usr.bin/rev/rev.c

   1 /*      $NetBSD: rev.c,v 1.10 2009/07/21 01:12:55 ahoka 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. 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/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1987, 1992, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)rev.c       8.3 (Berkeley) 5/4/95";
  41 #else
  42 __RCSID("$NetBSD: rev.c,v 1.10 2009/07/21 01:12:55 ahoka Exp $");
  43 #endif
  44 #endif /* not lint */
  45
  46 #include <sys/types.h>
  47
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <locale.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <unistd.h>
  54 #include <wchar.h>
  55
  56 static void usage(void);
  57 int main(int, char *[]);
  58
  59 int
  60 main(int argc, char *argv[])
  61 {
  62         const char *filename;
  63         wchar_t *p, *t;
  64         FILE *fp;
  65         size_t len;
  66         int ch, rval;
  67
  68         setlocale(LC_ALL, "");
  69         setprogname(argv[0]);
  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] == L'\n')
  96                                 --len;
  97                         t = p + len - 1;
  98                         for (t = p + len - 1; t >= p; --t)
  99                                 putwchar(*t);
 100                         putwchar(L'\n');
 101                 }
 102                 if (ferror(fp)) {
 103                         warn("%s", filename);
 104                         rval = 1;
 105                 }
 106                 (void)fclose(fp);
 107         } while(*argv);
 108         exit(rval);
 109 }
 110
 111 static void
 112 usage(void)
 113 {
 114         (void)fprintf(stderr, "usage: %s [file ...]\n", getprogname());
 115         exit(EXIT_FAILURE);
 116 }