rev.c revision 331722 
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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1987, 1992, 1993\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif /* not lint */
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)rev.c	8.3 (Berkeley) 5/4/95";
39#endif /* not lint */
40#endif
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: stable/11/usr.bin/rev/rev.c 331722 2018-03-29 02:50:57Z eadler $");
44
45#include <sys/types.h>
46
47#include <err.h>
48#include <errno.h>
49#include <locale.h>
50#include <stdio.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54#include <wchar.h>
55
56static 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
69	while ((ch = getopt(argc, argv, "")) != -1)
70		switch(ch) {
71		case '?':
72		default:
73			usage();
74		}
75
76	argc -= optind;
77	argv += optind;
78
79	fp = stdin;
80	filename = "stdin";
81	rval = 0;
82	do {
83		if (*argv) {
84			if ((fp = fopen(*argv, "r")) == NULL) {
85				warn("%s", *argv);
86				rval = 1;
87				++argv;
88				continue;
89			}
90			filename = *argv++;
91		}
92		while ((p = fgetwln(fp, &len)) != NULL) {
93			if (p[len - 1] == '\n')
94				--len;
95			for (t = p + len - 1; t >= p; --t)
96				putwchar(*t);
97			putwchar('\n');
98		}
99		if (ferror(fp)) {
100			warn("%s", filename);
101			clearerr(fp);
102			rval = 1;
103		}
104		(void)fclose(fp);
105	} while(*argv);
106	exit(rval);
107}
108
109void
110usage(void)
111{
112	(void)fprintf(stderr, "usage: rev [file ...]\n");
113	exit(1);
114}
115