usr.bin/unvis/unvis.c

   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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)unvis.c  8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/unvis/unvis.c,v 1.5.2.1 2001/07/30 10:16:49 dd Exp $
  32  * $DragonFly: src/usr.bin/unvis/unvis.c,v 1.5 2005/02/19 00:32:01 liamfoy Exp $
  33  */
  34
  35 #include <err.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <vis.h>
  40
  41 static void process(FILE *, const char *);
  42 static void usage(void);
  43
  44 int
  45 main(int argc, char **argv)
  46 {
  47         FILE *fp;
  48         int ch;
  49
  50         while ((ch = getopt(argc, argv, "")) != -1)
  51                 switch(ch) {
  52                 case '?':
  53                 default:
  54                         usage();
  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                         else
  64                                 warn("%s", *argv);
  65                         argv++;
  66                 }
  67         else
  68                 process(stdin, "<stdin>");
  69         exit(0);
  70 }
  71
  72 static void
  73 usage(void)
  74 {
  75         fprintf(stderr, "usage: unvis [file ...]\n");
  76         exit(1);
  77 }
  78
  79 static void
  80 process(FILE *fp, const char *filename)
  81 {
  82         int offset = 0, c, ret;
  83         int state = 0;
  84         char outc;
  85
  86         while ((c = getc(fp)) != EOF) {
  87                 offset++;
  88         again:
  89                 switch(ret = unvis(&outc, c, &state, 0)) {
  90                 case UNVIS_VALID:
  91                         putchar(outc);
  92                         break;
  93                 case UNVIS_VALIDPUSH:
  94                         putchar(outc);
  95                         goto again;
  96                 case UNVIS_SYNBAD:
  97                         warnx("%s: offset: %d: can't decode", filename, offset);
  98                         state = 0;
  99                         break;
 100                 case 0:
 101                 case UNVIS_NOCHAR:
 102                         break;
 103                 default:
 104                         errx(1, "bad return value (%d), can't happen", ret);
 105                 }
 106         }
 107         if (unvis(&outc, (char)0, &state, UNVIS_END) == UNVIS_VALID)
 108                 putchar(outc);
 109 }