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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#) Copyright (c) 1987, 1992, 1993 The Regents of the University of California. All rights reserved.
30 * @(#)rev.c 8.3 (Berkeley) 5/4/95
31 */
32
33 #include <sys/types.h>
34
35 #include <err.h>
36 #include <locale.h>
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <unistd.h>
40 #include <wchar.h>
41
42 static void usage(void);
43 static int dorev(FILE *, const char *);
44
45 int
main(int argc,char ** argv)46 main(int argc, char **argv)
47 {
48 FILE *fp;
49 int ch, i, rval;
50
51 rval = 0;
52
53 setlocale(LC_ALL, "");
54
55 while ((ch = getopt(argc, argv, "")) != -1)
56 switch(ch) {
57 case '?':
58 default:
59 usage();
60 }
61
62 argc -= optind;
63 argv += optind;
64
65 if (argc == 0)
66 rval += dorev(stdin, "stdin");
67
68 for (i = 0; i < argc; ++i) {
69 if ((fp = fopen(argv[i], "r")) != NULL) {
70 rval += dorev(fp, argv[i]);
71 fclose(fp);
72 } else {
73 warn("failed to open %s", argv[i]);
74 rval++ ;
75 }
76 }
77
78 exit(rval != 0 ? 1 : 0);
79 }
80
81 static void
usage(void)82 usage(void)
83 {
84 fprintf(stderr, "usage: rev [file ...]\n");
85 exit(1);
86 }
87
88 static int
dorev(FILE * fp,const char * filepath)89 dorev(FILE *fp, const char *filepath)
90 {
91 const wchar_t *p, *t;
92 size_t len;
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
102 if (ferror(fp)) {
103 warn("%s", filepath);
104 /* Reset error indicator */
105 clearerr(fp);
106 return(1);
107 }
108
109 return(0);
110 }
111