usr.bin/unvis/unvis.c

   1 /*      $NetBSD: unvis.c,v 1.13 2010/11/27 19:46:25 christos 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 1.13 2010/11/27 19:46:25 christos 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 void process(FILE *, const char *, int);
  52
  53 int
  54 main(int argc, char *argv[])
  55 {
  56         FILE *fp;
  57         int ch, eflags = 0;
  58
  59         setprogname(argv[0]);
  60         while ((ch = getopt(argc, argv, "eHhm")) != -1)
  61                 switch((char)ch) {
  62                 case 'e':
  63                         eflags |= VIS_NOESCAPE;
  64                         break;
  65                 case 'H':
  66                         eflags |= VIS_HTTP1866;
  67                         break;
  68                 case 'h':
  69                         eflags |= VIS_HTTP1808;
  70                         break;
  71                 case 'm':
  72                         eflags |= VIS_MIMESTYLE;
  73                         break;
  74                 case '?':
  75                 default:
  76                         (void)fprintf(stderr,
  77                             "Usage: %s [-e] [-Hh | -m] [file...]\n",
  78                             getprogname());
  79                         return EXIT_FAILURE;
  80                 }
  81         argc -= optind;
  82         argv += optind;
  83
  84         switch (eflags & (VIS_HTTP1808|VIS_HTTP1866|VIS_MIMESTYLE)) {
  85         case VIS_HTTP1808|VIS_MIMESTYLE:
  86         case VIS_HTTP1866|VIS_MIMESTYLE:
  87         case VIS_HTTP1808|VIS_HTTP1866|VIS_MIMESTYLE:
  88                 errx(EXIT_FAILURE, "Can't mix -m with -h and/or -H");
  89                 /*NOTREACHED*/
  90         default:
  91                 break;
  92         }
  93
  94         if (*argv)
  95                 while (*argv) {
  96                         if ((fp = fopen(*argv, "r")) != NULL)
  97                                 process(fp, *argv, eflags);
  98                         else
  99                                 warn("%s", *argv);
 100                         argv++;
 101                 }
 102         else
 103                 process(stdin, "<stdin>", eflags);
 104         return EXIT_SUCCESS;
 105 }
 106
 107 static void
 108 process(FILE *fp, const char *filename, int eflags)
 109 {
 110         int offset = 0, c, ret;
 111         int state = 0;
 112         char outc;
 113
 114         while ((c = getc(fp)) != EOF) {
 115                 offset++;
 116         again:
 117                 switch(ret = unvis(&outc, (char)c, &state, eflags)) {
 118                 case UNVIS_VALID:
 119                         (void)putchar(outc);
 120                         break;
 121                 case UNVIS_VALIDPUSH:
 122                         (void)putchar(outc);
 123                         goto again;
 124                 case UNVIS_SYNBAD:
 125                         warnx("%s: offset: %d: can't decode", filename, offset);
 126                         state = 0;
 127                         break;
 128                 case 0:
 129                 case UNVIS_NOCHAR:
 130                         break;
 131                 default:
 132                         errx(1, "bad return value (%d), can't happen", ret);
 133                         /* NOTREACHED */
 134                 }
 135         }
 136         if (unvis(&outc, (char)0, &state, eflags | UNVIS_END) == UNVIS_VALID)
 137                 (void)putchar(outc);
 138 }