text_cmds/rev/rev.c

   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: src/usr.bin/rev/rev.c,v 1.12 2009/12/13 03:14:06 delphij Exp $");
  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 }