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unvis.c revision 1.9 
      1 /*	$NetBSD: unvis.c,v 1.9 2003/08/07 11:16:56 agc Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1989, 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) 1989, 1993\n\
     35 	The Regents of the University of California.  All rights reserved.\n");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)unvis.c	8.1 (Berkeley) 6/6/93";
     41 #endif
     42 __RCSID("$NetBSD: unvis.c,v 1.9 2003/08/07 11:16:56 agc Exp $");
     43 #endif /* not lint */
     44 
     45 #include <err.h>
     46 #include <stdio.h>
     47 #include <stdlib.h>
     48 #include <unistd.h>
     49 #include <vis.h>
     50 
     51 int	main __P((int, char **));
     52 void process __P((FILE *fp, const char *filename));
     53 
     54 int
     55 main(argc, argv)
     56 	int argc;
     57 	char *argv[];
     58 {
     59 	FILE *fp;
     60 	int ch;
     61 
     62 	while ((ch = getopt(argc, argv, "")) != -1)
     63 		switch((char)ch) {
     64 		case '?':
     65 		default:
     66 			(void) fprintf(stderr, "usage: unvis [file...]\n");
     67 			exit(1);
     68 		}
     69 	argc -= optind;
     70 	argv += optind;
     71 
     72 	if (*argv)
     73 		while (*argv) {
     74 			if ((fp=fopen(*argv, "r")) != NULL)
     75 				process(fp, *argv);
     76 			else
     77 				warn("%s", *argv);
     78 			argv++;
     79 		}
     80 	else
     81 		process(stdin, "<stdin>");
     82 	exit(0);
     83 }
     84 
     85 void
     86 process(fp, filename)
     87 	FILE *fp;
     88 	const char *filename;
     89 {
     90 	int offset = 0, c, ret;
     91 	int state = 0;
     92 	char outc;
     93 
     94 	while ((c = getc(fp)) != EOF) {
     95 		offset++;
     96 	again:
     97 		switch(ret = unvis(&outc, (char)c, &state, 0)) {
     98 		case UNVIS_VALID:
     99 			putchar(outc);
    100 			break;
    101 		case UNVIS_VALIDPUSH:
    102 			putchar(outc);
    103 			goto again;
    104 		case UNVIS_SYNBAD:
    105 			warnx("%s: offset: %d: can't decode", filename, offset);
    106 			state = 0;
    107 			break;
    108 		case 0:
    109 		case UNVIS_NOCHAR:
    110 			break;
    111 		default:
    112 			errx(1, "bad return value (%d), can't happen", ret);
    113 			/* NOTREACHED */
    114 		}
    115 	}
    116 	if (unvis(&outc, (char)0, &state, UNVIS_END) == UNVIS_VALID)
    117 		putchar(outc);
    118 }
    119