2 * Copyright (c) 1989, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 static char copyright[] =
39 "@(#) Copyright (c) 1989, 1993, 1994\n\
40 The Regents of the University of California. All rights reserved.\n";
44 static char sccsid[] = "@(#)comm.c 8.3 (Berkeley) 4/2/94";
54 #define MAXLINELEN (LINE_MAX + 1)
56 char *tabs[] = { "", "\t", "\t\t" };
58 FILE *file __P((char *));
59 void show __P((FILE *, char *, char *));
60 void usage __P((void));
67 int comp, file1done, file2done, read1, read2;
68 int ch, flag1, flag2, flag3;
70 char *col1, *col2, *col3;
71 char **p, line1[MAXLINELEN], line2[MAXLINELEN];
73 flag1 = flag2 = flag3 = 1;
74 while ((ch = getopt(argc, argv, "-123")) != EOF)
101 /* for each column printed, add another tab offset */
103 col1 = col2 = col3 = NULL;
111 for (read1 = read2 = 1;;) {
112 /* read next line, check for EOF */
114 file1done = !fgets(line1, MAXLINELEN, fp1);
116 file2done = !fgets(line2, MAXLINELEN, fp2);
118 /* if one file done, display the rest of the other file */
120 if (!file2done && col2)
121 show(fp2, col2, line2);
125 if (!file1done && col1)
126 show(fp1, col1, line1);
130 /* lines are the same */
131 if (!(comp = strcmp(line1, line2))) {
134 (void)printf("%s%s", col3, line1);
138 /* lines are different */
143 (void)printf("%s%s", col1, line1);
148 (void)printf("%s%s", col2, line2);
155 show(fp, offset, buf)
161 (void)printf("%s%s", offset, buf);
162 } while (fgets(buf, MAXLINELEN, fp));
171 if (!strcmp(name, "-"))
173 if ((fp = fopen(name, "r")) == NULL) {
174 (void)fprintf(stderr, "comm: %s: %s\n", name, strerror(errno));
184 (void)fprintf(stderr, "usage: comm [-123] file1 file2\n");