1 /* $OpenBSD: diff.c,v 1.67 2019/06/28 13:35:00 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Todd C. Miller <Todd.Miller (at) courtesan.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 * 18 * Sponsored in part by the Defense Advanced Research Projects 19 * Agency (DARPA) and Air Force Research Laboratory, Air Force 20 * Materiel Command, USAF, under agreement number F39502-99-1-0512. 21 */ 22 23 #include <sys/cdefs.h> 24 #include <sys/stat.h> 25 26 #include <ctype.h> 27 #include <err.h> 28 #include <errno.h> 29 #include <getopt.h> 30 #include <stdlib.h> 31 #include <stdio.h> 32 #include <string.h> 33 #include <unistd.h> 34 #include <limits.h> 35 36 #include "diff.h" 37 #include "xmalloc.h" 38 39 bool lflag, Nflag, Pflag, rflag, sflag, Tflag, cflag; 40 bool ignore_file_case, suppress_common, brief_diff; 41 int diff_format, diff_context, status; 42 int width = 130; 43 char *start, *ifdefname, *diffargs, *label[2]; 44 char *ignore_pats, *most_recent_pat; 45 char *group_format = NULL; 46 const char *add_code, *del_code; 47 struct stat stb1, stb2; 48 struct excludes *excludes_list; 49 regex_t ignore_re, most_recent_re; 50 51 #define OPTIONS "0123456789aBbC:cdD:efF:HhI:iL:lnNPpqrS:sTtU:uwW:X:x:y" 52 enum { 53 OPT_TSIZE = CHAR_MAX + 1, 54 OPT_STRIPCR, 55 OPT_IGN_FN_CASE, 56 OPT_NO_IGN_FN_CASE, 57 OPT_NORMAL, 58 OPT_HELP, 59 OPT_HORIZON_LINES, 60 OPT_CHANGED_GROUP_FORMAT, 61 OPT_SUPPRESS_COMMON, 62 OPT_VERSION, 63 }; 64 65 static struct option longopts[] = { 66 { "text", no_argument, 0, 'a' }, 67 { "ignore-space-change", no_argument, 0, 'b' }, 68 { "context", optional_argument, 0, 'C' }, 69 { "ifdef", required_argument, 0, 'D' }, 70 { "minimal", no_argument, 0, 'd' }, 71 { "ed", no_argument, 0, 'e' }, 72 { "forward-ed", no_argument, 0, 'f' }, 73 { "show-function-line", required_argument, 0, 'F' }, 74 { "speed-large-files", no_argument, NULL, 'H' }, 75 { "ignore-blank-lines", no_argument, 0, 'B' }, 76 { "ignore-matching-lines", required_argument, 0, 'I' }, 77 { "ignore-case", no_argument, 0, 'i' }, 78 { "paginate", no_argument, NULL, 'l' }, 79 { "label", required_argument, 0, 'L' }, 80 { "new-file", no_argument, 0, 'N' }, 81 { "rcs", no_argument, 0, 'n' }, 82 { "unidirectional-new-file", no_argument, 0, 'P' }, 83 { "show-c-function", no_argument, 0, 'p' }, 84 { "brief", no_argument, 0, 'q' }, 85 { "recursive", no_argument, 0, 'r' }, 86 { "report-identical-files", no_argument, 0, 's' }, 87 { "starting-file", required_argument, 0, 'S' }, 88 { "expand-tabs", no_argument, 0, 't' }, 89 { "initial-tab", no_argument, 0, 'T' }, 90 { "unified", optional_argument, 0, 'U' }, 91 { "ignore-all-space", no_argument, 0, 'w' }, 92 { "width", required_argument, 0, 'W' }, 93 { "exclude", required_argument, 0, 'x' }, 94 { "exclude-from", required_argument, 0, 'X' }, 95 { "side-by-side", no_argument, NULL, 'y' }, 96 { "ignore-file-name-case", no_argument, NULL, OPT_IGN_FN_CASE }, 97 { "horizon-lines", required_argument, NULL, OPT_HORIZON_LINES }, 98 { "no-ignore-file-name-case", no_argument, NULL, OPT_NO_IGN_FN_CASE }, 99 { "normal", no_argument, NULL, OPT_NORMAL }, 100 { "strip-trailing-cr", no_argument, NULL, OPT_STRIPCR }, 101 { "changed-group-format", required_argument, NULL, OPT_CHANGED_GROUP_FORMAT}, 102 { "suppress-common-lines", no_argument, NULL, OPT_SUPPRESS_COMMON }, 103 { NULL, 0, 0, '\0'} 104 }; 105 106 static void checked_regcomp(char const *, regex_t *); 107 static void usage(void) __dead; 108 static void conflicting_format(void) __dead; 109 static void push_excludes(char *); 110 static void push_ignore_pats(char *); 111 static void read_excludes_file(char *file); 112 static void set_argstr(char **, char **); 113 static char *splice(char *, char *); 114 115 int 116 main(int argc, char **argv) 117 { 118 char *ep, **oargv; 119 long l; 120 int ch, dflags, lastch, gotstdin, prevoptind, newarg; 121 122 oargv = argv; 123 gotstdin = 0; 124 dflags = 0; 125 lastch = '\0'; 126 prevoptind = 1; 127 newarg = 1; 128 diff_context = 3; 129 diff_format = D_UNSET; 130 #define FORMAT_MISMATCHED(type) \ 131 (diff_format != D_UNSET && diff_format != (type)) 132 while ((ch = getopt_long(argc, argv, OPTIONS, longopts, NULL)) != -1) { 133 switch (ch) { 134 case '0': case '1': case '2': case '3': case '4': 135 case '5': case '6': case '7': case '8': case '9': 136 if (newarg) 137 usage(); /* disallow -[0-9]+ */ 138 else if (lastch == 'c' || lastch == 'u') 139 diff_context = 0; 140 else if (!isdigit(lastch) || diff_context > INT_MAX / 10) 141 usage(); 142 diff_context = (diff_context * 10) + (ch - '0'); 143 break; 144 case 'a': 145 dflags |= D_FORCEASCII; 146 break; 147 case 'b': 148 dflags |= D_FOLDBLANKS; 149 break; 150 case 'C': 151 case 'c': 152 if (FORMAT_MISMATCHED(D_CONTEXT)) 153 conflicting_format(); 154 cflag = true; 155 diff_format = D_CONTEXT; 156 if (optarg != NULL) { 157 l = strtol(optarg, &ep, 10); 158 if (*ep != '\0' || l < 0 || l >= INT_MAX) 159 usage(); 160 diff_context = (int)l; 161 } 162 break; 163 case 'd': 164 dflags |= D_MINIMAL; 165 break; 166 case 'D': 167 if (FORMAT_MISMATCHED(D_IFDEF)) 168 conflicting_format(); 169 diff_format = D_IFDEF; 170 ifdefname = optarg; 171 break; 172 case 'e': 173 if (FORMAT_MISMATCHED(D_EDIT)) 174 conflicting_format(); 175 diff_format = D_EDIT; 176 break; 177 case 'f': 178 if (FORMAT_MISMATCHED(D_REVERSE)) 179 conflicting_format(); 180 diff_format = D_REVERSE; 181 break; 182 case 'H': 183 /* ignore but needed for compatibility with GNU diff */ 184 break; 185 case 'h': 186 /* silently ignore for backwards compatibility */ 187 break; 188 case 'B': 189 dflags |= D_SKIPBLANKLINES; 190 break; 191 case 'F': 192 if (dflags & D_PROTOTYPE) 193 conflicting_format(); 194 dflags |= D_MATCHLAST; 195 most_recent_pat = xstrdup(optarg); 196 break; 197 case 'I': 198 push_ignore_pats(optarg); 199 break; 200 case 'i': 201 dflags |= D_IGNORECASE; 202 break; 203 case 'L': 204 if (label[0] == NULL) 205 label[0] = optarg; 206 else if (label[1] == NULL) 207 label[1] = optarg; 208 else 209 usage(); 210 break; 211 case 'l': 212 lflag = true; 213 break; 214 case 'N': 215 Nflag = true; 216 break; 217 case 'n': 218 if (FORMAT_MISMATCHED(D_NREVERSE)) 219 conflicting_format(); 220 diff_format = D_NREVERSE; 221 break; 222 case 'p': 223 if (dflags & D_MATCHLAST) 224 conflicting_format(); 225 dflags |= D_PROTOTYPE; 226 break; 227 case 'P': 228 Pflag = true; 229 break; 230 case 'r': 231 rflag = true; 232 break; 233 case 'q': 234 brief_diff = true; 235 break; 236 case 'S': 237 start = optarg; 238 break; 239 case 's': 240 sflag = true; 241 break; 242 case 'T': 243 Tflag = true; 244 break; 245 case 't': 246 dflags |= D_EXPANDTABS; 247 break; 248 case 'U': 249 case 'u': 250 if (FORMAT_MISMATCHED(D_UNIFIED)) 251 conflicting_format(); 252 diff_format = D_UNIFIED; 253 if (optarg != NULL) { 254 l = strtol(optarg, &ep, 10); 255 if (*ep != '\0' || l < 0 || l >= INT_MAX) 256 usage(); 257 diff_context = (int)l; 258 } 259 break; 260 case 'w': 261 dflags |= D_IGNOREBLANKS; 262 break; 263 case 'W': 264 if (optarg != NULL) { 265 l = strtol(optarg, &ep, 10); 266 if (*ep != '\0' || l < 0 || l >= INT_MAX) 267 usage(); 268 width = (int)l; 269 } else { 270 usage(); 271 } 272 break; 273 case 'X': 274 read_excludes_file(optarg); 275 break; 276 case 'x': 277 push_excludes(optarg); 278 break; 279 case 'y': 280 if (FORMAT_MISMATCHED(D_SIDEBYSIDE)) 281 conflicting_format(); 282 diff_format = D_SIDEBYSIDE; 283 break; 284 case OPT_CHANGED_GROUP_FORMAT: 285 if (FORMAT_MISMATCHED(D_GFORMAT)) 286 conflicting_format(); 287 diff_format = D_GFORMAT; 288 group_format = optarg; 289 break; 290 case OPT_HORIZON_LINES: 291 break; /* XXX TODO for compatibility with GNU diff3 */ 292 case OPT_IGN_FN_CASE: 293 ignore_file_case = true; 294 break; 295 case OPT_NO_IGN_FN_CASE: 296 ignore_file_case = false; 297 break; 298 case OPT_NORMAL: 299 if (FORMAT_MISMATCHED(D_NORMAL)) 300 conflicting_format(); 301 diff_format = D_NORMAL; 302 break; 303 case OPT_STRIPCR: 304 dflags |= D_STRIPCR; 305 break; 306 case OPT_SUPPRESS_COMMON: 307 suppress_common = 1; 308 break; 309 default: 310 usage(); 311 break; 312 } 313 lastch = ch; 314 newarg = optind != prevoptind; 315 prevoptind = optind; 316 } 317 if (diff_format == D_UNSET && (dflags & D_PROTOTYPE) != 0) 318 diff_format = D_CONTEXT; 319 if (diff_format == D_UNSET) 320 diff_format = D_NORMAL; 321 argc -= optind; 322 argv += optind; 323 324 /* 325 * Do sanity checks, fill in stb1 and stb2 and call the appropriate 326 * driver routine. Both drivers use the contents of stb1 and stb2. 327 */ 328 if (argc != 2) 329 usage(); 330 checked_regcomp(ignore_pats, &ignore_re); 331 checked_regcomp(most_recent_pat, &most_recent_re); 332 if (strcmp(argv[0], "-") == 0) { 333 fstat(STDIN_FILENO, &stb1); 334 gotstdin = 1; 335 } else if (stat(argv[0], &stb1) != 0) { 336 if (!Nflag || errno != ENOENT) 337 err(2, "%s", argv[0]); 338 dflags |= D_EMPTY1; 339 memset(&stb1, 0, sizeof(struct stat)); 340 } 341 342 if (strcmp(argv[1], "-") == 0) { 343 fstat(STDIN_FILENO, &stb2); 344 gotstdin = 1; 345 } else if (stat(argv[1], &stb2) != 0) { 346 if (!Nflag || errno != ENOENT) 347 err(2, "%s", argv[1]); 348 dflags |= D_EMPTY2; 349 memset(&stb2, 0, sizeof(stb2)); 350 stb2.st_mode = stb1.st_mode; 351 } 352 353 if (dflags & D_EMPTY1 && dflags & D_EMPTY2){ 354 warn("%s", argv[0]); 355 warn("%s", argv[1]); 356 exit(2); 357 } 358 359 if (stb1.st_mode == 0) 360 stb1.st_mode = stb2.st_mode; 361 362 if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode))) 363 errx(2, "can't compare - to a directory"); 364 set_argstr(oargv, argv); 365 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 366 if (diff_format == D_IFDEF) 367 errx(2, "-D option not supported with directories"); 368 diffdir(argv[0], argv[1], dflags); 369 } else { 370 if (S_ISDIR(stb1.st_mode)) { 371 argv[0] = splice(argv[0], argv[1]); 372 if (stat(argv[0], &stb1) == -1) 373 err(2, "%s", argv[0]); 374 } 375 if (S_ISDIR(stb2.st_mode)) { 376 argv[1] = splice(argv[1], argv[0]); 377 if (stat(argv[1], &stb2) == -1) 378 err(2, "%s", argv[1]); 379 } 380 print_status(diffreg(argv[0], argv[1], dflags), argv[0], 381 argv[1], ""); 382 } 383 exit(status); 384 } 385 386 static void 387 checked_regcomp(char const *pattern, regex_t *comp) 388 { 389 char buf[BUFSIZ]; 390 int error; 391 392 if (pattern == NULL) 393 return; 394 395 error = regcomp(comp, pattern, REG_NEWLINE | REG_EXTENDED); 396 if (error != 0) { 397 regerror(error, comp, buf, sizeof(buf)); 398 if (*pattern != '\0') 399 errx(2, "%s: %s", pattern, buf); 400 else 401 errx(2, "%s", buf); 402 } 403 } 404 405 static void 406 set_argstr(char **av, char **ave) 407 { 408 size_t argsize; 409 char **ap; 410 411 argsize = 4 + *ave - *av + 1; 412 diffargs = xmalloc(argsize); 413 strlcpy(diffargs, "diff", argsize); 414 for (ap = av + 1; ap < ave; ap++) { 415 if (strcmp(*ap, "--") != 0) { 416 strlcat(diffargs, " ", argsize); 417 strlcat(diffargs, *ap, argsize); 418 } 419 } 420 } 421 422 /* 423 * Read in an excludes file and push each line. 424 */ 425 static void 426 read_excludes_file(char *file) 427 { 428 FILE *fp; 429 char *buf, *pattern; 430 size_t len; 431 432 if (strcmp(file, "-") == 0) 433 fp = stdin; 434 else if ((fp = fopen(file, "r")) == NULL) 435 err(2, "%s", file); 436 while ((buf = fgetln(fp, &len)) != NULL) { 437 if (buf[len - 1] == '\n') 438 len--; 439 if ((pattern = strndup(buf, len)) == NULL) 440 err(2, "xstrndup"); 441 push_excludes(pattern); 442 } 443 if (strcmp(file, "-") != 0) 444 fclose(fp); 445 } 446 447 /* 448 * Push a pattern onto the excludes list. 449 */ 450 static void 451 push_excludes(char *pattern) 452 { 453 struct excludes *entry; 454 455 entry = xmalloc(sizeof(*entry)); 456 entry->pattern = pattern; 457 entry->next = excludes_list; 458 excludes_list = entry; 459 } 460 461 static void 462 push_ignore_pats(char *pattern) 463 { 464 size_t len; 465 466 if (ignore_pats == NULL) 467 ignore_pats = xstrdup(pattern); 468 else { 469 /* old + "|" + new + NUL */ 470 len = strlen(ignore_pats) + strlen(pattern) + 2; 471 ignore_pats = xreallocarray(ignore_pats, 1, len); 472 strlcat(ignore_pats, "|", len); 473 strlcat(ignore_pats, pattern, len); 474 } 475 } 476 477 void 478 print_status(int val, char *path1, char *path2, const char *entry) 479 { 480 if (label[0] != NULL) 481 path1 = label[0]; 482 if (label[1] != NULL) 483 path2 = label[1]; 484 485 switch (val) { 486 case D_BINARY: 487 printf("Binary files %s%s and %s%s differ\n", 488 path1, entry, path2, entry); 489 break; 490 case D_DIFFER: 491 if (brief_diff) 492 printf("Files %s%s and %s%s differ\n", 493 path1, entry, path2, entry); 494 break; 495 case D_SAME: 496 if (sflag) 497 printf("Files %s%s and %s%s are identical\n", 498 path1, entry, path2, entry); 499 break; 500 case D_MISMATCH1: 501 printf("File %s%s is a directory while file %s%s is a regular file\n", 502 path1, entry, path2, entry); 503 break; 504 case D_MISMATCH2: 505 printf("File %s%s is a regular file while file %s%s is a directory\n", 506 path1, entry, path2, entry); 507 break; 508 case D_SKIPPED1: 509 printf("File %s%s is not a regular file or directory and was skipped\n", 510 path1, entry); 511 break; 512 case D_SKIPPED2: 513 printf("File %s%s is not a regular file or directory and was skipped\n", 514 path2, entry); 515 break; 516 case D_ERROR: 517 break; 518 } 519 } 520 521 static void 522 usage(void) 523 { 524 (void)fprintf(stderr, 525 "usage: diff [-aBbdilpTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]\n" 526 " [--no-ignore-case] [--normal] [--strip-trailing-cr]\n" 527 " [-I pattern] [-F pattern] [-L label] file1 file2\n" 528 " diff [-aBbdilpTtw] [-I pattern] [-L label] [--ignore-case]\n" 529 " [--no-ignore-case] [--normal] [--strip-trailing-cr]\n" 530 " [-F pattern] -C number file1 file2\n" 531 " diff [-aBbdiltw] [-I pattern] [--ignore-case] [--no-ignore-case]\n" 532 " [--normal] [--strip-trailing-cr] -D string file1 file2\n" 533 " diff [-aBbdilpTtw] [-I pattern] [-L label] [--ignore-case]\n" 534 " [--no-ignore-case] [--normal] [--strip-trailing-cr]\n" 535 " [-F pattern] -U number file1 file2\n" 536 " diff [-aBbdilNPprsTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]\n" 537 " [--no-ignore-case] [--normal] [-I pattern] [-L label]\n" 538 " [-F pattern] [-S name] [-X file] [-x pattern] dir1 dir2\n" 539 " diff [-aBbditwW] [--expand-tabs] [--ignore-all-space]\n" 540 " [--ignore-blank-lines] [--ignore-case] [--minimal]\n" 541 " [--no-ignore-file-name-case] [--strip-trailing-cr]\n" 542 " [--suppress-common-lines] [--text] [--width]\n" 543 " -y | --side-by-side file1 file2\n"); 544 545 exit(2); 546 } 547 548 static void 549 conflicting_format(void) 550 { 551 552 fprintf(stderr, "error: conflicting output format options.\n"); 553 usage(); 554 } 555 556 static char * 557 splice(char *dir, char *path) 558 { 559 char *tail, *buf; 560 size_t dirlen; 561 562 dirlen = strlen(dir); 563 while (dirlen != 0 && dir[dirlen - 1] == '/') 564 dirlen--; 565 if ((tail = strrchr(path, '/')) == NULL) 566 tail = path; 567 else 568 tail++; 569 xasprintf(&buf, "%.*s/%s", (int)dirlen, dir, tail); 570 return (buf); 571 } 572
Indexes created Sat Feb 21 08:20:20 UTC 2026