usr.bin/colcrt/colcrt.c

   1 /*
   2  * Copyright (c) 1980, 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) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)colcrt.c 8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/colcrt/colcrt.c,v 1.5.2.4 2001/08/02 01:29:07 obrien Exp $
  32  * $DragonFly: src/usr.bin/colcrt/colcrt.c,v 1.5 2005/08/04 17:31:22 drhodus Exp $
  33  */
  34
  35 #include <err.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40 /*
  41  * colcrt - replaces col for crts with new nroff esp. when using tbl.
  42  * Bill Joy UCB July 14, 1977
  43  *
  44  * This filter uses a screen buffer, 267 half-lines by 132 columns.
  45  * It interprets the up and down sequences generated by the new
  46  * nroff when used with tbl and by \u \d and \r.
  47  * General overstriking doesn't work correctly.
  48  * Underlining is split onto multiple lines, etc.
  49  *
  50  * Option - suppresses all underlining.
  51  * Option -2 forces printing of all half lines.
  52  */
  53
  54 char    page[267][132];
  55
  56 int     outline = 1;
  57 int     outcol;
  58
  59 char    suppresul;
  60 char    printall;
  61
  62 FILE    *f;
  63
  64 int             main(int, char *[]);
  65 static void     move(int, int);
  66 static void     pflush(int);
  67 static int      plus(char, char);
  68 static void     usage(void);
  69
  70 int
  71 main(int argc, char **argv)
  72 {
  73         int c;
  74         char *cp, *dp;
  75         int ch;
  76
  77         while ((ch = getopt(argc, argv, "-2")) != -1)
  78                 switch (ch) {
  79                 case '-':
  80                         suppresul = 1;
  81                         break;
  82                 case '2':
  83                         printall = 1;
  84                         break;
  85                 default:
  86                         usage();
  87                 }
  88         argc -= optind;
  89         argv += optind;
  90
  91         do {
  92                 if (argc > 0) {
  93                         close(0);
  94                         if (!(f = fopen(argv[0], "r"))) {
  95                                 fflush(stdout);
  96                                 err(1, "%s", argv[0]);
  97                         }
  98                         argc--;
  99                         argv++;
 100                 }
 101                 for (;;) {
 102                         c = getc(stdin);
 103                         if (c == -1) {
 104                                 pflush(outline);
 105                                 fflush(stdout);
 106                                 break;
 107                         }
 108                         switch (c) {
 109                                 case '\n':
 110                                         if (outline >= 265)
 111                                                 pflush(62);
 112                                         outline += 2;
 113                                         outcol = 0;
 114                                         continue;
 115                                 case '\016':
 116                                         case '\017':
 117                                         continue;
 118                                 case 033:
 119                                         c = getc(stdin);
 120                                         switch (c) {
 121                                                 case '9':
 122                                                         if (outline >= 266)
 123                                                                 pflush(62);
 124                                                         outline++;
 125                                                         continue;
 126                                                 case '8':
 127                                                         if (outline >= 1)
 128                                                                 outline--;
 129                                                         continue;
 130                                                 case '7':
 131                                                         outline -= 2;
 132                                                         if (outline < 0)
 133                                                                 outline = 0;
 134                                                         continue;
 135                                                 default:
 136                                                         continue;
 137                                         }
 138                                 case '\b':
 139                                         if (outcol)
 140                                                 outcol--;
 141                                         continue;
 142                                 case '\t':
 143                                         outcol += 8;
 144                                         outcol &= ~7;
 145                                         outcol--;
 146                                         c = ' ';
 147                                 default:
 148                                         if (outcol >= 132) {
 149                                                 outcol++;
 150                                                 continue;
 151                                         }
 152                                         cp = &page[outline][outcol];
 153                                         outcol++;
 154                                         if (c == '_') {
 155                                                 if (suppresul)
 156                                                         continue;
 157                                                 cp += 132;
 158                                                 c = '-';
 159                                         }
 160                                         if (*cp == 0) {
 161                                                 *cp = c;
 162                                                 dp = cp - outcol;
 163                                                 for (cp--; cp >= dp && *cp == 0; cp--)
 164                                                         *cp = ' ';
 165                                         } else
 166                                                 if (plus(c, *cp) || plus(*cp, c))
 167                                                         *cp = '+';
 168                                                 else if (*cp == ' ' || *cp == 0)
 169                                                         *cp = c;
 170                                         continue;
 171                         }
 172                 }
 173         } while (argc > 0);
 174         fflush(stdout);
 175         exit(0);
 176 }
 177
 178 static void
 179 usage(void)
 180 {
 181         fprintf(stderr, "usage: colcrt [-] [-2] [file ...]\n");
 182         exit(1);
 183 }
 184
 185 static int
 186 plus(char c, char d)
 187 {
 188
 189         return ((c == '|' && d == '-') || d == '_');
 190 }
 191
 192 int first;
 193
 194 static void
 195 pflush(int ol)
 196 {
 197         int i;
 198         char *cp;
 199         char lastomit;
 200         int l;
 201
 202         l = ol;
 203         lastomit = 0;
 204         if (l > 266)
 205                 l = 266;
 206         else
 207                 l |= 1;
 208         for (i = first | 1; i < l; i++) {
 209                 move(i, i - 1);
 210                 move(i, i + 1);
 211         }
 212         for (i = first; i < l; i++) {
 213                 cp = page[i];
 214                 if (printall == 0 && lastomit == 0 && *cp == 0) {
 215                         lastomit = 1;
 216                         continue;
 217                 }
 218                 lastomit = 0;
 219                 printf("%s\n", cp);
 220         }
 221         bcopy(page[ol], page, (267 - ol) * 132);
 222         bzero(page[267- ol], ol * 132);
 223         outline -= ol;
 224         outcol = 0;
 225         first = 1;
 226 }
 227
 228 static void
 229 move(int l, int m)
 230 {
 231         char *cp, *dp;
 232
 233         for (cp = page[l], dp = page[m]; *cp; cp++, dp++) {
 234                 switch (*cp) {
 235                         case '|':
 236                                 if (*dp != ' ' && *dp != '|' && *dp != 0)
 237                                         return;
 238                                 break;
 239                         case ' ':
 240                                 break;
 241                         default:
 242                                 return;
 243                 }
 244         }
 245         if (*cp == 0) {
 246                 for (cp = page[l], dp = page[m]; *cp; cp++, dp++)
 247                         if (*cp == '|')
 248                                 *dp = '|';
 249                         else if (*dp == 0)
 250                                 *dp = ' ';
 251                 page[l][0] = 0;
 252         }
 253 }