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32 #include <sys/types.h>
35 #include <capsicum_helpers.h>
50 bool bflag, lflag, sflag, xflag, zflag;
52 static const struct option long_opts[] =
54 {"print-bytes", no_argument, NULL, 'b'},
55 {"ignore-initial", required_argument, NULL, 'i'},
56 {"verbose", no_argument, NULL, 'l'},
57 {"bytes", required_argument, NULL, 'n'},
58 {"silent", no_argument, NULL, 's'},
59 {"quiet", no_argument, NULL, 's'},
60 {NULL, no_argument, NULL, 0}
64 volatile sig_atomic_t info;
74 static void usage(void) __dead2;
77 parse_iskipspec(char *spec, off_t *skip1, off_t *skip2)
81 colon = strchr(spec, ':');
85 if (expand_number(spec, skip1) < 0)
89 return (expand_number(colon, skip2) == 0);
96 main(int argc, char *argv[])
99 off_t skip1, skip2, limit;
100 int ch, fd1, fd2, oflag;
102 const char *file1, *file2;
104 limit = skip1 = skip2 = 0;
106 while ((ch = getopt_long(argc, argv, "+bhi:ln:sxz", long_opts, NULL)) != -1)
108 case 'b': /* Print bytes */
111 case 'h': /* Don't follow symlinks */
115 if (!parse_iskipspec(optarg, &skip1, &skip2)) {
117 "Invalid --ignore-initial: %s\n",
122 case 'l': /* print all differences */
125 case 'n': /* Limit */
126 if (expand_number(optarg, &limit) < 0 || limit < 0) {
127 fprintf(stderr, "Invalid --bytes: %s\n",
132 case 's': /* silent run */
135 case 'x': /* hex output */
139 case 'z': /* compare size first */
150 errx(ERR_EXIT, "specifying -s with -l or -x is not permitted");
152 if (argc < 2 || argc > 4)
155 /* Don't limit rights on stdin since it may be one of the inputs. */
156 if (caph_limit_stream(STDOUT_FILENO, CAPH_WRITE | CAPH_IGNORE_EBADF))
157 err(ERR_EXIT, "unable to limit rights on stdout");
158 if (caph_limit_stream(STDERR_FILENO, CAPH_WRITE | CAPH_IGNORE_EBADF))
159 err(ERR_EXIT, "unable to limit rights on stderr");
161 /* Backward compatibility -- handle "-" meaning stdin. */
163 if (strcmp(file1 = argv[0], "-") == 0) {
167 } else if ((fd1 = open(file1, oflag, 0)) < 0 && errno != EMLINK) {
169 err(ERR_EXIT, "%s", file1);
173 if (strcmp(file2 = argv[1], "-") == 0) {
176 "standard input may only be specified once");
180 } else if ((fd2 = open(file2, oflag, 0)) < 0 && errno != EMLINK) {
182 err(ERR_EXIT, "%s", file2);
187 if (argc > 2 && expand_number(argv[2], &skip1) < 0) {
188 fprintf(stderr, "Invalid skip1: %s\n", argv[2]);
192 if (argc == 4 && expand_number(argv[3], &skip2) < 0) {
193 fprintf(stderr, "Invalid skip2: %s\n", argv[3]);
197 if (sflag && skip1 == 0 && skip2 == 0)
202 c_link(file1, skip1, file2, skip2, limit);
205 errx(ERR_EXIT, "%s: Not a symbolic link", file2);
208 } else if (fd2 == -1) {
210 errx(ERR_EXIT, "%s: Not a symbolic link", file1);
215 /* FD rights are limited in c_special() and c_regular(). */
216 caph_cache_catpages();
219 if (fstat(fd1, &sb1)) {
221 err(ERR_EXIT, "%s", file1);
225 if (!S_ISREG(sb1.st_mode))
228 if (fstat(fd2, &sb2)) {
230 err(ERR_EXIT, "%s", file2);
234 if (!S_ISREG(sb2.st_mode))
240 (void)signal(SIGINFO, siginfo);
243 c_special(fd1, file1, skip1, fd2, file2, skip2, limit);
245 if (zflag && sb1.st_size != sb2.st_size) {
247 (void) printf("%s %s differ: size\n",
251 c_regular(fd1, file1, skip1, sb1.st_size,
252 fd2, file2, skip2, sb2.st_size, limit);
261 (void)fprintf(stderr,
262 "usage: cmp [-l | -s | -x] [-hz] file1 file2 [skip1 [skip2]]\n");