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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)unvis.c  8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/unvis/unvis.c,v 1.5.2.1 2001/07/30 10:16:49 dd Exp $
  36  * $DragonFly: src/usr.bin/unvis/unvis.c,v 1.5 2005/02/19 00:32:01 liamfoy Exp $
  37  */
  38
  39 #include <err.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <vis.h>
  44
  45 static void process(FILE *, const char *);
  46 static void usage(void);
  47
  48 int
  49 main(int argc, char **argv)
  50 {
  51         FILE *fp;
  52         int ch;
  53
  54         while ((ch = getopt(argc, argv, "")) != -1)
  55                 switch(ch) {
  56                 case '?':
  57                 default:
  58                         usage();
  59                 }
  60         argc -= optind;
  61         argv += optind;
  62
  63         if (*argv)
  64                 while (*argv) {
  65                         if ((fp = fopen(*argv, "r")) != NULL)
  66                                 process(fp, *argv);
  67                         else
  68                                 warn("%s", *argv);
  69                         argv++;
  70                 }
  71         else
  72                 process(stdin, "<stdin>");
  73         exit(0);
  74 }
  75
  76 static void
  77 usage(void)
  78 {
  79         fprintf(stderr, "usage: unvis [file ...]\n");
  80         exit(1);
  81 }
  82
  83 static void
  84 process(FILE *fp, const char *filename)
  85 {
  86         int offset = 0, c, ret;
  87         int state = 0;
  88         char outc;
  89
  90         while ((c = getc(fp)) != EOF) {
  91                 offset++;
  92         again:
  93                 switch(ret = unvis(&outc, c, &state, 0)) {
  94                 case UNVIS_VALID:
  95                         putchar(outc);
  96                         break;
  97                 case UNVIS_VALIDPUSH:
  98                         putchar(outc);
  99                         goto again;
 100                 case UNVIS_SYNBAD:
 101                         warnx("%s: offset: %d: can't decode", filename, offset);
 102                         state = 0;
 103                         break;
 104                 case 0:
 105                 case UNVIS_NOCHAR:
 106                         break;
 107                 default:
 108                         errx(1, "bad return value (%d), can't happen", ret);
 109                 }
 110         }
 111         if (unvis(&outc, (char)0, &state, UNVIS_END) == UNVIS_VALID)
 112                 putchar(outc);
 113 }