usr.bin/unvis/unvis.c

   1 /*      $NetBSD: unvis.c,v 1.11 2008/07/21 14:19:27 lukem 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 <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1989, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)unvis.c     8.1 (Berkeley) 6/6/93";
  41 #endif
  42 __RCSID("$NetBSD: unvis.c,v 1.11 2008/07/21 14:19:27 lukem Exp $");
  43 #endif /* not lint */
  44
  45 #include <err.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <unistd.h>
  49 #include <vis.h>
  50
  51 static int eflags;
  52
  53 static void process(FILE *fp, const char *filename);
  54
  55 int
  56 main(int argc, char *argv[])
  57 {
  58         FILE *fp;
  59         int ch;
  60
  61         setprogname(argv[0]);
  62         while ((ch = getopt(argc, argv, "hm")) != -1)
  63                 switch((char)ch) {
  64                 case 'h':
  65                         eflags |= VIS_HTTPSTYLE;
  66                         break;
  67                 case 'm':
  68                         eflags |= VIS_MIMESTYLE;
  69                         break;
  70                 case '?':
  71                 default:
  72                         (void)fprintf(stderr,
  73                             "Usage: %s [-h|-m] [file...]\n", getprogname());
  74                         return 1;
  75                 }
  76         argc -= optind;
  77         argv += optind;
  78
  79         if ((eflags & (VIS_HTTPSTYLE|VIS_MIMESTYLE)) ==
  80             (VIS_HTTPSTYLE|VIS_MIMESTYLE))
  81                 errx(1, "Can't specify -m and -h at the same time");
  82
  83         if (*argv)
  84                 while (*argv) {
  85                         if ((fp = fopen(*argv, "r")) != NULL)
  86                                 process(fp, *argv);
  87                         else
  88                                 warn("%s", *argv);
  89                         argv++;
  90                 }
  91         else
  92                 process(stdin, "<stdin>");
  93         return 0;
  94 }
  95
  96 static void
  97 process(FILE *fp, const char *filename)
  98 {
  99         int offset = 0, c, ret;
 100         int state = 0;
 101         char outc;
 102
 103         while ((c = getc(fp)) != EOF) {
 104                 offset++;
 105         again:
 106                 switch(ret = unvis(&outc, (char)c, &state, eflags)) {
 107                 case UNVIS_VALID:
 108                         (void)putchar(outc);
 109                         break;
 110                 case UNVIS_VALIDPUSH:
 111                         (void)putchar(outc);
 112                         goto again;
 113                 case UNVIS_SYNBAD:
 114                         warnx("%s: offset: %d: can't decode", filename, offset);
 115                         state = 0;
 116                         break;
 117                 case 0:
 118                 case UNVIS_NOCHAR:
 119                         break;
 120                 default:
 121                         errx(1, "bad return value (%d), can't happen", ret);
 122                         /* NOTREACHED */
 123                 }
 124         }
 125         if (unvis(&outc, (char)0, &state, eflags | UNVIS_END) == UNVIS_VALID)
 126                 (void)putchar(outc);
 127 }