODING_SYSTEM (coding_system); |
| 4146 | |
| 4147 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 4148 | /* We must suppress all character code conversion except for |
| 4149 | end-of-line conversion. */ |
| 4150 | coding_system = raw_text_coding_system (coding_system); |
| 4151 | setup_coding_system (coding_system, &coding); |
| 4152 | /* Ensure we set Vlast_coding_system_used. */ |
| 4153 | set_coding_system = 1; |
| 4154 | } |
| 4155 | |
| 4156 | if (!NILP (visit)) |
| 4157 | { |
| 4158 | /* When we visit a file by raw-text, we change the buffer to |
| 4159 | unibyte. */ |
| 4160 | if (CODING_FOR_UNIBYTE (&coding) |
| 4161 | /* Can't do this if part of the buffer might be preserved. */ |
| 4162 | && NILP (replace)) |
| 4163 | /* Visiting a file with these coding system makes the buffer |
| 4164 | unibyte. */ |
| 4165 | BVAR (current_buffer, enable_multibyte_characters) = Qnil; |
| 4166 | } |
| 4167 | |
| 4168 | coding.dst_multibyte = ! NILP (BVAR (current_buffer, enable_multibyte_characters)); |
| 4169 | if (CODING_MAY_REQUIRE_DECODING (&coding) |
| 4170 | && (inserted > 0 || CODING_REQUIRE_FLUSHING (&coding))) |
| 4171 | { |
| 4172 | move_gap_both (PT, PT_BYTE); |
| 4173 | GAP_SIZE += inserted; |
| 4174 | ZV_BYTE -= inserted; |
| 4175 | Z_BYTE -= inserted; |
| 4176 | ZV -= inserted; |
| 4177 | Z -= inserted; |
| 4178 | decode_coding_gap (&coding, inserted, inserted); |
| 4179 | inserted = coding.produced_char; |
| 4180 | coding_system = CODING_ID_NAME (coding.id); |
| 4181 | } |
| 4182 | else if (inserted > 0) |
| 4183 | adjust_after_insert (PT, PT_BYTE, PT + inserted, PT_BYTE + inserted, |
| 4184 | inserted); |
| 4185 | |
| 4186 | /* Call after-change hooks for the inserted text, aside from the case |
| 4187 | of normal visiting (not with REPLACE), which is done in a new buffer |
| 4188 | "before" the buffer is changed. */ |
| 4189 | if (inserted > 0 && total > 0 |
| 4190 | && (NILP (visit) || !NILP (replace))) |
| 4191 | { |
| 4192 | signal_after_change (PT, 0, inserted); |
| 4193 | update_compositions (PT, PT, CHECK_BORDER); |
| 4194 | } |
| 4195 | |
| 4196 | /* Now INSERTED is measured in characters. */ |
| 4197 | |
| 4198 | handled: |
| 4199 | |
| 4200 | if (deferred_remove_unwind_protect) |
| 4201 | /* If requested above, discard the unwind protect for closing the |
| 4202 | file. */ |
| 4203 | specpdl_ptr--; |
| 4204 | |
| 4205 | if (!NILP (visit)) |
| 4206 | { |
| 4207 | if (!EQ (BVAR (current_buffer, undo_list), Qt) && !nochange) |
| 4208 | BVAR (current_buffer, undo_list) = Qnil; |
| 4209 | |
| 4210 | if (NILP (handler)) |
| 4211 | { |
| 4212 | current_buffer->modtime = mtime; |
| 4213 | current_buffer->modtime_size = st.st_size; |
| 4214 | BVAR (current_buffer, filename) = orig_filename; |
| 4215 | } |
| 4216 | |
| 4217 | SAVE_MODIFF = MODIFF; |
| 4218 | BUF_AUTOSAVE_MODIFF (current_buffer) = MODIFF; |
| 4219 | XSETFASTINT (BVAR (current_buffer, save_length), Z - BEG); |
| 4220 | #ifdef CLASH_DETECTION |
| 4221 | if (NILP (handler)) |
| 4222 | { |
| 4223 | if (!NILP (BVAR (current_buffer, file_truename))) |
| 4224 | unlock_file (BVAR (current_buffer, file_truename)); |
| 4225 | unlock_file (filename); |
| 4226 | } |
| 4227 | #endif /* CLASH_DETECTION */ |
| 4228 | if (not_regular) |
| 4229 | xsignal2 (Qfile_error, |
| 4230 | build_string ("not a regular file"), orig_filename); |
| 4231 | } |
| 4232 | |
| 4233 | if (set_coding_system) |
| 4234 | Vlast_coding_system_used = coding_system; |
| 4235 | |
| 4236 | if (! NILP (Ffboundp (Qafter_insert_file_set_coding))) |
| 4237 | { |
| 4238 | insval = call2 (Qafter_insert_file_set_coding, make_number (inserted), |
| 4239 | visit); |
| 4240 | if (! NILP (insval)) |
| 4241 | { |
| 4242 | if (! RANGED_INTEGERP (0, insval, ZV - PT)) |
| 4243 | wrong_type_argument (intern ("inserted-chars"), insval); |
| 4244 | inserted = XFASTINT (insval); |
| 4245 | } |
| 4246 | } |
| 4247 | |
| 4248 | /* Decode file format. */ |
| 4249 | if (inserted > 0) |
| 4250 | { |
| 4251 | /* Don't run point motion or modification hooks when decoding. */ |
| 4252 | ptrdiff_t count1 = SPECPDL_INDEX (); |
| 4253 | ptrdiff_t old_inserted = inserted; |
| 4254 | specbind (Qinhibit_point_motion_hooks, Qt); |
| 4255 | specbind (Qinhibit_modification_hooks, Qt); |
| 4256 | |
| 4257 | /* Save old undo list and don't record undo for decoding. */ |
| 4258 | old_undo = BVAR (current_buffer, undo_list); |
| 4259 | BVAR (current_buffer, undo_list) = Qt; |
| 4260 | |
| 4261 | if (NILP (replace)) |
| 4262 | { |
| 4263 | insval = call3 (Qformat_decode, |
| 4264 | Qnil, make_number (inserted), visit); |
| 4265 | if (! RANGED_INTEGERP (0, insval, ZV - PT)) |
| 4266 | wrong_type_argument (intern ("inserted-chars"), insval); |
| 4267 | inserted = XFASTINT (insval); |
| 4268 | } |
| 4269 | else |
| 4270 | { |
| 4271 | /* If REPLACE is non-nil and we succeeded in not replacing the |
| 4272 | beginning or end of the buffer text with the file's contents, |
| 4273 | call format-decode with `point' positioned at the beginning |
| 4274 | of the buffer and `inserted' equaling the number of |
| 4275 | characters in the buffer. Otherwise, format-decode might |
| 4276 | fail to correctly analyze the beginning or end of the buffer. |
| 4277 | Hence we temporarily save `point' and `inserted' here and |
| 4278 | restore `point' iff format-decode did not insert or delete |
| 4279 | any text. Otherwise we leave `point' at point-min. */ |
| 4280 | ptrdiff_t opoint = PT; |
| 4281 | ptrdiff_t opoint_byte = PT_BYTE; |
| 4282 | ptrdiff_t oinserted = ZV - BEGV; |
| 4283 | EMACS_INT ochars_modiff = CHARS_MODIFF; |
| 4284 | |
| 4285 | TEMP_SET_PT_BOTH (BEGV, BEGV_BYTE); |
| 4286 | insval = call3 (Qformat_decode, |
| 4287 | Qnil, make_number (oinserted), visit); |
| 4288 | if (! RANGED_INTEGERP (0, insval, ZV - PT)) |
| 4289 | wrong_type_argument (intern ("inserted-chars"), insval); |
| 4290 | if (ochars_modiff == CHARS_MODIFF) |
| 4291 | /* format_decode didn't modify buffer's characters => move |
| 4292 | point back to position before inserted text and leave |
| 4293 | value of inserted alone. */ |
| 4294 | SET_PT_BOTH (opoint, opoint_byte); |
| 4295 | else |
| 4296 | /* format_decode modified buffer's characters => consider |
| 4297 | entire buffer changed and leave point at point-min. */ |
| 4298 | inserted = XFASTINT (insval); |
| 4299 | } |
| 4300 | |
| 4301 | /* For consistency with format-decode call these now iff inserted > 0 |
| 4302 | (martin 2007-06-28). */ |
| 4303 | p = Vafter_insert_file_functions; |
| 4304 | while (CONSP (p)) |
| 4305 | { |
| 4306 | if (NILP (replace)) |
| 4307 | { |
| 4308 | insval = call1 (XCAR (p), make_number (inserted)); |
| 4309 | if (!NILP (insval)) |
| 4310 | { |
| 4311 | if (! RANGED_INTEGERP (0, insval, ZV - PT)) |
| 4312 | wrong_type_argument (intern ("inserted-chars"), insval); |
| 4313 | inserted = XFASTINT (insval); |
| 4314 | } |
| 4315 | } |
| 4316 | else |
| 4317 | { |
| 4318 | /* For the rationale of this see the comment on |
| 4319 | format-decode above. */ |
| 4320 | ptrdiff_t opoint = PT; |
| 4321 | ptrdiff_t opoint_byte = PT_BYTE; |
| 4322 | ptrdiff_t oinserted = ZV - BEGV; |
| 4323 | EMACS_INT ochars_modiff = CHARS_MODIFF; |
| 4324 | |
| 4325 | TEMP_SET_PT_BOTH (BEGV, BEGV_BYTE); |
| 4326 | insval = call1 (XCAR (p), make_number (oinserted)); |
| 4327 | if (!NILP (insval)) |
| 4328 | { |
| 4329 | if (! RANGED_INTEGERP (0, insval, ZV - PT)) |
| 4330 | wrong_type_argument (intern ("inserted-chars"), insval); |
| 4331 | if (ochars_modiff == CHARS_MODIFF) |
| 4332 | /* after_insert_file_functions didn't modify |
| 4333 | buffer's characters => move point back to |
| 4334 | position before inserted text and leave value of |
| 4335 | inserted alone. */ |
| 4336 | SET_PT_BOTH (opoint, opoint_byte); |
| 4337 | else |
| 4338 | /* after_insert_file_functions did modify buffer's |
| 4339 | characters => consider entire buffer changed and |
| 4340 | leave point at point-min. */ |
| 4341 | inserted = XFASTINT (insval); |
| 4342 | } |
| 4343 | } |
| 4344 | |
| 4345 | QUIT; |
| 4346 | p = XCDR (p); |
| 4347 | } |
| 4348 | |
| 4349 | if (NILP (visit)) |
| 4350 | { |
| 4351 | BVAR (current_buffer, undo_list) = old_undo; |
| 4352 | if (CONSP (old_undo) && inserted != old_inserted) |
| 4353 | { |
| 4354 | /* Adjust the last undo record for the size change during |
| 4355 | the format conversion. */ |
| 4356 | Lisp_Object tem = XCAR (old_undo); |
| 4357 | if (CONSP (tem) && INTEGERP (XCAR (tem)) |
| 4358 | && INTEGERP (XCDR (tem)) |
| 4359 | && XFASTINT (XCDR (tem)) == PT + old_inserted) |
| 4360 | XSETCDR (tem, make_number (PT + inserted)); |
| 4361 | } |
| 4362 | } |
| 4363 | else |
| 4364 | /* If undo_list was Qt before, keep it that way. |
| 4365 | Otherwise start with an empty undo_list. */ |
| 4366 | BVAR (current_buffer, undo_list) = EQ (old_undo, Qt) ? Qt : Qnil; |
| 4367 | |
| 4368 | unbind_to (count1, Qnil); |
| 4369 | } |
| 4370 | |
| 4371 | if (!NILP (visit) |
| 4372 | && EMACS_NSECS (current_buffer->modtime) == NONEXISTENT_MODTIME_NSECS) |
| 4373 | { |
| 4374 | /* If visiting nonexistent file, return nil. */ |
| 4375 | errno = save_errno; |
| 4376 | report_file_error ("Opening input file", Fcons (orig_filename, Qnil)); |
| 4377 | } |
| 4378 | |
| 4379 | if (read_quit) |
| 4380 | Fsignal (Qquit, Qnil); |
| 4381 | |
| 4382 | /* ??? Retval needs to be dealt with in all cases consistently. */ |
| 4383 | if (NILP (val)) |
| 4384 | val = Fcons (orig_filename, |
| 4385 | Fcons (make_number (inserted), |
| 4386 | Qnil)); |
| 4387 | |
| 4388 | RETURN_UNGCPRO (unbind_to (count, val)); |
| 4389 | } |
| 4390 | \f |
| 4391 | static Lisp_Object build_annotations (Lisp_Object, Lisp_Object); |
| 4392 | |
| 4393 | static Lisp_Object |
| 4394 | build_annotations_unwind (Lisp_Object arg) |
| 4395 | { |
| 4396 | Vwrite_region_annotation_buffers = arg; |
| 4397 | return Qnil; |
| 4398 | } |
| 4399 | |
| 4400 | /* Decide the coding-system to encode the data with. */ |
| 4401 | |
| 4402 | static Lisp_Object |
| 4403 | choose_write_coding_system (Lisp_Object start, Lisp_Object end, Lisp_Object filename, |
| 4404 | Lisp_Object append, Lisp_Object visit, Lisp_Object lockname, |
| 4405 | struct coding_system *coding) |
| 4406 | { |
| 4407 | Lisp_Object val; |
| 4408 | Lisp_Object eol_parent = Qnil; |
| 4409 | |
| 4410 | if (auto_saving |
| 4411 | && NILP (Fstring_equal (BVAR (current_buffer, filename), |
| 4412 | BVAR (current_buffer, auto_save_file_name)))) |
| 4413 | { |
| 4414 | val = Qutf_8_emacs; |
| 4415 | eol_parent = Qunix; |
| 4416 | } |
| 4417 | else if (!NILP (Vcoding_system_for_write)) |
| 4418 | { |
| 4419 | val = Vcoding_system_for_write; |
| 4420 | if (coding_system_require_warning |
| 4421 | && !NILP (Ffboundp (Vselect_safe_coding_system_function))) |
| 4422 | /* Confirm that VAL can surely encode the current region. */ |
| 4423 | val = call5 (Vselect_safe_coding_system_function, |
| 4424 | start, end, Fcons (Qt, Fcons (val, Qnil)), |
| 4425 | Qnil, filename); |
| 4426 | } |
| 4427 | else |
| 4428 | { |
| 4429 | /* If the variable `buffer-file-coding-system' is set locally, |
| 4430 | it means that the file was read with some kind of code |
| 4431 | conversion or the variable is explicitly set by users. We |
| 4432 | had better write it out with the same coding system even if |
| 4433 | `enable-multibyte-characters' is nil. |
| 4434 | |
| 4435 | If it is not set locally, we anyway have to convert EOL |
| 4436 | format if the default value of `buffer-file-coding-system' |
| 4437 | tells that it is not Unix-like (LF only) format. */ |
| 4438 | int using_default_coding = 0; |
| 4439 | int force_raw_text = 0; |
| 4440 | |
| 4441 | val = BVAR (current_buffer, buffer_file_coding_system); |
| 4442 | if (NILP (val) |
| 4443 | || NILP (Flocal_variable_p (Qbuffer_file_coding_system, Qnil))) |
| 4444 | { |
| 4445 | val = Qnil; |
| 4446 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 4447 | force_raw_text = 1; |
| 4448 | } |
| 4449 | |
| 4450 | if (NILP (val)) |
| 4451 | { |
| 4452 | /* Check file-coding-system-alist. */ |
| 4453 | Lisp_Object args[7], coding_systems; |
| 4454 | |
| 4455 | args[0] = Qwrite_region; args[1] = start; args[2] = end; |
| 4456 | args[3] = filename; args[4] = append; args[5] = visit; |
| 4457 | args[6] = lockname; |
| 4458 | coding_systems = Ffind_operation_coding_system (7, args); |
| 4459 | if (CONSP (coding_systems) && !NILP (XCDR (coding_systems))) |
| 4460 | val = XCDR (coding_systems); |
| 4461 | } |
| 4462 | |
| 4463 | if (NILP (val)) |
| 4464 | { |
| 4465 | /* If we still have not decided a coding system, use the |
| 4466 | default value of buffer-file-coding-system. */ |
| 4467 | val = BVAR (current_buffer, buffer_file_coding_system); |
| 4468 | using_default_coding = 1; |
| 4469 | } |
| 4470 | |
| 4471 | if (! NILP (val) && ! force_raw_text) |
| 4472 | { |
| 4473 | Lisp_Object spec, attrs; |
| 4474 | |
| 4475 | CHECK_CODING_SYSTEM_GET_SPEC (val, spec); |
| 4476 | attrs = AREF (spec, 0); |
| 4477 | if (EQ (CODING_ATTR_TYPE (attrs), Qraw_text)) |
| 4478 | force_raw_text = 1; |
| 4479 | } |
| 4480 | |
| 4481 | if (!force_raw_text |
| 4482 | && !NILP (Ffboundp (Vselect_safe_coding_system_function))) |
| 4483 | /* Confirm that VAL can surely encode the current region. */ |
| 4484 | val = call5 (Vselect_safe_coding_system_function, |
| 4485 | start, end, val, Qnil, filename); |
| 4486 | |
| 4487 | /* If the decided coding-system doesn't specify end-of-line |
| 4488 | format, we use that of |
| 4489 | `default-buffer-file-coding-system'. */ |
| 4490 | if (! using_default_coding |
| 4491 | && ! NILP (BVAR (&buffer_defaults, buffer_file_coding_system))) |
| 4492 | val = (coding_inherit_eol_type |
| 4493 | (val, BVAR (&buffer_defaults, buffer_file_coding_system))); |
| 4494 | |
| 4495 | /* If we decide not to encode text, use `raw-text' or one of its |
| 4496 | subsidiaries. */ |
| 4497 | if (force_raw_text) |
| 4498 | val = raw_text_coding_system (val); |
| 4499 | } |
| 4500 | |
| 4501 | val = coding_inherit_eol_type (val, eol_parent); |
| 4502 | setup_coding_system (val, coding); |
| 4503 | |
| 4504 | if (!STRINGP (start) && !NILP (BVAR (current_buffer, selective_display))) |
| 4505 | coding->mode |= CODING_MODE_SELECTIVE_DISPLAY; |
| 4506 | return val; |
| 4507 | } |
| 4508 | |
| 4509 | DEFUN ("write-region", Fwrite_region, Swrite_region, 3, 7, |
| 4510 | "r\nFWrite region to file: \ni\ni\ni\np", |
| 4511 | doc: /* Write current region into specified file. |
| 4512 | When called from a program, requires three arguments: |
| 4513 | START, END and FILENAME. START and END are normally buffer positions |
| 4514 | specifying the part of the buffer to write. |
| 4515 | If START is nil, that means to use the entire buffer contents. |
| 4516 | If START is a string, then output that string to the file |
| 4517 | instead of any buffer contents; END is ignored. |
| 4518 | |
| 4519 | Optional fourth argument APPEND if non-nil means |
| 4520 | append to existing file contents (if any). If it is an integer, |
| 4521 | seek to that offset in the file before writing. |
| 4522 | Optional fifth argument VISIT, if t or a string, means |
| 4523 | set the last-save-file-modtime of buffer to this file's modtime |
| 4524 | and mark buffer not modified. |
| 4525 | If VISIT is a string, it is a second file name; |
| 4526 | the output goes to FILENAME, but the buffer is marked as visiting VISIT. |
| 4527 | VISIT is also the file name to lock and unlock for clash detection. |
| 4528 | If VISIT is neither t nor nil nor a string, |
| 4529 | that means do not display the \"Wrote file\" message. |
| 4530 | The optional sixth arg LOCKNAME, if non-nil, specifies the name to |
| 4531 | use for locking and unlocking, overriding FILENAME and VISIT. |
| 4532 | The optional seventh arg MUSTBENEW, if non-nil, insists on a check |
| 4533 | for an existing file with the same name. If MUSTBENEW is `excl', |
| 4534 | that means to get an error if the file already exists; never overwrite. |
| 4535 | If MUSTBENEW is neither nil nor `excl', that means ask for |
| 4536 | confirmation before overwriting, but do go ahead and overwrite the file |
| 4537 | if the user confirms. |
| 4538 | |
| 4539 | This does code conversion according to the value of |
| 4540 | `coding-system-for-write', `buffer-file-coding-system', or |
| 4541 | `file-coding-system-alist', and sets the variable |
| 4542 | `last-coding-system-used' to the coding system actually used. |
| 4543 | |
| 4544 | This calls `write-region-annotate-functions' at the start, and |
| 4545 | `write-region-post-annotation-function' at the end. */) |
| 4546 | (Lisp_Object start, Lisp_Object end, Lisp_Object filename, Lisp_Object append, Lisp_Object visit, Lisp_Object lockname, Lisp_Object mustbenew) |
| 4547 | { |
| 4548 | register int desc; |
| 4549 | int failure; |
| 4550 | int save_errno = 0; |
| 4551 | const char *fn; |
| 4552 | struct stat st; |
| 4553 | ptrdiff_t count = SPECPDL_INDEX (); |
| 4554 | int count1; |
| 4555 | Lisp_Object handler; |
| 4556 | Lisp_Object visit_file; |
| 4557 | Lisp_Object annotations; |
| 4558 | Lisp_Object encoded_filename; |
| 4559 | int visiting = (EQ (visit, Qt) || STRINGP (visit)); |
| 4560 | int quietly = !NILP (visit); |
| 4561 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4, gcpro5; |
| 4562 | struct buffer *given_buffer; |
| 4563 | struct coding_system coding; |
| 4564 | |
| 4565 | if (current_buffer->base_buffer && visiting) |
| 4566 | error ("Cannot do file visiting in an indirect buffer"); |
| 4567 | |
| 4568 | if (!NILP (start) && !STRINGP (start)) |
| 4569 | validate_region (&start, &end); |
| 4570 | |
| 4571 | visit_file = Qnil; |
| 4572 | GCPRO5 (start, filename, visit, visit_file, lockname); |
| 4573 | |
| 4574 | filename = Fexpand_file_name (filename, Qnil); |
| 4575 | |
| 4576 | if (!NILP (mustbenew) && !EQ (mustbenew, Qexcl)) |
| 4577 | barf_or_query_if_file_exists (filename, "overwrite", 1, 0, 1); |
| 4578 | |
| 4579 | if (STRINGP (visit)) |
| 4580 | visit_file = Fexpand_file_name (visit, Qnil); |
| 4581 | else |
| 4582 | visit_file = filename; |
| 4583 | |
| 4584 | if (NILP (lockname)) |
| 4585 | lockname = visit_file; |
| 4586 | |
| 4587 | annotations = Qnil; |
| 4588 | |
| 4589 | /* If the file name has special constructs in it, |
| 4590 | call the corresponding file handler. */ |
| 4591 | handler = Ffind_file_name_handler (filename, Qwrite_region); |
| 4592 | /* If FILENAME has no handler, see if VISIT has one. */ |
| 4593 | if (NILP (handler) && STRINGP (visit)) |
| 4594 | handler = Ffind_file_name_handler (visit, Qwrite_region); |
| 4595 | |
| 4596 | if (!NILP (handler)) |
| 4597 | { |
| 4598 | Lisp_Object val; |
| 4599 | val = call6 (handler, Qwrite_region, start, end, |
| 4600 | filename, append, visit); |
| 4601 | |
| 4602 | if (visiting) |
| 4603 | { |
| 4604 | SAVE_MODIFF = MODIFF; |
| 4605 | XSETFASTINT (BVAR (current_buffer, save_length), Z - BEG); |
| 4606 | BVAR (current_buffer, filename) = visit_file; |
| 4607 | } |
| 4608 | UNGCPRO; |
| 4609 | return val; |
| 4610 | } |
| 4611 | |
| 4612 | record_unwind_protect (save_restriction_restore, save_restriction_save ()); |
| 4613 | |
| 4614 | /* Special kludge to simplify auto-saving. */ |
| 4615 | if (NILP (start)) |
| 4616 | { |
| 4617 | /* Do it later, so write-region-annotate-function can work differently |
| 4618 | if we save "the buffer" vs "a region". |
| 4619 | This is useful in tar-mode. --Stef |
| 4620 | XSETFASTINT (start, BEG); |
| 4621 | XSETFASTINT (end, Z); */ |
| 4622 | Fwiden (); |
| 4623 | } |
| 4624 | |
| 4625 | record_unwind_protect (build_annotations_unwind, |
| 4626 | Vwrite_region_annotation_buffers); |
| 4627 | Vwrite_region_annotation_buffers = Fcons (Fcurrent_buffer (), Qnil); |
| 4628 | count1 = SPECPDL_INDEX (); |
| 4629 | |
| 4630 | given_buffer = current_buffer; |
| 4631 | |
| 4632 | if (!STRINGP (start)) |
| 4633 | { |
| 4634 | annotations = build_annotations (start, end); |
| 4635 | |
| 4636 | if (current_buffer != given_buffer) |
| 4637 | { |
| 4638 | XSETFASTINT (start, BEGV); |
| 4639 | XSETFASTINT (end, ZV); |
| 4640 | } |
| 4641 | } |
| 4642 | |
| 4643 | if (NILP (start)) |
| 4644 | { |
| 4645 | XSETFASTINT (start, BEGV); |
| 4646 | XSETFASTINT (end, ZV); |
| 4647 | } |
| 4648 | |
| 4649 | UNGCPRO; |
| 4650 | |
| 4651 | GCPRO5 (start, filename, annotations, visit_file, lockname); |
| 4652 | |
| 4653 | /* Decide the coding-system to encode the data with. |
| 4654 | We used to make this choice before calling build_annotations, but that |
| 4655 | leads to problems when a write-annotate-function takes care of |
| 4656 | unsavable chars (as was the case with X-Symbol). */ |
| 4657 | Vlast_coding_system_used |
| 4658 | = choose_write_coding_system (start, end, filename, |
| 4659 | append, visit, lockname, &coding); |
| 4660 | |
| 4661 | #ifdef CLASH_DETECTION |
| 4662 | if (!auto_saving) |
| 4663 | lock_file (lockname); |
| 4664 | #endif /* CLASH_DETECTION */ |
| 4665 | |
| 4666 | encoded_filename = ENCODE_FILE (filename); |
| 4667 | |
| 4668 | fn = SSDATA (encoded_filename); |
| 4669 | desc = -1; |
| 4670 | if (!NILP (append)) |
| 4671 | #ifdef DOS_NT |
| 4672 | desc = emacs_open (fn, O_WRONLY | O_BINARY, 0); |
| 4673 | #else /* not DOS_NT */ |
| 4674 | desc = emacs_open (fn, O_WRONLY, 0); |
| 4675 | #endif /* not DOS_NT */ |
| 4676 | |
| 4677 | if (desc < 0 && (NILP (append) || errno == ENOENT)) |
| 4678 | #ifdef DOS_NT |
| 4679 | desc = emacs_open (fn, |
| 4680 | O_WRONLY | O_CREAT | O_BINARY |
| 4681 | | (EQ (mustbenew, Qexcl) ? O_EXCL : O_TRUNC), |
| 4682 | S_IREAD | S_IWRITE); |
| 4683 | #else /* not DOS_NT */ |
| 4684 | desc = emacs_open (fn, O_WRONLY | O_TRUNC | O_CREAT |
| 4685 | | (EQ (mustbenew, Qexcl) ? O_EXCL : 0), |
| 4686 | auto_saving ? auto_save_mode_bits : 0666); |
| 4687 | #endif /* not DOS_NT */ |
| 4688 | |
| 4689 | if (desc < 0) |
| 4690 | { |
| 4691 | #ifdef CLASH_DETECTION |
| 4692 | save_errno = errno; |
| 4693 | if (!auto_saving) unlock_file (lockname); |
| 4694 | errno = save_errno; |
| 4695 | #endif /* CLASH_DETECTION */ |
| 4696 | UNGCPRO; |
| 4697 | report_file_error ("Opening output file", Fcons (filename, Qnil)); |
| 4698 | } |
| 4699 | |
| 4700 | record_unwind_protect (close_file_unwind, make_number (desc)); |
| 4701 | |
| 4702 | if (!NILP (append) && !NILP (Ffile_regular_p (filename))) |
| 4703 | { |
| 4704 | off_t ret; |
| 4705 | |
| 4706 | if (NUMBERP (append)) |
| 4707 | ret = emacs_lseek (desc, XINT (append), SEEK_CUR); |
| 4708 | else |
| 4709 | ret = lseek (desc, 0, SEEK_END); |
| 4710 | if (ret < 0) |
| 4711 | { |
| 4712 | #ifdef CLASH_DETECTION |
| 4713 | save_errno = errno; |
| 4714 | if (!auto_saving) unlock_file (lockname); |
| 4715 | errno = save_errno; |
| 4716 | #endif /* CLASH_DETECTION */ |
| 4717 | UNGCPRO; |
| 4718 | report_file_error ("Lseek error", Fcons (filename, Qnil)); |
| 4719 | } |
| 4720 | } |
| 4721 | |
| 4722 | UNGCPRO; |
| 4723 | |
| 4724 | failure = 0; |
| 4725 | immediate_quit = 1; |
| 4726 | |
| 4727 | if (STRINGP (start)) |
| 4728 | { |
| 4729 | failure = 0 > a_write (desc, start, 0, SCHARS (start), |
| 4730 | &annotations, &coding); |
| 4731 | save_errno = errno; |
| 4732 | } |
| 4733 | else if (XINT (start) != XINT (end)) |
| 4734 | { |
| 4735 | failure = 0 > a_write (desc, Qnil, |
| 4736 | XINT (start), XINT (end) - XINT (start), |
| 4737 | &annotations, &coding); |
| 4738 | save_errno = errno; |
| 4739 | } |
| 4740 | else |
| 4741 | { |
| 4742 | /* If file was empty, still need to write the annotations */ |
| 4743 | coding.mode |= CODING_MODE_LAST_BLOCK; |
| 4744 | failure = 0 > a_write (desc, Qnil, XINT (end), 0, &annotations, &coding); |
| 4745 | save_errno = errno; |
| 4746 | } |
| 4747 | |
| 4748 | if (CODING_REQUIRE_FLUSHING (&coding) |
| 4749 | && !(coding.mode & CODING_MODE_LAST_BLOCK) |
| 4750 | && ! failure) |
| 4751 | { |
| 4752 | /* We have to flush out a data. */ |
| 4753 | coding.mode |= CODING_MODE_LAST_BLOCK; |
| 4754 | failure = 0 > e_write (desc, Qnil, 1, 1, &coding); |
| 4755 | save_errno = errno; |
| 4756 | } |
| 4757 | |
| 4758 | immediate_quit = 0; |
| 4759 | |
| 4760 | #ifdef HAVE_FSYNC |
| 4761 | /* Note fsync appears to change the modtime on BSD4.2 (both vax and sun). |
| 4762 | Disk full in NFS may be reported here. */ |
| 4763 | /* mib says that closing the file will try to write as fast as NFS can do |
| 4764 | it, and that means the fsync here is not crucial for autosave files. */ |
| 4765 | if (!auto_saving && !write_region_inhibit_fsync && fsync (desc) < 0) |
| 4766 | { |
| 4767 | /* If fsync fails with EINTR, don't treat that as serious. Also |
| 4768 | ignore EINVAL which happens when fsync is not supported on this |
| 4769 | file. */ |
| 4770 | if (errno != EINTR && errno != EINVAL) |
| 4771 | failure = 1, save_errno = errno; |
| 4772 | } |
| 4773 | #endif |
| 4774 | |
| 4775 | /* NFS can report a write failure now. */ |
| 4776 | if (emacs_close (desc) < 0) |
| 4777 | failure = 1, save_errno = errno; |
| 4778 | |
| 4779 | stat (fn, &st); |
| 4780 | |
| 4781 | /* Discard the unwind protect for close_file_unwind. */ |
| 4782 | specpdl_ptr = specpdl + count1; |
| 4783 | |
| 4784 | /* Call write-region-post-annotation-function. */ |
| 4785 | while (CONSP (Vwrite_region_annotation_buffers)) |
| 4786 | { |
| 4787 | Lisp_Object buf = XCAR (Vwrite_region_annotation_buffers); |
| 4788 | if (!NILP (Fbuffer_live_p (buf))) |
| 4789 | { |
| 4790 | Fset_buffer (buf); |
| 4791 | if (FUNCTIONP (Vwrite_region_post_annotation_function)) |
| 4792 | call0 (Vwrite_region_post_annotation_function); |
| 4793 | } |
| 4794 | Vwrite_region_annotation_buffers |
| 4795 | = XCDR (Vwrite_region_annotation_buffers); |
| 4796 | } |
| 4797 | |
| 4798 | unbind_to (count, Qnil); |
| 4799 | |
| 4800 | #ifdef CLASH_DETECTION |
| 4801 | if (!auto_saving) |
| 4802 | unlock_file (lockname); |
| 4803 | #endif /* CLASH_DETECTION */ |
| 4804 | |
| 4805 | /* Do this before reporting IO error |
| 4806 | to avoid a "file has changed on disk" warning on |
| 4807 | next attempt to save. */ |
| 4808 | if (visiting) |
| 4809 | { |
| 4810 | current_buffer->modtime = get_stat_mtime (&st); |
| 4811 | current_buffer->modtime_size = st.st_size; |
| 4812 | } |
| 4813 | |
| 4814 | if (failure) |
| 4815 | error ("IO error writing %s: %s", SDATA (filename), |
| 4816 | emacs_strerror (save_errno)); |
| 4817 | |
| 4818 | if (visiting) |
| 4819 | { |
| 4820 | SAVE_MODIFF = MODIFF; |
| 4821 | XSETFASTINT (BVAR (current_buffer, save_length), Z - BEG); |
| 4822 | BVAR (current_buffer, filename) = visit_file; |
| 4823 | update_mode_lines++; |
| 4824 | } |
| 4825 | else if (quietly) |
| 4826 | { |
| 4827 | if (auto_saving |
| 4828 | && ! NILP (Fstring_equal (BVAR (current_buffer, filename), |
| 4829 | BVAR (current_buffer, auto_save_file_name)))) |
| 4830 | SAVE_MODIFF = MODIFF; |
| 4831 | |
| 4832 | return Qnil; |
| 4833 | } |
| 4834 | |
| 4835 | if (!auto_saving) |
| 4836 | message_with_string ((INTEGERP (append) |
| 4837 | ? "Updated %s" |
| 4838 | : ! NILP (append) |
| 4839 | ? "Added to %s" |
| 4840 | : "Wrote %s"), |
| 4841 | visit_file, 1); |
| 4842 | |
| 4843 | return Qnil; |
| 4844 | } |
| 4845 | \f |
| 4846 | Lisp_Object merge (Lisp_Object, Lisp_Object, Lisp_Object); |
| 4847 | |
| 4848 | DEFUN ("car-less-than-car", Fcar_less_than_car, Scar_less_than_car, 2, 2, 0, |
| 4849 | doc: /* Return t if (car A) is numerically less than (car B). */) |
| 4850 | (Lisp_Object a, Lisp_Object b) |
| 4851 | { |
| 4852 | return Flss (Fcar (a), Fcar (b)); |
| 4853 | } |
| 4854 | |
| 4855 | /* Build the complete list of annotations appropriate for writing out |
| 4856 | the text between START and END, by calling all the functions in |
| 4857 | write-region-annotate-functions and merging the lists they return. |
| 4858 | If one of these functions switches to a different buffer, we assume |
| 4859 | that buffer contains altered text. Therefore, the caller must |
| 4860 | make sure to restore the current buffer in all cases, |
| 4861 | as save-excursion would do. */ |
| 4862 | |
| 4863 | static Lisp_Object |
| 4864 | build_annotations (Lisp_Object start, Lisp_Object end) |
| 4865 | { |
| 4866 | Lisp_Object annotations; |
| 4867 | Lisp_Object p, res; |
| 4868 | struct gcpro gcpro1, gcpro2; |
| 4869 | Lisp_Object original_buffer; |
| 4870 | int i, used_global = 0; |
| 4871 | |
| 4872 | XSETBUFFER (original_buffer, current_buffer); |
| 4873 | |
| 4874 | annotations = Qnil; |
| 4875 | p = Vwrite_region_annotate_functions; |
| 4876 | GCPRO2 (annotations, p); |
| 4877 | while (CONSP (p)) |
| 4878 | { |
| 4879 | struct buffer *given_buffer = current_buffer; |
| 4880 | if (EQ (Qt, XCAR (p)) && !used_global) |
| 4881 | { /* Use the global value of the hook. */ |
| 4882 | Lisp_Object arg[2]; |
| 4883 | used_global = 1; |
| 4884 | arg[0] = Fdefault_value (Qwrite_region_annotate_functions); |
| 4885 | arg[1] = XCDR (p); |
| 4886 | p = Fappend (2, arg); |
| 4887 | continue; |
| 4888 | } |
| 4889 | Vwrite_region_annotations_so_far = annotations; |
| 4890 | res = call2 (XCAR (p), start, end); |
| 4891 | /* If the function makes a different buffer current, |
| 4892 | assume that means this buffer contains altered text to be output. |
| 4893 | Reset START and END from the buffer bounds |
| 4894 | and discard all previous annotations because they should have |
| 4895 | been dealt with by this function. */ |
| 4896 | if (current_buffer != given_buffer) |
| 4897 | { |
| 4898 | Vwrite_region_annotation_buffers |
| 4899 | = Fcons (Fcurrent_buffer (), |
| 4900 | Vwrite_region_annotation_buffers); |
| 4901 | XSETFASTINT (start, BEGV); |
| 4902 | XSETFASTINT (end, ZV); |
| 4903 | annotations = Qnil; |
| 4904 | } |
| 4905 | Flength (res); /* Check basic validity of return value */ |
| 4906 | annotations = merge (annotations, res, Qcar_less_than_car); |
| 4907 | p = XCDR (p); |
| 4908 | } |
| 4909 | |
| 4910 | /* Now do the same for annotation functions implied by the file-format */ |
| 4911 | if (auto_saving && (!EQ (BVAR (current_buffer, auto_save_file_format), Qt))) |
| 4912 | p = BVAR (current_buffer, auto_save_file_format); |
| 4913 | else |
| 4914 | p = BVAR (current_buffer, file_format); |
| 4915 | for (i = 0; CONSP (p); p = XCDR (p), ++i) |
| 4916 | { |
| 4917 | struct buffer *given_buffer = current_buffer; |
| 4918 | |
| 4919 | Vwrite_region_annotations_so_far = annotations; |
| 4920 | |
| 4921 | /* Value is either a list of annotations or nil if the function |
| 4922 | has written annotations to a temporary buffer, which is now |
| 4923 | current. */ |
| 4924 | res = call5 (Qformat_annotate_function, XCAR (p), start, end, |
| 4925 | original_buffer, make_number (i)); |
| 4926 | if (current_buffer != given_buffer) |
| 4927 | { |
| 4928 | XSETFASTINT (start, BEGV); |
| 4929 | XSETFASTINT (end, ZV); |
| 4930 | annotations = Qnil; |
| 4931 | } |
| 4932 | |
| 4933 | if (CONSP (res)) |
| 4934 | annotations = merge (annotations, res, Qcar_less_than_car); |
| 4935 | } |
| 4936 | |
| 4937 | UNGCPRO; |
| 4938 | return annotations; |
| 4939 | } |
| 4940 | |
| 4941 | \f |
| 4942 | /* Write to descriptor DESC the NCHARS chars starting at POS of STRING. |
| 4943 | If STRING is nil, POS is the character position in the current buffer. |
| 4944 | Intersperse with them the annotations from *ANNOT |
| 4945 | which fall within the range of POS to POS + NCHARS, |
| 4946 | each at its appropriate position. |
| 4947 | |
| 4948 | We modify *ANNOT by discarding elements as we use them up. |
| 4949 | |
| 4950 | The return value is negative in case of system call failure. */ |
| 4951 | |
| 4952 | static int |
| 4953 | a_write (int desc, Lisp_Object string, ptrdiff_t pos, |
| 4954 | register ptrdiff_t nchars, Lisp_Object *annot, |
| 4955 | struct coding_system *coding) |
| 4956 | { |
| 4957 | Lisp_Object tem; |
| 4958 | ptrdiff_t nextpos; |
| 4959 | ptrdiff_t lastpos = pos + nchars; |
| 4960 | |
| 4961 | while (NILP (*annot) || CONSP (*annot)) |
| 4962 | { |
| 4963 | tem = Fcar_safe (Fcar (*annot)); |
| 4964 | nextpos = pos - 1; |
| 4965 | if (INTEGERP (tem)) |
| 4966 | nextpos = XFASTINT (tem); |
| 4967 | |
| 4968 | /* If there are no more annotations in this range, |
| 4969 | output the rest of the range all at once. */ |
| 4970 | if (! (nextpos >= pos && nextpos <= lastpos)) |
| 4971 | return e_write (desc, string, pos, lastpos, coding); |
| 4972 | |
| 4973 | /* Output buffer text up to the next annotation's position. */ |
| 4974 | if (nextpos > pos) |
| 4975 | { |
| 4976 | if (0 > e_write (desc, string, pos, nextpos, coding)) |
| 4977 | return -1; |
| 4978 | pos = nextpos; |
| 4979 | } |
| 4980 | /* Output the annotation. */ |
| 4981 | tem = Fcdr (Fcar (*annot)); |
| 4982 | if (STRINGP (tem)) |
| 4983 | { |
| 4984 | if (0 > e_write (desc, tem, 0, SCHARS (tem), coding)) |
| 4985 | return -1; |
| 4986 | } |
| 4987 | *annot = Fcdr (*annot); |
| 4988 | } |
| 4989 | return 0; |
| 4990 | } |
| 4991 | |
| 4992 | |
| 4993 | /* Write text in the range START and END into descriptor DESC, |
| 4994 | encoding them with coding system CODING. If STRING is nil, START |
| 4995 | and END are character positions of the current buffer, else they |
| 4996 | are indexes to the string STRING. */ |
| 4997 | |
| 4998 | static int |
| 4999 | e_write (int desc, Lisp_Object string, ptrdiff_t start, ptrdiff_t end, |
| 5000 | struct coding_system *coding) |
| 5001 | { |
| 5002 | if (STRINGP (string)) |
| 5003 | { |
| 5004 | start = 0; |
| 5005 | end = SCHARS (string); |
| 5006 | } |
| 5007 | |
| 5008 | /* We used to have a code for handling selective display here. But, |
| 5009 | now it is handled within encode_coding. */ |
| 5010 | |
| 5011 | while (start < end) |
| 5012 | { |
| 5013 | if (STRINGP (string)) |
| 5014 | { |
| 5015 | coding->src_multibyte = SCHARS (string) < SBYTES (string); |
| 5016 | if (CODING_REQUIRE_ENCODING (coding)) |
| 5017 | { |
| 5018 | encode_coding_object (coding, string, |
| 5019 | start, string_char_to_byte (string, start), |
| 5020 | end, string_char_to_byte (string, end), Qt); |
| 5021 | } |
| 5022 | else |
| 5023 | { |
| 5024 | coding->dst_object = string; |
| 5025 | coding->consumed_char = SCHARS (string); |
| 5026 | coding->produced = SBYTES (string); |
| 5027 | } |
| 5028 | } |
| 5029 | else |
| 5030 | { |
| 5031 | ptrdiff_t start_byte = CHAR_TO_BYTE (start); |
| 5032 | ptrdiff_t end_byte = CHAR_TO_BYTE (end); |
| 5033 | |
| 5034 | coding->src_multibyte = (end - start) < (end_byte - start_byte); |
| 5035 | if (CODING_REQUIRE_ENCODING (coding)) |
| 5036 | { |
| 5037 | encode_coding_object (coding, Fcurrent_buffer (), |
| 5038 | start, start_byte, end, end_byte, Qt); |
| 5039 | } |
| 5040 | else |
| 5041 | { |
| 5042 | coding->dst_object = Qnil; |
| 5043 | coding->dst_pos_byte = start_byte; |
| 5044 | if (start >= GPT || end <= GPT) |
| 5045 | { |
| 5046 | coding->consumed_char = end - start; |
| 5047 | coding->produced = end_byte - start_byte; |
| 5048 | } |
| 5049 | else |
| 5050 | { |
| 5051 | coding->consumed_char = GPT - start; |
| 5052 | coding->produced = GPT_BYTE - start_byte; |
| 5053 | } |
| 5054 | } |
| 5055 | } |
| 5056 | |
| 5057 | if (coding->produced > 0) |
| 5058 | { |
| 5059 | coding->produced -= |
| 5060 | emacs_write (desc, |
| 5061 | STRINGP (coding->dst_object) |
| 5062 | ? SSDATA (coding->dst_object) |
| 5063 | : (char *) BYTE_POS_ADDR (coding->dst_pos_byte), |
| 5064 | coding->produced); |
| 5065 | |
| 5066 | if (coding->produced) |
| 5067 | return -1; |
| 5068 | } |
| 5069 | start += coding->consumed_char; |
| 5070 | } |
| 5071 | |
| 5072 | return 0; |
| 5073 | } |
| 5074 | \f |
| 5075 | DEFUN ("verify-visited-file-modtime", Fverify_visited_file_modtime, |
| 5076 | Sverify_visited_file_modtime, 0, 1, 0, |
| 5077 | doc: /* Return t if last mod time of BUF's visited file matches what BUF records. |
| 5078 | This means that the file has not been changed since it was visited or saved. |
| 5079 | If BUF is omitted or nil, it defaults to the current buffer. |
| 5080 | See Info node `(elisp)Modification Time' for more details. */) |
| 5081 | (Lisp_Object buf) |
| 5082 | { |
| 5083 | struct buffer *b; |
| 5084 | struct stat st; |
| 5085 | Lisp_Object handler; |
| 5086 | Lisp_Object filename; |
| 5087 | EMACS_TIME mtime, diff, one_second; |
| 5088 | |
| 5089 | if (NILP (buf)) |
| 5090 | b = current_buffer; |
| 5091 | else |
| 5092 | { |
| 5093 | CHECK_BUFFER (buf); |
| 5094 | b = XBUFFER (buf); |
| 5095 | } |
| 5096 | |
| 5097 | if (!STRINGP (BVAR (b, filename))) return Qt; |
| 5098 | if (EMACS_NSECS (b->modtime) == UNKNOWN_MODTIME_NSECS) return Qt; |
| 5099 | |
| 5100 | /* If the file name has special constructs in it, |
| 5101 | call the corresponding file handler. */ |
| 5102 | handler = Ffind_file_name_handler (BVAR (b, filename), |
| 5103 | Qverify_visited_file_modtime); |
| 5104 | if (!NILP (handler)) |
| 5105 | return call2 (handler, Qverify_visited_file_modtime, buf); |
| 5106 | |
| 5107 | filename = ENCODE_FILE (BVAR (b, filename)); |
| 5108 | |
| 5109 | mtime = (stat (SSDATA (filename), &st) == 0 |
| 5110 | ? get_stat_mtime (&st) |
| 5111 | : time_error_value (errno)); |
| 5112 | if ((EMACS_TIME_EQ (mtime, b->modtime) |
| 5113 | /* If both exist, accept them if they are off by one second. */ |
| 5114 | || (EMACS_TIME_VALID_P (mtime) && EMACS_TIME_VALID_P (b->modtime) |
| 5115 | && ((EMACS_TIME_LT (mtime, b->modtime) |
| 5116 | ? EMACS_SUB_TIME (diff, b->modtime, mtime) |
| 5117 | : EMACS_SUB_TIME (diff, mtime, b->modtime)), |
| 5118 | EMACS_SET_SECS_NSECS (one_second, 1, 0), |
| 5119 | EMACS_TIME_LE (diff, one_second)))) |
| 5120 | && (st.st_size == b->modtime_size |
| 5121 | || b->modtime_size < 0)) |
| 5122 | return Qt; |
| 5123 | return Qnil; |
| 5124 | } |
| 5125 | |
| 5126 | DEFUN ("clear-visited-file-modtime", Fclear_visited_file_modtime, |
| 5127 | Sclear_visited_file_modtime, 0, 0, 0, |
| 5128 | doc: /* Clear out records of last mod time of visited file. |
| 5129 | Next attempt to save will certainly not complain of a discrepancy. */) |
| 5130 | (void) |
| 5131 | { |
| 5132 | EMACS_SET_SECS_NSECS (current_buffer->modtime, 0, UNKNOWN_MODTIME_NSECS); |
| 5133 | current_buffer->modtime_size = -1; |
| 5134 | return Qnil; |
| 5135 | } |
| 5136 | |
| 5137 | DEFUN ("visited-file-modtime", Fvisited_file_modtime, |
| 5138 | Svisited_file_modtime, 0, 0, 0, |
| 5139 | doc: /* Return the current buffer's recorded visited file modification time. |
| 5140 | The value is a list of the form (HIGH LOW USEC PSEC), like the time values that |
| 5141 | `file-attributes' returns. If the current buffer has no recorded file |
| 5142 | modification time, this function returns 0. If the visited file |
| 5143 | doesn't exist, HIGH will be -1. |
| 5144 | See Info node `(elisp)Modification Time' for more details. */) |
| 5145 | (void) |
| 5146 | { |
| 5147 | if (EMACS_NSECS (current_buffer->modtime) < 0) |
| 5148 | return make_number (0); |
| 5149 | return make_lisp_time (current_buffer->modtime); |
| 5150 | } |
| 5151 | |
| 5152 | DEFUN ("set-visited-file-modtime", Fset_visited_file_modtime, |
| 5153 | Sset_visited_file_modtime, 0, 1, 0, |
| 5154 | doc: /* Update buffer's recorded modification time from the visited file's time. |
| 5155 | Useful if the buffer was not read from the file normally |
| 5156 | or if the file itself has been changed for some known benign reason. |
| 5157 | An argument specifies the modification time value to use |
| 5158 | \(instead of that of the visited file), in the form of a list |
| 5159 | \(HIGH LOW USEC PSEC) as returned by `current-time'. */) |
| 5160 | (Lisp_Object time_list) |
| 5161 | { |
| 5162 | if (!NILP (time_list)) |
| 5163 | { |
| 5164 | current_buffer->modtime = lisp_time_argument (time_list); |
| 5165 | current_buffer->modtime_size = -1; |
| 5166 | } |
| 5167 | else |
| 5168 | { |
| 5169 | register Lisp_Object filename; |
| 5170 | struct stat st; |
| 5171 | Lisp_Object handler; |
| 5172 | |
| 5173 | filename = Fexpand_file_name (BVAR (current_buffer, filename), Qnil); |
| 5174 | |
| 5175 | /* If the file name has special constructs in it, |
| 5176 | call the corresponding file handler. */ |
| 5177 | handler = Ffind_file_name_handler (filename, Qset_visited_file_modtime); |
| 5178 | if (!NILP (handler)) |
| 5179 | /* The handler can find the file name the same way we did. */ |
| 5180 | return call2 (handler, Qset_visited_file_modtime, Qnil); |
| 5181 | |
| 5182 | filename = ENCODE_FILE (filename); |
| 5183 | |
| 5184 | if (stat (SSDATA (filename), &st) >= 0) |
| 5185 | { |
| 5186 | current_buffer->modtime = get_stat_mtime (&st); |
| 5187 | current_buffer->modtime_size = st.st_size; |
| 5188 | } |
| 5189 | } |
| 5190 | |
| 5191 | return Qnil; |
| 5192 | } |
| 5193 | \f |
| 5194 | static Lisp_Object |
| 5195 | auto_save_error (Lisp_Object error_val) |
| 5196 | { |
| 5197 | Lisp_Object args[3], msg; |
| 5198 | int i, nbytes; |
| 5199 | struct gcpro gcpro1; |
| 5200 | char *msgbuf; |
| 5201 | USE_SAFE_ALLOCA; |
| 5202 | |
| 5203 | auto_save_error_occurred = 1; |
| 5204 | |
| 5205 | ring_bell (XFRAME (selected_frame)); |
| 5206 | |
| 5207 | args[0] = build_string ("Auto-saving %s: %s"); |
| 5208 | args[1] = BVAR (current_buffer, name); |
| 5209 | args[2] = Ferror_message_string (error_val); |
| 5210 | msg = Fformat (3, args); |
| 5211 | GCPRO1 (msg); |
| 5212 | nbytes = SBYTES (msg); |
| 5213 | SAFE_ALLOCA (msgbuf, char *, nbytes); |
| 5214 | memcpy (msgbuf, SDATA (msg), nbytes); |
| 5215 | |
| 5216 | for (i = 0; i < 3; ++i) |
| 5217 | { |
| 5218 | if (i == 0) |
| 5219 | message2 (msgbuf, nbytes, STRING_MULTIBYTE (msg)); |
| 5220 | else |
| 5221 | message2_nolog (msgbuf, nbytes, STRING_MULTIBYTE (msg)); |
| 5222 | Fsleep_for (make_number (1), Qnil); |
| 5223 | } |
| 5224 | |
| 5225 | SAFE_FREE (); |
| 5226 | UNGCPRO; |
| 5227 | return Qnil; |
| 5228 | } |
| 5229 | |
| 5230 | static Lisp_Object |
| 5231 | auto_save_1 (void) |
| 5232 | { |
| 5233 | struct stat st; |
| 5234 | Lisp_Object modes; |
| 5235 | |
| 5236 | auto_save_mode_bits = 0666; |
| 5237 | |
| 5238 | /* Get visited file's mode to become the auto save file's mode. */ |
| 5239 | if (! NILP (BVAR (current_buffer, filename))) |
| 5240 | { |
| 5241 | if (stat (SSDATA (BVAR (current_buffer, filename)), &st) >= 0) |
| 5242 | /* But make sure we can overwrite it later! */ |
| 5243 | auto_save_mode_bits = (st.st_mode | 0600) & 0777; |
| 5244 | else if ((modes = Ffile_modes (BVAR (current_buffer, filename)), |
| 5245 | INTEGERP (modes))) |
| 5246 | /* Remote files don't cooperate with stat. */ |
| 5247 | auto_save_mode_bits = (XINT (modes) | 0600) & 0777; |
| 5248 | } |
| 5249 | |
| 5250 | return |
| 5251 | Fwrite_region (Qnil, Qnil, BVAR (current_buffer, auto_save_file_name), Qnil, |
| 5252 | NILP (Vauto_save_visited_file_name) ? Qlambda : Qt, |
| 5253 | Qnil, Qnil); |
| 5254 | } |
| 5255 | |
| 5256 | static Lisp_Object |
| 5257 | do_auto_save_unwind (Lisp_Object arg) /* used as unwind-protect function */ |
| 5258 | |
| 5259 | { |
| 5260 | FILE *stream = (FILE *) XSAVE_VALUE (arg)->pointer; |
| 5261 | auto_saving = 0; |
| 5262 | if (stream != NULL) |
| 5263 | { |
| 5264 | BLOCK_INPUT; |
| 5265 | fclose (stream); |
| 5266 | UNBLOCK_INPUT; |
| 5267 | } |
| 5268 | return Qnil; |
| 5269 | } |
| 5270 | |
| 5271 | static Lisp_Object |
| 5272 | do_auto_save_unwind_1 (Lisp_Object value) /* used as unwind-protect function */ |
| 5273 | |
| 5274 | { |
| 5275 | minibuffer_auto_raise = XINT (value); |
| 5276 | return Qnil; |
| 5277 | } |
| 5278 | |
| 5279 | static Lisp_Object |
| 5280 | do_auto_save_make_dir (Lisp_Object dir) |
| 5281 | { |
| 5282 | Lisp_Object result; |
| 5283 | |
| 5284 | auto_saving_dir_umask = 077; |
| 5285 | result = call2 (Qmake_directory, dir, Qt); |
| 5286 | auto_saving_dir_umask = 0; |
| 5287 | return result; |
| 5288 | } |
| 5289 | |
| 5290 | static Lisp_Object |
| 5291 | do_auto_save_eh (Lisp_Object ignore) |
| 5292 | { |
| 5293 | auto_saving_dir_umask = 0; |
| 5294 | return Qnil; |
| 5295 | } |
| 5296 | |
| 5297 | DEFUN ("do-auto-save", Fdo_auto_save, Sdo_auto_save, 0, 2, "", |
| 5298 | doc: /* Auto-save all buffers that need it. |
| 5299 | This is all buffers that have auto-saving enabled |
| 5300 | and are changed since last auto-saved. |
| 5301 | Auto-saving writes the buffer into a file |
| 5302 | so that your editing is not lost if the system crashes. |
| 5303 | This file is not the file you visited; that changes only when you save. |
| 5304 | Normally we run the normal hook `auto-save-hook' before saving. |
| 5305 | |
| 5306 | A non-nil NO-MESSAGE argument means do not print any message if successful. |
| 5307 | A non-nil CURRENT-ONLY argument means save only current buffer. */) |
| 5308 | (Lisp_Object no_message, Lisp_Object current_only) |
| 5309 | { |
| 5310 | struct buffer *old = current_buffer, *b; |
| 5311 | Lisp_Object tail, buf, hook; |
| 5312 | int auto_saved = 0; |
| 5313 | int do_handled_files; |
| 5314 | Lisp_Object oquit; |
| 5315 | FILE *stream = NULL; |
| 5316 | ptrdiff_t count = SPECPDL_INDEX (); |
| 5317 | int orig_minibuffer_auto_raise = minibuffer_auto_raise; |
| 5318 | int old_message_p = 0; |
| 5319 | struct gcpro gcpro1, gcpro2; |
| 5320 | |
| 5321 | if (max_specpdl_size < specpdl_size + 40) |
| 5322 | max_specpdl_size = specpdl_size + 40; |
| 5323 | |
| 5324 | if (minibuf_level) |
| 5325 | no_message = Qt; |
| 5326 | |
| 5327 | if (NILP (no_message)) |
| 5328 | { |
| 5329 | old_message_p = push_message (); |
| 5330 | record_unwind_protect (pop_message_unwind, Qnil); |
| 5331 | } |
| 5332 | |
| 5333 | /* Ordinarily don't quit within this function, |
| 5334 | but don't make it impossible to quit (in case we get hung in I/O). */ |
| 5335 | oquit = Vquit_flag; |
| 5336 | Vquit_flag = Qnil; |
| 5337 | |
| 5338 | /* No GCPRO needed, because (when it matters) all Lisp_Object variables |
| 5339 | point to non-strings reached from Vbuffer_alist. */ |
| 5340 | |
| 5341 | hook = intern ("auto-save-hook"); |
| 5342 | Frun_hooks (1, &hook); |
| 5343 | |
| 5344 | if (STRINGP (Vauto_save_list_file_name)) |
| 5345 | { |
| 5346 | Lisp_Object listfile; |
| 5347 | |
| 5348 | listfile = Fexpand_file_name (Vauto_save_list_file_name, Qnil); |
| 5349 | |
| 5350 | /* Don't try to create the directory when shutting down Emacs, |
| 5351 | because creating the directory might signal an error, and |
| 5352 | that would leave Emacs in a strange state. */ |
| 5353 | if (!NILP (Vrun_hooks)) |
| 5354 | { |
| 5355 | Lisp_Object dir; |
| 5356 | dir = Qnil; |
| 5357 | GCPRO2 (dir, listfile); |
| 5358 | dir = Ffile_name_directory (listfile); |
| 5359 | if (NILP (Ffile_directory_p (dir))) |
| 5360 | internal_condition_case_1 (do_auto_save_make_dir, |
| 5361 | dir, Qt, |
| 5362 | do_auto_save_eh); |
| 5363 | UNGCPRO; |
| 5364 | } |
| 5365 | |
| 5366 | stream = fopen (SSDATA (listfile), "w"); |
| 5367 | } |
| 5368 | |
| 5369 | record_unwind_protect (do_auto_save_unwind, |
| 5370 | make_save_value (stream, 0)); |
| 5371 | record_unwind_protect (do_auto_save_unwind_1, |
| 5372 | make_number (minibuffer_auto_raise)); |
| 5373 | minibuffer_auto_raise = 0; |
| 5374 | auto_saving = 1; |
| 5375 | auto_save_error_occurred = 0; |
| 5376 | |
| 5377 | /* On first pass, save all files that don't have handlers. |
| 5378 | On second pass, save all files that do have handlers. |
| 5379 | |
| 5380 | If Emacs is crashing, the handlers may tweak what is causing |
| 5381 | Emacs to crash in the first place, and it would be a shame if |
| 5382 | Emacs failed to autosave perfectly ordinary files because it |
| 5383 | couldn't handle some ange-ftp'd file. */ |
| 5384 | |
| 5385 | for (do_handled_files = 0; do_handled_files < 2; do_handled_files++) |
| 5386 | for (tail = Vbuffer_alist; CONSP (tail); tail = XCDR (tail)) |
| 5387 | { |
| 5388 | buf = XCDR (XCAR (tail)); |
| 5389 | b = XBUFFER (buf); |
| 5390 | |
| 5391 | /* Record all the buffers that have auto save mode |
| 5392 | in the special file that lists them. For each of these buffers, |
| 5393 | Record visited name (if any) and auto save name. */ |
| 5394 | if (STRINGP (BVAR (b, auto_save_file_name)) |
| 5395 | && stream != NULL && do_handled_files == 0) |
| 5396 | { |
| 5397 | BLOCK_INPUT; |
| 5398 | if (!NILP (BVAR (b, filename))) |
| 5399 | { |
| 5400 | fwrite (SDATA (BVAR (b, filename)), 1, |
| 5401 | SBYTES (BVAR (b, filename)), stream); |
| 5402 | } |
| 5403 | putc ('\n', stream); |
| 5404 | fwrite (SDATA (BVAR (b, auto_save_file_name)), 1, |
| 5405 | SBYTES (BVAR (b, auto_save_file_name)), stream); |
| 5406 | putc ('\n', stream); |
| 5407 | UNBLOCK_INPUT; |
| 5408 | } |
| 5409 | |
| 5410 | if (!NILP (current_only) |
| 5411 | && b != current_buffer) |
| 5412 | continue; |
| 5413 | |
| 5414 | /* Don't auto-save indirect buffers. |
| 5415 | The base buffer takes care of it. */ |
| 5416 | if (b->base_buffer) |
| 5417 | continue; |
| 5418 | |
| 5419 | /* Check for auto save enabled |
| 5420 | and file changed since last auto save |
| 5421 | and file changed since last real save. */ |
| 5422 | if (STRINGP (BVAR (b, auto_save_file_name)) |
| 5423 | && BUF_SAVE_MODIFF (b) < BUF_MODIFF (b) |
| 5424 | && BUF_AUTOSAVE_MODIFF (b) < BUF_MODIFF (b) |
| 5425 | /* -1 means we've turned off autosaving for a while--see below. */ |
| 5426 | && XINT (BVAR (b, save_length)) >= 0 |
| 5427 | && (do_handled_files |
| 5428 | || NILP (Ffind_file_name_handler (BVAR (b, auto_save_file_name), |
| 5429 | Qwrite_region)))) |
| 5430 | { |
| 5431 | EMACS_TIME before_time, after_time; |
| 5432 | |
| 5433 | EMACS_GET_TIME (before_time); |
| 5434 | |
| 5435 | /* If we had a failure, don't try again for 20 minutes. */ |
| 5436 | if (b->auto_save_failure_time > 0 |
| 5437 | && EMACS_SECS (before_time) - b->auto_save_failure_time < 1200) |
| 5438 | continue; |
| 5439 | |
| 5440 | set_buffer_internal (b); |
| 5441 | if (NILP (Vauto_save_include_big_deletions) |
| 5442 | && (XFASTINT (BVAR (b, save_length)) * 10 |
| 5443 | > (BUF_Z (b) - BUF_BEG (b)) * 13) |
| 5444 | /* A short file is likely to change a large fraction; |
| 5445 | spare the user annoying messages. */ |
| 5446 | && XFASTINT (BVAR (b, save_length)) > 5000 |
| 5447 | /* These messages are frequent and annoying for `*mail*'. */ |
| 5448 | && !EQ (BVAR (b, filename), Qnil) |
| 5449 | && NILP (no_message)) |
| 5450 | { |
| 5451 | /* It has shrunk too much; turn off auto-saving here. */ |
| 5452 | minibuffer_auto_raise = orig_minibuffer_auto_raise; |
| 5453 | message_with_string ("Buffer %s has shrunk a lot; auto save disabled in that buffer until next real save", |
| 5454 | BVAR (b, name), 1); |
| 5455 | minibuffer_auto_raise = 0; |
| 5456 | /* Turn off auto-saving until there's a real save, |
| 5457 | and prevent any more warnings. */ |
| 5458 | XSETINT (BVAR (b, save_length), -1); |
| 5459 | Fsleep_for (make_number (1), Qnil); |
| 5460 | continue; |
| 5461 | } |
| 5462 | if (!auto_saved && NILP (no_message)) |
| 5463 | message1 ("Auto-saving..."); |
| 5464 | internal_condition_case (auto_save_1, Qt, auto_save_error); |
| 5465 | auto_saved++; |
| 5466 | BUF_AUTOSAVE_MODIFF (b) = BUF_MODIFF (b); |
| 5467 | XSETFASTINT (BVAR (current_buffer, save_length), Z - BEG); |
| 5468 | set_buffer_internal (old); |
| 5469 | |
| 5470 | EMACS_GET_TIME (after_time); |
| 5471 | |
| 5472 | /* If auto-save took more than 60 seconds, |
| 5473 | assume it was an NFS failure that got a timeout. */ |
| 5474 | if (EMACS_SECS (after_time) - EMACS_SECS (before_time) > 60) |
| 5475 | b->auto_save_failure_time = EMACS_SECS (after_time); |
| 5476 | } |
| 5477 | } |
| 5478 | |
| 5479 | /* Prevent another auto save till enough input events come in. */ |
| 5480 | record_auto_save (); |
| 5481 | |
| 5482 | if (auto_saved && NILP (no_message)) |
| 5483 | { |
| 5484 | if (old_message_p) |
| 5485 | { |
| 5486 | /* If we are going to restore an old message, |
| 5487 | give time to read ours. */ |
| 5488 | sit_for (make_number (1), 0, 0); |
| 5489 | restore_message (); |
| 5490 | } |
| 5491 | else if (!auto_save_error_occurred) |
| 5492 | /* Don't overwrite the error message if an error occurred. |
| 5493 | If we displayed a message and then restored a state |
| 5494 | with no message, leave a "done" message on the screen. */ |
| 5495 | message1 ("Auto-saving...done"); |
| 5496 | } |
| 5497 | |
| 5498 | Vquit_flag = oquit; |
| 5499 | |
| 5500 | /* This restores the message-stack status. */ |
| 5501 | unbind_to (count, Qnil); |
| 5502 | return Qnil; |
| 5503 | } |
| 5504 | |
| 5505 | DEFUN ("set-buffer-auto-saved", Fset_buffer_auto_saved, |
| 5506 | Sset_buffer_auto_saved, 0, 0, 0, |
| 5507 | doc: /* Mark current buffer as auto-saved with its current text. |
| 5508 | No auto-save file will be written until the buffer changes again. */) |
| 5509 | (void) |
| 5510 | { |
| 5511 | /* FIXME: This should not be called in indirect buffers, since |
| 5512 | they're not autosaved. */ |
| 5513 | BUF_AUTOSAVE_MODIFF (current_buffer) = MODIFF; |
| 5514 | XSETFASTINT (BVAR (current_buffer, save_length), Z - BEG); |
| 5515 | current_buffer->auto_save_failure_time = 0; |
| 5516 | return Qnil; |
| 5517 | } |
| 5518 | |
| 5519 | DEFUN ("clear-buffer-auto-save-failure", Fclear_buffer_auto_save_failure, |
| 5520 | Sclear_buffer_auto_save_failure, 0, 0, 0, |
| 5521 | doc: /* Clear any record of a recent auto-save failure in the current buffer. */) |
| 5522 | (void) |
| 5523 | { |
| 5524 | current_buffer->auto_save_failure_time = 0; |
| 5525 | return Qnil; |
| 5526 | } |
| 5527 | |
| 5528 | DEFUN ("recent-auto-save-p", Frecent_auto_save_p, Srecent_auto_save_p, |
| 5529 | 0, 0, 0, |
| 5530 | doc: /* Return t if current buffer has been auto-saved recently. |
| 5531 | More precisely, if it has been auto-saved since last read from or saved |
| 5532 | in the visited file. If the buffer has no visited file, |
| 5533 | then any auto-save counts as "recent". */) |
| 5534 | (void) |
| 5535 | { |
| 5536 | /* FIXME: maybe we should return nil for indirect buffers since |
| 5537 | they're never autosaved. */ |
| 5538 | return (SAVE_MODIFF < BUF_AUTOSAVE_MODIFF (current_buffer) ? Qt : Qnil); |
| 5539 | } |
| 5540 | \f |
| 5541 | /* Reading and completing file names */ |
| 5542 | |
| 5543 | DEFUN ("next-read-file-uses-dialog-p", Fnext_read_file_uses_dialog_p, |
| 5544 | Snext_read_file_uses_dialog_p, 0, 0, 0, |
| 5545 | doc: /* Return t if a call to `read-file-name' will use a dialog. |
| 5546 | The return value is only relevant for a call to `read-file-name' that happens |
| 5547 | before any other event (mouse or keypress) is handled. */) |
| 5548 | (void) |
| 5549 | { |
| 5550 | #if defined (USE_MOTIF) || defined (HAVE_NTGUI) || defined (USE_GTK) |
| 5551 | if ((NILP (last_nonmenu_event) || CONSP (last_nonmenu_event)) |
| 5552 | && use_dialog_box |
| 5553 | && use_file_dialog |
| 5554 | && have_menus_p ()) |
| 5555 | return Qt; |
| 5556 | #endif |
| 5557 | return Qnil; |
| 5558 | } |
| 5559 | |
| 5560 | Lisp_Object |
| 5561 | Fread_file_name (Lisp_Object prompt, Lisp_Object dir, Lisp_Object default_filename, Lisp_Object mustmatch, Lisp_Object initial, Lisp_Object predicate) |
| 5562 | { |
| 5563 | struct gcpro gcpro1; |
| 5564 | Lisp_Object args[7]; |
| 5565 | |
| 5566 | GCPRO1 (default_filename); |
| 5567 | args[0] = intern ("read-file-name"); |
| 5568 | args[1] = prompt; |
| 5569 | args[2] = dir; |
| 5570 | args[3] = default_filename; |
| 5571 | args[4] = mustmatch; |
| 5572 | args[5] = initial; |
| 5573 | args[6] = predicate; |
| 5574 | RETURN_UNGCPRO (Ffuncall (7, args)); |
| 5575 | } |
| 5576 | |
| 5577 | \f |
| 5578 | void |
| 5579 | syms_of_fileio (void) |
| 5580 | { |
| 5581 | DEFSYM (Qoperations, "operations"); |
| 5582 | DEFSYM (Qexpand_file_name, "expand-file-name"); |
| 5583 | DEFSYM (Qsubstitute_in_file_name, "substitute-in-file-name"); |
| 5584 | DEFSYM (Qdirectory_file_name, "directory-file-name"); |
| 5585 | DEFSYM (Qfile_name_directory, "file-name-directory"); |
| 5586 | DEFSYM (Qfile_name_nondirectory, "file-name-nondirectory"); |
| 5587 | DEFSYM (Qunhandled_file_name_directory, "unhandled-file-name-directory"); |
| 5588 | DEFSYM (Qfile_name_as_directory, "file-name-as-directory"); |
| 5589 | DEFSYM (Qcopy_file, "copy-file"); |
| 5590 | DEFSYM (Qmake_directory_internal, "make-directory-internal"); |
| 5591 | DEFSYM (Qmake_directory, "make-directory"); |
| 5592 | DEFSYM (Qdelete_directory_internal, "delete-directory-internal"); |
| 5593 | DEFSYM (Qdelete_file, "delete-file"); |
| 5594 | DEFSYM (Qrename_file, "rename-file"); |
| 5595 | DEFSYM (Qadd_name_to_file, "add-name-to-file"); |
| 5596 | DEFSYM (Qmake_symbolic_link, "make-symbolic-link"); |
| 5597 | DEFSYM (Qfile_exists_p, "file-exists-p"); |
| 5598 | DEFSYM (Qfile_executable_p, "file-executable-p"); |
| 5599 | DEFSYM (Qfile_readable_p, "file-readable-p"); |
| 5600 | DEFSYM (Qfile_writable_p, "file-writable-p"); |
| 5601 | DEFSYM (Qfile_symlink_p, "file-symlink-p"); |
| 5602 | DEFSYM (Qaccess_file, "access-file"); |
| 5603 | DEFSYM (Qfile_directory_p, "file-directory-p"); |
| 5604 | DEFSYM (Qfile_regular_p, "file-regular-p"); |
| 5605 | DEFSYM (Qfile_accessible_directory_p, "file-accessible-directory-p"); |
| 5606 | DEFSYM (Qfile_modes, "file-modes"); |
| 5607 | DEFSYM (Qset_file_modes, "set-file-modes"); |
| 5608 | DEFSYM (Qset_file_times, "set-file-times"); |
| 5609 | DEFSYM (Qfile_selinux_context, "file-selinux-context"); |
| 5610 | DEFSYM (Qset_file_selinux_context, "set-file-selinux-context"); |
| 5611 | DEFSYM (Qfile_newer_than_file_p, "file-newer-than-file-p"); |
| 5612 | DEFSYM (Qinsert_file_contents, "insert-file-contents"); |
| 5613 | DEFSYM (Qwrite_region, "write-region"); |
| 5614 | DEFSYM (Qverify_visited_file_modtime, "verify-visited-file-modtime"); |
| 5615 | DEFSYM (Qset_visited_file_modtime, "set-visited-file-modtime"); |
| 5616 | DEFSYM (Qauto_save_coding, "auto-save-coding"); |
| 5617 | |
| 5618 | DEFSYM (Qfile_name_history, "file-name-history"); |
| 5619 | Fset (Qfile_name_history, Qnil); |
| 5620 | |
| 5621 | DEFSYM (Qfile_error, "file-error"); |
| 5622 | DEFSYM (Qfile_already_exists, "file-already-exists"); |
| 5623 | DEFSYM (Qfile_date_error, "file-date-error"); |
| 5624 | DEFSYM (Qexcl, "excl"); |
| 5625 | |
| 5626 | DEFVAR_LISP ("file-name-coding-system", Vfile_name_coding_system, |
| 5627 | doc: /* Coding system for encoding file names. |
| 5628 | If it is nil, `default-file-name-coding-system' (which see) is used. */); |
| 5629 | Vfile_name_coding_system = Qnil; |
| 5630 | |
| 5631 | DEFVAR_LISP ("default-file-name-coding-system", |
| 5632 | Vdefault_file_name_coding_system, |
| 5633 | doc: /* Default coding system for encoding file names. |
| 5634 | This variable is used only when `file-name-coding-system' is nil. |
| 5635 | |
| 5636 | This variable is set/changed by the command `set-language-environment'. |
| 5637 | User should not set this variable manually, |
| 5638 | instead use `file-name-coding-system' to get a constant encoding |
| 5639 | of file names regardless of the current language environment. */); |
| 5640 | Vdefault_file_name_coding_system = Qnil; |
| 5641 | |
| 5642 | DEFSYM (Qformat_decode, "format-decode"); |
| 5643 | DEFSYM (Qformat_annotate_function, "format-annotate-function"); |
| 5644 | DEFSYM (Qafter_insert_file_set_coding, "after-insert-file-set-coding"); |
| 5645 | DEFSYM (Qcar_less_than_car, "car-less-than-car"); |
| 5646 | |
| 5647 | Fput (Qfile_error, Qerror_conditions, |
| 5648 | Fpurecopy (list2 (Qfile_error, Qerror))); |
| 5649 | Fput (Qfile_error, Qerror_message, |
| 5650 | build_pure_c_string ("File error")); |
| 5651 | |
| 5652 | Fput (Qfile_already_exists, Qerror_conditions, |
| 5653 | Fpurecopy (list3 (Qfile_already_exists, Qfile_error, Qerror))); |
| 5654 | Fput (Qfile_already_exists, Qerror_message, |
| 5655 | build_pure_c_string ("File already exists")); |
| 5656 | |
| 5657 | Fput (Qfile_date_error, Qerror_conditions, |
| 5658 | Fpurecopy (list3 (Qfile_date_error, Qfile_error, Qerror))); |
| 5659 | Fput (Qfile_date_error, Qerror_message, |
| 5660 | build_pure_c_string ("Cannot set file date")); |
| 5661 | |
| 5662 | DEFVAR_LISP ("file-name-handler-alist", Vfile_name_handler_alist, |
| 5663 | doc: /* Alist of elements (REGEXP . HANDLER) for file names handled specially. |
| 5664 | If a file name matches REGEXP, all I/O on that file is done by calling |
| 5665 | HANDLER. If a file name matches more than one handler, the handler |
| 5666 | whose match starts last in the file name gets precedence. The |
| 5667 | function `find-file-name-handler' checks this list for a handler for |
| 5668 | its argument. |
| 5669 | |
| 5670 | HANDLER should be a function. The first argument given to it is the |
| 5671 | name of the I/O primitive to be handled; the remaining arguments are |
| 5672 | the arguments that were passed to that primitive. For example, if you |
| 5673 | do (file-exists-p FILENAME) and FILENAME is handled by HANDLER, then |
| 5674 | HANDLER is called like this: |
| 5675 | |
| 5676 | (funcall HANDLER 'file-exists-p FILENAME) |
| 5677 | |
| 5678 | Note that HANDLER must be able to handle all I/O primitives; if it has |
| 5679 | nothing special to do for a primitive, it should reinvoke the |
| 5680 | primitive to handle the operation \"the usual way\". |
| 5681 | See Info node `(elisp)Magic File Names' for more details. */); |
| 5682 | Vfile_name_handler_alist = Qnil; |
| 5683 | |
| 5684 | DEFVAR_LISP ("set-auto-coding-function", |
| 5685 | Vset_auto_coding_function, |
| 5686 | doc: /* If non-nil, a function to call to decide a coding system of file. |
| 5687 | Two arguments are passed to this function: the file name |
| 5688 | and the length of a file contents following the point. |
| 5689 | This function should return a coding system to decode the file contents. |
| 5690 | It should check the file name against `auto-coding-alist'. |
| 5691 | If no coding system is decided, it should check a coding system |
| 5692 | specified in the heading lines with the format: |
| 5693 | -*- ... coding: CODING-SYSTEM; ... -*- |
| 5694 | or local variable spec of the tailing lines with `coding:' tag. */); |
| 5695 | Vset_auto_coding_function = Qnil; |
| 5696 | |
| 5697 | DEFVAR_LISP ("after-insert-file-functions", Vafter_insert_file_functions, |
| 5698 | doc: /* A list of functions to be called at the end of `insert-file-contents'. |
| 5699 | Each is passed one argument, the number of characters inserted, |
| 5700 | with point at the start of the inserted text. Each function |
| 5701 | should leave point the same, and return the new character count. |
| 5702 | If `insert-file-contents' is intercepted by a handler from |
| 5703 | `file-name-handler-alist', that handler is responsible for calling the |
| 5704 | functions in `after-insert-file-functions' if appropriate. */); |
| 5705 | Vafter_insert_file_functions = Qnil; |
| 5706 | |
| 5707 | DEFVAR_LISP ("write-region-annotate-functions", Vwrite_region_annotate_functions, |
| 5708 | doc: /* A list of functions to be called at the start of `write-region'. |
| 5709 | Each is passed two arguments, START and END as for `write-region'. |
| 5710 | These are usually two numbers but not always; see the documentation |
| 5711 | for `write-region'. The function should return a list of pairs |
| 5712 | of the form (POSITION . STRING), consisting of strings to be effectively |
| 5713 | inserted at the specified positions of the file being written (1 means to |
| 5714 | insert before the first byte written). The POSITIONs must be sorted into |
| 5715 | increasing order. |
| 5716 | |
| 5717 | If there are several annotation functions, the lists returned by these |
| 5718 | functions are merged destructively. As each annotation function runs, |
| 5719 | the variable `write-region-annotations-so-far' contains a list of all |
| 5720 | annotations returned by previous annotation functions. |
| 5721 | |
| 5722 | An annotation function can return with a different buffer current. |
| 5723 | Doing so removes the annotations returned by previous functions, and |
| 5724 | resets START and END to `point-min' and `point-max' of the new buffer. |
| 5725 | |
| 5726 | After `write-region' completes, Emacs calls the function stored in |
| 5727 | `write-region-post-annotation-function', once for each buffer that was |
| 5728 | current when building the annotations (i.e., at least once), with that |
| 5729 | buffer current. */); |
| 5730 | Vwrite_region_annotate_functions = Qnil; |
| 5731 | DEFSYM (Qwrite_region_annotate_functions, "write-region-annotate-functions"); |
| 5732 | |
| 5733 | DEFVAR_LISP ("write-region-post-annotation-function", |
| 5734 | Vwrite_region_post_annotation_function, |
| 5735 | doc: /* Function to call after `write-region' completes. |
| 5736 | The function is called with no arguments. If one or more of the |
| 5737 | annotation functions in `write-region-annotate-functions' changed the |
| 5738 | current buffer, the function stored in this variable is called for |
| 5739 | each of those additional buffers as well, in addition to the original |
| 5740 | buffer. The relevant buffer is current during each function call. */); |
| 5741 | Vwrite_region_post_annotation_function = Qnil; |
| 5742 | staticpro (&Vwrite_region_annotation_buffers); |
| 5743 | |
| 5744 | DEFVAR_LISP ("write-region-annotations-so-far", |
| 5745 | Vwrite_region_annotations_so_far, |
| 5746 | doc: /* When an annotation function is called, this holds the previous annotations. |
| 5747 | These are the annotations made by other annotation functions |
| 5748 | that were already called. See also `write-region-annotate-functions'. */); |
| 5749 | Vwrite_region_annotations_so_far = Qnil; |
| 5750 | |
| 5751 | DEFVAR_LISP ("inhibit-file-name-handlers", Vinhibit_file_name_handlers, |
| 5752 | doc: /* A list of file name handlers that temporarily should not be used. |
| 5753 | This applies only to the operation `inhibit-file-name-operation'. */); |
| 5754 | Vinhibit_file_name_handlers = Qnil; |
| 5755 | |
| 5756 | DEFVAR_LISP ("inhibit-file-name-operation", Vinhibit_file_name_operation, |
| 5757 | doc: /* The operation for which `inhibit-file-name-handlers' is applicable. */); |
| 5758 | Vinhibit_file_name_operation = Qnil; |
| 5759 | |
| 5760 | DEFVAR_LISP ("auto-save-list-file-name", Vauto_save_list_file_name, |
| 5761 | doc: /* File name in which we write a list of all auto save file names. |
| 5762 | This variable is initialized automatically from `auto-save-list-file-prefix' |
| 5763 | shortly after Emacs reads your `.emacs' file, if you have not yet given it |
| 5764 | a non-nil value. */); |
| 5765 | Vauto_save_list_file_name = Qnil; |
| 5766 | |
| 5767 | DEFVAR_LISP ("auto-save-visited-file-name", Vauto_save_visited_file_name, |
| 5768 | doc: /* Non-nil says auto-save a buffer in the file it is visiting, when practical. |
| 5769 | Normally auto-save files are written under other names. */); |
| 5770 | Vauto_save_visited_file_name = Qnil; |
| 5771 | |
| 5772 | DEFVAR_LISP ("auto-save-include-big-deletions", Vauto_save_include_big_deletions, |
| 5773 | doc: /* If non-nil, auto-save even if a large part of the text is deleted. |
| 5774 | If nil, deleting a substantial portion of the text disables auto-save |
| 5775 | in the buffer; this is the default behavior, because the auto-save |
| 5776 | file is usually more useful if it contains the deleted text. */); |
| 5777 | Vauto_save_include_big_deletions = Qnil; |
| 5778 | |
| 5779 | #ifdef HAVE_FSYNC |
| 5780 | DEFVAR_BOOL ("write-region-inhibit-fsync", write_region_inhibit_fsync, |
| 5781 | doc: /* Non-nil means don't call fsync in `write-region'. |
| 5782 | This variable affects calls to `write-region' as well as save commands. |
| 5783 | A non-nil value may result in data loss! */); |
| 5784 | write_region_inhibit_fsync = 0; |
| 5785 | #endif |
| 5786 | |
| 5787 | DEFVAR_BOOL ("delete-by-moving-to-trash", delete_by_moving_to_trash, |
| 5788 | doc: /* Specifies whether to use the system's trash can. |
| 5789 | When non-nil, certain file deletion commands use the function |
| 5790 | `move-file-to-trash' instead of deleting files outright. |
| 5791 | This includes interactive calls to `delete-file' and |
| 5792 | `delete-directory' and the Dired deletion commands. */); |
| 5793 | delete_by_moving_to_trash = 0; |
| 5794 | Qdelete_by_moving_to_trash = intern_c_string ("delete-by-moving-to-trash"); |
| 5795 | |
| 5796 | DEFSYM (Qmove_file_to_trash, "move-file-to-trash"); |
| 5797 | DEFSYM (Qcopy_directory, "copy-directory"); |
| 5798 | DEFSYM (Qdelete_directory, "delete-directory"); |
| 5799 | |
| 5800 | defsubr (&Sfind_file_name_handler); |
| 5801 | defsubr (&Sfile_name_directory); |
| 5802 | defsubr (&Sfile_name_nondirectory); |
| 5803 | defsubr (&Sunhandled_file_name_directory); |
| 5804 | defsubr (&Sfile_name_as_directory); |
| 5805 | defsubr (&Sdirectory_file_name); |
| 5806 | defsubr (&Smake_temp_name); |
| 5807 | defsubr (&Sexpand_file_name); |
| 5808 | defsubr (&Ssubstitute_in_file_name); |
| 5809 | defsubr (&Scopy_file); |
| 5810 | defsubr (&Smake_directory_internal); |
| 5811 | defsubr (&Sdelete_directory_internal); |
| 5812 | defsubr (&Sdelete_file); |
| 5813 | defsubr (&Srename_file); |
| 5814 | defsubr (&Sadd_name_to_file); |
| 5815 | defsubr (&Smake_symbolic_link); |
| 5816 | defsubr (&Sfile_name_absolute_p); |
| 5817 | defsubr (&Sfile_exists_p); |
| 5818 | defsubr (&Sfile_executable_p); |
| 5819 | defsubr (&Sfile_readable_p); |
| 5820 | defsubr (&Sfile_writable_p); |
| 5821 | defsubr (&Saccess_file); |
| 5822 | defsubr (&Sfile_symlink_p); |
| 5823 | defsubr (&Sfile_directory_p); |
| 5824 | defsubr (&Sfile_accessible_directory_p); |
| 5825 | defsubr (&Sfile_regular_p); |
| 5826 | defsubr (&Sfile_modes); |
| 5827 | defsubr (&Sset_file_modes); |
| 5828 | defsubr (&Sset_file_times); |
| 5829 | defsubr (&Sfile_selinux_context); |
| 5830 | defsubr (&Sset_file_selinux_context); |
| 5831 | defsubr (&Sset_default_file_modes); |
| 5832 | defsubr (&Sdefault_file_modes); |
| 5833 | defsubr (&Sfile_newer_than_file_p); |
| 5834 | defsubr (&Sinsert_file_contents); |
| 5835 | defsubr (&Swrite_region); |
| 5836 | defsubr (&Scar_less_than_car); |
| 5837 | defsubr (&Sverify_visited_file_modtime); |
| 5838 | defsubr (&Sclear_visited_file_modtime); |
| 5839 | defsubr (&Svisited_file_modtime); |
| 5840 | defsubr (&Sset_visited_file_modtime); |
| 5841 | defsubr (&Sdo_auto_save); |
| 5842 | defsubr (&Sset_buffer_auto_saved); |
| 5843 | defsubr (&Sclear_buffer_auto_save_failure); |
| 5844 | defsubr (&Srecent_auto_save_p); |
| 5845 | |
| 5846 | defsubr (&Snext_read_file_uses_dialog_p); |
| 5847 | |
| 5848 | #ifdef HAVE_SYNC |
| 5849 | defsubr (&Sunix_sync); |
| 5850 | #endif |
| 5851 | } |