/*      $NetBSD: rev.c,v 1.12 2011/09/16 15:39:28 joerg Exp $   */

/*-
* Copyright (c) 1987, 1992, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1987, 1992, 1993\
The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)rev.c       8.3 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: rev.c,v 1.12 2011/09/16 15:39:28 joerg Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>

#include <err.h>
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <wchar.h>

__dead static void usage(void);

int
main(int argc, char *argv[])
{
       const char *filename;
       wchar_t *p, *t;
       FILE *fp;
       size_t len;
       int ch, rval;

       setlocale(LC_ALL, "");
       setprogname(argv[0]);

       while ((ch = getopt(argc, argv, "")) != -1)
               switch(ch) {
               case '?':
               default:
                       usage();
               }

       argc -= optind;
       argv += optind;

       fp = stdin;
       filename = "stdin";
       rval = 0;
       do {
               if (*argv) {
                       if ((fp = fopen(*argv, "r")) == NULL) {
                               warn("%s", *argv);
                               rval = 1;
                               ++argv;
                               continue;
                       }
                       filename = *argv++;
               }
               while ((p = fgetwln(fp, &len)) != NULL) {
                       if (p[len - 1] == L'\n')
                               --len;
                       t = p + len - 1;
                       for (t = p + len - 1; t >= p; --t)
                               putwchar(*t);
                       putwchar(L'\n');
               }
               if (ferror(fp)) {
                       warn("%s", filename);
                       rval = 1;
               }
               (void)fclose(fp);
       } while(*argv);
       exit(rval);
}

static void
usage(void)
{
       (void)fprintf(stderr, "usage: %s [file ...]\n", getprogname());
       exit(EXIT_FAILURE);
}