/*-
 * 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.
 *
 * @(#) Copyright (c) 1987, 1992, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)rev.c    8.3 (Berkeley) 5/4/95
 */

#include <sys/types.h>

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

static void     usage(void);
static int      dorev(FILE *, const char *);

int
main(int argc, char **argv)
{
        FILE *fp;
        int ch, i, rval;

        rval = 0;

        setlocale(LC_ALL, "");

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

        argc -= optind;
        argv += optind;

        if (argc == 0)
                rval += dorev(stdin, "stdin");

        for (i = 0; i < argc; ++i) {
                if ((fp = fopen(argv[i], "r")) != NULL) {
                        rval += dorev(fp, argv[i]);
                        fclose(fp);
                } else {
                        warn("failed to open %s", argv[i]);
                        rval++ ;
                }
        }

        exit(rval != 0 ? 1 : 0);
}

static void
usage(void)
{
        fprintf(stderr, "usage: rev [file ...]\n");
        exit(1);
}

static int 
dorev(FILE *fp, const char *filepath)
{
        const wchar_t *p, *t;
        size_t len;
        
        while ((p = fgetwln(fp, &len)) != NULL) {
                        if (p[len - 1] == '\n')
                                --len;
                        for (t = p + len - 1; t >= p; --t)
                                putwchar(*t);
                        putwchar('\n');
        }
        
        if (ferror(fp)) {
                warn("%s", filepath);
                /* Reset error indicator */
                clearerr(fp);
                return(1);
        }

        return(0);
}