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1.1 root 1: /*
2: * Copyright (c) 1989 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * This code is derived from software contributed to Berkeley by
6: * Case Larsen.
7: *
8: * Redistribution and use in source and binary forms are permitted provided
9: * that: (1) source distributions retain this entire copyright notice and
10: * comment, and (2) distributions including binaries display the following
11: * acknowledgement: ``This product includes software developed by the
12: * University of California, Berkeley and its contributors'' in the
13: * documentation or other materials provided with the distribution and in
14: * all advertising materials mentioning features or use of this software.
15: * Neither the name of the University nor the names of its contributors may
16: * be used to endorse or promote products derived from this software without
17: * specific prior written permission.
18: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
19: * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
20: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21: */
22:
23: #ifndef lint
24: char copyright[] =
25: "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
26: All rights reserved.\n";
27: #endif /* not lint */
28:
29: #ifndef lint
30: static char sccsid[] = "@(#)comm.c 5.5 (Berkeley) 6/25/90";
31: #endif /* not lint */
32:
33: #include <sys/file.h>
34: #include <limits.h>
35: #include <stdio.h>
36:
37: #define MAXLINELEN (_BSD_LINE_MAX + 1)
38:
39: char *tabs[] = { "", "\t", "\t\t" };
40:
41: main(argc,argv)
42: int argc;
43: char *argv[];
44: {
45: register int comp, file1done, file2done, read1, read2;
46: register char *col1, *col2, *col3;
47: int ch, flag1, flag2, flag3;
48: FILE *fp1, *fp2, *file();
49: char **p, line1[MAXLINELEN], line2[MAXLINELEN];
50: extern int optind;
51:
52: flag1 = flag2 = flag3 = 1;
53: while ((ch = getopt(argc, argv, "-123")) != EOF)
54: switch(ch) {
55: case '-':
56: --optind;
57: goto done;
58: case '1':
59: flag1 = 0;
60: break;
61: case '2':
62: flag2 = 0;
63: break;
64: case '3':
65: flag3 = 0;
66: break;
67: case '?':
68: default:
69: usage();
70: }
71: done: argc -= optind;
72: argv += optind;
73:
74: if (argc != 2)
75: usage();
76:
77: fp1 = file(argv[0]);
78: fp2 = file(argv[1]);
79:
80: /* for each column printed, add another tab offset */
81: p = tabs;
82: if (flag1)
83: col1 = *p++;
84: if (flag2)
85: col2 = *p++;
86: if (flag3)
87: col3 = *p++;
88:
89: for (read1 = read2 = 1;;) {
90: /* read next line, check for EOF */
91: if (read1)
92: file1done = !fgets(line1, MAXLINELEN, fp1);
93: if (read2)
94: file2done = !fgets(line2, MAXLINELEN, fp2);
95:
96: /* if one file done, display the rest of the other file */
97: if (file1done) {
98: if (!file2done && col2)
99: show(fp2, col2, line2);
100: break;
101: }
102: if (file2done) {
103: if (!file1done && col1)
104: show(fp1, col1, line1);
105: break;
106: }
107:
108: /* lines are the same */
109: if (!(comp = strcmp(line1, line2))) {
110: read1 = read2 = 1;
111: if (col3)
112: (void)printf("%s%s", col3, line1);
113: continue;
114: }
115:
116: /* lines are different */
117: if (comp < 0) {
118: read1 = 1;
119: read2 = 0;
120: if (col1)
121: (void)printf("%s%s", col1, line1);
122: } else {
123: read1 = 0;
124: read2 = 1;
125: if (col2)
126: (void)printf("%s%s", col2, line2);
127: }
128: }
129: exit(0);
130: }
131:
132: show(fp, offset, buf)
133: FILE *fp;
134: char *offset, *buf;
135: {
136: do {
137: (void)printf("%s%s", offset, buf);
138: } while (fgets(buf, MAXLINELEN, fp));
139: }
140:
141: FILE *
142: file(name)
143: char *name;
144: {
145: FILE *fp;
146:
147: if (!strcmp(name, "-"))
148: return(stdin);
149: if (!(fp = fopen(name, "r"))) {
150: (void)fprintf(stderr, "comm: can't read %s.\n", name);
151: exit(1);
152: }
153: return(fp);
154: }
155:
156: usage()
157: {
158: (void)fprintf(stderr, "usage: comm [-123] [ - ] file1 file2\n");
159: exit(1);
160: }
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