1/*	$NetBSD: rev.c,v 1.11 2009/07/21 01:25:14 ahoka 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. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1987, 1992, 1993\
35 The Regents of the University of California.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)rev.c	8.3 (Berkeley) 5/4/95";
41#else
42__RCSID("$NetBSD: rev.c,v 1.11 2009/07/21 01:25:14 ahoka Exp $");
43#endif
44#endif /* not lint */
45
46#include <sys/types.h>
47
48#include <err.h>
49#include <errno.h>
50#include <locale.h>
51#include <stdio.h>
52#include <stdlib.h>
53#include <unistd.h>
54#include <wchar.h>
55
56__dead static void usage(void);
57
58int
59main(int argc, char *argv[])
60{
61	const char *filename;
62	wchar_t *p, *t;
63	FILE *fp;
64	size_t len;
65	int ch, rval;
66
67	setlocale(LC_ALL, "");
68	setprogname(argv[0]);
69
70	while ((ch = getopt(argc, argv, "")) != -1)
71		switch(ch) {
72		case '?':
73		default:
74			usage();
75		}
76
77	argc -= optind;
78	argv += optind;
79
80	fp = stdin;
81	filename = "stdin";
82	rval = 0;
83	do {
84		if (*argv) {
85			if ((fp = fopen(*argv, "r")) == NULL) {
86				warn("%s", *argv);
87				rval = 1;
88				++argv;
89				continue;
90			}
91			filename = *argv++;
92		}
93		while ((p = fgetwln(fp, &len)) != NULL) {
94			if (p[len - 1] == L'\n')
95				--len;
96			t = p + len - 1;
97			for (t = p + len - 1; t >= p; --t)
98				putwchar(*t);
99			putwchar(L'\n');
100		}
101		if (ferror(fp)) {
102			warn("%s", filename);
103			rval = 1;
104		}
105		(void)fclose(fp);
106	} while(*argv);
107	exit(rval);
108}
109
110static void
111usage(void)
112{
113	(void)fprintf(stderr, "usage: %s [file ...]\n", getprogname());
114	exit(EXIT_FAILURE);
115}
116