rev.c revision 1.6 
1/*	$NetBSD: rev.c,v 1.6 1997/10/19 14:03:34 lukem Exp $	*/
2
3/*-
4 * Copyright (c) 1987, 1992, 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT("@(#) Copyright (c) 1987, 1992, 1993\n\
39	The Regents of the University of California.  All rights reserved.\n");
40#endif /* not lint */
41
42#ifndef lint
43#if 0
44static char sccsid[] = "@(#)rev.c	8.3 (Berkeley) 5/4/95";
45#else
46__RCSID("$NetBSD: rev.c,v 1.6 1997/10/19 14:03:34 lukem Exp $");
47#endif
48#endif /* not lint */
49
50#include <sys/types.h>
51
52#include <err.h>
53#include <errno.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58
59int	main __P((int, char **));
60void	usage __P((void));
61
62int
63main(argc, argv)
64	int argc;
65	char *argv[];
66{
67	char *filename, *p, *t;
68	FILE *fp;
69	size_t len;
70	int ch, rval;
71
72	while ((ch = getopt(argc, argv, "")) != -1)
73		switch(ch) {
74		case '?':
75		default:
76			usage();
77		}
78
79	argc -= optind;
80	argv += optind;
81
82	fp = stdin;
83	filename = "stdin";
84	rval = 0;
85	do {
86		if (*argv) {
87			if ((fp = fopen(*argv, "r")) == NULL) {
88				warn("%s", *argv);
89				rval = 1;
90				++argv;
91				continue;
92			}
93			filename = *argv++;
94		}
95		while ((p = fgetln(fp, &len)) != NULL) {
96			if (p[len - 1] == '\n')
97				--len;
98			t = p + len - 1;
99			for (t = p + len - 1; t >= p; --t)
100				putchar(*t);
101			putchar('\n');
102		}
103		if (ferror(fp)) {
104			warn("%s", filename);
105			rval = 1;
106		}
107		(void)fclose(fp);
108	} while(*argv);
109	exit(rval);
110}
111
112void
113usage()
114{
115	(void)fprintf(stderr, "usage: rev [file ...]\n");
116	exit(1);
117}
118