1/*-
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1989, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)unvis.c	8.1 (Berkeley) 6/6/93";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: src/usr.bin/unvis/unvis.c,v 1.9 2002/09/04 23:29:08 dwmalone Exp $";
46#endif /* not lint */
47
48#include <err.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <unistd.h>
52#include <vis.h>
53#include <sysexits.h>
54
55void process(FILE *, const char *);
56static void usage(void);
57
58int
59main(int argc, char *argv[])
60{
61	FILE *fp;
62	int ch;
63
64	while ((ch = getopt(argc, argv, "")) != -1)
65		switch((char)ch) {
66		case '?':
67		default:
68			usage();
69		}
70	argc -= optind;
71	argv += optind;
72
73	if (*argv)
74		while (*argv) {
75			if ((fp=fopen(*argv, "r")) != NULL)
76				process(fp, *argv);
77			else
78				warn("%s", *argv);
79			argv++;
80		}
81	else
82		process(stdin, "<stdin>");
83	exit(0);
84}
85
86static void
87usage(void)
88{
89	fprintf(stderr, "usage: unvis [file ...]\n");
90	exit(1);
91}
92
93void
94process(FILE *fp, const char *filename)
95{
96	int offset = 0, c, ret;
97	int state = 0;
98	char outc;
99
100	while ((c = getc(fp)) != EOF) {
101		offset++;
102	again:
103		switch(ret = unvis(&outc, (char)c, &state, 0)) {
104		case UNVIS_VALID:
105			putchar(outc);
106			break;
107		case UNVIS_VALIDPUSH:
108			putchar(outc);
109			goto again;
110		case UNVIS_SYNBAD:
111			warnx("%s: offset: %d: can't decode", filename, offset);
112			state = 0;
113			break;
114		case 0:
115		case UNVIS_NOCHAR:
116			break;
117		default:
118			errx(1, "bad return value (%d), can't happen", ret);
119		}
120	}
121	if (unvis(&outc, (char)0, &state, UNVIS_END) == UNVIS_VALID)
122		putchar(outc);
123
124	if (ferror(fp))
125		errx(EX_IOERR, "Error reading %s", fp);
126}
127