1 /* $OpenBSD: diff.c,v 1.43 2003/10/07 23:37:27 millert Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Todd C. Miller <Todd.Miller@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 #ifndef lint 24 static const char rcsid[] = "$OpenBSD: diff.c,v 1.43 2003/10/07 23:37:27 millert Exp $"; 25 #endif /* not lint */ 26 27 #include <sys/param.h> 28 #include <sys/stat.h> 29 30 #include <ctype.h> 31 #include <err.h> 32 #include <errno.h> 33 #include <getopt.h> 34 #include <signal.h> 35 #include <stdlib.h> 36 #include <stdio.h> 37 #include <stdarg.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 #include "diff.h" 42 43 int aflag, bflag, dflag, iflag, lflag, Nflag, Pflag, rflag; 44 int sflag, tflag, Tflag, wflag; 45 int format, context, status; 46 char *start, *ifdefname, *diffargs, *label; 47 struct stat stb1, stb2; 48 struct excludes *excludes_list; 49 50 #define OPTIONS "0123456789abC:cdD:efhiL:lnNPqrS:sTtU:uwX:x:" 51 static struct option longopts[] = { 52 { "text", no_argument, 0, 'a' }, 53 { "ignore-space-change", no_argument, 0, 'b' }, 54 { "context", optional_argument, 0, 'C' }, 55 { "ifdef", required_argument, 0, 'D' }, 56 { "minimal", no_argument, 0, 'd' }, 57 { "ed", no_argument, 0, 'e' }, 58 { "forward-ed", no_argument, 0, 'f' }, 59 { "ignore-case", no_argument, 0, 'i' }, 60 { "paginate", no_argument, 0, 'l' }, 61 { "label", required_argument, 0, 'L' }, 62 { "new-file", no_argument, 0, 'N' }, 63 { "rcs", no_argument, 0, 'n' }, 64 { "unidirectional-new-file", no_argument, 0, 'P' }, 65 { "brief", no_argument, 0, 'q' }, 66 { "recursive", no_argument, 0, 'r' }, 67 { "report-identical-files", no_argument, 0, 's' }, 68 { "starting-file", required_argument, 0, 'S' }, 69 { "expand-tabs", no_argument, 0, 't' }, 70 { "initial-tab", no_argument, 0, 'T' }, 71 { "unified", optional_argument, 0, 'U' }, 72 { "ignore-all-space", no_argument, 0, 'w' }, 73 { "exclude", required_argument, 0, 'x' }, 74 { "exclude-from", required_argument, 0, 'X' }, 75 { NULL, 0, 0, '\0'} 76 }; 77 78 __dead void usage(void); 79 void push_excludes(char *); 80 void read_excludes_file(char *file); 81 void set_argstr(char **, char **); 82 83 int 84 main(int argc, char **argv) 85 { 86 char *ep, **oargv; 87 long l; 88 int ch, lastch, gotstdin, prevoptind, newarg; 89 90 oargv = argv; 91 gotstdin = 0; 92 93 lastch = '\0'; 94 prevoptind = 1; 95 newarg = 1; 96 while ((ch = getopt_long(argc, argv, OPTIONS, longopts, NULL)) != -1) { 97 switch (ch) { 98 case '0': case '1': case '2': case '3': case '4': 99 case '5': case '6': case '7': case '8': case '9': 100 if (newarg) 101 usage(); /* disallow -[0-9]+ */ 102 else if (lastch == 'c' || lastch == 'u') 103 context = 0; 104 else if (!isdigit(lastch) || context > INT_MAX / 10) 105 usage(); 106 context = (context * 10) + (ch - '0'); 107 break; 108 case 'a': 109 aflag = 1; 110 break; 111 case 'b': 112 bflag = 1; 113 break; 114 case 'C': 115 case 'c': 116 format = D_CONTEXT; 117 if (optarg != NULL) { 118 l = strtol(optarg, &ep, 10); 119 if (*ep != '\0' || l < 0 || l >= INT_MAX) 120 usage(); 121 context = (int)l; 122 } else 123 context = 3; 124 break; 125 case 'd': 126 dflag = 1; 127 break; 128 case 'D': 129 format = D_IFDEF; 130 ifdefname = optarg; 131 break; 132 case 'e': 133 format = D_EDIT; 134 break; 135 case 'f': 136 format = D_REVERSE; 137 break; 138 case 'h': 139 /* silently ignore for backwards compatibility */ 140 break; 141 case 'i': 142 iflag = 1; 143 break; 144 case 'L': 145 label = optarg; 146 break; 147 case 'l': 148 lflag = 1; 149 signal(SIGPIPE, SIG_IGN); 150 break; 151 case 'N': 152 Nflag = 1; 153 break; 154 case 'n': 155 format = D_NREVERSE; 156 break; 157 case 'P': 158 Pflag = 1; 159 break; 160 case 'r': 161 rflag = 1; 162 break; 163 case 'q': 164 format = D_BRIEF; 165 break; 166 case 'S': 167 start = optarg; 168 break; 169 case 's': 170 sflag = 1; 171 break; 172 case 'T': 173 Tflag = 1; 174 break; 175 case 't': 176 tflag = 1; 177 break; 178 case 'U': 179 case 'u': 180 format = D_UNIFIED; 181 if (optarg != NULL) { 182 l = strtol(optarg, &ep, 10); 183 if (*ep != '\0' || l < 0 || l >= INT_MAX) 184 usage(); 185 context = (int)l; 186 } else 187 context = 3; 188 break; 189 case 'w': 190 wflag = 1; 191 break; 192 case 'X': 193 read_excludes_file(optarg); 194 break; 195 case 'x': 196 push_excludes(optarg); 197 break; 198 default: 199 usage(); 200 break; 201 } 202 lastch = ch; 203 newarg = optind != prevoptind; 204 prevoptind = optind; 205 } 206 argc -= optind; 207 argv += optind; 208 209 /* 210 * Do sanity checks, fill in stb1 and stb2 and call the appropriate 211 * driver routine. Both drivers use the contents of stb1 and stb2. 212 */ 213 if (argc != 2) 214 usage(); 215 if (strcmp(argv[0], "-") == 0) { 216 fstat(STDIN_FILENO, &stb1); 217 gotstdin = 1; 218 } else if (stat(argv[0], &stb1) != 0) 219 err(2, "%s", argv[0]); 220 if (strcmp(argv[1], "-") == 0) { 221 fstat(STDIN_FILENO, &stb2); 222 gotstdin = 1; 223 } else if (stat(argv[1], &stb2) != 0) 224 err(2, "%s", argv[1]); 225 if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode))) 226 errx(2, "can't compare - to a directory"); 227 set_argstr(oargv + 1, argv); 228 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 229 if (format == D_IFDEF) 230 errx(2, "-D option not supported with directories"); 231 diffdir(argv[0], argv[1]); 232 } else { 233 if (S_ISDIR(stb1.st_mode)) { 234 argv[0] = splice(argv[0], argv[1]); 235 if (stat(argv[0], &stb1) < 0) 236 err(2, "%s", argv[0]); 237 } 238 if (S_ISDIR(stb2.st_mode)) { 239 argv[1] = splice(argv[1], argv[0]); 240 if (stat(argv[1], &stb2) < 0) 241 err(2, "%s", argv[1]); 242 } 243 print_status(diffreg(argv[0], argv[1], 0), argv[0], argv[1], 244 NULL); 245 } 246 exit(status); 247 } 248 249 void * 250 emalloc(size_t n) 251 { 252 void *p; 253 254 if ((p = malloc(n)) == NULL) 255 err(2, NULL); 256 return (p); 257 } 258 259 void * 260 erealloc(void *p, size_t n) 261 { 262 void *q; 263 264 if ((q = realloc(p, n)) == NULL) 265 err(2, NULL); 266 return (q); 267 } 268 269 int 270 easprintf(char **ret, const char *fmt, ...) 271 { 272 int len; 273 va_list ap; 274 275 va_start(ap, fmt); 276 len = vasprintf(ret, fmt, ap); 277 va_end(ap); 278 279 if (len == -1) 280 err(2, NULL); 281 return (len); 282 } 283 284 void 285 set_argstr(char **av, char **ave) 286 { 287 size_t argsize; 288 char **ap; 289 290 argsize = 4 + *ave - *av + 1; 291 diffargs = emalloc(argsize); 292 strlcpy(diffargs, "diff", argsize); 293 for (ap = av + 1; ap < ave; ap++) { 294 if (strcmp(*ap, "--") != 0) { 295 strlcat(diffargs, " ", argsize); 296 strlcat(diffargs, *ap, argsize); 297 } 298 } 299 } 300 301 /* 302 * Read in an excludes file and push each line. 303 */ 304 void 305 read_excludes_file(char *file) 306 { 307 FILE *fp; 308 char *buf, *pattern; 309 size_t len; 310 311 if (strcmp(file, "-") == 0) 312 fp = stdin; 313 else if ((fp = fopen(file, "r")) == NULL) 314 err(2, "%s", file); 315 while ((buf = fgetln(fp, &len)) != NULL) { 316 if (buf[len - 1] == '\n') 317 len--; 318 pattern = emalloc(len + 1); 319 memcpy(pattern, buf, len); 320 pattern[len] = '\0'; 321 push_excludes(pattern); 322 } 323 if (strcmp(file, "-") != 0) 324 fclose(fp); 325 } 326 327 /* 328 * Push a pattern onto the excludes list. 329 */ 330 void 331 push_excludes(char *pattern) 332 { 333 struct excludes *entry; 334 335 entry = emalloc(sizeof(*entry)); 336 entry->pattern = pattern; 337 entry->next = excludes_list; 338 excludes_list = entry; 339 } 340 341 void 342 print_only(const char *path, size_t dirlen, const char *entry) 343 { 344 if (dirlen > 1) 345 dirlen--; 346 printf("Only in %.*s: %s\n", (int)dirlen, path, entry); 347 } 348 349 void 350 print_status(int val, char *path1, char *path2, char *entry) 351 { 352 switch (val) { 353 case D_ONLY: 354 print_only(path1, strlen(path1), entry); 355 break; 356 case D_COMMON: 357 printf("Common subdirectories: %s%s and %s%s\n", 358 path1, entry ? entry : "", path2, entry ? entry : ""); 359 break; 360 case D_BINARY: 361 printf("Binary files %s%s and %s%s differ\n", 362 path1, entry ? entry : "", path2, entry ? entry : ""); 363 break; 364 case D_DIFFER: 365 if (format == D_BRIEF) 366 printf("Files %s%s and %s%s differ\n", 367 path1, entry ? entry : "", 368 path2, entry ? entry : ""); 369 break; 370 case D_SAME: 371 if (sflag) 372 printf("Files %s%s and %s%s are identical\n", 373 path1, entry ? entry : "", 374 path2, entry ? entry : ""); 375 break; 376 case D_MISMATCH1: 377 printf("File %s%s is a directory while file %s%s is a regular file\n", 378 path1, entry ? entry : "", path2, entry ? entry : ""); 379 break; 380 case D_MISMATCH2: 381 printf("File %s%s is a regular file while file %s%s is a directory\n", 382 path1, entry ? entry : "", path2, entry ? entry : ""); 383 break; 384 } 385 } 386 387 __dead void 388 usage(void) 389 { 390 (void)fprintf(stderr, 391 "usage: diff [-abdilqtTw] [-c | -e | -f | -n | -u] [-L label] file1 file2\n" 392 " diff [-abdilqtTw] [-L label] -C number file1 file2\n" 393 " diff [-abdilqtw] -D string file1 file2\n" 394 " diff [-abdilqtTw] [-L label] -U number file1 file2\n" 395 " diff [-abdilNPqtTw] [-c | -e | -f | -n | -u ] [-L label] [-r] [-s]\n" 396 " [-S name] [-X file] [-x pattern] dir1 dir2\n"); 397 398 exit(2); 399 } 400