1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/types.h>
33
34 #include <err.h>
35 #include <errno.h>
36 #include <locale.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <unistd.h>
41 #include <wchar.h>
42
43 static void usage(void) __dead2;
44
45 int
main(int argc,char * argv[])46 main(int argc, char *argv[])
47 {
48 const char *filename;
49 wchar_t *p, *t;
50 FILE *fp;
51 size_t len;
52 int ch, rval;
53
54 setlocale(LC_ALL, "");
55
56 while ((ch = getopt(argc, argv, "")) != -1)
57 switch(ch) {
58 case '?':
59 default:
60 usage();
61 }
62
63 argc -= optind;
64 argv += optind;
65
66 fp = stdin;
67 filename = "stdin";
68 rval = 0;
69 do {
70 if (*argv) {
71 if ((fp = fopen(*argv, "r")) == NULL) {
72 warn("%s", *argv);
73 rval = 1;
74 ++argv;
75 continue;
76 }
77 filename = *argv++;
78 }
79 while ((p = fgetwln(fp, &len)) != NULL) {
80 if (p[len - 1] == '\n')
81 --len;
82 for (t = p + len - 1; t >= p; --t)
83 putwchar(*t);
84 putwchar('\n');
85 }
86 if (ferror(fp)) {
87 warn("%s", filename);
88 clearerr(fp);
89 rval = 1;
90 }
91 (void)fclose(fp);
92 } while(*argv);
93 exit(rval);
94 }
95
96 void
usage(void)97 usage(void)
98 {
99 (void)fprintf(stderr, "usage: rev [file ...]\n");
100 exit(1);
101 }
102