text_cmds/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: src/usr.bin/vis/vis.c,v 1.10 2002/09/04 23:29:09 dwmalone Exp $");
  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 #include <sysexits.h>
  55
  56 #include "extern.h"
  57
  58 int eflags, fold, foldwidth=80, none, markeol, debug;
  59
  60 void process(FILE *);
  61 static void usage(void);
  62
  63 int
  64 main(int argc, char *argv[])
  65 {
  66         FILE *fp;
  67         int ch;
  68
  69         (void) setlocale(LC_CTYPE, "");
  70
  71         while ((ch = getopt(argc, argv, "nwctsobfF:ld")) != -1)
  72                 switch((char)ch) {
  73                 case 'n':
  74                         none++;
  75                         break;
  76                 case 'w':
  77                         eflags |= VIS_WHITE;
  78                         break;
  79                 case 'c':
  80                         eflags |= VIS_CSTYLE;
  81                         break;
  82                 case 't':
  83                         eflags |= VIS_TAB;
  84                         break;
  85                 case 's':
  86                         eflags |= VIS_SAFE;
  87                         break;
  88                 case 'o':
  89                         eflags |= VIS_OCTAL;
  90                         break;
  91                 case 'b':
  92                         eflags |= VIS_NOSLASH;
  93                         break;
  94                 case 'F':
  95                         if ((foldwidth = atoi(optarg))<5)
  96                                 errx(1, "can't fold lines to less than 5 cols");
  97                         /*FALLTHROUGH*/
  98                 case 'f':
  99                         fold++;         /* fold output lines to 80 cols */
 100                         break;          /* using hidden newline */
 101                 case 'l':
 102                         markeol++;      /* mark end of line with \$ */
 103                         break;
 104 #ifdef DEBUG
 105                 case 'd':
 106                         debug++;
 107                         break;
 108 #endif
 109                 case '?':
 110                 default:
 111                         usage();
 112                 }
 113         argc -= optind;
 114         argv += optind;
 115
 116         if (*argv)
 117                 while (*argv) {
 118                         if ((fp=fopen(*argv, "r")) != NULL)
 119                                 process(fp);
 120                         else
 121                                 warn("%s", *argv);
 122                         argv++;
 123                 }
 124         else
 125                 process(stdin);
 126         exit(0);
 127 }
 128
 129
 130 static void
 131 usage(void)
 132 {
 133 #ifdef DEBUG
 134         fprintf(stderr, "usage: vis [-cbflnostwd] [-F foldwidth] [file ...]\n");
 135 #else
 136         fprintf(stderr, "usage: vis [-cbflnostw] [-F foldwidth] [file ...]\n");
 137 #endif
 138         exit(1);
 139 }
 140
 141 void
 142 process(FILE *fp)
 143 {
 144         static int col = 0;
 145         static char dummy[] = "\0";
 146         char *cp = dummy+1; /* so *(cp-1) starts out != '\n' */
 147         int c, rachar;
 148         char buff[5];
 149
 150         c = getc(fp);
 151         while (c != EOF) {
 152                 rachar = getc(fp);
 153                 if (none) {
 154                         cp = buff;
 155                         *cp++ = c;
 156                         if (c == '\\')
 157                                 *cp++ = '\\';
 158                         *cp = '\0';
 159                 } else if (markeol && c == '\n') {
 160                         cp = buff;
 161                         if ((eflags & VIS_NOSLASH) == 0)
 162                                 *cp++ = '\\';
 163                         *cp++ = '$';
 164                         *cp++ = '\n';
 165                         *cp = '\0';
 166                 } else
 167                         (void) vis(buff, (char)c, eflags, (char)rachar);
 168
 169                 cp = buff;
 170                 if (fold) {
 171 #ifdef DEBUG
 172                         if (debug)
 173                                 printf("<%02d,", col);
 174 #endif
 175                         col = foldit(cp, col, foldwidth);
 176 #ifdef DEBUG
 177                         if (debug)
 178                                 printf("%02d>", col);
 179 #endif
 180                 }
 181                 do {
 182                         putchar(*cp);
 183                 } while (*++cp);
 184                 c = rachar;
 185         }
 186         /*
 187          * terminate partial line with a hidden newline
 188          */
 189         if (fold && *(cp-1) != '\n')
 190                 printf("\\\n");
 191
 192         if (ferror(fp))
 193                 errx(EX_IOERR, NULL);
 194 }