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  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)vis.c    8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/vis/vis.c,v 1.6 1999/08/28 01:07:25 peter Exp $
  36  * $DragonFly: src/usr.bin/vis/vis.c,v 1.3 2003/10/04 20:36:54 hmp Exp $
  37  */
  38
  39 #include <err.h>
  40 #include <locale.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <unistd.h>
  44 #include <vis.h>
  45
  46 int eflags, fold, foldwidth=80, none, markeol, debug;
  47
  48 void process(FILE *, char *filename);
  49 static void usage(void);
  50 extern int foldit(char *, int, int);
  51
  52 int
  53 main(int argc, char **argv)
  54 {
  55         FILE *fp;
  56         int ch;
  57
  58         (void) setlocale(LC_CTYPE, "");
  59
  60         while ((ch = getopt(argc, argv, "nwctsobfF:ld")) != -1)
  61                 switch((char)ch) {
  62                 case 'n':
  63                         none++;
  64                         break;
  65                 case 'w':
  66                         eflags |= VIS_WHITE;
  67                         break;
  68                 case 'c':
  69                         eflags |= VIS_CSTYLE;
  70                         break;
  71                 case 't':
  72                         eflags |= VIS_TAB;
  73                         break;
  74                 case 's':
  75                         eflags |= VIS_SAFE;
  76                         break;
  77                 case 'o':
  78                         eflags |= VIS_OCTAL;
  79                         break;
  80                 case 'b':
  81                         eflags |= VIS_NOSLASH;
  82                         break;
  83                 case 'F':
  84                         if ((foldwidth = atoi(optarg))<5)
  85                                 errx(1, "can't fold lines to less than 5 cols");
  86                         /*FALLTHROUGH*/
  87                 case 'f':
  88                         fold++;         /* fold output lines to 80 cols */
  89                         break;          /* using hidden newline */
  90                 case 'l':
  91                         markeol++;      /* mark end of line with \$ */
  92                         break;
  93 #ifdef DEBUG
  94                 case 'd':
  95                         debug++;
  96                         break;
  97 #endif
  98                 case '?':
  99                 default:
 100                         usage();
 101                 }
 102         argc -= optind;
 103         argv += optind;
 104
 105         if (*argv)
 106                 while (*argv) {
 107                         if ((fp=fopen(*argv, "r")) != NULL)
 108                                 process(fp, *argv);
 109                         else
 110                                 warn("%s", *argv);
 111                         argv++;
 112                 }
 113         else
 114                 process(stdin, "<stdin>");
 115         exit(0);
 116 }
 117
 118
 119 static void
 120 usage(void)
 121 {
 122 #ifdef DEBUG
 123         fprintf(stderr, "usage: vis [-cbflnostwd] [-F foldwidth] [file ...]\n");
 124 #else
 125         fprintf(stderr, "usage: vis [-cbflnostw] [-F foldwidth] [file ...]\n");
 126 #endif
 127         exit(1);
 128 }
 129
 130 void
 131 process(FILE *fp, char *filename)
 132 {
 133         static int col = 0;
 134         register char *cp = "\0"+1;     /* so *(cp-1) starts out != '\n' */
 135         register int c, rachar;
 136         char buff[5];
 137
 138         c = getc(fp);
 139         while (c != EOF) {
 140                 rachar = getc(fp);
 141                 if (none) {
 142                         cp = buff;
 143                         *cp++ = c;
 144                         if (c == '\\')
 145                                 *cp++ = '\\';
 146                         *cp = '\0';
 147                 } else if (markeol && c == '\n') {
 148                         cp = buff;
 149                         if ((eflags & VIS_NOSLASH) == 0)
 150                                 *cp++ = '\\';
 151                         *cp++ = '$';
 152                         *cp++ = '\n';
 153                         *cp = '\0';
 154                 } else
 155                         (void) vis(buff, (char)c, eflags, (char)rachar);
 156
 157                 cp = buff;
 158                 if (fold) {
 159 #ifdef DEBUG
 160                         if (debug)
 161                                 printf("<%02d,", col);
 162 #endif
 163                         col = foldit(cp, col, foldwidth);
 164 #ifdef DEBUG
 165                         if (debug)
 166                                 printf("%02d>", col);
 167 #endif
 168                 }
 169                 do {
 170                         putchar(*cp);
 171                 } while (*++cp);
 172                 c = rachar;
 173         }
 174         /*
 175          * terminate partial line with a hidden newline
 176          */
 177         if (fold && *(cp-1) != '\n')
 178                 printf("\\\n");
 179 }