| 1 | /* Copyright (C) 1995,1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License as published by |
| 5 | * the Free Software Foundation; either version 2, or (at your option) |
| 6 | * any later version. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this software; see the file COPYING. If not, write to |
| 15 | * the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
| 16 | * Boston, MA 02111-1307 USA |
| 17 | * |
| 18 | * As a special exception, the Free Software Foundation gives permission |
| 19 | * for additional uses of the text contained in its release of GUILE. |
| 20 | * |
| 21 | * The exception is that, if you link the GUILE library with other files |
| 22 | * to produce an executable, this does not by itself cause the |
| 23 | * resulting executable to be covered by the GNU General Public License. |
| 24 | * Your use of that executable is in no way restricted on account of |
| 25 | * linking the GUILE library code into it. |
| 26 | * |
| 27 | * This exception does not however invalidate any other reasons why |
| 28 | * the executable file might be covered by the GNU General Public License. |
| 29 | * |
| 30 | * This exception applies only to the code released by the |
| 31 | * Free Software Foundation under the name GUILE. If you copy |
| 32 | * code from other Free Software Foundation releases into a copy of |
| 33 | * GUILE, as the General Public License permits, the exception does |
| 34 | * not apply to the code that you add in this way. To avoid misleading |
| 35 | * anyone as to the status of such modified files, you must delete |
| 36 | * this exception notice from them. |
| 37 | * |
| 38 | * If you write modifications of your own for GUILE, it is your choice |
| 39 | * whether to permit this exception to apply to your modifications. |
| 40 | * If you do not wish that, delete this exception notice. */ |
| 41 | |
| 42 | |
| 43 | \f |
| 44 | |
| 45 | #include <stdio.h> |
| 46 | #include <fcntl.h> |
| 47 | #include "libguile/_scm.h" |
| 48 | #include "libguile/strings.h" |
| 49 | #include "libguile/validate.h" |
| 50 | #include "libguile/gc.h" |
| 51 | |
| 52 | #include "libguile/fports.h" |
| 53 | |
| 54 | #ifdef HAVE_STRING_H |
| 55 | #include <string.h> |
| 56 | #endif |
| 57 | #ifdef HAVE_UNISTD_H |
| 58 | #include <unistd.h> |
| 59 | #else |
| 60 | size_t fwrite (); |
| 61 | #endif |
| 62 | #ifdef HAVE_IO_H |
| 63 | #include <io.h> |
| 64 | #endif |
| 65 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
| 66 | #include <sys/stat.h> |
| 67 | #endif |
| 68 | |
| 69 | #include <errno.h> |
| 70 | |
| 71 | #include "libguile/iselect.h" |
| 72 | |
| 73 | /* Some defines for Windows (native port, not Cygwin). */ |
| 74 | #ifdef __MINGW32__ |
| 75 | # include <sys/stat.h> |
| 76 | # include <winsock2.h> |
| 77 | # define ftruncate(fd, size) chsize (fd, size) |
| 78 | #endif /* __MINGW32__ */ |
| 79 | |
| 80 | |
| 81 | scm_t_bits scm_tc16_fport; |
| 82 | |
| 83 | |
| 84 | /* default buffer size, used if the O/S won't supply a value. */ |
| 85 | static const size_t default_buffer_size = 1024; |
| 86 | |
| 87 | /* create FPORT buffer with specified sizes (or -1 to use default size or |
| 88 | 0 for no buffer. */ |
| 89 | static void |
| 90 | scm_fport_buffer_add (SCM port, long read_size, int write_size) |
| 91 | #define FUNC_NAME "scm_fport_buffer_add" |
| 92 | { |
| 93 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 94 | |
| 95 | if (read_size == -1 || write_size == -1) |
| 96 | { |
| 97 | size_t default_size; |
| 98 | #ifdef HAVE_STRUCT_STAT_ST_BLKSIZE |
| 99 | struct stat st; |
| 100 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 101 | |
| 102 | default_size = (fstat (fp->fdes, &st) == -1) ? default_buffer_size |
| 103 | : st.st_blksize; |
| 104 | #else |
| 105 | default_size = default_buffer_size; |
| 106 | #endif |
| 107 | if (read_size == -1) |
| 108 | read_size = default_size; |
| 109 | if (write_size == -1) |
| 110 | write_size = default_size; |
| 111 | } |
| 112 | |
| 113 | if (SCM_INPUT_PORT_P (port) && read_size > 0) |
| 114 | { |
| 115 | pt->read_buf = scm_gc_malloc (read_size, "port buffer"); |
| 116 | pt->read_pos = pt->read_end = pt->read_buf; |
| 117 | pt->read_buf_size = read_size; |
| 118 | } |
| 119 | else |
| 120 | { |
| 121 | pt->read_pos = pt->read_buf = pt->read_end = &pt->shortbuf; |
| 122 | pt->read_buf_size = 1; |
| 123 | } |
| 124 | |
| 125 | if (SCM_OUTPUT_PORT_P (port) && write_size > 0) |
| 126 | { |
| 127 | pt->write_buf = scm_gc_malloc (write_size, "port buffer"); |
| 128 | pt->write_pos = pt->write_buf; |
| 129 | pt->write_buf_size = write_size; |
| 130 | } |
| 131 | else |
| 132 | { |
| 133 | pt->write_buf = pt->write_pos = &pt->shortbuf; |
| 134 | pt->write_buf_size = 1; |
| 135 | } |
| 136 | |
| 137 | pt->write_end = pt->write_buf + pt->write_buf_size; |
| 138 | if (read_size > 0 || write_size > 0) |
| 139 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) & ~SCM_BUF0); |
| 140 | else |
| 141 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUF0); |
| 142 | } |
| 143 | #undef FUNC_NAME |
| 144 | |
| 145 | SCM_DEFINE (scm_setvbuf, "setvbuf", 2, 1, 0, |
| 146 | (SCM port, SCM mode, SCM size), |
| 147 | "Set the buffering mode for @var{port}. @var{mode} can be:\n" |
| 148 | "@table @code\n" |
| 149 | "@item _IONBF\n" |
| 150 | "non-buffered\n" |
| 151 | "@item _IOLBF\n" |
| 152 | "line buffered\n" |
| 153 | "@item _IOFBF\n" |
| 154 | "block buffered, using a newly allocated buffer of @var{size} bytes.\n" |
| 155 | "If @var{size} is omitted, a default size will be used.\n" |
| 156 | "@end table") |
| 157 | #define FUNC_NAME s_scm_setvbuf |
| 158 | { |
| 159 | int cmode; |
| 160 | long csize; |
| 161 | scm_t_port *pt; |
| 162 | |
| 163 | port = SCM_COERCE_OUTPORT (port); |
| 164 | |
| 165 | SCM_VALIDATE_OPFPORT (1,port); |
| 166 | SCM_VALIDATE_INUM_COPY (2,mode,cmode); |
| 167 | if (cmode != _IONBF && cmode != _IOFBF && cmode != _IOLBF) |
| 168 | scm_out_of_range (FUNC_NAME, mode); |
| 169 | |
| 170 | if (cmode == _IOLBF) |
| 171 | { |
| 172 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) | SCM_BUFLINE); |
| 173 | cmode = _IOFBF; |
| 174 | } |
| 175 | else |
| 176 | { |
| 177 | SCM_SET_CELL_WORD_0 (port, SCM_CELL_WORD_0 (port) ^ SCM_BUFLINE); |
| 178 | } |
| 179 | |
| 180 | if (SCM_UNBNDP (size)) |
| 181 | { |
| 182 | if (cmode == _IOFBF) |
| 183 | csize = -1; |
| 184 | else |
| 185 | csize = 0; |
| 186 | } |
| 187 | else |
| 188 | { |
| 189 | SCM_VALIDATE_INUM_COPY (3,size,csize); |
| 190 | if (csize < 0 || (cmode == _IONBF && csize > 0)) |
| 191 | scm_out_of_range (FUNC_NAME, size); |
| 192 | } |
| 193 | |
| 194 | pt = SCM_PTAB_ENTRY (port); |
| 195 | |
| 196 | /* silently discards buffered and put-back chars. */ |
| 197 | if (pt->read_buf == pt->putback_buf) |
| 198 | { |
| 199 | pt->read_buf = pt->saved_read_buf; |
| 200 | pt->read_pos = pt->saved_read_pos; |
| 201 | pt->read_end = pt->saved_read_end; |
| 202 | pt->read_buf_size = pt->saved_read_buf_size; |
| 203 | } |
| 204 | if (pt->read_buf != &pt->shortbuf) |
| 205 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
| 206 | if (pt->write_buf != &pt->shortbuf) |
| 207 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
| 208 | |
| 209 | scm_fport_buffer_add (port, csize, csize); |
| 210 | return SCM_UNSPECIFIED; |
| 211 | } |
| 212 | #undef FUNC_NAME |
| 213 | |
| 214 | /* Move ports with the specified file descriptor to new descriptors, |
| 215 | * reseting the revealed count to 0. |
| 216 | */ |
| 217 | |
| 218 | void |
| 219 | scm_evict_ports (int fd) |
| 220 | { |
| 221 | long i; |
| 222 | |
| 223 | for (i = 0; i < scm_port_table_size; i++) |
| 224 | { |
| 225 | SCM port = scm_port_table[i]->port; |
| 226 | |
| 227 | if (SCM_FPORTP (port)) |
| 228 | { |
| 229 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 230 | |
| 231 | if (fp->fdes == fd) |
| 232 | { |
| 233 | fp->fdes = dup (fd); |
| 234 | if (fp->fdes == -1) |
| 235 | scm_syserror ("scm_evict_ports"); |
| 236 | scm_set_port_revealed_x (port, SCM_MAKINUM (0)); |
| 237 | } |
| 238 | } |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | |
| 243 | SCM_DEFINE (scm_file_port_p, "file-port?", 1, 0, 0, |
| 244 | (SCM obj), |
| 245 | "Determine whether @var{obj} is a port that is related to a file.") |
| 246 | #define FUNC_NAME s_scm_file_port_p |
| 247 | { |
| 248 | return SCM_BOOL (SCM_FPORTP (obj)); |
| 249 | } |
| 250 | #undef FUNC_NAME |
| 251 | |
| 252 | |
| 253 | /* scm_open_file |
| 254 | * Return a new port open on a given file. |
| 255 | * |
| 256 | * The mode string must match the pattern: [rwa+]** which |
| 257 | * is interpreted in the usual unix way. |
| 258 | * |
| 259 | * Return the new port. |
| 260 | */ |
| 261 | SCM_DEFINE (scm_open_file, "open-file", 2, 0, 0, |
| 262 | (SCM filename, SCM mode), |
| 263 | "Open the file whose name is @var{filename}, and return a port\n" |
| 264 | "representing that file. The attributes of the port are\n" |
| 265 | "determined by the @var{mode} string. The way in which this is\n" |
| 266 | "interpreted is similar to C stdio. The first character must be\n" |
| 267 | "one of the following:\n" |
| 268 | "@table @samp\n" |
| 269 | "@item r\n" |
| 270 | "Open an existing file for input.\n" |
| 271 | "@item w\n" |
| 272 | "Open a file for output, creating it if it doesn't already exist\n" |
| 273 | "or removing its contents if it does.\n" |
| 274 | "@item a\n" |
| 275 | "Open a file for output, creating it if it doesn't already\n" |
| 276 | "exist. All writes to the port will go to the end of the file.\n" |
| 277 | "The \"append mode\" can be turned off while the port is in use\n" |
| 278 | "@pxref{Ports and File Descriptors, fcntl}\n" |
| 279 | "@end table\n" |
| 280 | "The following additional characters can be appended:\n" |
| 281 | "@table @samp\n" |
| 282 | "@item +\n" |
| 283 | "Open the port for both input and output. E.g., @code{r+}: open\n" |
| 284 | "an existing file for both input and output.\n" |
| 285 | "@item 0\n" |
| 286 | "Create an \"unbuffered\" port. In this case input and output\n" |
| 287 | "operations are passed directly to the underlying port\n" |
| 288 | "implementation without additional buffering. This is likely to\n" |
| 289 | "slow down I/O operations. The buffering mode can be changed\n" |
| 290 | "while a port is in use @pxref{Ports and File Descriptors,\n" |
| 291 | "setvbuf}\n" |
| 292 | "@item l\n" |
| 293 | "Add line-buffering to the port. The port output buffer will be\n" |
| 294 | "automatically flushed whenever a newline character is written.\n" |
| 295 | "@end table\n" |
| 296 | "In theory we could create read/write ports which were buffered\n" |
| 297 | "in one direction only. However this isn't included in the\n" |
| 298 | "current interfaces. If a file cannot be opened with the access\n" |
| 299 | "requested, @code{open-file} throws an exception.") |
| 300 | #define FUNC_NAME s_scm_open_file |
| 301 | { |
| 302 | SCM port; |
| 303 | int fdes; |
| 304 | int flags = 0; |
| 305 | char *file; |
| 306 | char *md; |
| 307 | char *ptr; |
| 308 | |
| 309 | SCM_VALIDATE_STRING (1, filename); |
| 310 | SCM_VALIDATE_STRING (2, mode); |
| 311 | |
| 312 | file = SCM_STRING_CHARS (filename); |
| 313 | md = SCM_STRING_CHARS (mode); |
| 314 | |
| 315 | switch (*md) |
| 316 | { |
| 317 | case 'r': |
| 318 | flags |= O_RDONLY; |
| 319 | break; |
| 320 | case 'w': |
| 321 | flags |= O_WRONLY | O_CREAT | O_TRUNC; |
| 322 | break; |
| 323 | case 'a': |
| 324 | flags |= O_WRONLY | O_CREAT | O_APPEND; |
| 325 | break; |
| 326 | default: |
| 327 | scm_out_of_range (FUNC_NAME, mode); |
| 328 | } |
| 329 | ptr = md + 1; |
| 330 | while (*ptr != '\0') |
| 331 | { |
| 332 | switch (*ptr) |
| 333 | { |
| 334 | case '+': |
| 335 | flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR; |
| 336 | break; |
| 337 | case 'b': |
| 338 | #if defined (O_BINARY) |
| 339 | flags |= O_BINARY; |
| 340 | #endif |
| 341 | break; |
| 342 | case '0': /* unbuffered: handled later. */ |
| 343 | case 'l': /* line buffered: handled during output. */ |
| 344 | break; |
| 345 | default: |
| 346 | scm_out_of_range (FUNC_NAME, mode); |
| 347 | } |
| 348 | ptr++; |
| 349 | } |
| 350 | SCM_SYSCALL (fdes = open (file, flags, 0666)); |
| 351 | if (fdes == -1) |
| 352 | { |
| 353 | int en = errno; |
| 354 | |
| 355 | SCM_SYSERROR_MSG ("~A: ~S", |
| 356 | scm_cons (scm_makfrom0str (strerror (en)), |
| 357 | scm_cons (filename, SCM_EOL)), en); |
| 358 | } |
| 359 | port = scm_fdes_to_port (fdes, md, filename); |
| 360 | return port; |
| 361 | } |
| 362 | #undef FUNC_NAME |
| 363 | |
| 364 | \f |
| 365 | #ifdef __MINGW32__ |
| 366 | /* |
| 367 | * Try getting the appropiate file flags for a given file descriptor |
| 368 | * under Windows. This incorporates some fancy operations because Windows |
| 369 | * differentiates between file, pipe and socket descriptors. |
| 370 | */ |
| 371 | #ifndef O_ACCMODE |
| 372 | # define O_ACCMODE 0x0003 |
| 373 | #endif |
| 374 | |
| 375 | static int getflags (int fdes) |
| 376 | { |
| 377 | int flags = 0; |
| 378 | struct stat buf; |
| 379 | int error, optlen = sizeof (int); |
| 380 | |
| 381 | /* Is this a socket ? */ |
| 382 | if (getsockopt (fdes, SOL_SOCKET, SO_ERROR, (void *) &error, &optlen) >= 0) |
| 383 | flags = O_RDWR; |
| 384 | /* Maybe a regular file ? */ |
| 385 | else if (fstat (fdes, &buf) < 0) |
| 386 | flags = -1; |
| 387 | else |
| 388 | { |
| 389 | /* Or an anonymous pipe handle ? */ |
| 390 | if (buf.st_mode & _S_IFIFO) |
| 391 | flags = PeekNamedPipe ((HANDLE) _get_osfhandle (fdes), NULL, 0, |
| 392 | NULL, NULL, NULL) ? O_RDONLY : O_WRONLY; |
| 393 | /* stdin ? */ |
| 394 | else if (fdes == fileno (stdin) && isatty (fdes)) |
| 395 | flags = O_RDONLY; |
| 396 | /* stdout / stderr ? */ |
| 397 | else if ((fdes == fileno (stdout) || fdes == fileno (stderr)) && |
| 398 | isatty (fdes)) |
| 399 | flags = O_WRONLY; |
| 400 | else |
| 401 | flags = buf.st_mode; |
| 402 | } |
| 403 | return flags; |
| 404 | } |
| 405 | #endif /* __MINGW32__ */ |
| 406 | |
| 407 | /* Building Guile ports from a file descriptor. */ |
| 408 | |
| 409 | /* Build a Scheme port from an open file descriptor `fdes'. |
| 410 | MODE indicates whether FILE is open for reading or writing; it uses |
| 411 | the same notation as open-file's second argument. |
| 412 | NAME is a string to be used as the port's filename. |
| 413 | */ |
| 414 | SCM |
| 415 | scm_fdes_to_port (int fdes, char *mode, SCM name) |
| 416 | #define FUNC_NAME "scm_fdes_to_port" |
| 417 | { |
| 418 | long mode_bits = scm_mode_bits (mode); |
| 419 | SCM port; |
| 420 | scm_t_port *pt; |
| 421 | int flags; |
| 422 | |
| 423 | /* test that fdes is valid. */ |
| 424 | #ifdef __MINGW32__ |
| 425 | flags = getflags (fdes); |
| 426 | #else |
| 427 | flags = fcntl (fdes, F_GETFL, 0); |
| 428 | #endif |
| 429 | if (flags == -1) |
| 430 | SCM_SYSERROR; |
| 431 | flags &= O_ACCMODE; |
| 432 | if (flags != O_RDWR |
| 433 | && ((flags != O_WRONLY && (mode_bits & SCM_WRTNG)) |
| 434 | || (flags != O_RDONLY && (mode_bits & SCM_RDNG)))) |
| 435 | { |
| 436 | SCM_MISC_ERROR ("requested file mode not available on fdes", SCM_EOL); |
| 437 | } |
| 438 | |
| 439 | port = scm_cell (scm_tc16_fport, 0); |
| 440 | SCM_DEFER_INTS; |
| 441 | pt = scm_add_to_port_table (port); |
| 442 | SCM_SETPTAB_ENTRY (port, pt); |
| 443 | SCM_SET_CELL_TYPE (port, (scm_tc16_fport | mode_bits)); |
| 444 | |
| 445 | { |
| 446 | scm_t_fport *fp |
| 447 | = (scm_t_fport *) scm_gc_malloc (sizeof (scm_t_fport), "file port"); |
| 448 | |
| 449 | fp->fdes = fdes; |
| 450 | pt->rw_random = SCM_FDES_RANDOM_P (fdes); |
| 451 | SCM_SETSTREAM (port, fp); |
| 452 | if (mode_bits & SCM_BUF0) |
| 453 | scm_fport_buffer_add (port, 0, 0); |
| 454 | else |
| 455 | scm_fport_buffer_add (port, -1, -1); |
| 456 | } |
| 457 | SCM_SET_FILENAME (port, name); |
| 458 | SCM_ALLOW_INTS; |
| 459 | return port; |
| 460 | } |
| 461 | #undef FUNC_NAME |
| 462 | |
| 463 | /* Return a lower bound on the number of bytes available for input. */ |
| 464 | static int |
| 465 | fport_input_waiting (SCM port) |
| 466 | { |
| 467 | int fdes = SCM_FSTREAM (port)->fdes; |
| 468 | |
| 469 | #ifdef HAVE_SELECT |
| 470 | struct timeval timeout; |
| 471 | SELECT_TYPE read_set; |
| 472 | SELECT_TYPE write_set; |
| 473 | SELECT_TYPE except_set; |
| 474 | |
| 475 | FD_ZERO (&read_set); |
| 476 | FD_ZERO (&write_set); |
| 477 | FD_ZERO (&except_set); |
| 478 | |
| 479 | FD_SET (fdes, &read_set); |
| 480 | |
| 481 | timeout.tv_sec = 0; |
| 482 | timeout.tv_usec = 0; |
| 483 | |
| 484 | if (select (SELECT_SET_SIZE, |
| 485 | &read_set, &write_set, &except_set, &timeout) |
| 486 | < 0) |
| 487 | scm_syserror ("fport_input_waiting"); |
| 488 | return FD_ISSET (fdes, &read_set) ? 1 : 0; |
| 489 | #elif defined (FIONREAD) |
| 490 | int remir; |
| 491 | ioctl(fdes, FIONREAD, &remir); |
| 492 | return remir; |
| 493 | #else |
| 494 | scm_misc_error ("fport_input_waiting", |
| 495 | "Not fully implemented on this platform", |
| 496 | SCM_EOL); |
| 497 | #endif |
| 498 | } |
| 499 | |
| 500 | \f |
| 501 | static int |
| 502 | fport_print (SCM exp, SCM port, scm_print_state *pstate SCM_UNUSED) |
| 503 | { |
| 504 | scm_puts ("#<", port); |
| 505 | scm_print_port_mode (exp, port); |
| 506 | if (SCM_OPFPORTP (exp)) |
| 507 | { |
| 508 | int fdes; |
| 509 | SCM name = SCM_FILENAME (exp); |
| 510 | if (SCM_STRINGP (name) || SCM_SYMBOLP (name)) |
| 511 | scm_display (name, port); |
| 512 | else |
| 513 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
| 514 | scm_putc (' ', port); |
| 515 | fdes = (SCM_FSTREAM (exp))->fdes; |
| 516 | |
| 517 | #ifdef HAVE_TTYNAME |
| 518 | if (isatty (fdes)) |
| 519 | scm_puts (ttyname (fdes), port); |
| 520 | else |
| 521 | #endif /* HAVE_TTYNAME */ |
| 522 | scm_intprint (fdes, 10, port); |
| 523 | } |
| 524 | else |
| 525 | { |
| 526 | scm_puts (SCM_PTOBNAME (SCM_PTOBNUM (exp)), port); |
| 527 | scm_putc (' ', port); |
| 528 | scm_intprint ((scm_t_bits) SCM_PTAB_ENTRY (exp), 16, port); |
| 529 | } |
| 530 | scm_putc ('>', port); |
| 531 | return 1; |
| 532 | } |
| 533 | |
| 534 | #ifdef GUILE_ISELECT |
| 535 | /* thread-local block for input on fport's fdes. */ |
| 536 | static void |
| 537 | fport_wait_for_input (SCM port) |
| 538 | { |
| 539 | int fdes = SCM_FSTREAM (port)->fdes; |
| 540 | |
| 541 | if (!fport_input_waiting (port)) |
| 542 | { |
| 543 | int n; |
| 544 | SELECT_TYPE readfds; |
| 545 | int flags = fcntl (fdes, F_GETFL); |
| 546 | |
| 547 | if (flags == -1) |
| 548 | scm_syserror ("scm_fdes_wait_for_input"); |
| 549 | if (!(flags & O_NONBLOCK)) |
| 550 | do |
| 551 | { |
| 552 | FD_ZERO (&readfds); |
| 553 | FD_SET (fdes, &readfds); |
| 554 | n = scm_internal_select (fdes + 1, &readfds, NULL, NULL, NULL); |
| 555 | } |
| 556 | while (n == -1 && errno == EINTR); |
| 557 | } |
| 558 | } |
| 559 | #endif |
| 560 | |
| 561 | static void fport_flush (SCM port); |
| 562 | |
| 563 | /* fill a port's read-buffer with a single read. returns the first |
| 564 | char or EOF if end of file. */ |
| 565 | static int |
| 566 | fport_fill_input (SCM port) |
| 567 | { |
| 568 | long count; |
| 569 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 570 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 571 | |
| 572 | #ifdef GUILE_ISELECT |
| 573 | fport_wait_for_input (port); |
| 574 | #endif |
| 575 | SCM_SYSCALL (count = read (fp->fdes, pt->read_buf, pt->read_buf_size)); |
| 576 | if (count == -1) |
| 577 | scm_syserror ("fport_fill_input"); |
| 578 | if (count == 0) |
| 579 | return EOF; |
| 580 | else |
| 581 | { |
| 582 | pt->read_pos = pt->read_buf; |
| 583 | pt->read_end = pt->read_buf + count; |
| 584 | return *pt->read_buf; |
| 585 | } |
| 586 | } |
| 587 | |
| 588 | static off_t |
| 589 | fport_seek (SCM port, off_t offset, int whence) |
| 590 | { |
| 591 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 592 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 593 | off_t rv; |
| 594 | off_t result; |
| 595 | |
| 596 | if (pt->rw_active == SCM_PORT_WRITE) |
| 597 | { |
| 598 | if (offset != 0 || whence != SEEK_CUR) |
| 599 | { |
| 600 | fport_flush (port); |
| 601 | result = rv = lseek (fp->fdes, offset, whence); |
| 602 | } |
| 603 | else |
| 604 | { |
| 605 | /* read current position without disturbing the buffer. */ |
| 606 | rv = lseek (fp->fdes, offset, whence); |
| 607 | result = rv + (pt->write_pos - pt->write_buf); |
| 608 | } |
| 609 | } |
| 610 | else if (pt->rw_active == SCM_PORT_READ) |
| 611 | { |
| 612 | if (offset != 0 || whence != SEEK_CUR) |
| 613 | { |
| 614 | /* could expand to avoid a second seek. */ |
| 615 | scm_end_input (port); |
| 616 | result = rv = lseek (fp->fdes, offset, whence); |
| 617 | } |
| 618 | else |
| 619 | { |
| 620 | /* read current position without disturbing the buffer |
| 621 | (particularly the unread-char buffer). */ |
| 622 | rv = lseek (fp->fdes, offset, whence); |
| 623 | result = rv - (pt->read_end - pt->read_pos); |
| 624 | |
| 625 | if (pt->read_buf == pt->putback_buf) |
| 626 | result -= pt->saved_read_end - pt->saved_read_pos; |
| 627 | } |
| 628 | } |
| 629 | else /* SCM_PORT_NEITHER */ |
| 630 | { |
| 631 | result = rv = lseek (fp->fdes, offset, whence); |
| 632 | } |
| 633 | |
| 634 | if (rv == -1) |
| 635 | scm_syserror ("fport_seek"); |
| 636 | |
| 637 | return result; |
| 638 | } |
| 639 | |
| 640 | static void |
| 641 | fport_truncate (SCM port, off_t length) |
| 642 | { |
| 643 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 644 | |
| 645 | if (ftruncate (fp->fdes, length) == -1) |
| 646 | scm_syserror ("ftruncate"); |
| 647 | } |
| 648 | |
| 649 | /* helper for fport_write: try to write data, using multiple system |
| 650 | calls if required. */ |
| 651 | #define FUNC_NAME "write_all" |
| 652 | static void write_all (SCM port, const void *data, size_t remaining) |
| 653 | { |
| 654 | int fdes = SCM_FSTREAM (port)->fdes; |
| 655 | |
| 656 | while (remaining > 0) |
| 657 | { |
| 658 | size_t done; |
| 659 | |
| 660 | SCM_SYSCALL (done = write (fdes, data, remaining)); |
| 661 | |
| 662 | if (done == -1) |
| 663 | SCM_SYSERROR; |
| 664 | remaining -= done; |
| 665 | data = ((const char *) data) + done; |
| 666 | } |
| 667 | } |
| 668 | #undef FUNC_NAME |
| 669 | |
| 670 | static void |
| 671 | fport_write (SCM port, const void *data, size_t size) |
| 672 | { |
| 673 | /* this procedure tries to minimize the number of writes/flushes. */ |
| 674 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 675 | |
| 676 | if (pt->write_buf == &pt->shortbuf |
| 677 | || (pt->write_pos == pt->write_buf && size >= pt->write_buf_size)) |
| 678 | { |
| 679 | /* "unbuffered" port, or |
| 680 | port with empty buffer and data won't fit in buffer. */ |
| 681 | write_all (port, data, size); |
| 682 | return; |
| 683 | } |
| 684 | |
| 685 | { |
| 686 | off_t space = pt->write_end - pt->write_pos; |
| 687 | |
| 688 | if (size <= space) |
| 689 | { |
| 690 | /* data fits in buffer. */ |
| 691 | memcpy (pt->write_pos, data, size); |
| 692 | pt->write_pos += size; |
| 693 | if (pt->write_pos == pt->write_end) |
| 694 | { |
| 695 | fport_flush (port); |
| 696 | /* we can skip the line-buffering check if nothing's buffered. */ |
| 697 | return; |
| 698 | } |
| 699 | } |
| 700 | else |
| 701 | { |
| 702 | memcpy (pt->write_pos, data, space); |
| 703 | pt->write_pos = pt->write_end; |
| 704 | fport_flush (port); |
| 705 | { |
| 706 | const void *ptr = ((const char *) data) + space; |
| 707 | size_t remaining = size - space; |
| 708 | |
| 709 | if (size >= pt->write_buf_size) |
| 710 | { |
| 711 | write_all (port, ptr, remaining); |
| 712 | return; |
| 713 | } |
| 714 | else |
| 715 | { |
| 716 | memcpy (pt->write_pos, ptr, remaining); |
| 717 | pt->write_pos += remaining; |
| 718 | } |
| 719 | } |
| 720 | } |
| 721 | |
| 722 | /* handle line buffering. */ |
| 723 | if ((SCM_CELL_WORD_0 (port) & SCM_BUFLINE) && memchr (data, '\n', size)) |
| 724 | fport_flush (port); |
| 725 | } |
| 726 | } |
| 727 | |
| 728 | /* becomes 1 when process is exiting: normal exception handling won't |
| 729 | work by this time. */ |
| 730 | extern int terminating; |
| 731 | |
| 732 | static void |
| 733 | fport_flush (SCM port) |
| 734 | { |
| 735 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 736 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 737 | unsigned char *ptr = pt->write_buf; |
| 738 | long init_size = pt->write_pos - pt->write_buf; |
| 739 | long remaining = init_size; |
| 740 | |
| 741 | while (remaining > 0) |
| 742 | { |
| 743 | long count; |
| 744 | |
| 745 | SCM_SYSCALL (count = write (fp->fdes, ptr, remaining)); |
| 746 | if (count < 0) |
| 747 | { |
| 748 | /* error. assume nothing was written this call, but |
| 749 | fix up the buffer for any previous successful writes. */ |
| 750 | long done = init_size - remaining; |
| 751 | |
| 752 | if (done > 0) |
| 753 | { |
| 754 | int i; |
| 755 | |
| 756 | for (i = 0; i < remaining; i++) |
| 757 | { |
| 758 | *(pt->write_buf + i) = *(pt->write_buf + done + i); |
| 759 | } |
| 760 | pt->write_pos = pt->write_buf + remaining; |
| 761 | } |
| 762 | if (terminating) |
| 763 | { |
| 764 | const char *msg = "Error: could not flush file-descriptor "; |
| 765 | char buf[11]; |
| 766 | |
| 767 | write (2, msg, strlen (msg)); |
| 768 | sprintf (buf, "%d\n", fp->fdes); |
| 769 | write (2, buf, strlen (buf)); |
| 770 | |
| 771 | count = remaining; |
| 772 | } |
| 773 | else if (scm_gc_running_p) |
| 774 | { |
| 775 | /* silently ignore the error. scm_error would abort if we |
| 776 | called it now. */ |
| 777 | count = remaining; |
| 778 | } |
| 779 | else |
| 780 | scm_syserror ("fport_flush"); |
| 781 | } |
| 782 | ptr += count; |
| 783 | remaining -= count; |
| 784 | } |
| 785 | pt->write_pos = pt->write_buf; |
| 786 | pt->rw_active = SCM_PORT_NEITHER; |
| 787 | } |
| 788 | |
| 789 | /* clear the read buffer and adjust the file position for unread bytes. */ |
| 790 | static void |
| 791 | fport_end_input (SCM port, int offset) |
| 792 | { |
| 793 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 794 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 795 | |
| 796 | offset += pt->read_end - pt->read_pos; |
| 797 | |
| 798 | if (offset > 0) |
| 799 | { |
| 800 | pt->read_pos = pt->read_end; |
| 801 | /* will throw error if unread-char used at beginning of file |
| 802 | then attempting to write. seems correct. */ |
| 803 | if (lseek (fp->fdes, -offset, SEEK_CUR) == -1) |
| 804 | scm_syserror ("fport_end_input"); |
| 805 | } |
| 806 | pt->rw_active = SCM_PORT_NEITHER; |
| 807 | } |
| 808 | |
| 809 | static int |
| 810 | fport_close (SCM port) |
| 811 | { |
| 812 | scm_t_fport *fp = SCM_FSTREAM (port); |
| 813 | scm_t_port *pt = SCM_PTAB_ENTRY (port); |
| 814 | int rv; |
| 815 | |
| 816 | fport_flush (port); |
| 817 | SCM_SYSCALL (rv = close (fp->fdes)); |
| 818 | if (rv == -1 && errno != EBADF) |
| 819 | { |
| 820 | if (scm_gc_running_p) |
| 821 | /* silently ignore the error. scm_error would abort if we |
| 822 | called it now. */ |
| 823 | ; |
| 824 | else |
| 825 | scm_syserror ("fport_close"); |
| 826 | } |
| 827 | if (pt->read_buf == pt->putback_buf) |
| 828 | pt->read_buf = pt->saved_read_buf; |
| 829 | if (pt->read_buf != &pt->shortbuf) |
| 830 | scm_gc_free (pt->read_buf, pt->read_buf_size, "port buffer"); |
| 831 | if (pt->write_buf != &pt->shortbuf) |
| 832 | scm_gc_free (pt->write_buf, pt->write_buf_size, "port buffer"); |
| 833 | scm_gc_free (fp, sizeof (*fp), "file port"); |
| 834 | return rv; |
| 835 | } |
| 836 | |
| 837 | static size_t |
| 838 | fport_free (SCM port) |
| 839 | { |
| 840 | fport_close (port); |
| 841 | return 0; |
| 842 | } |
| 843 | |
| 844 | static scm_t_bits |
| 845 | scm_make_fptob () |
| 846 | { |
| 847 | scm_t_bits tc = scm_make_port_type ("file", fport_fill_input, fport_write); |
| 848 | |
| 849 | scm_set_port_free (tc, fport_free); |
| 850 | scm_set_port_print (tc, fport_print); |
| 851 | scm_set_port_flush (tc, fport_flush); |
| 852 | scm_set_port_end_input (tc, fport_end_input); |
| 853 | scm_set_port_close (tc, fport_close); |
| 854 | scm_set_port_seek (tc, fport_seek); |
| 855 | scm_set_port_truncate (tc, fport_truncate); |
| 856 | scm_set_port_input_waiting (tc, fport_input_waiting); |
| 857 | |
| 858 | return tc; |
| 859 | } |
| 860 | |
| 861 | void |
| 862 | scm_init_fports () |
| 863 | { |
| 864 | scm_tc16_fport = scm_make_fptob (); |
| 865 | |
| 866 | scm_c_define ("_IOFBF", SCM_MAKINUM (_IOFBF)); |
| 867 | scm_c_define ("_IOLBF", SCM_MAKINUM (_IOLBF)); |
| 868 | scm_c_define ("_IONBF", SCM_MAKINUM (_IONBF)); |
| 869 | |
| 870 | #ifndef SCM_MAGIC_SNARFER |
| 871 | #include "libguile/fports.x" |
| 872 | #endif |
| 873 | } |
| 874 | |
| 875 | /* |
| 876 | Local Variables: |
| 877 | c-file-style: "gnu" |
| 878 | End: |
| 879 | */ |