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  * $NetBSD: unvis.c,v 1.13 2010/11/27 19:46:25 christos Exp $
  32  */
  33
  34 #include <err.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <unistd.h>
  38 #include <vis.h>
  39
  40 static void process(FILE *, const char *, int);
  41
  42 int
  43 main(int argc, char *argv[])
  44 {
  45         FILE *fp;
  46         int ch, eflags = 0;
  47
  48         setprogname(argv[0]);
  49         while ((ch = getopt(argc, argv, "eHhm")) != -1)
  50                 switch((char)ch) {
  51                 case 'e':
  52                         eflags |= VIS_NOESCAPE;
  53                         break;
  54                 case 'H':
  55                         eflags |= VIS_HTTP1866;
  56                         break;
  57                 case 'h':
  58                         eflags |= VIS_HTTP1808;
  59                         break;
  60                 case 'm':
  61                         eflags |= VIS_MIMESTYLE;
  62                         break;
  63                 case '?':
  64                 default:
  65                         fprintf(stderr,
  66                             "usage: %s [-e] [-Hh | -m] [file...]\n",
  67                             getprogname());
  68                         return EXIT_FAILURE;
  69                 }
  70         argc -= optind;
  71         argv += optind;
  72
  73         switch (eflags & (VIS_HTTP1808|VIS_HTTP1866|VIS_MIMESTYLE)) {
  74         case VIS_HTTP1808|VIS_MIMESTYLE:
  75         case VIS_HTTP1866|VIS_MIMESTYLE:
  76         case VIS_HTTP1808|VIS_HTTP1866|VIS_MIMESTYLE:
  77                 errx(EXIT_FAILURE, "Can't mix -m with -h and/or -H");
  78         default:
  79                 break;
  80         }
  81
  82         if (*argv)
  83                 while (*argv) {
  84                         if ((fp = fopen(*argv, "r")) != NULL)
  85                                 process(fp, *argv, eflags);
  86                         else
  87                                 warn("%s", *argv);
  88                         argv++;
  89                 }
  90         else
  91                 process(stdin, "<stdin>", eflags);
  92         return EXIT_SUCCESS;
  93 }
  94
  95 static void
  96 process(FILE *fp, const char *filename, int eflags)
  97 {
  98         int offset = 0, c, ret;
  99         int state = 0;
 100         char outc;
 101
 102         while ((c = getc(fp)) != EOF) {
 103                 offset++;
 104         again:
 105                 switch(ret = unvis(&outc, (char)c, &state, eflags)) {
 106                 case UNVIS_VALID:
 107                         putchar(outc);
 108                         break;
 109                 case UNVIS_VALIDPUSH:
 110                         putchar(outc);
 111                         goto again;
 112                 case UNVIS_SYNBAD:
 113                         warnx("%s: offset: %d: can't decode", filename, offset);
 114                         state = 0;
 115                         break;
 116                 case 0:
 117                 case UNVIS_NOCHAR:
 118                         break;
 119                 default:
 120                         errx(1, "bad return value (%d), can't happen", ret);
 121                 }
 122         }
 123         if (unvis(&outc, (char)0, &state, eflags | UNVIS_END) == UNVIS_VALID)
 124                 putchar(outc);
 125 }