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. 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) 1980, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)colcrt.c 8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/colcrt/colcrt.c,v 1.5.2.4 2001/08/02 01:29:07 obrien Exp $
  36  * $DragonFly: src/usr.bin/colcrt/colcrt.c,v 1.2 2003/06/17 04:29:25 dillon Exp $
  37  */
  38
  39 #include <err.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <unistd.h>
  44 /*
  45  * colcrt - replaces col for crts with new nroff esp. when using tbl.
  46  * Bill Joy UCB July 14, 1977
  47  *
  48  * This filter uses a screen buffer, 267 half-lines by 132 columns.
  49  * It interprets the up and down sequences generated by the new
  50  * nroff when used with tbl and by \u \d and \r.
  51  * General overstriking doesn't work correctly.
  52  * Underlining is split onto multiple lines, etc.
  53  *
  54  * Option - suppresses all underlining.
  55  * Option -2 forces printing of all half lines.
  56  */
  57
  58 char    page[267][132];
  59
  60 int     outline = 1;
  61 int     outcol;
  62
  63 char    suppresul;
  64 char    printall;
  65
  66 FILE    *f;
  67
  68 int             main __P((int, char *[]));
  69 static void     move __P((int, int));
  70 static void     pflush __P((int));
  71 static int      plus __P((char, char));
  72 static void     usage __P((void));
  73
  74 int
  75 main(argc, argv)
  76         int argc;
  77         char *argv[];
  78 {
  79         int c;
  80         char *cp, *dp;
  81         int ch;
  82
  83         while ((ch = getopt(argc, argv, "-2")) != -1)
  84                 switch (ch) {
  85                 case '-':
  86                         suppresul = 1;
  87                         break;
  88                 case '2':
  89                         printall = 1;
  90                         break;
  91                 default:
  92                         usage();
  93                 }
  94         argc -= optind;
  95         argv += optind;
  96
  97         do {
  98                 if (argc > 0) {
  99                         close(0);
 100                         if (!(f = fopen(argv[0], "r"))) {
 101                                 fflush(stdout);
 102                                 err(1, "%s", argv[0]);
 103                         }
 104                         argc--;
 105                         argv++;
 106                 }
 107                 for (;;) {
 108                         c = getc(stdin);
 109                         if (c == -1) {
 110                                 pflush(outline);
 111                                 fflush(stdout);
 112                                 break;
 113                         }
 114                         switch (c) {
 115                                 case '\n':
 116                                         if (outline >= 265)
 117                                                 pflush(62);
 118                                         outline += 2;
 119                                         outcol = 0;
 120                                         continue;
 121                                 case '\016':
 122                                         case '\017':
 123                                         continue;
 124                                 case 033:
 125                                         c = getc(stdin);
 126                                         switch (c) {
 127                                                 case '9':
 128                                                         if (outline >= 266)
 129                                                                 pflush(62);
 130                                                         outline++;
 131                                                         continue;
 132                                                 case '8':
 133                                                         if (outline >= 1)
 134                                                                 outline--;
 135                                                         continue;
 136                                                 case '7':
 137                                                         outline -= 2;
 138                                                         if (outline < 0)
 139                                                                 outline = 0;
 140                                                         continue;
 141                                                 default:
 142                                                         continue;
 143                                         }
 144                                 case '\b':
 145                                         if (outcol)
 146                                                 outcol--;
 147                                         continue;
 148                                 case '\t':
 149                                         outcol += 8;
 150                                         outcol &= ~7;
 151                                         outcol--;
 152                                         c = ' ';
 153                                 default:
 154                                         if (outcol >= 132) {
 155                                                 outcol++;
 156                                                 continue;
 157                                         }
 158                                         cp = &page[outline][outcol];
 159                                         outcol++;
 160                                         if (c == '_') {
 161                                                 if (suppresul)
 162                                                         continue;
 163                                                 cp += 132;
 164                                                 c = '-';
 165                                         }
 166                                         if (*cp == 0) {
 167                                                 *cp = c;
 168                                                 dp = cp - outcol;
 169                                                 for (cp--; cp >= dp && *cp == 0; cp--)
 170                                                         *cp = ' ';
 171                                         } else
 172                                                 if (plus(c, *cp) || plus(*cp, c))
 173                                                         *cp = '+';
 174                                                 else if (*cp == ' ' || *cp == 0)
 175                                                         *cp = c;
 176                                         continue;
 177                         }
 178                 }
 179         } while (argc > 0);
 180         fflush(stdout);
 181         exit(0);
 182 }
 183
 184 static void
 185 usage()
 186 {
 187         fprintf(stderr, "usage: colcrt [-] [-2] [file ...]\n");
 188         exit(1);
 189 }
 190
 191 static int
 192 plus(c, d)
 193         char c, d;
 194 {
 195
 196         return ((c == '|' && d == '-') || d == '_');
 197 }
 198
 199 int first;
 200
 201 static void
 202 pflush(ol)
 203         int ol;
 204 {
 205         register int i;
 206         register char *cp;
 207         char lastomit;
 208         int l;
 209
 210         l = ol;
 211         lastomit = 0;
 212         if (l > 266)
 213                 l = 266;
 214         else
 215                 l |= 1;
 216         for (i = first | 1; i < l; i++) {
 217                 move(i, i - 1);
 218                 move(i, i + 1);
 219         }
 220         for (i = first; i < l; i++) {
 221                 cp = page[i];
 222                 if (printall == 0 && lastomit == 0 && *cp == 0) {
 223                         lastomit = 1;
 224                         continue;
 225                 }
 226                 lastomit = 0;
 227                 printf("%s\n", cp);
 228         }
 229         bcopy(page[ol], page, (267 - ol) * 132);
 230         bzero(page[267- ol], ol * 132);
 231         outline -= ol;
 232         outcol = 0;
 233         first = 1;
 234 }
 235
 236 static void
 237 move(l, m)
 238         int l, m;
 239 {
 240         register char *cp, *dp;
 241
 242         for (cp = page[l], dp = page[m]; *cp; cp++, dp++) {
 243                 switch (*cp) {
 244                         case '|':
 245                                 if (*dp != ' ' && *dp != '|' && *dp != 0)
 246                                         return;
 247                                 break;
 248                         case ' ':
 249                                 break;
 250                         default:
 251                                 return;
 252                 }
 253         }
 254         if (*cp == 0) {
 255                 for (cp = page[l], dp = page[m]; *cp; cp++, dp++)
 256                         if (*cp == '|')
 257                                 *dp = '|';
 258                         else if (*dp == 0)
 259                                 *dp = ' ';
 260                 page[l][0] = 0;
 261         }
 262 }