text_cmds/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
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1989, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)unvis.c     8.1 (Berkeley) 6/6/93";
  43 #endif
  44 static const char rcsid[] =
  45   "$FreeBSD: src/usr.bin/unvis/unvis.c,v 1.9 2002/09/04 23:29:08 dwmalone Exp $";
  46 #endif /* not lint */
  47
  48 #include <err.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <unistd.h>
  52 #include <vis.h>
  53 #include <sysexits.h>
  54
  55 void process(FILE *, const char *);
  56 static void usage(void);
  57
  58 int
  59 main(int argc, char *argv[])
  60 {
  61         FILE *fp;
  62         int ch;
  63
  64         while ((ch = getopt(argc, argv, "")) != -1)
  65                 switch((char)ch) {
  66                 case '?':
  67                 default:
  68                         usage();
  69                 }
  70         argc -= optind;
  71         argv += optind;
  72
  73         if (*argv)
  74                 while (*argv) {
  75                         if ((fp=fopen(*argv, "r")) != NULL)
  76                                 process(fp, *argv);
  77                         else
  78                                 warn("%s", *argv);
  79                         argv++;
  80                 }
  81         else
  82                 process(stdin, "<stdin>");
  83         exit(0);
  84 }
  85
  86 static void
  87 usage(void)
  88 {
  89         fprintf(stderr, "usage: unvis [file ...]\n");
  90         exit(1);
  91 }
  92
  93 void
  94 process(FILE *fp, const char *filename)
  95 {
  96         int offset = 0, c, ret;
  97         int state = 0;
  98         char outc;
  99
 100         while ((c = getc(fp)) != EOF) {
 101                 offset++;
 102         again:
 103                 switch(ret = unvis(&outc, (char)c, &state, 0)) {
 104                 case UNVIS_VALID:
 105                         putchar(outc);
 106                         break;
 107                 case UNVIS_VALIDPUSH:
 108                         putchar(outc);
 109                         goto again;
 110                 case UNVIS_SYNBAD:
 111                         warnx("%s: offset: %d: can't decode", filename, offset);
 112                         state = 0;
 113                         break;
 114                 case 0:
 115                 case UNVIS_NOCHAR:
 116                         break;
 117                 default:
 118                         errx(1, "bad return value (%d), can't happen", ret);
 119                 }
 120         }
 121         if (unvis(&outc, (char)0, &state, UNVIS_END) == UNVIS_VALID)
 122                 putchar(outc);
 123
 124         if (ferror(fp))
 125                 errx(EX_IOERR, "Error reading %s", fp);
 126 }