Commit | Line | Data |
---|---|---|
94721995 | 1 | /* |
e5824735 KB |
2 | * Copyright (c) 1987, 1990, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
cde75055 | 4 | * |
f15db449 | 5 | * %sccs.include.redist.c% |
94721995 KB |
6 | */ |
7 | ||
8 | #ifndef lint | |
e5824735 KB |
9 | static char copyright[] = |
10 | "@(#) Copyright (c) 1987, 1990, 1993\n\ | |
11 | The Regents of the University of California. All rights reserved.\n"; | |
b8c620d6 | 12 | #endif /* not lint */ |
94721995 KB |
13 | |
14 | #ifndef lint | |
c3afbeb5 | 15 | static char sccsid[] = "@(#)cmp.c 8.2 (Berkeley) %G%"; |
b8c620d6 | 16 | #endif /* not lint */ |
34cbacef | 17 | |
dd197a33 | 18 | #include <sys/types.h> |
34cbacef | 19 | #include <sys/stat.h> |
c3afbeb5 JSP |
20 | |
21 | #include <err.h> | |
51ea332c | 22 | #include <fcntl.h> |
1b88b85d | 23 | #include <stdio.h> |
51ea332c KB |
24 | #include <stdlib.h> |
25 | #include <string.h> | |
c3afbeb5 JSP |
26 | #include <unistd.h> |
27 | ||
dd197a33 | 28 | #include "extern.h" |
1b88b85d | 29 | |
dd197a33 | 30 | int lflag, sflag; |
1b88b85d | 31 | |
dd197a33 | 32 | static void usage __P((void)); |
51ea332c | 33 | |
c3afbeb5 | 34 | int |
ec37e2d9 | 35 | main(argc, argv) |
1b7289a3 | 36 | int argc; |
152df645 | 37 | char *argv[]; |
1b88b85d | 38 | { |
dd197a33 KB |
39 | struct stat sb1, sb2; |
40 | off_t skip1, skip2; | |
41 | int ch, fd1, fd2, special; | |
42 | char *file1, *file2; | |
34cbacef | 43 | |
1b7289a3 | 44 | while ((ch = getopt(argc, argv, "-ls")) != EOF) |
152df645 | 45 | switch (ch) { |
ec37e2d9 | 46 | case 'l': /* print all differences */ |
dd197a33 | 47 | lflag = 1; |
ec37e2d9 KB |
48 | break; |
49 | case 's': /* silent run */ | |
dd197a33 | 50 | sflag = 1; |
ec37e2d9 | 51 | break; |
dd197a33 | 52 | case '-': /* stdin (must be after options) */ |
1b7289a3 KB |
53 | --optind; |
54 | goto endargs; | |
ec37e2d9 KB |
55 | case '?': |
56 | default: | |
57 | usage(); | |
34cbacef | 58 | } |
1b7289a3 | 59 | endargs: |
34cbacef KB |
60 | argv += optind; |
61 | argc -= optind; | |
1b88b85d | 62 | |
dd197a33 | 63 | if (lflag && sflag) |
c3afbeb5 | 64 | errx(ERR_EXIT, "only one of -l and -s may be specified"); |
dd197a33 | 65 | |
34cbacef KB |
66 | if (argc < 2 || argc > 4) |
67 | usage(); | |
68 | ||
dd197a33 KB |
69 | /* Backward compatibility -- handle "-" meaning stdin. */ |
70 | special = 0; | |
71 | if (strcmp(file1 = argv[0], "-") == 0) { | |
72 | special = 1; | |
1b7289a3 | 73 | fd1 = 0; |
dd197a33 KB |
74 | file1 = "stdin"; |
75 | } | |
1b7289a3 | 76 | else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) |
c3afbeb5 | 77 | err(ERR_EXIT, "%s", file1); |
dd197a33 KB |
78 | if (strcmp(file2 = argv[1], "-") == 0) { |
79 | if (special) | |
c3afbeb5 JSP |
80 | errx(ERR_EXIT, |
81 | "standard input may only be specified once"); | |
dd197a33 | 82 | special = 1; |
1b7289a3 | 83 | fd2 = 0; |
dd197a33 | 84 | file2 = "stdin"; |
1b88b85d | 85 | } |
dd197a33 | 86 | else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) |
c3afbeb5 | 87 | err(ERR_EXIT, "%s", file2); |
dd197a33 KB |
88 | |
89 | skip1 = argc > 2 ? strtol(argv[2], NULL, 10) : 0; | |
90 | skip2 = argc == 4 ? strtol(argv[3], NULL, 10) : 0; | |
91 | ||
92 | if (!special) { | |
93 | if (fstat(fd1, &sb1)) | |
c3afbeb5 | 94 | err(ERR_EXIT, "%s", file1); |
dd197a33 KB |
95 | if (!S_ISREG(sb1.st_mode)) |
96 | special = 1; | |
97 | else { | |
98 | if (fstat(fd2, &sb2)) | |
c3afbeb5 | 99 | err(ERR_EXIT, "%s", file2); |
dd197a33 KB |
100 | if (!S_ISREG(sb2.st_mode)) |
101 | special = 1; | |
34cbacef | 102 | } |
1b88b85d | 103 | } |
ec37e2d9 | 104 | |
dd197a33 KB |
105 | if (special) |
106 | c_special(fd1, file1, skip1, fd2, file2, skip2); | |
107 | else | |
108 | c_regular(fd1, file1, skip1, sb1.st_size, | |
109 | fd2, file2, skip2, sb2.st_size); | |
110 | exit(0); | |
ec37e2d9 KB |
111 | } |
112 | ||
dd197a33 | 113 | static void |
34cbacef | 114 | usage() |
1b88b85d | 115 | { |
c3afbeb5 | 116 | |
51ea332c | 117 | (void)fprintf(stderr, |
409b7fd4 | 118 | "usage: cmp [-l | s] file1 file2 [skip1 [skip2]]\n"); |
c3afbeb5 | 119 | exit(ERR_EXIT); |
1b88b85d | 120 | } |