rev.c revision 200420 
1/*-
2 * Copyright (c) 1987, 1992, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1987, 1992, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#if 0
41#ifndef lint
42static char sccsid[] = "@(#)rev.c	8.3 (Berkeley) 5/4/95";
43#endif /* not lint */
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.bin/rev/rev.c 200420 2009-12-11 23:35:38Z delphij $");
48
49#include <sys/types.h>
50
51#include <err.h>
52#include <locale.h>
53#include <stdio.h>
54#include <stdlib.h>
55#include <unistd.h>
56#include <wchar.h>
57
58static void usage(void);
59
60int
61main(int argc, char *argv[])
62{
63	const char *filename;
64	wchar_t *p, *t;
65	FILE *fp;
66	size_t len;
67	int ch, rval;
68
69	setlocale(LC_ALL, "");
70
71	while ((ch = getopt(argc, argv, "")) != -1)
72		switch(ch) {
73		case '?':
74		default:
75			usage();
76		}
77
78	argc -= optind;
79	argv += optind;
80
81	fp = stdin;
82	filename = "stdin";
83	rval = 0;
84	do {
85		if (*argv) {
86			if ((fp = fopen(*argv, "r")) == NULL) {
87				warn("%s", *argv);
88				rval = 1;
89				++argv;
90				continue;
91			}
92			filename = *argv++;
93		}
94		while ((p = fgetwln(fp, &len)) != NULL) {
95			if (p[len - 1] == '\n')
96				--len;
97			for (t = p + len - 1; t >= p; --t)
98				putwchar(*t);
99			putwchar('\n');
100		}
101		if (ferror(fp)) {
102			warn("%s", filename);
103			clearerr(fp);
104			rval = 1;
105		}
106		(void)fclose(fp);
107	} while(*argv);
108	exit(rval);
109}
110
111void
112usage(void)
113{
114	(void)fprintf(stderr, "usage: rev [file ...]\n");
115	exit(1);
116}
117