1 /* $OpenBSD: unvis.c,v 1.14 2015/10/09 01:37:09 deraadt 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 case '?': 52 default: 53 (void) fprintf(stderr, "usage: unvis [file ...]\n"); 54 exit(1); 55 } 56 argc -= optind; 57 argv += optind; 58 59 if (*argv) 60 while (*argv) { 61 if ((fp=fopen(*argv, "r")) != NULL) { 62 process(fp, *argv); 63 fclose(fp); 64 } else 65 warn("%s", *argv); 66 argv++; 67 } 68 else { 69 if (pledge("stdio", NULL) == -1) 70 err(1, "pledge"); 71 72 process(stdin, "<stdin>"); 73 } 74 exit(0); 75 } 76 77 void 78 process(FILE *fp, const char *filename) 79 { 80 int offset = 0, c, ret; 81 int state = 0; 82 char outc; 83 84 while ((c = getc(fp)) != EOF) { 85 offset++; 86 again: 87 switch(ret = unvis(&outc, (char)c, &state, 0)) { 88 case UNVIS_VALID: 89 putchar(outc); 90 break; 91 case UNVIS_VALIDPUSH: 92 putchar(outc); 93 goto again; 94 case UNVIS_SYNBAD: 95 warnx("%s: offset: %d: can't decode", filename, offset); 96 state = 0; 97 break; 98 case 0: 99 case UNVIS_NOCHAR: 100 break; 101 default: 102 errx(1, "bad return value (%d), can't happen", ret); 103 /* NOTREACHED */ 104 } 105 } 106 if (unvis(&outc, (char)0, &state, UNVIS_END) == UNVIS_VALID) 107 putchar(outc); 108 } 109