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 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#ifndef lint
41static char sccsid[] = "@(#)rev.c 8.2 (Berkeley) 1/2/94";
42#endif /* not lint */
43
44#include <sys/types.h>
45
46#include <err.h>
47#include <errno.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51
52void usage __P((void));
53
54int
55main(argc, argv)
56 int argc;
57 char *argv[];
58{
59 register char *filename, *p, *t;
60 FILE *fp;
61 size_t len;
62 int ch, rval;
63
64 while ((ch = getopt(argc, argv, "")) != EOF)
65 switch(ch) {
66 case '?':
67 default:
68 usage();
69 }
70
71 argc -= optind;
72 argv += optind;
73
74 fp = stdin;
75 filename = "stdin";
76 rval = 0;
77 do {
78 if (*argv) {
79 if ((fp = fopen(*argv, "r")) == NULL) {
80 warn("%s", *argv);
81 rval = 1;
82 ++argv;
83 continue;
84 }
85 filename = *argv++;
86 }
87 while ((p = fgetln(fp, &len)) != NULL) {
88 if (p[len - 1] == '\n')
89 --len;
90 t = p + len - 1;
91 for (t = p + len - 1; t >= p; --t)
92 putchar(*t);
93 putchar('\n');
94 }
95 if (ferror(fp)) {
96 warn("%s", filename);
97 rval = 1;
98 }
99 (void)fclose(fp);
100 } while(*argv);
101 exit(rval);
102}
103
104void
105usage()
106{
107 (void)fprintf(stderr, "usage: rev [file ...]\n");
108 exit(1);
109}