1 /* $NetBSD: file.c,v 1.17 2022/09/24 20:21:46 christos Exp $ */ 2 3 /* 4 * Copyright (c) Ian F. Darwin 1986-1995. 5 * Software written by Ian F. Darwin and others; 6 * maintained 1995-present by Christos Zoulas and others. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice immediately at the beginning of the file, without modification, 13 * this list of conditions, and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 /* 31 * file - find type of a file or files - main program. 32 */ 33 34 #include "file.h" 35 36 #ifndef lint 37 #if 0 38 FILE_RCSID("@(#)$File: file.c,v 1.205 2022/09/15 16:54:14 christos Exp $") 39 #else 40 __RCSID("$NetBSD: file.c,v 1.17 2022/09/24 20:21:46 christos Exp $"); 41 #endif 42 #endif /* lint */ 43 44 #include "magic.h" 45 46 #include <stdlib.h> 47 #include <unistd.h> 48 #include <string.h> 49 #ifdef RESTORE_TIME 50 # if (__COHERENT__ >= 0x420) 51 # include <sys/utime.h> 52 # else 53 # ifdef USE_UTIMES 54 # include <sys/time.h> 55 # else 56 # include <utime.h> 57 # endif 58 # endif 59 #endif 60 #ifdef HAVE_UNISTD_H 61 #include <unistd.h> /* for read() */ 62 #endif 63 #ifdef HAVE_WCHAR_H 64 #include <wchar.h> 65 #endif 66 #ifdef HAVE_WCTYPE_H 67 #include <wctype.h> 68 #endif 69 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH) && \ 70 defined(HAVE_WCTYPE_H) 71 #define FILE_WIDE_SUPPORT 72 #else 73 #include <ctype.h> 74 #endif 75 76 #if defined(HAVE_GETOPT_H) && defined(HAVE_STRUCT_OPTION) 77 # include <getopt.h> 78 # ifndef HAVE_GETOPT_LONG 79 int getopt_long(int, char * const *, const char *, 80 const struct option *, int *); 81 # endif 82 # else 83 # include "mygetopt.h" 84 #endif 85 86 #ifdef S_IFLNK 87 # define IFLNK_h "h" 88 # define IFLNK_L "L" 89 #else 90 # define IFLNK_h "" 91 # define IFLNK_L "" 92 #endif 93 94 #define FILE_FLAGS "bcCdE" IFLNK_h "ik" IFLNK_L "lNnprsSvzZ0" 95 #define OPTSTRING "bcCde:Ef:F:hiklLm:nNpP:rsSvzZ0" 96 97 # define USAGE \ 98 "Usage: %s [-" FILE_FLAGS "] [--apple] [--extension] [--mime-encoding]\n" \ 99 " [--mime-type] [-e <testname>] [-F <separator>] " \ 100 " [-f <namefile>]\n" \ 101 " [-m <magicfiles>] [-P <parameter=value>] [--exclude-quiet]\n" \ 102 " <file> ...\n" \ 103 " %s -C [-m <magicfiles>]\n" \ 104 " %s [--help]\n" 105 106 private int /* Global command-line options */ 107 bflag = 0, /* brief output format */ 108 nopad = 0, /* Don't pad output */ 109 nobuffer = 0, /* Do not buffer stdout */ 110 nulsep = 0; /* Append '\0' to the separator */ 111 112 private const char *separator = ":"; /* Default field separator */ 113 private const struct option long_options[] = { 114 #define OPT_HELP 1 115 #define OPT_APPLE 2 116 #define OPT_EXTENSIONS 3 117 #define OPT_MIME_TYPE 4 118 #define OPT_MIME_ENCODING 5 119 #define OPT_EXCLUDE_QUIET 6 120 #define OPT(shortname, longname, opt, def, doc) \ 121 {longname, opt, NULL, shortname}, 122 #define OPT_LONGONLY(longname, opt, def, doc, id) \ 123 {longname, opt, NULL, id}, 124 #include "file_opts.h" 125 #undef OPT 126 #undef OPT_LONGONLY 127 {0, 0, NULL, 0} 128 }; 129 130 private const struct { 131 const char *name; 132 int value; 133 } nv[] = { 134 { "apptype", MAGIC_NO_CHECK_APPTYPE }, 135 { "ascii", MAGIC_NO_CHECK_ASCII }, 136 { "cdf", MAGIC_NO_CHECK_CDF }, 137 { "compress", MAGIC_NO_CHECK_COMPRESS }, 138 { "csv", MAGIC_NO_CHECK_CSV }, 139 { "elf", MAGIC_NO_CHECK_ELF }, 140 { "encoding", MAGIC_NO_CHECK_ENCODING }, 141 { "soft", MAGIC_NO_CHECK_SOFT }, 142 { "tar", MAGIC_NO_CHECK_TAR }, 143 { "json", MAGIC_NO_CHECK_JSON }, 144 { "text", MAGIC_NO_CHECK_TEXT }, /* synonym for ascii */ 145 { "tokens", MAGIC_NO_CHECK_TOKENS }, /* OBSOLETE: ignored for backwards compatibility */ 146 }; 147 148 private struct { 149 const char *name; 150 size_t value; 151 size_t def; 152 const char *desc; 153 int tag; 154 int set; 155 } pm[] = { 156 { "bytes", 0, FILE_BYTES_MAX, "max bytes to look inside file", 157 MAGIC_PARAM_BYTES_MAX, 0 }, 158 { "elf_notes", 0, FILE_ELF_NOTES_MAX, "max ELF notes processed", 159 MAGIC_PARAM_ELF_NOTES_MAX, 0 }, 160 { "elf_phnum", 0, FILE_ELF_PHNUM_MAX, "max ELF prog sections processed", 161 MAGIC_PARAM_ELF_PHNUM_MAX, 0 }, 162 { "elf_shnum", 0, FILE_ELF_SHNUM_MAX, "max ELF sections processed", 163 MAGIC_PARAM_ELF_SHNUM_MAX, 0 }, 164 { "encoding", 0, FILE_ENCODING_MAX, "max bytes to scan for encoding", 165 MAGIC_PARAM_ENCODING_MAX, 0 }, 166 { "indir", 0, FILE_INDIR_MAX, "recursion limit for indirection", 167 MAGIC_PARAM_INDIR_MAX, 0 }, 168 { "name", 0, FILE_NAME_MAX, "use limit for name/use magic", 169 MAGIC_PARAM_NAME_MAX, 0 }, 170 { "regex", 0, FILE_REGEX_MAX, "length limit for REGEX searches", 171 MAGIC_PARAM_REGEX_MAX, 0 }, 172 }; 173 174 private int posixly; 175 176 #ifdef __dead 177 __dead 178 #endif 179 private void usage(void); 180 private void docprint(const char *, int); 181 #ifdef __dead 182 __dead 183 #endif 184 private void help(void); 185 186 private int unwrap(struct magic_set *, const char *); 187 private int process(struct magic_set *ms, const char *, int); 188 private struct magic_set *load(const char *, int); 189 private void setparam(const char *); 190 private void applyparam(magic_t); 191 192 193 /* 194 * main - parse arguments and handle options 195 */ 196 int 197 main(int argc, char *argv[]) 198 { 199 int c; 200 size_t i, j, wid, nw; 201 int action = 0, didsomefiles = 0, errflg = 0; 202 int flags = 0, e = 0; 203 #ifdef HAVE_LIBSECCOMP 204 int sandbox = 1; 205 #endif 206 struct magic_set *magic = NULL; 207 int longindex; 208 const char *magicfile = NULL; /* where the magic is */ 209 char *progname; 210 211 /* makes islower etc work for other langs */ 212 (void)setlocale(LC_CTYPE, ""); 213 214 #ifdef __EMX__ 215 /* sh-like wildcard expansion! Shouldn't hurt at least ... */ 216 _wildcard(&argc, &argv); 217 #endif 218 219 if ((progname = strrchr(argv[0], '/')) != NULL) 220 progname++; 221 else 222 progname = argv[0]; 223 224 file_setprogname(progname); 225 226 227 #ifdef S_IFLNK 228 posixly = getenv("POSIXLY_CORRECT") != NULL; 229 flags |= posixly ? MAGIC_SYMLINK : 0; 230 #endif 231 while ((c = getopt_long(argc, argv, OPTSTRING, long_options, 232 &longindex)) != -1) 233 switch (c) { 234 case OPT_HELP: 235 help(); 236 break; 237 case OPT_APPLE: 238 flags |= MAGIC_APPLE; 239 break; 240 case OPT_EXTENSIONS: 241 flags |= MAGIC_EXTENSION; 242 break; 243 case OPT_MIME_TYPE: 244 flags |= MAGIC_MIME_TYPE; 245 break; 246 case OPT_MIME_ENCODING: 247 flags |= MAGIC_MIME_ENCODING; 248 break; 249 case '0': 250 nulsep++; 251 break; 252 case 'b': 253 bflag++; 254 break; 255 case 'c': 256 action = FILE_CHECK; 257 break; 258 case 'C': 259 action = FILE_COMPILE; 260 break; 261 case 'd': 262 flags |= MAGIC_DEBUG|MAGIC_CHECK; 263 break; 264 case 'E': 265 flags |= MAGIC_ERROR; 266 break; 267 case 'e': 268 case OPT_EXCLUDE_QUIET: 269 for (i = 0; i < __arraycount(nv); i++) 270 if (strcmp(nv[i].name, optarg) == 0) 271 break; 272 273 if (i == __arraycount(nv)) { 274 if (c != OPT_EXCLUDE_QUIET) 275 errflg++; 276 } else 277 flags |= nv[i].value; 278 break; 279 280 case 'f': 281 if(action) 282 usage(); 283 if (magic == NULL) 284 if ((magic = load(magicfile, flags)) == NULL) 285 return 1; 286 applyparam(magic); 287 e |= unwrap(magic, optarg); 288 ++didsomefiles; 289 break; 290 case 'F': 291 separator = optarg; 292 break; 293 case 'i': 294 flags |= MAGIC_MIME; 295 break; 296 case 'k': 297 flags |= MAGIC_CONTINUE; 298 break; 299 case 'l': 300 action = FILE_LIST; 301 break; 302 case 'm': 303 magicfile = optarg; 304 break; 305 case 'n': 306 ++nobuffer; 307 break; 308 case 'N': 309 ++nopad; 310 break; 311 #if defined(HAVE_UTIME) || defined(HAVE_UTIMES) 312 case 'p': 313 flags |= MAGIC_PRESERVE_ATIME; 314 break; 315 #endif 316 case 'P': 317 setparam(optarg); 318 break; 319 case 'r': 320 flags |= MAGIC_RAW; 321 break; 322 case 's': 323 flags |= MAGIC_DEVICES; 324 break; 325 case 'S': 326 #ifdef HAVE_LIBSECCOMP 327 sandbox = 0; 328 #endif 329 break; 330 case 'v': 331 if (magicfile == NULL) 332 magicfile = magic_getpath(magicfile, action); 333 (void)fprintf(stdout, "%s-%s\n", file_getprogname(), 334 VERSION); 335 (void)fprintf(stdout, "magic file from %s\n", 336 magicfile); 337 #ifdef HAVE_LIBSECCOMP 338 (void)fprintf(stdout, "seccomp support included\n"); 339 #endif 340 return 0; 341 case 'z': 342 flags |= MAGIC_COMPRESS; 343 break; 344 345 case 'Z': 346 flags |= MAGIC_COMPRESS|MAGIC_COMPRESS_TRANSP; 347 break; 348 #ifdef S_IFLNK 349 case 'L': 350 flags |= MAGIC_SYMLINK; 351 break; 352 case 'h': 353 flags &= ~MAGIC_SYMLINK; 354 break; 355 #endif 356 case '?': 357 default: 358 errflg++; 359 break; 360 } 361 362 if (errflg) { 363 usage(); 364 } 365 if (e) 366 return e; 367 368 #ifdef HAVE_LIBSECCOMP 369 #if 0 370 if (sandbox && enable_sandbox_basic() == -1) 371 #else 372 if (sandbox && enable_sandbox_full() == -1) 373 #endif 374 file_err(EXIT_FAILURE, "SECCOMP initialisation failed"); 375 if (sandbox) 376 flags |= MAGIC_NO_COMPRESS_FORK; 377 #endif /* HAVE_LIBSECCOMP */ 378 379 if (MAGIC_VERSION != magic_version()) 380 file_warnx("Compiled magic version [%d] " 381 "does not match with shared library magic version [%d]\n", 382 MAGIC_VERSION, magic_version()); 383 384 switch(action) { 385 case FILE_CHECK: 386 case FILE_COMPILE: 387 case FILE_LIST: 388 /* 389 * Don't try to check/compile ~/.magic unless we explicitly 390 * ask for it. 391 */ 392 magic = magic_open(flags|MAGIC_CHECK); 393 if (magic == NULL) { 394 file_warn("Can't create magic"); 395 return 1; 396 } 397 398 399 switch(action) { 400 case FILE_CHECK: 401 c = magic_check(magic, magicfile); 402 break; 403 case FILE_COMPILE: 404 c = magic_compile(magic, magicfile); 405 break; 406 case FILE_LIST: 407 c = magic_list(magic, magicfile); 408 break; 409 default: 410 abort(); 411 } 412 if (c == -1) { 413 file_warnx("%s", magic_error(magic)); 414 e = 1; 415 goto out; 416 } 417 goto out; 418 default: 419 if (magic == NULL) 420 if ((magic = load(magicfile, flags)) == NULL) 421 return 1; 422 applyparam(magic); 423 } 424 425 if (optind == argc) { 426 if (!didsomefiles) 427 usage(); 428 goto out; 429 } 430 431 for (wid = 0, j = CAST(size_t, optind); j < CAST(size_t, argc); 432 j++) { 433 nw = file_mbswidth(magic, argv[j]); 434 if (nw > wid) 435 wid = nw; 436 } 437 438 /* 439 * If bflag is only set twice, set it depending on 440 * number of files [this is undocumented, and subject to change] 441 */ 442 if (bflag == 2) { 443 bflag = optind >= argc - 1; 444 } 445 for (; optind < argc; optind++) 446 e |= process(magic, argv[optind], wid); 447 448 out: 449 if (!nobuffer) 450 e |= fflush(stdout) != 0; 451 452 if (magic) 453 magic_close(magic); 454 return e; 455 } 456 457 private void 458 applyparam(magic_t magic) 459 { 460 size_t i; 461 462 for (i = 0; i < __arraycount(pm); i++) { 463 if (!pm[i].set) 464 continue; 465 if (magic_setparam(magic, pm[i].tag, &pm[i].value) == -1) 466 file_err(EXIT_FAILURE, "Can't set %s", pm[i].name); 467 } 468 } 469 470 private void 471 setparam(const char *p) 472 { 473 size_t i; 474 char *s; 475 476 if ((s = CCAST(char *, strchr(p, '='))) == NULL) 477 goto badparm; 478 479 for (i = 0; i < __arraycount(pm); i++) { 480 if (strncmp(p, pm[i].name, s - p) != 0) 481 continue; 482 pm[i].value = atoi(s + 1); 483 pm[i].set = 1; 484 return; 485 } 486 badparm: 487 file_errx(EXIT_FAILURE, "Unknown param %s", p); 488 } 489 490 private struct magic_set * 491 /*ARGSUSED*/ 492 load(const char *magicfile, int flags) 493 { 494 struct magic_set *magic = magic_open(flags); 495 const char *e; 496 497 if (magic == NULL) { 498 file_warn("Can't create magic"); 499 return NULL; 500 } 501 if (magic_load(magic, magicfile) == -1) { 502 file_warn("%s", magic_error(magic)); 503 magic_close(magic); 504 return NULL; 505 } 506 if ((e = magic_error(magic)) != NULL) 507 file_warn("%s", e); 508 return magic; 509 } 510 511 /* 512 * unwrap -- read a file of filenames, do each one. 513 */ 514 private int 515 unwrap(struct magic_set *ms, const char *fn) 516 { 517 FILE *f; 518 ssize_t len; 519 char *line = NULL; 520 size_t llen = 0; 521 int wid = 0, cwid; 522 int e = 0; 523 size_t fi = 0, fimax = 100; 524 char **flist = CAST(char **, malloc(sizeof(*flist) * fimax)); 525 526 if (flist == NULL) 527 out: file_err(EXIT_FAILURE, "Cannot allocate memory for file list"); 528 529 if (strcmp("-", fn) == 0) 530 f = stdin; 531 else { 532 if ((f = fopen(fn, "r")) == NULL) { 533 file_warn("Cannot open `%s'", fn); 534 return 1; 535 } 536 } 537 538 while ((len = getline(&line, &llen, f)) > 0) { 539 if (line[len - 1] == '\n') 540 line[len - 1] = '\0'; 541 if (fi >= fimax) { 542 fimax += 100; 543 char **nf = CAST(char **, 544 realloc(flist, fimax * sizeof(*flist))); 545 if (nf == NULL) 546 goto out; 547 flist = nf; 548 } 549 flist[fi++] = line; 550 cwid = file_mbswidth(ms, line); 551 if (cwid > wid) 552 wid = cwid; 553 line = NULL; 554 llen = 0; 555 } 556 557 fimax = fi; 558 for (fi = 0; fi < fimax; fi++) { 559 e |= process(ms, flist[fi], wid); 560 free(flist[fi]); 561 } 562 free(flist); 563 564 if (f != stdin) 565 (void)fclose(f); 566 return e; 567 } 568 569 private void 570 file_octal(unsigned char c) 571 { 572 putc('\\', stdout); 573 putc(((c >> 6) & 7) + '0', stdout); 574 putc(((c >> 3) & 7) + '0', stdout); 575 putc(((c >> 0) & 7) + '0', stdout); 576 } 577 578 private void 579 fname_print(const char *inname) 580 { 581 size_t n = strlen(inname); 582 #ifdef FILE_WIDE_SUPPORT 583 mbstate_t state; 584 wchar_t nextchar; 585 size_t bytesconsumed; 586 587 588 (void)memset(&state, 0, sizeof(state)); 589 while (n > 0) { 590 bytesconsumed = mbrtowc(&nextchar, inname, n, &state); 591 if (bytesconsumed == CAST(size_t, -1) || 592 bytesconsumed == CAST(size_t, -2)) { 593 nextchar = *inname++; 594 n--; 595 (void)memset(&state, 0, sizeof(state)); 596 file_octal(CAST(unsigned char, nextchar)); 597 continue; 598 } 599 inname += bytesconsumed; 600 n -= bytesconsumed; 601 if (iswprint(nextchar)) { 602 printf("%lc", nextchar); 603 continue; 604 } 605 /* XXX: What if it is > 255? */ 606 file_octal(CAST(unsigned char, nextchar)); 607 } 608 #else 609 size_t i; 610 for (i = 0; i < n; i++) { 611 unsigned char c = CAST(unsigned char, inname[i]); 612 if (isprint(c)) { 613 putc(c); 614 continue; 615 } 616 file_octal(c); 617 } 618 #endif 619 } 620 621 /* 622 * Called for each input file on the command line (or in a list of files) 623 */ 624 private int 625 process(struct magic_set *ms, const char *inname, int wid) 626 { 627 const char *type, c = nulsep > 1 ? '\0' : '\n'; 628 int std_in = strcmp(inname, "-") == 0; 629 int haderror = 0; 630 631 if (wid > 0 && !bflag) { 632 const char *pname = std_in ? "/dev/stdin" : inname; 633 if ((ms->flags & MAGIC_RAW) == 0) 634 fname_print(pname); 635 else 636 (void)printf("%s", pname); 637 if (nulsep) 638 (void)putc('\0', stdout); 639 if (nulsep < 2) { 640 (void)printf("%s", separator); 641 (void)printf("%*s ", CAST(int, nopad ? 0 642 : (wid - file_mbswidth(ms, inname))), ""); 643 } 644 } 645 646 type = magic_file(ms, std_in ? NULL : inname); 647 648 if (type == NULL) { 649 haderror |= printf("ERROR: %s%c", magic_error(ms), c); 650 } else { 651 haderror |= printf("%s%c", type, c) < 0; 652 } 653 if (nobuffer) 654 haderror |= fflush(stdout) != 0; 655 return haderror || type == NULL; 656 } 657 658 protected size_t 659 file_mbswidth(struct magic_set *ms, const char *s) 660 { 661 size_t width = 0; 662 #ifdef FILE_WIDE_SUPPORT 663 size_t bytesconsumed, n; 664 mbstate_t state; 665 wchar_t nextchar; 666 667 (void)memset(&state, 0, sizeof(state)); 668 n = strlen(s); 669 670 while (n > 0) { 671 bytesconsumed = mbrtowc(&nextchar, s, n, &state); 672 if (bytesconsumed == CAST(size_t, -1) || 673 bytesconsumed == CAST(size_t, -2)) { 674 nextchar = *s; 675 bytesconsumed = 1; 676 (void)memset(&state, 0, sizeof(state)); 677 width += 4; 678 } else { 679 int w = wcwidth(nextchar); 680 width += ((ms->flags & MAGIC_RAW) != 0 681 || iswprint(nextchar)) ? (w > 0 ? w : 1) : 4; 682 } 683 684 s += bytesconsumed, n -= bytesconsumed; 685 } 686 #else 687 for (; *s; s++) { 688 width += (ms->flags & MAGIC_RAW) != 0 689 || isprint(CAST(unsigned char, *s)) ? 1 : 4; 690 } 691 #endif 692 return width; 693 } 694 695 private void 696 usage(void) 697 { 698 const char *pn = file_getprogname(); 699 (void)fprintf(stderr, USAGE, pn, pn, pn); 700 exit(EXIT_FAILURE); 701 } 702 703 private void 704 defprint(int def) 705 { 706 if (!def) 707 return; 708 if (((def & 1) && posixly) || ((def & 2) && !posixly)) 709 fprintf(stdout, " (default)"); 710 fputc('\n', stdout); 711 } 712 713 private void 714 docprint(const char *opts, int def) 715 { 716 size_t i; 717 int comma, pad; 718 char *sp, *p; 719 720 p = CCAST(char *, strchr(opts, '%')); 721 if (p == NULL) { 722 fprintf(stdout, "%s", opts); 723 defprint(def); 724 return; 725 } 726 727 for (sp = p - 1; sp > opts && *sp == ' '; sp--) 728 continue; 729 730 fprintf(stdout, "%.*s", CAST(int, p - opts), opts); 731 pad = (int)CAST(int, p - sp - 1); 732 733 switch (*++p) { 734 case 'e': 735 comma = 0; 736 for (i = 0; i < __arraycount(nv); i++) { 737 fprintf(stdout, "%s%s", comma++ ? ", " : "", nv[i].name); 738 if (i && i % 5 == 0 && i != __arraycount(nv) - 1) { 739 fprintf(stdout, ",\n%*s", pad, ""); 740 comma = 0; 741 } 742 } 743 break; 744 case 'P': 745 for (i = 0; i < __arraycount(pm); i++) { 746 fprintf(stdout, "%9s %7zu %s", pm[i].name, pm[i].def, 747 pm[i].desc); 748 if (i != __arraycount(pm) - 1) 749 fprintf(stdout, "\n%*s", pad, ""); 750 } 751 break; 752 default: 753 file_errx(EXIT_FAILURE, "Unknown escape `%c' in long options", 754 *p); 755 break; 756 } 757 fprintf(stdout, "%s", opts + (p - opts) + 1); 758 759 } 760 761 private void 762 help(void) 763 { 764 (void)fputs( 765 "Usage: file [OPTION...] [FILE...]\n" 766 "Determine type of FILEs.\n" 767 "\n", stdout); 768 #define OPT(shortname, longname, opt, def, doc) \ 769 fprintf(stdout, " -%c, --" longname, shortname), \ 770 docprint(doc, def); 771 #define OPT_LONGONLY(longname, opt, def, doc, id) \ 772 fprintf(stdout, " --" longname), \ 773 docprint(doc, def); 774 #include "file_opts.h" 775 #undef OPT 776 #undef OPT_LONGONLY 777 fprintf(stdout, "\nReport bugs to https://bugs.astron.com/\n"); 778 exit(EXIT_SUCCESS); 779 } 780 781 private const char *file_progname; 782 783 protected void 784 file_setprogname(const char *progname) 785 { 786 file_progname = progname; 787 } 788 789 protected const char * 790 file_getprogname(void) 791 { 792 return file_progname; 793 } 794 795 protected void 796 file_err(int e, const char *fmt, ...) 797 { 798 va_list ap; 799 int se = errno; 800 801 va_start(ap, fmt); 802 fprintf(stderr, "%s: ", file_progname); 803 vfprintf(stderr, fmt, ap); 804 va_end(ap); 805 if (se) 806 fprintf(stderr, " (%s)\n", strerror(se)); 807 else 808 fputc('\n', stderr); 809 exit(e); 810 } 811 812 protected void 813 file_errx(int e, const char *fmt, ...) 814 { 815 va_list ap; 816 817 va_start(ap, fmt); 818 fprintf(stderr, "%s: ", file_progname); 819 vfprintf(stderr, fmt, ap); 820 va_end(ap); 821 fprintf(stderr, "\n"); 822 exit(e); 823 } 824 825 protected void 826 file_warn(const char *fmt, ...) 827 { 828 va_list ap; 829 int se = errno; 830 831 va_start(ap, fmt); 832 fprintf(stderr, "%s: ", file_progname); 833 vfprintf(stderr, fmt, ap); 834 va_end(ap); 835 if (se) 836 fprintf(stderr, " (%s)\n", strerror(se)); 837 else 838 fputc('\n', stderr); 839 errno = se; 840 } 841 842 protected void 843 file_warnx(const char *fmt, ...) 844 { 845 va_list ap; 846 int se = errno; 847 848 va_start(ap, fmt); 849 fprintf(stderr, "%s: ", file_progname); 850 vfprintf(stderr, fmt, ap); 851 va_end(ap); 852 fprintf(stderr, "\n"); 853 errno = se; 854 } 855