Commit | Line | Data |
---|---|---|
94721995 KB |
1 | /* |
2 | * Copyright (c) 1987 Regents of the University of California. | |
cde75055 KB |
3 | * All rights reserved. |
4 | * | |
af359dea C |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
94721995 KB |
32 | */ |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
152df645 | 36 | "@(#) Copyright (c) 1987, 1990 Regents of the University of California.\n\ |
94721995 | 37 | All rights reserved.\n"; |
b8c620d6 | 38 | #endif /* not lint */ |
94721995 KB |
39 | |
40 | #ifndef lint | |
1c15e888 | 41 | static char sccsid[] = "@(#)cmp.c 5.3 (Berkeley) 6/1/90"; |
b8c620d6 | 42 | #endif /* not lint */ |
34cbacef KB |
43 | |
44 | #include <sys/param.h> | |
45 | #include <sys/file.h> | |
46 | #include <sys/stat.h> | |
1b88b85d BJ |
47 | #include <stdio.h> |
48 | #include <ctype.h> | |
ec37e2d9 | 49 | #include <errno.h> |
1b88b85d | 50 | |
1b7289a3 KB |
51 | #define EXITNODIFF 0 |
52 | #define EXITDIFF 1 | |
53 | #define EXITERR 2 | |
1b88b85d | 54 | |
152df645 MK |
55 | int all, fd1, fd2, silent; |
56 | u_char buf1[MAXBSIZE], buf2[MAXBSIZE]; | |
57 | char *file1, *file2; | |
1b88b85d | 58 | |
ec37e2d9 | 59 | main(argc, argv) |
1b7289a3 | 60 | int argc; |
152df645 | 61 | char *argv[]; |
1b88b85d | 62 | { |
1b7289a3 KB |
63 | extern char *optarg; |
64 | extern int optind; | |
65 | int ch; | |
66 | u_long otoi(); | |
34cbacef | 67 | |
1b7289a3 | 68 | while ((ch = getopt(argc, argv, "-ls")) != EOF) |
152df645 | 69 | switch (ch) { |
ec37e2d9 | 70 | case 'l': /* print all differences */ |
1b7289a3 | 71 | all = 1; |
ec37e2d9 KB |
72 | break; |
73 | case 's': /* silent run */ | |
1b7289a3 | 74 | silent = 1; |
ec37e2d9 | 75 | break; |
1b7289a3 KB |
76 | case '-': /* must be after any flags */ |
77 | --optind; | |
78 | goto endargs; | |
ec37e2d9 KB |
79 | case '?': |
80 | default: | |
81 | usage(); | |
34cbacef | 82 | } |
1b7289a3 | 83 | endargs: |
34cbacef KB |
84 | argv += optind; |
85 | argc -= optind; | |
1b88b85d | 86 | |
34cbacef KB |
87 | if (argc < 2 || argc > 4) |
88 | usage(); | |
89 | ||
1b7289a3 KB |
90 | if (all && silent) { |
91 | fprintf(stderr, | |
92 | "cmp: only one of -l and -s may be specified.\n"); | |
93 | exit(EXITERR); | |
94 | } | |
152df645 | 95 | if (strcmp(file1 = argv[0], "-") == 0) |
1b7289a3 KB |
96 | fd1 = 0; |
97 | else if ((fd1 = open(file1, O_RDONLY, 0)) < 0) | |
ec37e2d9 | 98 | error(file1); |
152df645 | 99 | if (strcmp(file2 = argv[1], "-") == 0) |
1b7289a3 KB |
100 | fd2 = 0; |
101 | else if ((fd2 = open(file2, O_RDONLY, 0)) < 0) | |
ec37e2d9 | 102 | error(file2); |
1b7289a3 KB |
103 | if (fd1 == fd2) { |
104 | fprintf(stderr, | |
105 | "cmp: standard input may only be specified once.\n"); | |
106 | exit(EXITERR); | |
107 | } | |
34cbacef KB |
108 | |
109 | /* handle skip arguments */ | |
110 | if (argc > 2) { | |
ec37e2d9 | 111 | skip(otoi(argv[2]), fd1, file1); |
34cbacef | 112 | if (argc == 4) |
ec37e2d9 | 113 | skip(otoi(argv[3]), fd2, file2); |
1b88b85d | 114 | } |
34cbacef | 115 | cmp(); |
ec37e2d9 | 116 | /*NOTREACHED*/ |
34cbacef KB |
117 | } |
118 | ||
119 | /* | |
120 | * skip -- | |
121 | * skip first part of file | |
122 | */ | |
ec37e2d9 | 123 | skip(dist, fd, fname) |
1b7289a3 KB |
124 | register u_long dist; |
125 | register int fd; | |
126 | char *fname; | |
34cbacef | 127 | { |
1b7289a3 | 128 | register int rlen, nread; |
ec37e2d9 KB |
129 | |
130 | for (; dist; dist -= rlen) { | |
131 | rlen = MIN(dist, sizeof(buf1)); | |
132 | if ((nread = read(fd, buf1, rlen)) != rlen) { | |
133 | if (nread < 0) | |
134 | error(fname); | |
135 | else | |
136 | endoffile(fname); | |
1b88b85d | 137 | } |
1b88b85d | 138 | } |
34cbacef | 139 | } |
1b88b85d | 140 | |
34cbacef KB |
141 | cmp() |
142 | { | |
152df645 | 143 | register u_char *p1, *p2; |
1b7289a3 KB |
144 | register int cnt, len1, len2; |
145 | register long byte, line; | |
146 | int dfound = 0; | |
34cbacef | 147 | |
152df645 MK |
148 | for (byte = 0, line = 1; ; ) { |
149 | switch (len1 = read(fd1, buf1, MAXBSIZE)) { | |
ec37e2d9 KB |
150 | case -1: |
151 | error(file1); | |
152 | case 0: | |
153 | /* | |
154 | * read of file 1 just failed, find out | |
155 | * if there's anything left in file 2 | |
156 | */ | |
152df645 | 157 | switch (read(fd2, buf2, 1)) { |
ec37e2d9 KB |
158 | case -1: |
159 | error(file2); | |
152df645 | 160 | /* NOTREACHED */ |
ec37e2d9 | 161 | case 0: |
1b7289a3 | 162 | exit(dfound ? EXITDIFF : EXITNODIFF); |
152df645 | 163 | /* NOTREACHED */ |
ec37e2d9 KB |
164 | default: |
165 | endoffile(file1); | |
152df645 | 166 | break; |
ec37e2d9 | 167 | } |
34cbacef KB |
168 | } |
169 | /* | |
170 | * file1 might be stdio, which means that a read of less than | |
171 | * MAXBSIZE might not mean an EOF. So, read whatever we read | |
172 | * from file1 from file2. | |
173 | */ | |
ec37e2d9 KB |
174 | if ((len2 = read(fd2, buf2, len1)) == -1) |
175 | error(file2); | |
176 | if (bcmp(buf1, buf2, len2)) { | |
34cbacef | 177 | if (silent) |
1b7289a3 | 178 | exit(EXITDIFF); |
34cbacef | 179 | if (all) { |
1b7289a3 | 180 | dfound = 1; |
152df645 MK |
181 | for (p1 = buf1, p2 = buf2, cnt = len2; cnt--; |
182 | ++p1, ++p2) { | |
34cbacef | 183 | ++byte; |
152df645 MK |
184 | if (*p1 != *p2) |
185 | printf("%6ld %3o %3o\n", | |
186 | byte, *p1, *p2); | |
34cbacef | 187 | } |
152df645 | 188 | } else for (p1 = buf1, p2 = buf2; ; ++p1, ++p2) { |
94721995 | 189 | ++byte; |
152df645 | 190 | if (*p1 != *p2) { |
ec37e2d9 | 191 | printf("%s %s differ: char %ld, line %ld\n", file1, file2, byte, line); |
1b7289a3 | 192 | exit(EXITDIFF); |
34cbacef | 193 | } |
152df645 | 194 | if (*p1 == '\n') |
94721995 KB |
195 | ++line; |
196 | } | |
1b7289a3 | 197 | } else { |
34cbacef KB |
198 | byte += len2; |
199 | /* | |
200 | * here's the real performance problem, we've got to | |
201 | * count the stupid lines, which means that -l is a | |
202 | * *much* faster version, i.e., unless you really | |
94721995 | 203 | * *want* to know the line number, run -s or -l. |
34cbacef | 204 | */ |
94721995 | 205 | if (!silent && !all) |
152df645 MK |
206 | for (p1 = buf1, cnt = len2; cnt--; ) |
207 | if (*p1++ == '\n') | |
34cbacef KB |
208 | ++line; |
209 | } | |
210 | /* | |
211 | * couldn't read as much from file2 as from file1; checked | |
212 | * here because there might be a difference before we got | |
213 | * to this point, which would have precedence. | |
214 | */ | |
ec37e2d9 KB |
215 | if (len2 < len1) |
216 | endoffile(file2); | |
1b88b85d | 217 | } |
34cbacef | 218 | } |
1b88b85d | 219 | |
34cbacef KB |
220 | /* |
221 | * otoi -- | |
222 | * octal/decimal string to u_long | |
223 | */ | |
152df645 MK |
224 | u_long |
225 | otoi(s) | |
226 | register char *s; | |
34cbacef | 227 | { |
1b7289a3 KB |
228 | register u_long val; |
229 | register int base; | |
1b88b85d | 230 | |
152df645 MK |
231 | base = (*s == '0') ? 8 : 10; |
232 | for (val = 0; isdigit(*s); ++s) | |
233 | val = val * base + *s - '0'; | |
234 | return (val); | |
1b88b85d BJ |
235 | } |
236 | ||
ec37e2d9 KB |
237 | /* |
238 | * error -- | |
239 | * print I/O error message and die | |
240 | */ | |
ec37e2d9 KB |
241 | error(filename) |
242 | char *filename; | |
243 | { | |
244 | extern int errno; | |
1b7289a3 | 245 | char *strerror(); |
ec37e2d9 | 246 | |
1b7289a3 | 247 | if (!silent) |
152df645 | 248 | (void) fprintf(stderr, "cmp: %s: %s\n", |
1b7289a3 KB |
249 | filename, strerror(errno)); |
250 | exit(EXITERR); | |
ec37e2d9 KB |
251 | } |
252 | ||
253 | /* | |
254 | * endoffile -- | |
255 | * print end-of-file message and exit indicating the files were different | |
256 | */ | |
ec37e2d9 KB |
257 | endoffile(filename) |
258 | char *filename; | |
259 | { | |
260 | /* 32V put this message on stdout, S5 does it on stderr. */ | |
152df645 | 261 | /* POSIX.2 currently does it on stdout-- Hooray! */ |
ec37e2d9 | 262 | if (!silent) |
152df645 | 263 | (void) printf("cmp: EOF on %s\n", filename); |
1b7289a3 | 264 | exit(EXITDIFF); |
ec37e2d9 KB |
265 | } |
266 | ||
34cbacef KB |
267 | /* |
268 | * usage -- | |
269 | * print usage and die | |
270 | */ | |
34cbacef | 271 | usage() |
1b88b85d | 272 | { |
ec37e2d9 | 273 | fputs("usage: cmp [-ls] file1 file2 [skip1] [skip2]\n", stderr); |
1b7289a3 | 274 | exit(EXITERR); |
1b88b85d | 275 | } |