1 /* $OpenBSD: diff.c,v 1.25 2003/07/06 22:17:21 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 1.25 2003/07/06 22:17:21 millert Exp $"; 25 #endif /* not lint */ 26 27 #include <sys/param.h> 28 #include <sys/stat.h> 29 30 #include <err.h> 31 #include <errno.h> 32 #include <getopt.h> 33 #include <stdlib.h> 34 #include <stdio.h> 35 #include <stdarg.h> 36 #include <string.h> 37 #include <unistd.h> 38 39 #include "diff.h" 40 41 int aflag, bflag, iflag, Nflag, Pflag, rflag, sflag, tflag, wflag; 42 int format, context, status; 43 char *start, *ifdefname, *diffargs; 44 struct stat stb1, stb2; 45 struct excludes *excludes_list; 46 47 #define OPTIONS "abC:cD:efhinNPqrS:stU:uwX:x:" 48 static struct option longopts[] = { 49 { "text", no_argument, 0, 'a' }, 50 { "ignore-space-change", no_argument, 0, 'b' }, 51 { "context", optional_argument, 0, 'C' }, 52 { "ifdef", required_argument, 0, 'D' }, 53 { "ed", no_argument, 0, 'e' }, 54 { "forward-ed", no_argument, 0, 'f' }, 55 { "ignore-case", no_argument, 0, 'i' }, 56 { "new-file", no_argument, 0, 'N' }, 57 { "rcs", no_argument, 0, 'n' }, 58 { "unidirectional-new-file", no_argument, 0, 'P' }, 59 { "brief", no_argument, 0, 'q' }, 60 { "recursive", no_argument, 0, 'r' }, 61 { "report-identical-files", no_argument, 0, 's' }, 62 { "starting-file", required_argument, 0, 'S' }, 63 { "expand-tabs", no_argument, 0, 't' }, 64 { "unified", optional_argument, 0, 'U' }, 65 { "ignore-all-space", no_argument, 0, 'w' }, 66 { "exclude", required_argument, 0, 'x' }, 67 { "exclude-from", required_argument, 0, 'X' }, 68 }; 69 70 __dead void usage(void); 71 void push_excludes(char *); 72 void read_excludes_file(char *file); 73 void set_argstr(char **, char **); 74 75 int 76 main(int argc, char **argv) 77 { 78 char *ep, **oargv; 79 long l; 80 int ch, gotstdin; 81 82 oargv = argv; 83 gotstdin = 0; 84 85 while ((ch = getopt_long(argc, argv, OPTIONS, longopts, NULL)) != -1) { 86 switch (ch) { 87 case 'a': 88 aflag = 1; 89 break; 90 case 'b': 91 bflag = 1; 92 break; 93 case 'C': 94 case 'c': 95 format = D_CONTEXT; 96 if (optarg != NULL) { 97 l = strtol(optarg, &ep, 10); 98 if (*ep != '\0' || l < 0 || l >= INT_MAX) 99 usage(); 100 context = (int)l; 101 } else 102 context = 3; 103 break; 104 case 'D': 105 format = D_IFDEF; 106 ifdefname = optarg; 107 break; 108 case 'e': 109 format = D_EDIT; 110 break; 111 case 'f': 112 format = D_REVERSE; 113 break; 114 case 'h': 115 /* silently ignore for backwards compatibility */ 116 break; 117 case 'i': 118 iflag = 1; 119 break; 120 case 'N': 121 Nflag = 1; 122 break; 123 case 'n': 124 format = D_NREVERSE; 125 break; 126 case 'P': 127 Pflag = 1; 128 break; 129 case 'r': 130 rflag = 1; 131 break; 132 case 'q': 133 format = D_BRIEF; 134 break; 135 case 'S': 136 start = optarg; 137 break; 138 case 's': 139 sflag = 1; 140 break; 141 case 't': 142 tflag = 1; 143 break; 144 case 'U': 145 case 'u': 146 format = D_UNIFIED; 147 if (optarg != NULL) { 148 l = strtol(optarg, &ep, 10); 149 if (*ep != '\0' || l < 0 || l >= INT_MAX) 150 usage(); 151 context = (int)l; 152 } else 153 context = 3; 154 break; 155 case 'w': 156 wflag = 1; 157 break; 158 case 'X': 159 read_excludes_file(optarg); 160 break; 161 case 'x': 162 push_excludes(optarg); 163 break; 164 default: 165 usage(); 166 break; 167 } 168 } 169 argc -= optind; 170 argv += optind; 171 172 /* 173 * Do sanity checks, fill in stb1 and stb2 and call the appropriate 174 * driver routine. Both drivers use the contents of stb1 and stb2. 175 */ 176 if (argc != 2) 177 usage(); 178 if (strcmp(argv[0], "-") == 0) { 179 stb1.st_mode = S_IFREG; 180 gotstdin = 1; 181 } else if (stat(argv[0], &stb1) != 0) 182 error("%s", argv[0]); 183 if (strcmp(argv[1], "-") == 0) { 184 stb2.st_mode = S_IFREG; 185 gotstdin = 1; 186 } else if (stat(argv[1], &stb2) != 0) 187 error("%s", argv[1]); 188 if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode))) 189 errorx("can't compare - to a directory"); 190 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { 191 if (format == D_IFDEF) 192 errorx("-D option not supported with directories"); 193 set_argstr(oargv, argv); 194 diffdir(argv[0], argv[1]); 195 } else 196 diffreg(argv[0], argv[1], 0); 197 exit(status); 198 } 199 200 void 201 quit(int signo) 202 { 203 if (tempfiles[0] != NULL) 204 unlink(tempfiles[0]); 205 if (tempfiles[1] != NULL) 206 unlink(tempfiles[1]); 207 _exit(status); 208 } 209 210 void * 211 emalloc(size_t n) 212 { 213 void *p; 214 215 if ((p = malloc(n)) == NULL) 216 error(NULL); 217 return (p); 218 } 219 220 void * 221 erealloc(void *p, size_t n) 222 { 223 void *q; 224 225 if ((q = realloc(p, n)) == NULL) 226 error(NULL); 227 return (q); 228 } 229 230 __dead void 231 error(const char *fmt, ...) 232 { 233 va_list ap; 234 int sverrno = errno; 235 236 if (tempfiles[0] != NULL) 237 unlink(tempfiles[0]); 238 if (tempfiles[1] != NULL) 239 unlink(tempfiles[1]); 240 errno = sverrno; 241 va_start(ap, fmt); 242 verr(2, fmt, ap); 243 va_end(ap); 244 } 245 246 __dead void 247 errorx(const char *fmt, ...) 248 { 249 va_list ap; 250 251 if (tempfiles[0] != NULL) 252 unlink(tempfiles[0]); 253 if (tempfiles[1] != NULL) 254 unlink(tempfiles[1]); 255 va_start(ap, fmt); 256 verrx(2, fmt, ap); 257 va_end(ap); 258 } 259 260 void 261 set_argstr(char **av, char **ave) 262 { 263 size_t argsize; 264 char **ap; 265 266 argsize = 4 + (char *)ave - (char *)av + 1; 267 diffargs = emalloc(argsize); 268 strlcpy(diffargs, "diff", argsize); 269 for (ap = av + 1; ap < ave; ap++) { 270 if (strcmp(*ap, "--") != 0) { 271 strlcat(diffargs, " ", argsize); 272 strlcat(diffargs, *ap, argsize); 273 } 274 } 275 } 276 277 /* 278 * Read in an excludes file and push each line. 279 */ 280 void 281 read_excludes_file(char *file) 282 { 283 FILE *fp; 284 char *buf, *pattern; 285 size_t len; 286 287 if (strcmp(file, "-") == 0) 288 fp = stdin; 289 else if ((fp = fopen(file, "r")) == NULL) 290 error("%s", file); 291 while ((buf = fgetln(fp, &len)) != NULL) { 292 if (buf[len - 1] == '\n') 293 len--; 294 pattern = emalloc(len + 1); 295 memcpy(pattern, buf, len); 296 pattern[len] = '\0'; 297 push_excludes(pattern); 298 } 299 if (strcmp(file, "-") != 0) 300 fclose(fp); 301 } 302 303 /* 304 * Push a pattern onto the excludes list. 305 */ 306 void 307 push_excludes(char *pattern) 308 { 309 struct excludes *entry; 310 311 entry = emalloc(sizeof(*entry)); 312 entry->pattern = pattern; 313 entry->next = excludes_list; 314 excludes_list = entry; 315 } 316 317 __dead void 318 usage(void) 319 { 320 (void)fprintf(stderr, 321 "usage: diff [-biqtw] [-c | -e | -f | -n | -u ] file1 file2\n" 322 " diff [-biqtw] -C number file1 file2\n" 323 " diff [-biqtw] -D string file1 file2\n" 324 " diff [-biqtw] -U number file1 file2\n" 325 " diff [-biNPqwt] [-c | -e | -f | -n | -u ] [-r] [-s] [-S name]" 326 " [-X file]\n [-x pattern] dir1 dir2\n"); 327 328 exit(2); 329 } 330