usr.bin/vis/vis.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  * @(#)vis.c    8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/vis/vis.c,v 1.6 1999/08/28 01:07:25 peter Exp $
  32  */
  33
  34 #include <err.h>
  35 #include <locale.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <unistd.h>
  39 #include <vis.h>
  40
  41 #include "extern.h"
  42
  43 int eflags, fold, foldwidth=80, none, markeol, debug;
  44
  45 void process(FILE *);
  46 static void usage(void);
  47
  48 int
  49 main(int argc, char **argv)
  50 {
  51         FILE *fp;
  52         int ch;
  53
  54         (void) setlocale(LC_CTYPE, "");
  55
  56         while ((ch = getopt(argc, argv, "nwctsobfF:ld")) != -1)
  57                 switch((char)ch) {
  58                 case 'n':
  59                         none++;
  60                         break;
  61                 case 'w':
  62                         eflags |= VIS_WHITE;
  63                         break;
  64                 case 'c':
  65                         eflags |= VIS_CSTYLE;
  66                         break;
  67                 case 't':
  68                         eflags |= VIS_TAB;
  69                         break;
  70                 case 's':
  71                         eflags |= VIS_SAFE;
  72                         break;
  73                 case 'o':
  74                         eflags |= VIS_OCTAL;
  75                         break;
  76                 case 'b':
  77                         eflags |= VIS_NOSLASH;
  78                         break;
  79                 case 'F':
  80                         if ((foldwidth = atoi(optarg))<5)
  81                                 errx(1, "can't fold lines to less than 5 cols");
  82                         /*FALLTHROUGH*/
  83                 case 'f':
  84                         fold++;         /* fold output lines to 80 cols */
  85                         break;          /* using hidden newline */
  86                 case 'l':
  87                         markeol++;      /* mark end of line with \$ */
  88                         break;
  89 #ifdef DEBUG
  90                 case 'd':
  91                         debug++;
  92                         break;
  93 #endif
  94                 case '?':
  95                 default:
  96                         usage();
  97                 }
  98         argc -= optind;
  99         argv += optind;
 100
 101         if (*argv)
 102                 while (*argv) {
 103                         if ((fp=fopen(*argv, "r")) != NULL)
 104                                 process(fp);
 105                         else
 106                                 warn("%s", *argv);
 107                         argv++;
 108                 }
 109         else
 110                 process(stdin);
 111         exit(0);
 112 }
 113
 114
 115 static void
 116 usage(void)
 117 {
 118 #ifdef DEBUG
 119         fprintf(stderr, "usage: vis [-cbflnostwd] [-F foldwidth] [file ...]\n");
 120 #else
 121         fprintf(stderr, "usage: vis [-cbflnostw] [-F foldwidth] [file ...]\n");
 122 #endif
 123         exit(1);
 124 }
 125
 126 void
 127 process(FILE *fp)
 128 {
 129         static int col = 0;
 130         static char nul[] = "\0";
 131         char *cp = nul + 1;             /* so *(cp-1) starts out != '\n' */
 132         int c, rachar;
 133         char buff[5];
 134
 135         c = getc(fp);
 136         while (c != EOF) {
 137                 rachar = getc(fp);
 138                 if (none) {
 139                         cp = buff;
 140                         *cp++ = c;
 141                         if (c == '\\')
 142                                 *cp++ = '\\';
 143                         *cp = '\0';
 144                 } else if (markeol && c == '\n') {
 145                         cp = buff;
 146                         if ((eflags & VIS_NOSLASH) == 0)
 147                                 *cp++ = '\\';
 148                         *cp++ = '$';
 149                         *cp++ = '\n';
 150                         *cp = '\0';
 151                 } else
 152                         (void) vis(buff, (char)c, eflags, (char)rachar);
 153
 154                 cp = buff;
 155                 if (fold) {
 156 #ifdef DEBUG
 157                         if (debug)
 158                                 printf("<%02d,", col);
 159 #endif
 160                         col = foldit(cp, col, foldwidth);
 161 #ifdef DEBUG
 162                         if (debug)
 163                                 printf("%02d>", col);
 164 #endif
 165                 }
 166                 do {
 167                         putchar(*cp);
 168                 } while (*++cp);
 169                 c = rachar;
 170         }
 171         /*
 172          * terminate partial line with a hidden newline
 173          */
 174         if (fold && *(cp-1) != '\n')
 175                 printf("\\\n");
 176 }