Annotation of src/usr.bin/colrm/colrm.c, Revision 1.3
1.3 ! millert 1: /* $OpenBSD: colrm.c,v 1.2 1996/06/26 05:32:14 deraadt Exp $ */
1.1 deraadt 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. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by the University of
19: * California, Berkeley and its contributors.
20: * 4. Neither the name of the University nor the names of its contributors
21: * may be used to endorse or promote products derived from this software
22: * without specific prior written permission.
23: *
24: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34: * SUCH DAMAGE.
35: */
36:
37: #ifndef lint
38: static char copyright[] =
39: "@(#) Copyright (c) 1991, 1993\n\
40: The Regents of the University of California. All rights reserved.\n";
41: #endif /* not lint */
42:
43: #ifndef lint
44: #if 0
45: static char sccsid[] = "@(#)colrm.c 8.2 (Berkeley) 5/4/95";
46: #endif
1.3 ! millert 47: static char rcsid[] = "$OpenBSD: colrm.c,v 1.2 1996/06/26 05:32:14 deraadt Exp $";
1.1 deraadt 48: #endif /* not lint */
49:
50: #include <sys/types.h>
51:
52: #include <err.h>
53: #include <errno.h>
54: #include <limits.h>
55: #include <stdio.h>
56: #include <stdlib.h>
57: #include <string.h>
58: #include <unistd.h>
59:
60: #define TAB 8
61:
62: void check __P((FILE *));
63: void usage __P((void));
64:
65: int
66: main(argc, argv)
67: int argc;
68: char *argv[];
69: {
70: register u_long column, start, stop;
71: register int ch;
72: char *p;
73:
1.3 ! millert 74: while ((ch = getopt(argc, argv, "")) != -1)
1.1 deraadt 75: switch(ch) {
76: case '?':
77: default:
78: usage();
79: }
80: argc -= optind;
81: argv += optind;
82:
83: start = stop = 0;
84: switch(argc) {
85: case 2:
86: stop = strtol(argv[1], &p, 10);
87: if (stop <= 0 || *p)
88: errx(1, "illegal column -- %s", argv[1]);
89: /* FALLTHROUGH */
90: case 1:
91: start = strtol(argv[0], &p, 10);
92: if (start <= 0 || *p)
93: errx(1, "illegal column -- %s", argv[0]);
94: break;
95: case 0:
96: break;
97: default:
98: usage();
99: }
100:
101: if (stop && start > stop)
102: err(1, "illegal start and stop columns");
103:
104: for (column = 0;;) {
105: switch (ch = getchar()) {
106: case EOF:
107: check(stdin);
108: break;
109: case '\b':
110: if (column)
111: --column;
112: break;
113: case '\n':
114: column = 0;
115: break;
116: case '\t':
117: column = (column + TAB) & ~(TAB - 1);
118: break;
119: default:
120: ++column;
121: break;
122: }
123:
124: if ((!start || column < start || stop && column > stop) &&
125: putchar(ch) == EOF)
126: check(stdout);
127: }
128: }
129:
130: void
131: check(stream)
132: FILE *stream;
133: {
134: if (feof(stream))
135: exit(0);
136: if (ferror(stream))
137: err(1, "%s", stream == stdin ? "stdin" : "stdout");
138: }
139:
140: void
141: usage()
142: {
143: (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
144: exit(1);
145: }