1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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/types.h>
33
34#include <err.h>
35#include <errno.h>
36#include <locale.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <unistd.h>
41#include <wchar.h>
42
43static void usage(void) __dead2;
44
45int
46main(int argc, char *argv[])
47{
48	const char *filename;
49	wchar_t *p, *t;
50	FILE *fp;
51	size_t len;
52	int ch, rval;
53
54	setlocale(LC_ALL, "");
55
56	while ((ch = getopt(argc, argv, "")) != -1)
57		switch(ch) {
58		case '?':
59		default:
60			usage();
61		}
62
63	argc -= optind;
64	argv += optind;
65
66	fp = stdin;
67	filename = "stdin";
68	rval = 0;
69	do {
70		if (*argv) {
71			if ((fp = fopen(*argv, "r")) == NULL) {
72				warn("%s", *argv);
73				rval = 1;
74				++argv;
75				continue;
76			}
77			filename = *argv++;
78		}
79		while ((p = fgetwln(fp, &len)) != NULL) {
80			if (p[len - 1] == '\n')
81				--len;
82			for (t = p + len - 1; t >= p; --t)
83				putwchar(*t);
84			putwchar('\n');
85		}
86		if (ferror(fp)) {
87			warn("%s", filename);
88			clearerr(fp);
89			rval = 1;
90		}
91		(void)fclose(fp);
92	} while(*argv);
93	exit(rval);
94}
95
96void
97usage(void)
98{
99	(void)fprintf(stderr, "usage: rev [file ...]\n");
100	exit(1);
101}
102