usr.bin/vis/vis.c

   1 /*      $NetBSD: vis.c,v 1.14 2009/02/11 03:04:52 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[] = "@(#)vis.c       8.1 (Berkeley) 6/6/93";
  41 #endif
  42 __RCSID("$NetBSD: vis.c,v 1.14 2009/02/11 03:04:52 christos Exp $");
  43 #endif /* not lint */
  44
  45 #include <stdio.h>
  46 #include <string.h>
  47 #include <stdlib.h>
  48 #include <unistd.h>
  49 #include <err.h>
  50 #include <vis.h>
  51
  52 #include "extern.h"
  53
  54 static int eflags, fold, foldwidth = 80, none, markeol;
  55 #ifdef DEBUG
  56 int debug;
  57 #endif
  58 static char *extra;
  59
  60 static void process(FILE *);
  61
  62 int
  63 main(int argc, char *argv[])
  64 {
  65         FILE *fp;
  66         int ch;
  67         int rval;
  68
  69         while ((ch = getopt(argc, argv, "bcde:F:fhlmnostw")) != -1)
  70                 switch((char)ch) {
  71                 case 'b':
  72                         eflags |= VIS_NOSLASH;
  73                         break;
  74                 case 'c':
  75                         eflags |= VIS_CSTYLE;
  76                         break;
  77 #ifdef DEBUG
  78                 case 'd':
  79                         debug++;
  80                         break;
  81 #endif
  82                 case 'e':
  83                         extra = optarg;
  84                         break;
  85                 case 'F':
  86                         if ((foldwidth = atoi(optarg)) < 5) {
  87                                 errx(1, "can't fold lines to less than 5 cols");
  88                                 /* NOTREACHED */
  89                         }
  90                         markeol++;
  91                         break;
  92                 case 'f':
  93                         fold++;         /* fold output lines to 80 cols */
  94                         break;          /* using hidden newline */
  95                 case 'h':
  96                         eflags |= VIS_HTTPSTYLE;
  97                         break;
  98                 case 'l':
  99                         markeol++;      /* mark end of line with \$ */
 100                         break;
 101                 case 'm':
 102                         eflags |= VIS_MIMESTYLE;
 103                         if (foldwidth == 80)
 104                                 foldwidth = 76;
 105                         break;
 106                 case 'n':
 107                         none++;
 108                         break;
 109                 case 'o':
 110                         eflags |= VIS_OCTAL;
 111                         break;
 112                 case 's':
 113                         eflags |= VIS_SAFE;
 114                         break;
 115                 case 't':
 116                         eflags |= VIS_TAB;
 117                         break;
 118                 case 'w':
 119                         eflags |= VIS_WHITE;
 120                         break;
 121                 case '?':
 122                 default:
 123                         (void)fprintf(stderr,
 124                             "Usage: %s [-bcfhlmnostw] [-e extra]"
 125                             " [-F foldwidth] [file ...]\n", getprogname());
 126                         return 1;
 127                 }
 128
 129         if ((eflags & (VIS_HTTPSTYLE|VIS_MIMESTYLE)) ==
 130             (VIS_HTTPSTYLE|VIS_MIMESTYLE))
 131                 errx(1, "Can't specify -m and -h at the same time");
 132
 133         argc -= optind;
 134         argv += optind;
 135
 136         rval = 0;
 137
 138         if (*argv)
 139                 while (*argv) {
 140                         if ((fp = fopen(*argv, "r")) != NULL) {
 141                                 process(fp);
 142                                 (void)fclose(fp);
 143                         } else {
 144                                 warn("%s", *argv);
 145                                 rval = 1;
 146                         }
 147                         argv++;
 148                 }
 149         else
 150                 process(stdin);
 151         return rval;
 152 }
 153
 154 static void
 155 process(FILE *fp)
 156 {
 157         static int col = 0;
 158         static char nul[] = "\0";
 159         char *cp = nul + 1;     /* so *(cp-1) starts out != '\n' */
 160         int c, rachar;
 161         char buff[5];
 162
 163         c = getc(fp);
 164         while (c != EOF) {
 165                 rachar = getc(fp);
 166                 if (none) {
 167                         cp = buff;
 168                         *cp++ = c;
 169                         if (c == '\\')
 170                                 *cp++ = '\\';
 171                         *cp = '\0';
 172                 } else if (markeol && c == '\n') {
 173                         cp = buff;
 174                         if ((eflags & VIS_NOSLASH) == 0)
 175                                 *cp++ = '\\';
 176                         *cp++ = '$';
 177                         *cp++ = '\n';
 178                         *cp = '\0';
 179                 } else if (extra)
 180                         (void)svis(buff, (char)c, eflags, (char)rachar, extra);
 181                 else
 182                         (void)vis(buff, (char)c, eflags, (char)rachar);
 183
 184                 cp = buff;
 185                 if (fold) {
 186 #ifdef DEBUG
 187                         if (debug)
 188                                 (void)printf("<%02d,", col);
 189 #endif
 190                         col = foldit(cp, col, foldwidth, eflags);
 191 #ifdef DEBUG
 192                         if (debug)
 193                                 (void)printf("%02d>", col);
 194 #endif
 195                 }
 196                 do {
 197                         (void)putchar(*cp);
 198                 } while (*++cp);
 199                 c = rachar;
 200         }
 201         /*
 202          * terminate partial line with a hidden newline
 203          */
 204         if (fold && *(cp - 1) != '\n')
 205                 (void)printf(eflags & VIS_MIMESTYLE ? "=\n" : "\\\n");
 206 }