Annotation of src/usr.bin/comm/comm.c, Revision 1.4
1.4 ! aaron 1: /* $OpenBSD: comm.c,v 1.3 1999/02/17 03:35:49 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: comm.c,v 1.10 1995/09/05 19:57:43 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1989, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Case Larsen.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the University of
22: * California, Berkeley and its contributors.
23: * 4. Neither the name of the University nor the names of its contributors
24: * may be used to endorse or promote products derived from this software
25: * without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37: * SUCH DAMAGE.
38: */
39:
40: #ifndef lint
41: static char copyright[] =
42: "@(#) Copyright (c) 1989, 1993, 1994\n\
43: The Regents of the University of California. All rights reserved.\n";
44: #endif /* not lint */
45:
46: #ifndef lint
47: #if 0
48: static char sccsid[] = "@(#)comm.c 8.4 (Berkeley) 5/4/95";
49: #endif
1.4 ! aaron 50: static char rcsid[] = "$OpenBSD: comm.c,v 1.3 1999/02/17 03:35:49 deraadt Exp $";
1.1 deraadt 51: #endif /* not lint */
52:
53: #include <err.h>
54: #include <limits.h>
55: #include <locale.h>
56: #include <stdio.h>
57: #include <stdlib.h>
58: #include <string.h>
59: #include <unistd.h>
60:
61: #define MAXLINELEN (LINE_MAX + 1)
62:
63: char *tabs[] = { "", "\t", "\t\t" };
64:
65: FILE *file __P((const char *));
66: void show __P((FILE *, char *, char *));
67: void usage __P((void));
68:
69: int
70: main(argc, argv)
71: int argc;
72: char **argv;
73: {
74: int comp, file1done, file2done, read1, read2;
75: int ch, flag1, flag2, flag3;
76: FILE *fp1, *fp2;
77: char *col1, *col2, *col3;
78: char **p, line1[MAXLINELEN], line2[MAXLINELEN];
1.3 deraadt 79: int (*compare) __P((const char * ,const char *));
1.1 deraadt 80:
81: setlocale(LC_ALL, "");
82:
83: flag1 = flag2 = flag3 = 1;
1.3 deraadt 84: compare = strcoll;
85: while ((ch = getopt(argc, argv, "123f")) != -1)
1.1 deraadt 86: switch(ch) {
87: case '1':
88: flag1 = 0;
89: break;
90: case '2':
91: flag2 = 0;
92: break;
93: case '3':
94: flag3 = 0;
95: break;
1.3 deraadt 96: case 'f':
97: compare = strcasecmp;
98: break;
1.1 deraadt 99: case '?':
100: default:
101: usage();
102: }
103: argc -= optind;
104: argv += optind;
105:
106: if (argc != 2)
107: usage();
108:
109: fp1 = file(argv[0]);
110: fp2 = file(argv[1]);
111:
112: /* for each column printed, add another tab offset */
113: p = tabs;
114: col1 = col2 = col3 = NULL;
115: if (flag1)
116: col1 = *p++;
117: if (flag2)
118: col2 = *p++;
119: if (flag3)
120: col3 = *p;
121:
122: for (read1 = read2 = 1;;) {
123: /* read next line, check for EOF */
124: if (read1)
125: file1done = !fgets(line1, MAXLINELEN, fp1);
126: if (read2)
127: file2done = !fgets(line2, MAXLINELEN, fp2);
128:
129: /* if one file done, display the rest of the other file */
130: if (file1done) {
131: if (!file2done && col2)
132: show(fp2, col2, line2);
133: break;
134: }
135: if (file2done) {
136: if (!file1done && col1)
137: show(fp1, col1, line1);
138: break;
139: }
140:
141: /* lines are the same */
1.3 deraadt 142: if (!(comp = compare(line1, line2))) {
1.1 deraadt 143: read1 = read2 = 1;
144: if (col3)
145: if (printf("%s%s", col3, line1) < 0)
146: break;
147: continue;
148: }
149:
150: /* lines are different */
151: if (comp < 0) {
152: read1 = 1;
153: read2 = 0;
154: if (col1)
155: if (printf("%s%s", col1, line1) < 0)
156: break;
157: } else {
158: read1 = 0;
159: read2 = 1;
160: if (col2)
161: if (printf("%s%s", col2, line2) < 0)
162: break;
163: }
164: }
165:
166: if (ferror (stdout) || fclose (stdout) == EOF)
167: err(1, "stdout");
168:
169: exit(0);
170: }
171:
172: void
173: show(fp, offset, buf)
174: FILE *fp;
175: char *offset, *buf;
176: {
177: while (printf("%s%s", offset, buf) >= 0 && fgets(buf, MAXLINELEN, fp))
178: ;
179: }
180:
181: FILE *
182: file(name)
183: const char *name;
184: {
185: FILE *fp;
186:
187: if (!strcmp(name, "-"))
188: return (stdin);
189: if ((fp = fopen(name, "r")) == NULL)
190: err(1, "%s", name);
191: return (fp);
192: }
193:
194: void
195: usage()
196: {
1.4 ! aaron 197: (void)fprintf(stderr, "usage: comm [-123f] file1 file2\n");
1.1 deraadt 198: exit(1);
199: }
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