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94721995 KB |
1 | /* |
2 | * Copyright (c) 1987 Regents of the University of California. | |
cde75055 KB |
3 | * All rights reserved. |
4 | * | |
f15db449 | 5 | * %sccs.include.redist.c% |
94721995 KB |
6 | */ |
7 | ||
8 | #ifndef lint | |
9 | char copyright[] = | |
152df645 | 10 | "@(#) Copyright (c) 1987, 1990 Regents of the University of California.\n\ |
94721995 | 11 | All rights reserved.\n"; |
b8c620d6 | 12 | #endif /* not lint */ |
94721995 KB |
13 | |
14 | #ifndef lint | |
409b7fd4 | 15 | static char sccsid[] = "@(#)cmp.c 5.6 (Berkeley) %G%"; |
b8c620d6 | 16 | #endif /* not lint */ |
34cbacef | 17 | |
dd197a33 | 18 | #include <sys/types.h> |
34cbacef | 19 | #include <sys/stat.h> |
51ea332c KB |
20 | #include <fcntl.h> |
21 | #include <errno.h> | |
22 | #include <unistd.h> | |
1b88b85d | 23 | #include <stdio.h> |
51ea332c KB |
24 | #include <stdlib.h> |
25 | #include <string.h> | |
dd197a33 | 26 | #include "extern.h" |
1b88b85d | 27 | |
dd197a33 | 28 | int lflag, sflag; |
1b88b85d | 29 | |
dd197a33 | 30 | static void usage __P((void)); |
51ea332c | 31 | |
ec37e2d9 | 32 | main(argc, argv) |
1b7289a3 | 33 | int argc; |
152df645 | 34 | char *argv[]; |
1b88b85d | 35 | { |
dd197a33 KB |
36 | struct stat sb1, sb2; |
37 | off_t skip1, skip2; | |
38 | int ch, fd1, fd2, special; | |
39 | char *file1, *file2; | |
34cbacef | 40 | |
1b7289a3 | 41 | while ((ch = getopt(argc, argv, "-ls")) != EOF) |
152df645 | 42 | switch (ch) { |
ec37e2d9 | 43 | case 'l': /* print all differences */ |
dd197a33 | 44 | lflag = 1; |
ec37e2d9 KB |
45 | break; |
46 | case 's': /* silent run */ | |
dd197a33 | 47 | sflag = 1; |
ec37e2d9 | 48 | break; |
dd197a33 | 49 | case '-': /* stdin (must be after options) */ |
1b7289a3 KB |
50 | --optind; |
51 | goto endargs; | |
ec37e2d9 KB |
52 | case '?': |
53 | default: | |
54 | usage(); | |
34cbacef | 55 | } |
1b7289a3 | 56 | endargs: |
34cbacef KB |
57 | argv += optind; |
58 | argc -= optind; | |
1b88b85d | 59 | |
dd197a33 KB |
60 | if (lflag && sflag) |
61 | err("only one of -l and -s may be specified"); | |
62 | ||
34cbacef KB |
63 | if (argc < 2 || argc > 4) |
64 | usage(); | |
65 | ||
dd197a33 KB |
66 | /* Backward compatibility -- handle "-" meaning stdin. */ |
67 | special = 0; | |
68 | if (strcmp(file1 = argv[0], "-") == 0) { | |
69 | special = 1; | |
1b7289a3 | 70 | fd1 = 0; |
dd197a33 KB |
71 | file1 = "stdin"; |
72 | } | |
1b7289a3 | 73 | else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) |
dd197a33 KB |
74 | err("%s: %s", file1, strerror(errno)); |
75 | if (strcmp(file2 = argv[1], "-") == 0) { | |
76 | if (special) | |
77 | err("standard input may only be specified once"); | |
78 | special = 1; | |
1b7289a3 | 79 | fd2 = 0; |
dd197a33 | 80 | file2 = "stdin"; |
1b88b85d | 81 | } |
dd197a33 KB |
82 | else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) |
83 | err("%s: %s", file2, strerror(errno)); | |
84 | ||
85 | skip1 = argc > 2 ? strtol(argv[2], NULL, 10) : 0; | |
86 | skip2 = argc == 4 ? strtol(argv[3], NULL, 10) : 0; | |
87 | ||
88 | if (!special) { | |
89 | if (fstat(fd1, &sb1)) | |
90 | err("%s: %s", file1, strerror(errno)); | |
91 | if (!S_ISREG(sb1.st_mode)) | |
92 | special = 1; | |
93 | else { | |
94 | if (fstat(fd2, &sb2)) | |
95 | err("%s: %s", file2, strerror(errno)); | |
96 | if (!S_ISREG(sb2.st_mode)) | |
97 | special = 1; | |
34cbacef | 98 | } |
1b88b85d | 99 | } |
ec37e2d9 | 100 | |
dd197a33 KB |
101 | if (special) |
102 | c_special(fd1, file1, skip1, fd2, file2, skip2); | |
103 | else | |
104 | c_regular(fd1, file1, skip1, sb1.st_size, | |
105 | fd2, file2, skip2, sb2.st_size); | |
106 | exit(0); | |
ec37e2d9 KB |
107 | } |
108 | ||
dd197a33 | 109 | static void |
34cbacef | 110 | usage() |
1b88b85d | 111 | { |
51ea332c | 112 | (void)fprintf(stderr, |
409b7fd4 | 113 | "usage: cmp [-l | s] file1 file2 [skip1 [skip2]]\n"); |
dd197a33 | 114 | exit(2); |
1b88b85d | 115 | } |