1 /* $OpenBSD: colrm.c,v 1.8 2003/06/10 22:20:45 deraadt Exp $ */
2 /* $NetBSD: colrm.c,v 1.4 1995/09/02 05:51:37 jtc Exp $ */
3
4 /*-
5 * Copyright (c) 1991, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 static char copyright[] =
35 "@(#) Copyright (c) 1991, 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 #if 0
41 static char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95";
42 #endif
43 static char rcsid[] = "$OpenBSD: colrm.c,v 1.8 2003/06/10 22:20:45 deraadt Exp $";
44 #endif /* not lint */
45
46 #include <sys/types.h>
47
48 #include <err.h>
49 #include <errno.h>
50 #include <limits.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <unistd.h>
55
56 #define TAB 8
57
58 void check(FILE *);
59 void usage(void);
60
61 int
main(int argc,char * argv[])62 main(int argc, char *argv[])
63 {
64 u_long column, start, stop;
65 int ch;
66 char *p;
67
68 while ((ch = getopt(argc, argv, "")) != -1)
69 switch(ch) {
70 case '?':
71 default:
72 usage();
73 }
74 argc -= optind;
75 argv += optind;
76
77 start = stop = 0;
78 switch(argc) {
79 case 2:
80 stop = strtol(argv[1], &p, 10);
81 if (stop <= 0 || *p)
82 errx(1, "illegal column -- %s", argv[1]);
83 /* FALLTHROUGH */
84 case 1:
85 start = strtol(argv[0], &p, 10);
86 if (start <= 0 || *p)
87 errx(1, "illegal column -- %s", argv[0]);
88 break;
89 case 0:
90 break;
91 default:
92 usage();
93 }
94
95 if (stop && start > stop)
96 err(1, "illegal start and stop columns");
97
98 for (column = 0;;) {
99 switch (ch = getchar()) {
100 case EOF:
101 check(stdin);
102 break;
103 case '\b':
104 if (column)
105 --column;
106 break;
107 case '\n':
108 column = 0;
109 break;
110 case '\t':
111 column = (column + TAB) & ~(TAB - 1);
112 break;
113 default:
114 ++column;
115 break;
116 }
117
118 if ((!start || column < start || (stop && column > stop)) &&
119 putchar(ch) == EOF)
120 check(stdout);
121 }
122 }
123
124 void
check(FILE * stream)125 check(FILE *stream)
126 {
127 if (feof(stream))
128 exit(0);
129 if (ferror(stream))
130 err(1, "%s", stream == stdin ? "stdin" : "stdout");
131 }
132
133 void
usage(void)134 usage(void)
135 {
136 (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
137 exit(1);
138 }
139