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. 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 #include <sys/cdefs.h>
  35
  36 __FBSDID("$FreeBSD$");
  37
  38 #ifndef lint
  39 static const char copyright[] =
  40 "@(#) Copyright (c) 1989, 1993\n\
  41         The Regents of the University of California.  All rights reserved.\n";
  42 #endif
  43
  44 #ifndef lint
  45 static const char sccsid[] = "@(#)vis.c 8.1 (Berkeley) 6/6/93";
  46 #endif
  47
  48 #include <err.h>
  49 #include <locale.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <unistd.h>
  53 #include <vis.h>
  54
  55 #include "extern.h"
  56
  57 int eflags, fold, foldwidth=80, none, markeol, debug;
  58
  59 void process(FILE *);
  60 static void usage(void);
  61
  62 int
  63 main(int argc, char *argv[])
  64 {
  65         FILE *fp;
  66         int ch;
  67
  68         (void) setlocale(LC_CTYPE, "");
  69
  70         while ((ch = getopt(argc, argv, "nwctsobfF:ld")) != -1)
  71                 switch((char)ch) {
  72                 case 'n':
  73                         none++;
  74                         break;
  75                 case 'w':
  76                         eflags |= VIS_WHITE;
  77                         break;
  78                 case 'c':
  79                         eflags |= VIS_CSTYLE;
  80                         break;
  81                 case 't':
  82                         eflags |= VIS_TAB;
  83                         break;
  84                 case 's':
  85                         eflags |= VIS_SAFE;
  86                         break;
  87                 case 'o':
  88                         eflags |= VIS_OCTAL;
  89                         break;
  90                 case 'b':
  91                         eflags |= VIS_NOSLASH;
  92                         break;
  93                 case 'F':
  94                         if ((foldwidth = atoi(optarg))<5)
  95                                 errx(1, "can't fold lines to less than 5 cols");
  96                         /*FALLTHROUGH*/
  97                 case 'f':
  98                         fold++;         /* fold output lines to 80 cols */
  99                         break;          /* using hidden newline */
 100                 case 'l':
 101                         markeol++;      /* mark end of line with \$ */
 102                         break;
 103 #ifdef DEBUG
 104                 case 'd':
 105                         debug++;
 106                         break;
 107 #endif
 108                 case '?':
 109                 default:
 110                         usage();
 111                 }
 112         argc -= optind;
 113         argv += optind;
 114
 115         if (*argv)
 116                 while (*argv) {
 117                         if ((fp=fopen(*argv, "r")) != NULL)
 118                                 process(fp);
 119                         else
 120                                 warn("%s", *argv);
 121                         argv++;
 122                 }
 123         else
 124                 process(stdin);
 125         exit(0);
 126 }
 127
 128
 129 static void
 130 usage(void)
 131 {
 132 #ifdef DEBUG
 133         fprintf(stderr, "usage: vis [-cbflnostwd] [-F foldwidth] [file ...]\n");
 134 #else
 135         fprintf(stderr, "usage: vis [-cbflnostw] [-F foldwidth] [file ...]\n");
 136 #endif
 137         exit(1);
 138 }
 139
 140 void
 141 process(FILE *fp)
 142 {
 143         static int col = 0;
 144         static char dummy[] = "\0";
 145         char *cp = dummy+1; /* so *(cp-1) starts out != '\n' */
 146         int c, rachar;
 147         char buff[5];
 148
 149         c = getc(fp);
 150         while (c != EOF) {
 151                 rachar = getc(fp);
 152                 if (none) {
 153                         cp = buff;
 154                         *cp++ = c;
 155                         if (c == '\\')
 156                                 *cp++ = '\\';
 157                         *cp = '\0';
 158                 } else if (markeol && c == '\n') {
 159                         cp = buff;
 160                         if ((eflags & VIS_NOSLASH) == 0)
 161                                 *cp++ = '\\';
 162                         *cp++ = '$';
 163                         *cp++ = '\n';
 164                         *cp = '\0';
 165                 } else
 166                         (void) vis(buff, (char)c, eflags, (char)rachar);
 167
 168                 cp = buff;
 169                 if (fold) {
 170 #ifdef DEBUG
 171                         if (debug)
 172                                 printf("<%02d,", col);
 173 #endif
 174                         col = foldit(cp, col, foldwidth);
 175 #ifdef DEBUG
 176                         if (debug)
 177                                 printf("%02d>", col);
 178 #endif
 179                 }
 180                 do {
 181                         putchar(*cp);
 182                 } while (*++cp);
 183                 c = rachar;
 184         }
 185         /*
 186          * terminate partial line with a hidden newline
 187          */
 188         if (fold && *(cp-1) != '\n')
 189                 printf("\\\n");
 190 }