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unvis.c revision 1.5 
      1 /*	$NetBSD: unvis.c,v 1.5 1997/01/09 20:23:17 tls 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #ifndef lint
     37 static char copyright[] =
     38 "@(#) Copyright (c) 1989, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n";
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)unvis.c	8.1 (Berkeley) 6/6/93";
     45 #endif
     46 static char rcsid[] = "$NetBSD: unvis.c,v 1.5 1997/01/09 20:23:17 tls Exp $";
     47 #endif /* not lint */
     48 
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <err.h>
     52 #include <vis.h>
     53 
     54 void process __P((FILE *fp, const char *filename));
     55 
     56 int
     57 main(argc, argv)
     58 	int argc;
     59 	char *argv[];
     60 {
     61 	FILE *fp;
     62 	int ch;
     63 
     64 	while ((ch = getopt(argc, argv, "")) != EOF)
     65 		switch((char)ch) {
     66 		case '?':
     67 		default:
     68 			(void) fprintf(stderr, "usage: unvis [file...]\n");
     69 			exit(1);
     70 		}
     71 	argc -= optind;
     72 	argv += optind;
     73 
     74 	if (*argv)
     75 		while (*argv) {
     76 			if ((fp=fopen(*argv, "r")) != NULL)
     77 				process(fp, *argv);
     78 			else
     79 				warn("%s", *argv);
     80 			argv++;
     81 		}
     82 	else
     83 		process(stdin, "<stdin>");
     84 	exit(0);
     85 }
     86 
     87 void
     88 process(fp, filename)
     89 	FILE *fp;
     90 	const char *filename;
     91 {
     92 	register int offset = 0, c, ret;
     93 	int state = 0;
     94 	char outc;
     95 
     96 	while ((c = getc(fp)) != EOF) {
     97 		offset++;
     98 	again:
     99 		switch(ret = unvis(&outc, (char)c, &state, 0)) {
    100 		case UNVIS_VALID:
    101 			putchar(outc);
    102 			break;
    103 		case UNVIS_VALIDPUSH:
    104 			putchar(outc);
    105 			goto again;
    106 		case UNVIS_SYNBAD:
    107 			warnx("%s: offset: %d: can't decode", filename, offset);
    108 			state = 0;
    109 			break;
    110 		case 0:
    111 		case UNVIS_NOCHAR:
    112 			break;
    113 		default:
    114 			errx(1, "bad return value (%d), can't happen", ret);
    115 			/* NOTREACHED */
    116 		}
    117 	}
    118 	if (unvis(&outc, (char)0, &state, UNVIS_END) == UNVIS_VALID)
    119 		putchar(outc);
    120 }
    121