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 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 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