Annotation of src/usr.bin/cmp/cmp.c, Revision 1.19
1.19 ! deraadt 1: /* $OpenBSD: cmp.c,v 1.18 2018/03/05 16:57:37 cheloha Exp $ */
1.1 deraadt 2: /* $NetBSD: cmp.c,v 1.7 1995/09/08 03:22:56 tls Exp $ */
3:
4: /*
5: * Copyright (c) 1987, 1990, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.10 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #include <sys/types.h>
34: #include <sys/stat.h>
35:
36: #include <err.h>
1.18 cheloha 37: #include <errno.h>
1.1 deraadt 38: #include <fcntl.h>
1.18 cheloha 39: #include <limits.h>
1.1 deraadt 40: #include <stdio.h>
41: #include <stdlib.h>
42: #include <string.h>
43: #include <unistd.h>
44:
45: #include "extern.h"
46:
47: int lflag, sflag;
48:
1.18 cheloha 49: static off_t get_skip(const char *, const char *);
1.16 schwarze 50: static void __dead usage(void);
1.1 deraadt 51:
52: int
1.11 deraadt 53: main(int argc, char *argv[])
1.1 deraadt 54: {
55: struct stat sb1, sb2;
56: off_t skip1, skip2;
57: int ch, fd1, fd2, special;
58: char *file1, *file2;
59:
1.13 doug 60: if (pledge("stdio rpath", NULL) == -1)
1.14 gsoares 61: err(ERR_EXIT, "pledge");
1.13 doug 62:
1.5 millert 63: while ((ch = getopt(argc, argv, "ls")) != -1)
1.1 deraadt 64: switch (ch) {
65: case 'l': /* print all differences */
66: lflag = 1;
67: break;
68: case 's': /* silent run */
69: sflag = 1;
70: break;
71: default:
72: usage();
73: }
1.8 mickey 74:
1.1 deraadt 75: argv += optind;
76: argc -= optind;
77:
78: if (lflag && sflag)
79: errx(ERR_EXIT, "only one of -l and -s may be specified");
80:
81: if (argc < 2 || argc > 4)
82: usage();
83:
84: /* Backward compatibility -- handle "-" meaning stdin. */
85: special = 0;
86: if (strcmp(file1 = argv[0], "-") == 0) {
87: special = 1;
88: fd1 = 0;
89: file1 = "stdin";
1.19 ! deraadt 90: } else if ((fd1 = open(file1, O_RDONLY)) == -1)
1.17 cheloha 91: fatal("%s", file1);
1.1 deraadt 92: if (strcmp(file2 = argv[1], "-") == 0) {
1.17 cheloha 93: if (special)
94: fatalx("standard input may only be specified once");
1.1 deraadt 95: special = 1;
96: fd2 = 0;
97: file2 = "stdin";
1.19 ! deraadt 98: } else if ((fd2 = open(file2, O_RDONLY)) == -1)
1.17 cheloha 99: fatal("%s", file2);
1.13 doug 100:
101: if (pledge("stdio", NULL) == -1)
1.14 gsoares 102: err(ERR_EXIT, "pledge");
1.1 deraadt 103:
1.18 cheloha 104: skip1 = (argc > 2) ? get_skip(argv[2], "skip1") : 0;
105: skip2 = (argc == 4) ? get_skip(argv[3], "skip2") : 0;
1.1 deraadt 106:
107: if (!special) {
1.17 cheloha 108: if (fstat(fd1, &sb1) == -1)
109: fatal("%s", file1);
1.1 deraadt 110: if (!S_ISREG(sb1.st_mode))
111: special = 1;
112: else {
1.17 cheloha 113: if (fstat(fd2, &sb2) == -1)
114: fatal("%s", file2);
1.1 deraadt 115: if (!S_ISREG(sb2.st_mode))
116: special = 1;
117: }
118: }
119:
120: if (special)
121: c_special(fd1, file1, skip1, fd2, file2, skip2);
122: else
123: c_regular(fd1, file1, skip1, sb1.st_size,
124: fd2, file2, skip2, sb2.st_size);
1.3 michaels 125: return 0;
1.18 cheloha 126: }
127:
128: static off_t
129: get_skip(const char *arg, const char *name)
130: {
131: off_t skip;
132: char *ep;
133:
134: errno = 0;
135: skip = strtoll(arg, &ep, 0);
136: if (arg[0] == '\0' || *ep != '\0')
137: fatalx("%s is invalid: %s", name, arg);
138: if (skip < 0)
139: fatalx("%s is too small: %s", name, arg);
140: if (skip == LLONG_MAX && errno == ERANGE)
141: fatalx("%s is too large: %s", name, arg);
142: return skip;
1.1 deraadt 143: }
144:
1.16 schwarze 145: static void __dead
1.11 deraadt 146: usage(void)
1.1 deraadt 147: {
148:
149: (void)fprintf(stderr,
1.7 deraadt 150: "usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n");
1.1 deraadt 151: exit(ERR_EXIT);
152: }
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