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      1 /*	$NetBSD: unvis.c,v 1.13 2010/11/27 19:46:25 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 1.13 2010/11/27 19:46:25 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 void process(FILE *, const char *, int);
     52 
     53 int
     54 main(int argc, char *argv[])
     55 {
     56 	FILE *fp;
     57 	int ch, eflags = 0;
     58 
     59 	setprogname(argv[0]);
     60 	while ((ch = getopt(argc, argv, "eHhm")) != -1)
     61 		switch((char)ch) {
     62 		case 'e':
     63 			eflags |= VIS_NOESCAPE;
     64 			break;
     65 		case 'H':
     66 			eflags |= VIS_HTTP1866;
     67 			break;
     68 		case 'h':
     69 			eflags |= VIS_HTTP1808;
     70 			break;
     71 		case 'm':
     72 			eflags |= VIS_MIMESTYLE;
     73 			break;
     74 		case '?':
     75 		default:
     76 			(void)fprintf(stderr,
     77 			    "Usage: %s [-e] [-Hh | -m] [file...]\n",
     78 			    getprogname());
     79 			return EXIT_FAILURE;
     80 		}
     81 	argc -= optind;
     82 	argv += optind;
     83 
     84 	switch (eflags & (VIS_HTTP1808|VIS_HTTP1866|VIS_MIMESTYLE)) {
     85 	case VIS_HTTP1808|VIS_MIMESTYLE:
     86 	case VIS_HTTP1866|VIS_MIMESTYLE:
     87 	case VIS_HTTP1808|VIS_HTTP1866|VIS_MIMESTYLE:
     88 		errx(EXIT_FAILURE, "Can't mix -m with -h and/or -H");
     89 		/*NOTREACHED*/
     90 	default:
     91 		break;
     92 	}
     93 
     94 	if (*argv)
     95 		while (*argv) {
     96 			if ((fp = fopen(*argv, "r")) != NULL)
     97 				process(fp, *argv, eflags);
     98 			else
     99 				warn("%s", *argv);
    100 			argv++;
    101 		}
    102 	else
    103 		process(stdin, "<stdin>", eflags);
    104 	return EXIT_SUCCESS;
    105 }
    106 
    107 static void
    108 process(FILE *fp, const char *filename, int eflags)
    109 {
    110 	int offset = 0, c, ret;
    111 	int state = 0;
    112 	char outc;
    113 
    114 	while ((c = getc(fp)) != EOF) {
    115 		offset++;
    116 	again:
    117 		switch(ret = unvis(&outc, (char)c, &state, eflags)) {
    118 		case UNVIS_VALID:
    119 			(void)putchar(outc);
    120 			break;
    121 		case UNVIS_VALIDPUSH:
    122 			(void)putchar(outc);
    123 			goto again;
    124 		case UNVIS_SYNBAD:
    125 			warnx("%s: offset: %d: can't decode", filename, offset);
    126 			state = 0;
    127 			break;
    128 		case 0:
    129 		case UNVIS_NOCHAR:
    130 			break;
    131 		default:
    132 			errx(1, "bad return value (%d), can't happen", ret);
    133 			/* NOTREACHED */
    134 		}
    135 	}
    136 	if (unvis(&outc, (char)0, &state, eflags | UNVIS_END) == UNVIS_VALID)
    137 		(void)putchar(outc);
    138 }
    139