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      1 /*	$NetBSD: rev.c,v 1.12 2011/09/16 15:39:28 joerg 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 1.12 2011/09/16 15:39:28 joerg 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 __dead static void usage(void);
     57 
     58 int
     59 main(int argc, char *argv[])
     60 {
     61 	const char *filename;
     62 	wchar_t *p, *t;
     63 	FILE *fp;
     64 	size_t len;
     65 	int ch, rval;
     66 
     67 	setlocale(LC_ALL, "");
     68 	setprogname(argv[0]);
     69 
     70 	while ((ch = getopt(argc, argv, "")) != -1)
     71 		switch(ch) {
     72 		case '?':
     73 		default:
     74 			usage();
     75 		}
     76 
     77 	argc -= optind;
     78 	argv += optind;
     79 
     80 	fp = stdin;
     81 	filename = "stdin";
     82 	rval = 0;
     83 	do {
     84 		if (*argv) {
     85 			if ((fp = fopen(*argv, "r")) == NULL) {
     86 				warn("%s", *argv);
     87 				rval = 1;
     88 				++argv;
     89 				continue;
     90 			}
     91 			filename = *argv++;
     92 		}
     93 		while ((p = fgetwln(fp, &len)) != NULL) {
     94 			if (p[len - 1] == L'\n')
     95 				--len;
     96 			t = p + len - 1;
     97 			for (t = p + len - 1; t >= p; --t)
     98 				putwchar(*t);
     99 			putwchar(L'\n');
    100 		}
    101 		if (ferror(fp)) {
    102 			warn("%s", filename);
    103 			rval = 1;
    104 		}
    105 		(void)fclose(fp);
    106 	} while(*argv);
    107 	exit(rval);
    108 }
    109 
    110 static void
    111 usage(void)
    112 {
    113 	(void)fprintf(stderr, "usage: %s [file ...]\n", getprogname());
    114 	exit(EXIT_FAILURE);
    115 }
    116