Annotation of src/usr.bin/cmp/cmp.c, Revision 1.17
1.17 ! cheloha 1: /* $OpenBSD: cmp.c,v 1.16 2016/10/28 07:22:59 schwarze 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>
37: #include <fcntl.h>
38: #include <stdio.h>
39: #include <stdlib.h>
40: #include <string.h>
41: #include <unistd.h>
42:
43: #include "extern.h"
44:
45: int lflag, sflag;
46:
1.16 schwarze 47: static void __dead usage(void);
1.1 deraadt 48:
49: int
1.11 deraadt 50: main(int argc, char *argv[])
1.1 deraadt 51: {
52: struct stat sb1, sb2;
53: off_t skip1, skip2;
54: int ch, fd1, fd2, special;
55: char *file1, *file2;
56:
1.13 doug 57: if (pledge("stdio rpath", NULL) == -1)
1.14 gsoares 58: err(ERR_EXIT, "pledge");
1.13 doug 59:
1.5 millert 60: while ((ch = getopt(argc, argv, "ls")) != -1)
1.1 deraadt 61: switch (ch) {
62: case 'l': /* print all differences */
63: lflag = 1;
64: break;
65: case 's': /* silent run */
66: sflag = 1;
67: break;
68: default:
69: usage();
70: }
1.8 mickey 71:
1.1 deraadt 72: argv += optind;
73: argc -= optind;
74:
75: if (lflag && sflag)
76: errx(ERR_EXIT, "only one of -l and -s may be specified");
77:
78: if (argc < 2 || argc > 4)
79: usage();
80:
81: /* Backward compatibility -- handle "-" meaning stdin. */
82: special = 0;
83: if (strcmp(file1 = argv[0], "-") == 0) {
84: special = 1;
85: fd1 = 0;
86: file1 = "stdin";
1.17 ! cheloha 87: } else if ((fd1 = open(file1, O_RDONLY, 0)) == -1)
! 88: fatal("%s", file1);
1.1 deraadt 89: if (strcmp(file2 = argv[1], "-") == 0) {
1.17 ! cheloha 90: if (special)
! 91: fatalx("standard input may only be specified once");
1.1 deraadt 92: special = 1;
93: fd2 = 0;
94: file2 = "stdin";
1.17 ! cheloha 95: } else if ((fd2 = open(file2, O_RDONLY, 0)) == -1)
! 96: fatal("%s", file2);
1.13 doug 97:
98: if (pledge("stdio", NULL) == -1)
1.14 gsoares 99: err(ERR_EXIT, "pledge");
1.1 deraadt 100:
1.15 guenther 101: skip1 = argc > 2 ? strtoll(argv[2], NULL, 0) : 0;
102: skip2 = argc == 4 ? strtoll(argv[3], NULL, 0) : 0;
1.1 deraadt 103:
104: if (!special) {
1.17 ! cheloha 105: if (fstat(fd1, &sb1) == -1)
! 106: fatal("%s", file1);
1.1 deraadt 107: if (!S_ISREG(sb1.st_mode))
108: special = 1;
109: else {
1.17 ! cheloha 110: if (fstat(fd2, &sb2) == -1)
! 111: fatal("%s", file2);
1.1 deraadt 112: if (!S_ISREG(sb2.st_mode))
113: special = 1;
114: }
115: }
116:
117: if (special)
118: c_special(fd1, file1, skip1, fd2, file2, skip2);
119: else
120: c_regular(fd1, file1, skip1, sb1.st_size,
121: fd2, file2, skip2, sb2.st_size);
1.3 michaels 122: return 0;
1.1 deraadt 123: }
124:
1.16 schwarze 125: static void __dead
1.11 deraadt 126: usage(void)
1.1 deraadt 127: {
128:
129: (void)fprintf(stderr,
1.7 deraadt 130: "usage: cmp [-l | -s] file1 file2 [skip1 [skip2]]\n");
1.1 deraadt 131: exit(ERR_EXIT);
132: }
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