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
main(int argc,char * argv[])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
process(FILE * fp,const char * filename,int eflags)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