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
40static 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
51static void process(FILE *, const char *, int);
52
53int
54main(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
107static void
108process(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