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unvis.c revision 1.12 
      1 /*	$NetBSD: unvis.c,v 1.12 2009/02/10 23:06:31 christos 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\
     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[] = "@(#)unvis.c	8.1 (Berkeley) 6/6/93";
     41 #endif
     42 __RCSID("$NetBSD: unvis.c,v 1.12 2009/02/10 23:06:31 christos 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 static int eflags;
     52 
     53 static void process(FILE *fp, const char *filename);
     54 
     55 int
     56 main(int argc, char *argv[])
     57 {
     58 	FILE *fp;
     59 	int ch;
     60 
     61 	setprogname(argv[0]);
     62 	while ((ch = getopt(argc, argv, "hm")) != -1)
     63 		switch((char)ch) {
     64 		case 'h':
     65 			eflags |= VIS_HTTPSTYLE;
     66 			break;
     67 		case 'm':
     68 			eflags |= VIS_MIMESTYLE;
     69 			break;
     70 		case '?':
     71 		default:
     72 			(void)fprintf(stderr,
     73 			    "Usage: %s [-h|-m] [file...]\n", getprogname());
     74 			return 1;
     75 		}
     76 	argc -= optind;
     77 	argv += optind;
     78 
     79 	if ((eflags & (VIS_HTTPSTYLE|VIS_MIMESTYLE)) ==
     80 	    (VIS_HTTPSTYLE|VIS_MIMESTYLE))
     81 		errx(1, "Can't specify -m and -h at the same time");
     82 
     83 	if (*argv)
     84 		while (*argv) {
     85 			if ((fp = fopen(*argv, "r")) != NULL)
     86 				process(fp, *argv);
     87 			else
     88 				warn("%s", *argv);
     89 			argv++;
     90 		}
     91 	else
     92 		process(stdin, "<stdin>");
     93 	return 0;
     94 }
     95 
     96 static void
     97 process(FILE *fp, const char *filename)
     98 {
     99 	int offset = 0, c, ret;
    100 	int state = 0;
    101 	char outc;
    102 
    103 	while ((c = getc(fp)) != EOF) {
    104 		offset++;
    105 	again:
    106 		switch(ret = unvis(&outc, (char)c, &state, eflags)) {
    107 		case UNVIS_VALID:
    108 			(void)putchar(outc);
    109 			break;
    110 		case UNVIS_VALIDPUSH:
    111 			(void)putchar(outc);
    112 			goto again;
    113 		case UNVIS_SYNBAD:
    114 			warnx("%s: offset: %d: can't decode", filename, offset);
    115 			state = 0;
    116 			break;
    117 		case 0:
    118 		case UNVIS_NOCHAR:
    119 			break;
    120 		default:
    121 			errx(1, "bad return value (%d), can't happen", ret);
    122 			/* NOTREACHED */
    123 		}
    124 	}
    125 	if (unvis(&outc, (char)0, &state, eflags | UNVIS_END) == UNVIS_VALID)
    126 		(void)putchar(outc);
    127 }
    128