1 /* $OpenBSD: diff.c,v 1.68 2023/01/05 00:00:44 millert Exp $ */
2
3 /*
4 * Copyright (c) 2003 Todd C. Miller <millert@openbsd.org>
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/stat.h>
24
25 #include <ctype.h>
26 #include <err.h>
27 #include <errno.h>
28 #include <getopt.h>
29 #include <stdlib.h>
30 #include <stdio.h>
31 #include <stdarg.h>
32 #include <string.h>
33 #include <unistd.h>
34 #include <limits.h>
35
36 #include "diff.h"
37 #include "xmalloc.h"
38
39 static const char diff_version[] = "DragonFlyBSD diff 20240601";
40 int Nflag, Pflag, rflag, sflag, Tflag;
41 int diff_format, diff_context, status;
42 char *start, *ifdefname, *diffargs, *label[2], *ignore_pats;
43 struct stat stb1, stb2;
44 struct excludes *excludes_list;
45 regex_t ignore_re;
46
47 #define OPTIONS "0123456789abC:cdD:efhI:iL:nNPpqrS:sTtU: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 { "minimal", no_argument, 0, 'd' },
54 { "ed", no_argument, 0, 'e' },
55 { "forward-ed", no_argument, 0, 'f' },
56 { "ignore-matching-lines", required_argument, 0, 'I' },
57 { "ignore-case", no_argument, 0, 'i' },
58 { "label", required_argument, 0, 'L' },
59 { "new-file", no_argument, 0, 'N' },
60 { "rcs", no_argument, 0, 'n' },
61 { "unidirectional-new-file", no_argument, 0, 'P' },
62 { "show-c-function", no_argument, 0, 'p' },
63 { "brief", no_argument, 0, 'q' },
64 { "recursive", no_argument, 0, 'r' },
65 { "report-identical-files", no_argument, 0, 's' },
66 { "starting-file", required_argument, 0, 'S' },
67 { "expand-tabs", no_argument, 0, 't' },
68 { "initial-tab", no_argument, 0, 'T' },
69 { "unified", optional_argument, 0, 'U' },
70 { "ignore-all-space", no_argument, 0, 'w' },
71 { "exclude", required_argument, 0, 'x' },
72 { "exclude-from", required_argument, 0, 'X' },
73 { NULL, 0, 0, '\0'}
74 };
75
76 void usage(void);
77 void push_excludes(char *);
78 void push_ignore_pats(char *);
79 void read_excludes_file(char *file);
80 void set_argstr(char **, char **);
81
82 int
main(int argc,char ** argv)83 main(int argc, char **argv)
84 {
85 char *ep, **oargv;
86 long l;
87 int ch, dflags, lastch, gotstdin, prevoptind, newarg;
88
89 oargv = argv;
90 gotstdin = 0;
91 dflags = 0;
92 lastch = '\0';
93 prevoptind = 1;
94 newarg = 1;
95 while ((ch = getopt_long(argc, argv, OPTIONS, longopts, NULL)) != -1) {
96 switch (ch) {
97 case '0': case '1': case '2': case '3': case '4':
98 case '5': case '6': case '7': case '8': case '9':
99 if (newarg)
100 usage(); /* disallow -[0-9]+ */
101 else if (lastch == 'c' || lastch == 'u')
102 diff_context = 0;
103 else if (!isdigit(lastch) || diff_context > INT_MAX / 10)
104 usage();
105 diff_context = (diff_context * 10) + (ch - '0');
106 break;
107 case 'a':
108 dflags |= D_FORCEASCII;
109 break;
110 case 'b':
111 dflags |= D_FOLDBLANKS;
112 break;
113 case 'C':
114 case 'c':
115 diff_format = D_CONTEXT;
116 if (optarg != NULL) {
117 l = strtol(optarg, &ep, 10);
118 if (*ep != '\0' || l < 0 || l >= INT_MAX)
119 usage();
120 diff_context = (int)l;
121 } else
122 diff_context = 3;
123 break;
124 case 'd':
125 dflags |= D_MINIMAL;
126 break;
127 case 'D':
128 diff_format = D_IFDEF;
129 ifdefname = optarg;
130 break;
131 case 'e':
132 diff_format = D_EDIT;
133 break;
134 case 'f':
135 diff_format = D_REVERSE;
136 break;
137 case 'h':
138 /* silently ignore for backwards compatibility */
139 break;
140 case 'I':
141 push_ignore_pats(optarg);
142 break;
143 case 'i':
144 dflags |= D_IGNORECASE;
145 break;
146 case 'L':
147 if (label[0] == NULL)
148 label[0] = optarg;
149 else if (label[1] == NULL)
150 label[1] = optarg;
151 else
152 usage();
153 break;
154 case 'N':
155 Nflag = 1;
156 break;
157 case 'n':
158 diff_format = D_NREVERSE;
159 break;
160 case 'p':
161 dflags |= D_PROTOTYPE;
162 break;
163 case 'P':
164 Pflag = 1;
165 break;
166 case 'r':
167 rflag = 1;
168 break;
169 case 'q':
170 diff_format = D_BRIEF;
171 break;
172 case 'S':
173 start = optarg;
174 break;
175 case 's':
176 sflag = 1;
177 break;
178 case 'T':
179 Tflag = 1;
180 break;
181 case 't':
182 dflags |= D_EXPANDTABS;
183 break;
184 case 'U':
185 case 'u':
186 diff_format = D_UNIFIED;
187 if (optarg != NULL) {
188 l = strtol(optarg, &ep, 10);
189 if (*ep != '\0' || l < 0 || l >= INT_MAX)
190 usage();
191 diff_context = (int)l;
192 } else
193 diff_context = 3;
194 break;
195 case 'v':
196 printf("%s\n", diff_version);
197 exit(0);
198 case 'w':
199 dflags |= D_IGNOREBLANKS;
200 break;
201 case 'X':
202 read_excludes_file(optarg);
203 break;
204 case 'x':
205 push_excludes(optarg);
206 break;
207 default:
208 usage();
209 break;
210 }
211 lastch = ch;
212 newarg = optind != prevoptind;
213 prevoptind = optind;
214 }
215 argc -= optind;
216 argv += optind;
217
218 /*
219 * Do sanity checks, fill in stb1 and stb2 and call the appropriate
220 * driver routine. Both drivers use the contents of stb1 and stb2.
221 */
222 if (argc != 2)
223 usage();
224 if (ignore_pats != NULL) {
225 char buf[BUFSIZ];
226 int error;
227
228 if ((error = regcomp(&ignore_re, ignore_pats,
229 REG_NEWLINE | REG_EXTENDED)) != 0) {
230 regerror(error, &ignore_re, buf, sizeof(buf));
231 if (*ignore_pats != '\0')
232 errx(2, "%s: %s", ignore_pats, buf);
233 else
234 errx(2, "%s", buf);
235 }
236 }
237 if (strcmp(argv[0], "-") == 0) {
238 fstat(STDIN_FILENO, &stb1);
239 gotstdin = 1;
240 } else if (stat(argv[0], &stb1) != 0)
241 err(2, "%s", argv[0]);
242 if (strcmp(argv[1], "-") == 0) {
243 fstat(STDIN_FILENO, &stb2);
244 gotstdin = 1;
245 } else if (stat(argv[1], &stb2) != 0)
246 err(2, "%s", argv[1]);
247 if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode)))
248 errx(2, "can't compare - to a directory");
249 set_argstr(oargv, argv);
250 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
251 if (diff_format == D_IFDEF)
252 errx(2, "-D option not supported with directories");
253 diffdir(argv[0], argv[1], dflags);
254 } else {
255 if (S_ISDIR(stb1.st_mode)) {
256 argv[0] = splice(argv[0], argv[1]);
257 if (stat(argv[0], &stb1) == -1)
258 err(2, "%s", argv[0]);
259 }
260 if (S_ISDIR(stb2.st_mode)) {
261 argv[1] = splice(argv[1], argv[0]);
262 if (stat(argv[1], &stb2) == -1)
263 err(2, "%s", argv[1]);
264 }
265 print_status(diffreg(argv[0], argv[1], dflags), argv[0], argv[1],
266 "");
267 }
268 exit(status);
269 }
270
271 void
set_argstr(char ** av,char ** ave)272 set_argstr(char **av, char **ave)
273 {
274 size_t argsize;
275 char **ap;
276
277 argsize = 4 + *ave - *av + 1;
278 diffargs = xmalloc(argsize);
279 strlcpy(diffargs, "diff", argsize);
280 for (ap = av + 1; ap < ave; ap++) {
281 if (strcmp(*ap, "--") != 0) {
282 strlcat(diffargs, " ", argsize);
283 strlcat(diffargs, *ap, argsize);
284 }
285 }
286 }
287
288 /*
289 * Read in an excludes file and push each line.
290 */
291 void
read_excludes_file(char * file)292 read_excludes_file(char *file)
293 {
294 FILE *fp;
295 char *buf, *pattern;
296 size_t len;
297
298 if (strcmp(file, "-") == 0)
299 fp = stdin;
300 else if ((fp = fopen(file, "r")) == NULL)
301 err(2, "%s", file);
302 while ((buf = fgetln(fp, &len)) != NULL) {
303 if (buf[len - 1] == '\n')
304 len--;
305 pattern = xmalloc(len + 1);
306 memcpy(pattern, buf, len);
307 pattern[len] = '\0';
308 push_excludes(pattern);
309 }
310 if (strcmp(file, "-") != 0)
311 fclose(fp);
312 }
313
314 /*
315 * Push a pattern onto the excludes list.
316 */
317 void
push_excludes(char * pattern)318 push_excludes(char *pattern)
319 {
320 struct excludes *entry;
321
322 entry = xmalloc(sizeof(*entry));
323 entry->pattern = pattern;
324 entry->next = excludes_list;
325 excludes_list = entry;
326 }
327
328 void
push_ignore_pats(char * pattern)329 push_ignore_pats(char *pattern)
330 {
331 size_t len;
332
333 if (ignore_pats == NULL)
334 ignore_pats = xstrdup(pattern);
335 else {
336 /* old + "|" + new + NUL */
337 len = strlen(ignore_pats) + strlen(pattern) + 2;
338 ignore_pats = xreallocarray(ignore_pats, 1, len);
339 strlcat(ignore_pats, "|", len);
340 strlcat(ignore_pats, pattern, len);
341 }
342 }
343
344 void
print_only(const char * path,size_t dirlen,const char * entry)345 print_only(const char *path, size_t dirlen, const char *entry)
346 {
347 if (dirlen > 1)
348 dirlen--;
349 printf("Only in %.*s: %s\n", (int)dirlen, path, entry);
350 }
351
352 void
print_status(int val,char * path1,char * path2,const char * entry)353 print_status(int val, char *path1, char *path2, const char *entry)
354 {
355 switch (val) {
356 case D_BINARY:
357 printf("Binary files %s%s and %s%s differ\n",
358 path1, entry, path2, entry);
359 break;
360 case D_DIFFER:
361 if (diff_format == D_BRIEF)
362 printf("Files %s%s and %s%s differ\n",
363 path1, entry, path2, entry);
364 break;
365 case D_SAME:
366 if (sflag)
367 printf("Files %s%s and %s%s are identical\n",
368 path1, entry, path2, entry);
369 break;
370 case D_MISMATCH1:
371 printf("File %s%s is a directory while file %s%s is a regular file\n",
372 path1, entry, path2, entry);
373 break;
374 case D_MISMATCH2:
375 printf("File %s%s is a regular file while file %s%s is a directory\n",
376 path1, entry, path2, entry);
377 break;
378 case D_SKIPPED1:
379 printf("File %s%s is not a regular file or directory and was skipped\n",
380 path1, entry);
381 break;
382 case D_SKIPPED2:
383 printf("File %s%s is not a regular file or directory and was skipped\n",
384 path2, entry);
385 break;
386 }
387 }
388
389 void
usage(void)390 usage(void)
391 {
392 (void)fprintf(stderr,
393 "usage: diff [-abdipTtw] [-c | -e | -f | -n | -q | -u] [-I pattern] [-L label]\n"
394 " file1 file2\n"
395 " diff [-abdipTtw] [-I pattern] [-L label] -C number file1 file2\n"
396 " diff [-abditw] [-I pattern] -D string file1 file2\n"
397 " diff [-abdipTtw] [-I pattern] [-L label] -U number file1 file2\n"
398 " diff [-abdiNPprsTtw] [-c | -e | -f | -n | -q | -u] [-I pattern]\n"
399 " [-L label] [-S name] [-X file] [-x pattern] dir1 dir2\n");
400
401 exit(2);
402 }
403