1 /* $NetBSD: colrm.c,v 1.9 2011/08/30 21:35:09 joerg Exp $ */
2
3 /*-
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1991, 1993\
35 The Regents of the University of California. All rights reserved.");
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95";
41 #endif
42 __RCSID("$NetBSD: colrm.c,v 1.9 2011/08/30 21:35:09 joerg Exp $");
43 #endif /* not lint */
44
45 #include <sys/types.h>
46
47 #include <err.h>
48 #include <errno.h>
49 #include <limits.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54
55 #define TAB 8
56
57 static void check(FILE *);
58 __dead static void usage(void);
59
60 int
main(int argc,char * argv[])61 main(int argc, char *argv[])
62 {
63 u_long column, start, stop;
64 int ch;
65 char *p;
66
67 while ((ch = getopt(argc, argv, "")) != -1)
68 switch(ch) {
69 case '?':
70 default:
71 usage();
72 }
73 argc -= optind;
74 argv += optind;
75
76 start = stop = 0;
77 switch(argc) {
78 case 2:
79 stop = strtol(argv[1], &p, 10);
80 if (stop <= 0 || *p)
81 errx(1, "illegal column -- %s", argv[1]);
82 /* FALLTHROUGH */
83 case 1:
84 start = strtol(argv[0], &p, 10);
85 if (start <= 0 || *p)
86 errx(1, "illegal column -- %s", argv[0]);
87 break;
88 case 0:
89 break;
90 default:
91 usage();
92 }
93
94 if (stop && start > stop)
95 err(1, "illegal start and stop columns");
96
97 for (column = 0;;) {
98 switch (ch = getchar()) {
99 case EOF:
100 check(stdin);
101 break;
102 case '\b':
103 if (column)
104 --column;
105 break;
106 case '\n':
107 column = 0;
108 break;
109 case '\t':
110 column = (column + TAB) & ~(TAB - 1);
111 break;
112 default:
113 ++column;
114 break;
115 }
116
117 if ((!start || column < start || (stop && column > stop)) &&
118 putchar(ch) == EOF)
119 check(stdout);
120 }
121 }
122
123 static void
check(FILE * stream)124 check(FILE *stream)
125 {
126 if (feof(stream))
127 exit(0);
128 if (ferror(stream))
129 err(1, "%s", stream == stdin ? "stdin" : "stdout");
130 }
131
132 static void
usage(void)133 usage(void)
134 {
135 (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
136 exit(1);
137 }
138