Annotation of src/usr.bin/colrm/colrm.c, Revision 1.8
1.8 ! deraadt 1: /* $OpenBSD: colrm.c,v 1.7 2003/06/03 02:56:07 millert 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.
1.7 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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
1.8 ! deraadt 43: static char rcsid[] = "$OpenBSD: colrm.c,v 1.7 2003/06/03 02:56:07 millert Exp $";
1.1 deraadt 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:
1.6 millert 58: void check(FILE *);
59: void usage(void);
1.1 deraadt 60:
61: int
1.8 ! deraadt 62: main(int argc, char *argv[])
1.1 deraadt 63: {
1.5 mpech 64: u_long column, start, stop;
65: int ch;
1.1 deraadt 66: char *p;
67:
1.3 millert 68: while ((ch = getopt(argc, argv, "")) != -1)
1.1 deraadt 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:
1.4 deraadt 118: if ((!start || column < start || (stop && column > stop)) &&
1.1 deraadt 119: putchar(ch) == EOF)
120: check(stdout);
121: }
122: }
123:
124: void
1.8 ! deraadt 125: check(FILE *stream)
1.1 deraadt 126: {
127: if (feof(stream))
128: exit(0);
129: if (ferror(stream))
130: err(1, "%s", stream == stdin ? "stdin" : "stdout");
131: }
132:
133: void
1.8 ! deraadt 134: usage(void)
1.1 deraadt 135: {
136: (void)fprintf(stderr, "usage: colrm [start [stop]]\n");
137: exit(1);
138: }