xref: /freebsd/usr.bin/rev/rev.c (revision 13014ca04aad1931d41958b56f71a2c65b9a7a2c)
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
35 static 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
42 static char sccsid[] = "@(#)rev.c	8.3 (Berkeley) 5/4/95";
43 #endif /* not lint */
44 #endif
45 
46 #include <sys/cdefs.h>
47 __FBSDID("$FreeBSD$");
48 
49 #include <sys/types.h>
50 
51 #include <err.h>
52 #include <errno.h>
53 #include <locale.h>
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57 #include <unistd.h>
58 #include <wchar.h>
59 
60 static void usage(void);
61 
62 int
63 main(int argc, char *argv[])
64 {
65 	const char *filename;
66 	wchar_t *p, *t;
67 	FILE *fp;
68 	size_t len;
69 	int ch, rval;
70 
71 	setlocale(LC_ALL, "");
72 
73 	while ((ch = getopt(argc, argv, "")) != -1)
74 		switch(ch) {
75 		case '?':
76 		default:
77 			usage();
78 		}
79 
80 	argc -= optind;
81 	argv += optind;
82 
83 	fp = stdin;
84 	filename = "stdin";
85 	rval = 0;
86 	do {
87 		if (*argv) {
88 			if ((fp = fopen(*argv, "r")) == NULL) {
89 				warn("%s", *argv);
90 				rval = 1;
91 				++argv;
92 				continue;
93 			}
94 			filename = *argv++;
95 		}
96 		while ((p = fgetwln(fp, &len)) != NULL) {
97 			if (p[len - 1] == '\n')
98 				--len;
99 			for (t = p + len - 1; t >= p; --t)
100 				putwchar(*t);
101 			putwchar('\n');
102 		}
103 		if (ferror(fp)) {
104 			warn("%s", filename);
105 			clearerr(fp);
106 			rval = 1;
107 		}
108 		(void)fclose(fp);
109 	} while(*argv);
110 	exit(rval);
111 }
112 
113 void
114 usage(void)
115 {
116 	(void)fprintf(stderr, "usage: rev [file ...]\n");
117 	exit(1);
118 }
119