1 /* $OpenBSD: unvis.c,v 1.15 2022/12/04 23:50:50 cheloha 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 <err.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <unistd.h>
36 #include <vis.h>
37
38 void process(FILE *fp, const char *filename);
39
40 int
main(int argc,char * argv[])41 main(int argc, char *argv[])
42 {
43 FILE *fp;
44 int ch;
45
46 if (pledge("stdio rpath", NULL) == -1)
47 err(1, "pledge");
48
49 while ((ch = getopt(argc, argv, "")) != -1)
50 switch(ch) {
51 default:
52 (void) fprintf(stderr, "usage: unvis [file ...]\n");
53 exit(1);
54 }
55 argc -= optind;
56 argv += optind;
57
58 if (*argv)
59 while (*argv) {
60 if ((fp=fopen(*argv, "r")) != NULL) {
61 process(fp, *argv);
62 fclose(fp);
63 } else
64 warn("%s", *argv);
65 argv++;
66 }
67 else {
68 if (pledge("stdio", NULL) == -1)
69 err(1, "pledge");
70
71 process(stdin, "<stdin>");
72 }
73 exit(0);
74 }
75
76 void
process(FILE * fp,const char * filename)77 process(FILE *fp, const char *filename)
78 {
79 int offset = 0, c, ret;
80 int state = 0;
81 char outc;
82
83 while ((c = getc(fp)) != EOF) {
84 offset++;
85 again:
86 switch(ret = unvis(&outc, (char)c, &state, 0)) {
87 case UNVIS_VALID:
88 putchar(outc);
89 break;
90 case UNVIS_VALIDPUSH:
91 putchar(outc);
92 goto again;
93 case UNVIS_SYNBAD:
94 warnx("%s: offset: %d: can't decode", filename, offset);
95 state = 0;
96 break;
97 case 0:
98 case UNVIS_NOCHAR:
99 break;
100 default:
101 errx(1, "bad return value (%d), can't happen", ret);
102 /* NOTREACHED */
103 }
104 }
105 if (unvis(&outc, (char)0, &state, UNVIS_END) == UNVIS_VALID)
106 putchar(outc);
107 }
108