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 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1987, 1992, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #if 0
39 #ifndef lint
40 static char sccsid[] = "@(#)rev.c 8.3 (Berkeley) 5/4/95";
41 #endif /* not lint */
42 #endif
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD: stable/12/usr.bin/rev/rev.c 326025 2017-11-20 19:49:47Z pfg $");
46
47 #include <sys/types.h>
48
49 #include <err.h>
50 #include <errno.h>
51 #include <locale.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55 #include <unistd.h>
56 #include <wchar.h>
57
58 static void usage(void);
59
60 int
main(int argc,char * argv[])61 main(int argc, char *argv[])
62 {
63 const char *filename;
64 wchar_t *p, *t;
65 FILE *fp;
66 size_t len;
67 int ch, rval;
68
69 setlocale(LC_ALL, "");
70
71 while ((ch = getopt(argc, argv, "")) != -1)
72 switch(ch) {
73 case '?':
74 default:
75 usage();
76 }
77
78 argc -= optind;
79 argv += optind;
80
81 fp = stdin;
82 filename = "stdin";
83 rval = 0;
84 do {
85 if (*argv) {
86 if ((fp = fopen(*argv, "r")) == NULL) {
87 warn("%s", *argv);
88 rval = 1;
89 ++argv;
90 continue;
91 }
92 filename = *argv++;
93 }
94 while ((p = fgetwln(fp, &len)) != NULL) {
95 if (p[len - 1] == '\n')
96 --len;
97 for (t = p + len - 1; t >= p; --t)
98 putwchar(*t);
99 putwchar('\n');
100 }
101 if (ferror(fp)) {
102 warn("%s", filename);
103 clearerr(fp);
104 rval = 1;
105 }
106 (void)fclose(fp);
107 } while(*argv);
108 exit(rval);
109 }
110
111 void
usage(void)112 usage(void)
113 {
114 (void)fprintf(stderr, "usage: rev [file ...]\n");
115 exit(1);
116 }
117