xref: /netbsd/usr.bin/rev/rev.c (revision bf9ec67e)
1 /*	$NetBSD: rev.c,v 1.6 1997/10/19 14:03:34 lukem 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. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *	This product includes software developed by the University of
18  *	California, Berkeley and its contributors.
19  * 4. Neither the name of the University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  */
35 
36 #include <sys/cdefs.h>
37 #ifndef lint
38 __COPYRIGHT("@(#) Copyright (c) 1987, 1992, 1993\n\
39 	The Regents of the University of California.  All rights reserved.\n");
40 #endif /* not lint */
41 
42 #ifndef lint
43 #if 0
44 static char sccsid[] = "@(#)rev.c	8.3 (Berkeley) 5/4/95";
45 #else
46 __RCSID("$NetBSD: rev.c,v 1.6 1997/10/19 14:03:34 lukem Exp $");
47 #endif
48 #endif /* not lint */
49 
50 #include <sys/types.h>
51 
52 #include <err.h>
53 #include <errno.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57 #include <unistd.h>
58 
59 int	main __P((int, char **));
60 void	usage __P((void));
61 
62 int
63 main(argc, argv)
64 	int argc;
65 	char *argv[];
66 {
67 	char *filename, *p, *t;
68 	FILE *fp;
69 	size_t len;
70 	int ch, rval;
71 
72 	while ((ch = getopt(argc, argv, "")) != -1)
73 		switch(ch) {
74 		case '?':
75 		default:
76 			usage();
77 		}
78 
79 	argc -= optind;
80 	argv += optind;
81 
82 	fp = stdin;
83 	filename = "stdin";
84 	rval = 0;
85 	do {
86 		if (*argv) {
87 			if ((fp = fopen(*argv, "r")) == NULL) {
88 				warn("%s", *argv);
89 				rval = 1;
90 				++argv;
91 				continue;
92 			}
93 			filename = *argv++;
94 		}
95 		while ((p = fgetln(fp, &len)) != NULL) {
96 			if (p[len - 1] == '\n')
97 				--len;
98 			t = p + len - 1;
99 			for (t = p + len - 1; t >= p; --t)
100 				putchar(*t);
101 			putchar('\n');
102 		}
103 		if (ferror(fp)) {
104 			warn("%s", filename);
105 			rval = 1;
106 		}
107 		(void)fclose(fp);
108 	} while(*argv);
109 	exit(rval);
110 }
111 
112 void
113 usage()
114 {
115 	(void)fprintf(stderr, "usage: rev [file ...]\n");
116 	exit(1);
117 }
118