| 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
| 2 | * |
| 3 | * This library is free software; you can redistribute it and/or |
| 4 | * modify it under the terms of the GNU Lesser General Public License |
| 5 | * as published by the Free Software Foundation; either version 3 of |
| 6 | * the License, or (at your option) any later version. |
| 7 | * |
| 8 | * This library is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * Lesser General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU Lesser General Public |
| 14 | * License along with this library; if not, write to the Free Software |
| 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 16 | * 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | |
| 20 | \f |
| 21 | #define _LARGEFILE64_SOURCE /* ask for stat64 etc */ |
| 22 | |
| 23 | #ifdef HAVE_CONFIG_H |
| 24 | # include <config.h> |
| 25 | #endif |
| 26 | |
| 27 | #include <stdio.h> |
| 28 | #include <fcntl.h> |
| 29 | #include "libguile/_scm.h" |
| 30 | #include "libguile/strings.h" |
| 31 | #include "libguile/validate.h" |
| 32 | #include "libguile/gc.h" |
| 33 | #include "libguile/posix.h" |
| 34 | #include "libguile/dynwind.h" |
| 35 | #include "libguile/hashtab.h" |
| 36 | |
| 37 | #include "libguile/fports.h" |
| 38 | |
| 39 | #ifdef HAVE_STRING_H |
| 40 | #include <string.h> |
| 41 | #endif |
| 42 | #ifdef HAVE_UNISTD_H |
| 43 | #include <unistd.h> |
| 44 | #endif |
| 45 | #ifdef HAVE_IO_H |
| 46 | #include <io.h> |
| 47 | #endif |
| 48 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
| 49 | #include <sys/stat.h> |
| 50 | #endif |
| 51 | |
| 52 | #include <errno.h> |
| 53 | #include <sys/types.h> |
| 54 | |
| 55 | #include "libguile/iselect.h" |
| 56 | |
| 57 | /* Some defines for Windows (native port, not Cygwin). */ |
| 58 | #ifdef __MINGW32__ |
| 59 | # include <sys/stat.h> |
| 60 | # include <winsock2.h> |
| 61 | #endif /* __MINGW32__ */ |
| 62 | |
| 63 | #include <full-write.h> |
| 64 | |
| 65 | /* Mingw (version 3.4.5, circa 2006) has ftruncate as an alias for chsize |
| 66 | already, but have this code here in case that wasn't so in past versions, |
| 67 | or perhaps to help other minimal DOS environments. |
| 68 | |
| 69 | gnulib ftruncate.c has code using fcntl F_CHSIZE and F_FREESP, which |
| 70 | might be possibilities if we've got other systems without ftruncate. */ |
| 71 | |
| 72 | #if HAVE_CHSIZE && ! HAVE_FTRUNCATE |
| 73 | # define ftruncate(fd, size) chsize (fd, size) |
| 74 | #undef HAVE_FTRUNCATE |
| 75 | #define HAVE_FTRUNCATE 1 |
| 76 | #endif |
| 77 | |
| 78 | #if SIZEOF_OFF_T == SIZEOF_INT |
| 79 | #define OFF_T_MAX INT_MAX |
| 80 | #define OFF_T_MIN INT_MIN |
| 81 | #elif SIZEOF_OFF_T == SIZEOF_LONG |
| 82 | #define OFF_T_MAX LONG_MAX |
| 83 | #define OFF_T_MIN LONG_MIN |
| 84 | #elif SIZEOF_OFF_T == SIZEOF_LONG_LONG |
| 85 | #define OFF_T_MAX LONG_LONG_MAX |
| 86 | #define OFF_T_MIN LONG_LONG_MIN |
| 87 | #else |
| 88 | #error Oops, unknown OFF_T size |
| 89 | #endif |
| 90 | |
| 91 | scm_t_bits scm_tc16_fport; |
| 92 | |
| 93 | |
| 94 | /* default buffer size, used if the O/S won't supply a value. */ |
| 95 | static const size_t default_buffer_size = 1024; |
| 96 | |
| 97 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
| 98 | 0 for no buffer. */ |
| 99 | static void |
| 100 | scm_fport_buffer_add (SCM port, long read_size, int write_size) |
| 101 | #define FUNC_NAME "scm_fport_buffer_add" |
| 102 | { |
| 103 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 104 | |
| 105 | if (read_size == -1 || write_size == -1) |
| 106 | { |
| 107 | size_t default_size; |
| 108 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
| 109 | struct stat st; |
| 110 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 111 | |
| 112 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
| 113 | : st.st_blksize; |
| 114 | #else |
| 115 | default_size = default_buffer_size; |
| 116 | #endif |
| 117 | if (read_size == -1) |
| 118 | read_size = default_size; |
| 119 | if (write_size == -1) |
| 120 | write_size = default_size; |
| 121 | } |
| 122 | |
| 123 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
| 124 | { |
| 125 | pt->read_buf = scm_gc_malloc (read_size, "port buffer"); |
| 126 | pt->read_pos = pt->read_end = pt->read_buf; |
| 127 | pt->read_buf_size = read_size; |
| 128 | } |
| 129 | else |
| 130 | { |
| 131 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
| 132 | pt->read_buf_size = 1; |
| 133 | } |
| 134 | |
| 135 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
| 136 | { |
| 137 | pt->write_buf = scm_gc_malloc (write_size, "port buffer"); |
| 138 | pt->write_pos = pt->write_buf; |
| 139 | pt->write_buf_size = write_size; |
| 140 | } |
| 141 | else |
| 142 | { |
| 143 | pt->write_buf = pt->write_pos = &pt->shortbuf; |
| 144 | pt->write_buf_size = 1; |
| 145 | } |
| 146 | |
| 147 | pt->write_end = pt->write_buf + pt->write_buf_size; |
| 148 | if (read_size > 0 || write_size > 0) |
| 149 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
| 150 | else |
| 151 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
| 152 | } |
| 153 | #undef FUNC_NAME |
| 154 | |
| 155 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
| 156 | (SCM port, SCM mode, SCM size), |
| 157 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
| 158 | "@table @code\n" |
| 159 | "@item _IONBF\n" |
| 160 | "non-buffered\n" |
| 161 | "@item _IOLBF\n" |
| 162 | "line buffered\n" |
| 163 | "@item _IOFBF\n" |
| 164 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" |
| 165 | "If @var{size} is omitted, a default size will be used.\n" |
| 166 | "@end table") |
| 167 | #define FUNC_NAME s_scm_setvbuf |
| 168 | { |
| 169 | int cmode; |
| 170 | long csize; |
| 171 | scm_t_port *pt; |
| 172 | |
| 173 | port = SCM_COERCE_OUTPORT (port); |
| 174 | |
| 175 | SCM_VALIDATE_OPFPORT (1,port); |
| 176 | cmode = scm_to_int (mode); |
| 177 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
| 178 | scm_out_of_range (FUNC_NAME, mode); |
| 179 | |
| 180 | if (cmode == _IOLBF) |
| 181 | { |
| 182 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
| 183 | cmode = _IOFBF; |
| 184 | } |
| 185 | else |
| 186 | { |
| 187 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~(scm_t_bits)SCM_BUFLINE); |
| 188 | } |
| 189 | |
| 190 | if (SCM_UNBNDP (size)) |
| 191 | { |
| 192 | if (cmode == _IOFBF) |
| 193 | csize = -1; |
| 194 | else |
| 195 | csize = 0; |
| 196 | } |
| 197 | else |
| 198 | { |
| 199 | csize = scm_to_int (size); |
| 200 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
| 201 | scm_out_of_range (FUNC_NAME, size); |
| 202 | } |
| 203 | |
| 204 | pt = SCM_PTAB_ENTRY (port); |
| 205 | |
| 206 | /* silently discards buffered and put-back chars. */ |
| 207 | if (pt->read_buf == pt->putback_buf) |
| 208 | { |
| 209 | pt->read_buf = pt->saved_read_buf; |
| 210 | pt->read_pos = pt->saved_read_pos; |
| 211 | pt->read_end = pt->saved_read_end; |
| 212 | pt->read_buf_size = pt->saved_read_buf_size; |
| 213 | } |
| 214 | if (pt->read_buf != &pt->shortbuf) |
| 215 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
| 216 | if (pt->write_buf != &pt->shortbuf) |
| 217 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
| 218 | |
| 219 | scm_fport_buffer_add (port, csize, csize); |
| 220 | return SCM_UNSPECIFIED; |
| 221 | } |
| 222 | #undef FUNC_NAME |
| 223 | |
| 224 | /* Move ports with the specified file descriptor to new descriptors, |
| 225 | * resetting the revealed count to 0. |
| 226 | */ |
| 227 | static void |
| 228 | scm_i_evict_port (void *closure, SCM port) |
| 229 | { |
| 230 | int fd = * (int*) closure; |
| 231 | |
| 232 | if (SCM_FPORTP (port)) |
| 233 | { |
| 234 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 235 | |
| 236 | if (fp->fdes == fd) |
| 237 | { |
| 238 | fp->fdes = dup (fd); |
| 239 | if (fp->fdes == -1) |
| 240 | scm_syserror ("scm_evict_ports"); |
| 241 | scm_set_port_revealed_x (port, scm_from_int (0)); |
| 242 | } |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | void |
| 247 | scm_evict_ports (int fd) |
| 248 | { |
| 249 | scm_c_port_for_each (scm_i_evict_port, (void *) &fd); |
| 250 | } |
| 251 | |
| 252 | |
| 253 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, |
| 254 | (SCM obj), |
| 255 | "Determine whether @var{obj} is a port that is related to a file.") |
| 256 | #define FUNC_NAME s_scm_file_port_p |
| 257 | { |
| 258 | return scm_from_bool (SCM_FPORTP (obj)); |
| 259 | } |
| 260 | #undef FUNC_NAME |
| 261 | |
| 262 | |
| 263 | /* scm_open_file |
| 264 | * Return a new port open on a given file. |
| 265 | * |
| 266 | * The mode string must match the pattern: [rwa+]** which |
| 267 | * is interpreted in the usual unix way. |
| 268 | * |
| 269 | * Return the new port. |
| 270 | */ |
| 271 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
| 272 | (SCM filename, SCM mode), |
| 273 | "Open the file whose name is @var{filename}, and return a port\n" |
| 274 | "representing that file. The attributes of the port are\n" |
| 275 | "determined by the @var{mode} string. The way in which this is\n" |
| 276 | "interpreted is similar to C stdio. The first character must be\n" |
| 277 | "one of the following:\n" |
| 278 | "@table @samp\n" |
| 279 | "@item r\n" |
| 280 | "Open an existing file for input.\n" |
| 281 | "@item w\n" |
| 282 | "Open a file for output, creating it if it doesn't already exist\n" |
| 283 | "or removing its contents if it does.\n" |
| 284 | "@item a\n" |
| 285 | "Open a file for output, creating it if it doesn't already\n" |
| 286 | "exist. All writes to the port will go to the end of the file.\n" |
| 287 | "The \"append mode\" can be turned off while the port is in use\n" |
| 288 | "@pxref{Ports and File Descriptors, fcntl}\n" |
| 289 | "@end table\n" |
| 290 | "The following additional characters can be appended:\n" |
| 291 | "@table @samp\n" |
| 292 | "@item b\n" |
| 293 | "Open the underlying file in binary mode, if supported by the operating system. " |
| 294 | "@item +\n" |
| 295 | "Open the port for both input and output. E.g., @code{r+}: open\n" |
| 296 | "an existing file for both input and output.\n" |
| 297 | "@item 0\n" |
| 298 | "Create an \"unbuffered\" port. In this case input and output\n" |
| 299 | "operations are passed directly to the underlying port\n" |
| 300 | "implementation without additional buffering. This is likely to\n" |
| 301 | "slow down I/O operations. The buffering mode can be changed\n" |
| 302 | "while a port is in use @pxref{Ports and File Descriptors,\n" |
| 303 | "setvbuf}\n" |
| 304 | "@item l\n" |
| 305 | "Add line-buffering to the port. The port output buffer will be\n" |
| 306 | "automatically flushed whenever a newline character is written.\n" |
| 307 | "@end table\n" |
| 308 | "In theory we could create read/write ports which were buffered\n" |
| 309 | "in one direction only. However this isn't included in the\n" |
| 310 | "current interfaces. If a file cannot be opened with the access\n" |
| 311 | "requested, @code{open-file} throws an exception.") |
| 312 | #define FUNC_NAME s_scm_open_file |
| 313 | { |
| 314 | SCM port; |
| 315 | int fdes; |
| 316 | int flags = 0; |
| 317 | char *file; |
| 318 | char *md; |
| 319 | char *ptr; |
| 320 | |
| 321 | scm_dynwind_begin (0); |
| 322 | |
| 323 | file = scm_to_locale_string (filename); |
| 324 | scm_dynwind_free (file); |
| 325 | |
| 326 | md = scm_to_locale_string (mode); |
| 327 | scm_dynwind_free (md); |
| 328 | |
| 329 | switch (*md) |
| 330 | { |
| 331 | case 'r': |
| 332 | flags |= O_RDONLY; |
| 333 | break; |
| 334 | case 'w': |
| 335 | flags |= O_WRONLY | O_CREAT | O_TRUNC; |
| 336 | break; |
| 337 | case 'a': |
| 338 | flags |= O_WRONLY | O_CREAT | O_APPEND; |
| 339 | break; |
| 340 | default: |
| 341 | scm_out_of_range (FUNC_NAME, mode); |
| 342 | } |
| 343 | ptr = md + 1; |
| 344 | while (*ptr != '\0') |
| 345 | { |
| 346 | switch (*ptr) |
| 347 | { |
| 348 | case '+': |
| 349 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; |
| 350 | break; |
| 351 | case 'b': |
| 352 | #if defined (O_BINARY) |
| 353 | flags |= O_BINARY; |
| 354 | #endif |
| 355 | break; |
| 356 | case '0': /* unbuffered: handled later. */ |
| 357 | case 'l': /* line buffered: handled during output. */ |
| 358 | break; |
| 359 | default: |
| 360 | scm_out_of_range (FUNC_NAME, mode); |
| 361 | } |
| 362 | ptr++; |
| 363 | } |
| 364 | SCM_SYSCALL (fdes = open_or_open64 (file, flags, 0666)); |
| 365 | if (fdes == -1) |
| 366 | { |
| 367 | int en = errno; |
| 368 | |
| 369 | SCM_SYSERROR_MSG ("~A: ~S", |
| 370 | scm_cons (scm_strerror (scm_from_int (en)), |
| 371 | scm_cons (filename, SCM_EOL)), en); |
| 372 | } |
| 373 | port = scm_i_fdes_to_port (fdes, scm_i_mode_bits (mode), filename); |
| 374 | |
| 375 | scm_dynwind_end (); |
| 376 | |
| 377 | return port; |
| 378 | } |
| 379 | #undef FUNC_NAME |
| 380 | |
| 381 | \f |
| 382 | #ifdef __MINGW32__ |
| 383 | /* |
| 384 | * Try getting the appropiate file flags for a given file descriptor |
| 385 | * under Windows. This incorporates some fancy operations because Windows |
| 386 | * differentiates between file, pipe and socket descriptors. |
| 387 | */ |
| 388 | #ifndef O_ACCMODE |
| 389 | # define O_ACCMODE 0x0003 |
| 390 | #endif |
| 391 | |
| 392 | static int getflags (int fdes) |
| 393 | { |
| 394 | int flags = 0; |
| 395 | struct stat buf; |
| 396 | int error, optlen = sizeof (int); |
| 397 | |
| 398 | /* Is this a socket ? */ |
| 399 | if (getsockopt (fdes, SOL_SOCKET, SO_ERROR, (void *) &error, &optlen) >= 0) |
| 400 | flags = O_RDWR; |
| 401 | /* Maybe a regular file ? */ |
| 402 | else if (fstat (fdes, &buf) < 0) |
| 403 | flags = -1; |
| 404 | else |
| 405 | { |
| 406 | /* Or an anonymous pipe handle ? */ |
| 407 | if (buf.st_mode & _S_IFIFO) |
| 408 | flags = PeekNamedPipe ((HANDLE) _get_osfhandle (fdes), NULL, 0, |
| 409 | NULL, NULL, NULL) ? O_RDONLY : O_WRONLY; |
| 410 | /* stdin ? */ |
| 411 | else if (fdes == fileno (stdin) && isatty (fdes)) |
| 412 | flags = O_RDONLY; |
| 413 | /* stdout / stderr ? */ |
| 414 | else if ((fdes == fileno (stdout) || fdes == fileno (stderr)) && |
| 415 | isatty (fdes)) |
| 416 | flags = O_WRONLY; |
| 417 | else |
| 418 | flags = buf.st_mode; |
| 419 | } |
| 420 | return flags; |
| 421 | } |
| 422 | #endif /* __MINGW32__ */ |
| 423 | |
| 424 | /* Building Guile ports from a file descriptor. */ |
| 425 | |
| 426 | /* Build a Scheme port from an open file descriptor `fdes'. |
| 427 | MODE indicates whether FILE is open for reading or writing; it uses |
| 428 | the same notation as open-file's second argument. |
| 429 | NAME is a string to be used as the port's filename. |
| 430 | */ |
| 431 | SCM |
| 432 | scm_i_fdes_to_port (int fdes, long mode_bits, SCM name) |
| 433 | #define FUNC_NAME "scm_fdes_to_port" |
| 434 | { |
| 435 | SCM port; |
| 436 | scm_t_port *pt; |
| 437 | int flags; |
| 438 | |
| 439 | /* test that fdes is valid. */ |
| 440 | #ifdef __MINGW32__ |
| 441 | flags = getflags (fdes); |
| 442 | #else |
| 443 | flags = fcntl (fdes, F_GETFL, 0); |
| 444 | #endif |
| 445 | if (flags == -1) |
| 446 | SCM_SYSERROR; |
| 447 | flags &= O_ACCMODE; |
| 448 | if (flags != O_RDWR |
| 449 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) |
| 450 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) |
| 451 | { |
| 452 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); |
| 453 | } |
| 454 | |
| 455 | scm_i_scm_pthread_mutex_lock (&scm_i_port_table_mutex); |
| 456 | |
| 457 | port = scm_new_port_table_entry (scm_tc16_fport); |
| 458 | SCM_SET_CELL_TYPE(port, scm_tc16_fport | mode_bits); |
| 459 | pt = SCM_PTAB_ENTRY(port); |
| 460 | { |
| 461 | scm_t_fport *fp |
| 462 | = (scm_t_fport *) scm_gc_malloc (sizeof (scm_t_fport), "file port"); |
| 463 | |
| 464 | fp->fdes = fdes; |
| 465 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
| 466 | SCM_SETSTREAM (port, fp); |
| 467 | if (mode_bits & SCM_BUF0) |
| 468 | scm_fport_buffer_add (port, 0, 0); |
| 469 | else |
| 470 | scm_fport_buffer_add (port, -1, -1); |
| 471 | } |
| 472 | SCM_SET_FILENAME (port, name); |
| 473 | scm_i_pthread_mutex_unlock (&scm_i_port_table_mutex); |
| 474 | return port; |
| 475 | } |
| 476 | #undef FUNC_NAME |
| 477 | |
| 478 | SCM |
| 479 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
| 480 | { |
| 481 | return scm_i_fdes_to_port (fdes, scm_mode_bits (mode), name); |
| 482 | } |
| 483 | |
| 484 | /* Return a lower bound on the number of bytes available for input. */ |
| 485 | static int |
| 486 | fport_input_waiting (SCM port) |
| 487 | { |
| 488 | #ifdef HAVE_SELECT |
| 489 | int fdes = SCM_FSTREAM (port)->fdes; |
| 490 | struct timeval timeout; |
| 491 | SELECT_TYPE read_set; |
| 492 | SELECT_TYPE write_set; |
| 493 | SELECT_TYPE except_set; |
| 494 | |
| 495 | FD_ZERO (&read_set); |
| 496 | FD_ZERO (&write_set); |
| 497 | FD_ZERO (&except_set); |
| 498 | |
| 499 | FD_SET (fdes, &read_set); |
| 500 | |
| 501 | timeout.tv_sec = 0; |
| 502 | timeout.tv_usec = 0; |
| 503 | |
| 504 | if (select (SELECT_SET_SIZE, |
| 505 | &read_set, &write_set, &except_set, &timeout) |
| 506 | < 0) |
| 507 | scm_syserror ("fport_input_waiting"); |
| 508 | return FD_ISSET (fdes, &read_set) ? 1 : 0; |
| 509 | |
| 510 | #elif HAVE_IOCTL && defined (FIONREAD) |
| 511 | /* Note: cannot test just defined(FIONREAD) here, since mingw has FIONREAD |
| 512 | (for use with winsock ioctlsocket()) but not ioctl(). */ |
| 513 | int fdes = SCM_FSTREAM (port)->fdes; |
| 514 | int remir; |
| 515 | ioctl(fdes, FIONREAD, &remir); |
| 516 | return remir; |
| 517 | |
| 518 | #else |
| 519 | scm_misc_error ("fport_input_waiting", |
| 520 | "Not fully implemented on this platform", |
| 521 | SCM_EOL); |
| 522 | #endif |
| 523 | } |
| 524 | |
| 525 | \f |
| 526 | static int |
| 527 | fport_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
| 528 | { |
| 529 | scm_puts ("#<", port); |
| 530 | scm_print_port_mode (exp, port); |
| 531 | if (SCM_OPFPORTP (exp)) |
| 532 | { |
| 533 | int fdes; |
| 534 | SCM name = SCM_FILENAME (exp); |
| 535 | if (scm_is_string (name) || scm_is_symbol (name)) |
| 536 | scm_display (name, port); |
| 537 | else |
| 538 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
| 539 | scm_putc (' ', port); |
| 540 | fdes = (SCM_FSTREAM (exp))->fdes; |
| 541 | |
| 542 | #ifdef HAVE_TTYNAME |
| 543 | if (isatty (fdes)) |
| 544 | scm_display (scm_ttyname (exp), port); |
| 545 | else |
| 546 | #endif /* HAVE_TTYNAME */ |
| 547 | scm_intprint (fdes, 10, port); |
| 548 | } |
| 549 | else |
| 550 | { |
| 551 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
| 552 | scm_putc (' ', port); |
| 553 | scm_uintprint ((scm_t_bits) SCM_PTAB_ENTRY (exp), 16, port); |
| 554 | } |
| 555 | scm_putc ('>', port); |
| 556 | return 1; |
| 557 | } |
| 558 | |
| 559 | #ifndef __MINGW32__ |
| 560 | /* thread-local block for input on fport's fdes. */ |
| 561 | static void |
| 562 | fport_wait_for_input (SCM port) |
| 563 | { |
| 564 | int fdes = SCM_FSTREAM (port)->fdes; |
| 565 | |
| 566 | if (!fport_input_waiting (port)) |
| 567 | { |
| 568 | int n; |
| 569 | SELECT_TYPE readfds; |
| 570 | int flags = fcntl (fdes, F_GETFL); |
| 571 | |
| 572 | if (flags == -1) |
| 573 | scm_syserror ("scm_fdes_wait_for_input"); |
| 574 | if (!(flags & O_NONBLOCK)) |
| 575 | do |
| 576 | { |
| 577 | FD_ZERO (&readfds); |
| 578 | FD_SET (fdes, &readfds); |
| 579 | n = scm_std_select (fdes + 1, &readfds, NULL, NULL, NULL); |
| 580 | } |
| 581 | while (n == -1 && errno == EINTR); |
| 582 | } |
| 583 | } |
| 584 | #endif /* !__MINGW32__ */ |
| 585 | |
| 586 | static void fport_flush (SCM port); |
| 587 | |
| 588 | /* fill a port's read-buffer with a single read. returns the first |
| 589 | char or EOF if end of file. */ |
| 590 | static scm_t_wchar |
| 591 | fport_fill_input (SCM port) |
| 592 | { |
| 593 | long count; |
| 594 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 595 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 596 | |
| 597 | #ifndef __MINGW32__ |
| 598 | fport_wait_for_input (port); |
| 599 | #endif /* !__MINGW32__ */ |
| 600 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); |
| 601 | if (count == -1) |
| 602 | scm_syserror ("fport_fill_input"); |
| 603 | if (count == 0) |
| 604 | return (scm_t_wchar) EOF; |
| 605 | else |
| 606 | { |
| 607 | pt->read_pos = pt->read_buf; |
| 608 | pt->read_end = pt->read_buf + count; |
| 609 | return *pt->read_buf; |
| 610 | } |
| 611 | } |
| 612 | |
| 613 | static scm_t_off |
| 614 | fport_seek (SCM port, scm_t_off offset, int whence) |
| 615 | { |
| 616 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 617 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 618 | off_t_or_off64_t rv; |
| 619 | off_t_or_off64_t result; |
| 620 | |
| 621 | if (pt->rw_active == SCM_PORT_WRITE) |
| 622 | { |
| 623 | if (offset != 0 || whence != SEEK_CUR) |
| 624 | { |
| 625 | fport_flush (port); |
| 626 | result = rv = lseek_or_lseek64 (fp->fdes, offset, whence); |
| 627 | } |
| 628 | else |
| 629 | { |
| 630 | /* read current position without disturbing the buffer. */ |
| 631 | rv = lseek_or_lseek64 (fp->fdes, offset, whence); |
| 632 | result = rv + (pt->write_pos - pt->write_buf); |
| 633 | } |
| 634 | } |
| 635 | else if (pt->rw_active == SCM_PORT_READ) |
| 636 | { |
| 637 | if (offset != 0 || whence != SEEK_CUR) |
| 638 | { |
| 639 | /* could expand to avoid a second seek. */ |
| 640 | scm_end_input (port); |
| 641 | result = rv = lseek_or_lseek64 (fp->fdes, offset, whence); |
| 642 | } |
| 643 | else |
| 644 | { |
| 645 | /* read current position without disturbing the buffer |
| 646 | (particularly the unread-char buffer). */ |
| 647 | rv = lseek_or_lseek64 (fp->fdes, offset, whence); |
| 648 | result = rv - (pt->read_end - pt->read_pos); |
| 649 | |
| 650 | if (pt->read_buf == pt->putback_buf) |
| 651 | result -= pt->saved_read_end - pt->saved_read_pos; |
| 652 | } |
| 653 | } |
| 654 | else /* SCM_PORT_NEITHER */ |
| 655 | { |
| 656 | result = rv = lseek_or_lseek64 (fp->fdes, offset, whence); |
| 657 | } |
| 658 | |
| 659 | if (rv == -1) |
| 660 | scm_syserror ("fport_seek"); |
| 661 | |
| 662 | return result; |
| 663 | } |
| 664 | |
| 665 | static void |
| 666 | fport_truncate (SCM port, scm_t_off length) |
| 667 | { |
| 668 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 669 | |
| 670 | if (ftruncate (fp->fdes, length) == -1) |
| 671 | scm_syserror ("ftruncate"); |
| 672 | } |
| 673 | |
| 674 | /* helper for fport_write: try to write data, using multiple system |
| 675 | calls if required. */ |
| 676 | #define FUNC_NAME "write_all" |
| 677 | static void write_all (SCM port, const void *data, size_t remaining) |
| 678 | { |
| 679 | int fdes = SCM_FSTREAM (port)->fdes; |
| 680 | |
| 681 | while (remaining > 0) |
| 682 | { |
| 683 | size_t done; |
| 684 | |
| 685 | SCM_SYSCALL (done = write (fdes, data, remaining)); |
| 686 | |
| 687 | if (done == -1) |
| 688 | SCM_SYSERROR; |
| 689 | remaining -= done; |
| 690 | data = ((const char *) data) + done; |
| 691 | } |
| 692 | } |
| 693 | #undef FUNC_NAME |
| 694 | |
| 695 | static void |
| 696 | fport_write (SCM port, const void *data, size_t size) |
| 697 | { |
| 698 | /* this procedure tries to minimize the number of writes/flushes. */ |
| 699 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 700 | |
| 701 | if (pt->write_buf == &pt->shortbuf |
| 702 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) |
| 703 | { |
| 704 | /* "unbuffered" port, or |
| 705 | port with empty buffer and data won't fit in buffer. */ |
| 706 | write_all (port, data, size); |
| 707 | return; |
| 708 | } |
| 709 | |
| 710 | { |
| 711 | scm_t_off space = pt->write_end - pt->write_pos; |
| 712 | |
| 713 | if (size <= space) |
| 714 | { |
| 715 | /* data fits in buffer. */ |
| 716 | memcpy (pt->write_pos, data, size); |
| 717 | pt->write_pos += size; |
| 718 | if (pt->write_pos == pt->write_end) |
| 719 | { |
| 720 | fport_flush (port); |
| 721 | /* we can skip the line-buffering check if nothing's buffered. */ |
| 722 | return; |
| 723 | } |
| 724 | } |
| 725 | else |
| 726 | { |
| 727 | memcpy (pt->write_pos, data, space); |
| 728 | pt->write_pos = pt->write_end; |
| 729 | fport_flush (port); |
| 730 | { |
| 731 | const void *ptr = ((const char *) data) + space; |
| 732 | size_t remaining = size - space; |
| 733 | |
| 734 | if (size >= pt->write_buf_size) |
| 735 | { |
| 736 | write_all (port, ptr, remaining); |
| 737 | return; |
| 738 | } |
| 739 | else |
| 740 | { |
| 741 | memcpy (pt->write_pos, ptr, remaining); |
| 742 | pt->write_pos += remaining; |
| 743 | } |
| 744 | } |
| 745 | } |
| 746 | |
| 747 | /* handle line buffering. */ |
| 748 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) |
| 749 | fport_flush (port); |
| 750 | } |
| 751 | } |
| 752 | |
| 753 | /* becomes 1 when process is exiting: normal exception handling won't |
| 754 | work by this time. */ |
| 755 | extern int scm_i_terminating; |
| 756 | |
| 757 | static void |
| 758 | fport_flush (SCM port) |
| 759 | { |
| 760 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 761 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 762 | unsigned char *ptr = pt->write_buf; |
| 763 | long init_size = pt->write_pos - pt->write_buf; |
| 764 | long remaining = init_size; |
| 765 | |
| 766 | while (remaining > 0) |
| 767 | { |
| 768 | long count; |
| 769 | |
| 770 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); |
| 771 | if (count < 0) |
| 772 | { |
| 773 | /* error. assume nothing was written this call, but |
| 774 | fix up the buffer for any previous successful writes. */ |
| 775 | long done = init_size - remaining; |
| 776 | |
| 777 | if (done > 0) |
| 778 | { |
| 779 | int i; |
| 780 | |
| 781 | for (i = 0; i < remaining; i++) |
| 782 | { |
| 783 | *(pt->write_buf + i) = *(pt->write_buf + done + i); |
| 784 | } |
| 785 | pt->write_pos = pt->write_buf + remaining; |
| 786 | } |
| 787 | if (scm_i_terminating) |
| 788 | { |
| 789 | const char *msg = "Error: could not flush file-descriptor "; |
| 790 | char buf[11]; |
| 791 | |
| 792 | full_write (2, msg, strlen (msg)); |
| 793 | sprintf (buf, "%d\n", fp->fdes); |
| 794 | full_write (2, buf, strlen (buf)); |
| 795 | |
| 796 | count = remaining; |
| 797 | } |
| 798 | else if (scm_gc_running_p) |
| 799 | { |
| 800 | /* silently ignore the error. scm_error would abort if we |
| 801 | called it now. */ |
| 802 | count = remaining; |
| 803 | } |
| 804 | else |
| 805 | scm_syserror ("fport_flush"); |
| 806 | } |
| 807 | ptr += count; |
| 808 | remaining -= count; |
| 809 | } |
| 810 | pt->write_pos = pt->write_buf; |
| 811 | pt->rw_active = SCM_PORT_NEITHER; |
| 812 | } |
| 813 | |
| 814 | /* clear the read buffer and adjust the file position for unread bytes. */ |
| 815 | static void |
| 816 | fport_end_input (SCM port, int offset) |
| 817 | { |
| 818 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 819 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 820 | |
| 821 | offset += pt->read_end - pt->read_pos; |
| 822 | |
| 823 | if (offset > 0) |
| 824 | { |
| 825 | pt->read_pos = pt->read_end; |
| 826 | /* will throw error if unread-char used at beginning of file |
| 827 | then attempting to write. seems correct. */ |
| 828 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) |
| 829 | scm_syserror ("fport_end_input"); |
| 830 | } |
| 831 | pt->rw_active = SCM_PORT_NEITHER; |
| 832 | } |
| 833 | |
| 834 | static int |
| 835 | fport_close (SCM port) |
| 836 | { |
| 837 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 838 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 839 | int rv; |
| 840 | |
| 841 | fport_flush (port); |
| 842 | SCM_SYSCALL (rv = close (fp->fdes)); |
| 843 | if (rv == -1 && errno != EBADF) |
| 844 | { |
| 845 | if (scm_gc_running_p) |
| 846 | /* silently ignore the error. scm_error would abort if we |
| 847 | called it now. */ |
| 848 | ; |
| 849 | else |
| 850 | scm_syserror ("fport_close"); |
| 851 | } |
| 852 | if (pt->read_buf == pt->putback_buf) |
| 853 | pt->read_buf = pt->saved_read_buf; |
| 854 | if (pt->read_buf != &pt->shortbuf) |
| 855 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
| 856 | if (pt->write_buf != &pt->shortbuf) |
| 857 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
| 858 | scm_gc_free (fp, sizeof (*fp), "file port"); |
| 859 | return rv; |
| 860 | } |
| 861 | |
| 862 | static size_t |
| 863 | fport_free (SCM port) |
| 864 | { |
| 865 | fport_close (port); |
| 866 | return 0; |
| 867 | } |
| 868 | |
| 869 | static scm_t_bits |
| 870 | scm_make_fptob () |
| 871 | { |
| 872 | scm_t_bits tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
| 873 | |
| 874 | scm_set_port_free (tc, fport_free); |
| 875 | scm_set_port_print (tc, fport_print); |
| 876 | scm_set_port_flush (tc, fport_flush); |
| 877 | scm_set_port_end_input (tc, fport_end_input); |
| 878 | scm_set_port_close (tc, fport_close); |
| 879 | scm_set_port_seek (tc, fport_seek); |
| 880 | scm_set_port_truncate (tc, fport_truncate); |
| 881 | scm_set_port_input_waiting (tc, fport_input_waiting); |
| 882 | |
| 883 | return tc; |
| 884 | } |
| 885 | |
| 886 | void |
| 887 | scm_init_fports () |
| 888 | { |
| 889 | scm_tc16_fport = scm_make_fptob (); |
| 890 | |
| 891 | scm_c_define ("_IOFBF", scm_from_int (_IOFBF)); |
| 892 | scm_c_define ("_IOLBF", scm_from_int (_IOLBF)); |
| 893 | scm_c_define ("_IONBF", scm_from_int (_IONBF)); |
| 894 | |
| 895 | #include "libguile/fports.x" |
| 896 | } |
| 897 | |
| 898 | /* |
| 899 | Local Variables: |
| 900 | c-file-style: "gnu" |
| 901 | End: |
| 902 | */ |