1/*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
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.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1991, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
38#endif
39
40#if 0
41#ifndef lint
42static char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95";
43#endif
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.bin/colrm/colrm.c 100817 2002-07-28 15:22:43Z dwmalone $");
48
49#include <sys/types.h>
50#include <err.h>
51#include <errno.h>
52#include <limits.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <string.h>
56#include <unistd.h>
57
58#define TAB 8
59
60void check(FILE *);
61static void usage(void);
62
63int
64main(int argc, char *argv[])
65{
66 u_long column, start, stop;
67 int ch;
68 char *p;
69
70 while ((ch = getopt(argc, argv, "")) != -1)
71 switch(ch) {
72 case '?':
73 default:
74 usage();
75 }
76 argc -= optind;
77 argv += optind;
78
79 start = stop = 0;
80 switch(argc) {
81 case 2:
82 stop = strtol(argv[1], &p, 10);
83 if (stop <= 0 || *p)
84 errx(1, "illegal column -- %s", argv[1]);
85 /* FALLTHROUGH */
86 case 1:
87 start = strtol(argv[0], &p, 10);
88 if (start <= 0 || *p)
89 errx(1, "illegal column -- %s", argv[0]);
90 break;
91 case 0:
92 break;
93 default:
94 usage();
95 }
96
97 if (stop && start > stop)
98 errx(1, "illegal start and stop columns");
99
100 for (column = 0;;) {
101 switch (ch = getchar()) {
102 case EOF:
103 check(stdin);
104 break;
105 case '\b':
106 if (column)
107 --column;
108 break;
109 case '\n':
110 column = 0;
111 break;
112 case '\t':
113 column = (column + TAB) & ~(TAB - 1);
114 break;
115 default:
116 ++column;
117 break;
118 }
119
120 if ((!start || column < start || (stop && column > stop)) &&
121 putchar(ch) == EOF)
122 check(stdout);
123 }
124}
125
126void
127check(FILE *stream)
128{
129 if (feof(stream))
130 exit(0);
131 if (ferror(stream))
132 err(1, "%s", stream == stdin ? "stdin" : "stdout");
133}
134
135void
136usage(void)
137{
138 (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
139 exit(1);
140}
141