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 1.5 2005/08/04 17:31:22 drhodus 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(int, char *[]);
  69 static void     move(int, int);
  70 static void     pflush(int);
  71 static int      plus(char, char);
  72 static void     usage(void);
  73
  74 int
  75 main(int argc, char **argv)
  76 {
  77         int c;
  78         char *cp, *dp;
  79         int ch;
  80
  81         while ((ch = getopt(argc, argv, "-2")) != -1)
  82                 switch (ch) {
  83                 case '-':
  84                         suppresul = 1;
  85                         break;
  86                 case '2':
  87                         printall = 1;
  88                         break;
  89                 default:
  90                         usage();
  91                 }
  92         argc -= optind;
  93         argv += optind;
  94
  95         do {
  96                 if (argc > 0) {
  97                         close(0);
  98                         if (!(f = fopen(argv[0], "r"))) {
  99                                 fflush(stdout);
 100                                 err(1, "%s", argv[0]);
 101                         }
 102                         argc--;
 103                         argv++;
 104                 }
 105                 for (;;) {
 106                         c = getc(stdin);
 107                         if (c == -1) {
 108                                 pflush(outline);
 109                                 fflush(stdout);
 110                                 break;
 111                         }
 112                         switch (c) {
 113                                 case '\n':
 114                                         if (outline >= 265)
 115                                                 pflush(62);
 116                                         outline += 2;
 117                                         outcol = 0;
 118                                         continue;
 119                                 case '\016':
 120                                         case '\017':
 121                                         continue;
 122                                 case 033:
 123                                         c = getc(stdin);
 124                                         switch (c) {
 125                                                 case '9':
 126                                                         if (outline >= 266)
 127                                                                 pflush(62);
 128                                                         outline++;
 129                                                         continue;
 130                                                 case '8':
 131                                                         if (outline >= 1)
 132                                                                 outline--;
 133                                                         continue;
 134                                                 case '7':
 135                                                         outline -= 2;
 136                                                         if (outline < 0)
 137                                                                 outline = 0;
 138                                                         continue;
 139                                                 default:
 140                                                         continue;
 141                                         }
 142                                 case '\b':
 143                                         if (outcol)
 144                                                 outcol--;
 145                                         continue;
 146                                 case '\t':
 147                                         outcol += 8;
 148                                         outcol &= ~7;
 149                                         outcol--;
 150                                         c = ' ';
 151                                 default:
 152                                         if (outcol >= 132) {
 153                                                 outcol++;
 154                                                 continue;
 155                                         }
 156                                         cp = &page[outline][outcol];
 157                                         outcol++;
 158                                         if (c == '_') {
 159                                                 if (suppresul)
 160                                                         continue;
 161                                                 cp += 132;
 162                                                 c = '-';
 163                                         }
 164                                         if (*cp == 0) {
 165                                                 *cp = c;
 166                                                 dp = cp - outcol;
 167                                                 for (cp--; cp >= dp && *cp == 0; cp--)
 168                                                         *cp = ' ';
 169                                         } else
 170                                                 if (plus(c, *cp) || plus(*cp, c))
 171                                                         *cp = '+';
 172                                                 else if (*cp == ' ' || *cp == 0)
 173                                                         *cp = c;
 174                                         continue;
 175                         }
 176                 }
 177         } while (argc > 0);
 178         fflush(stdout);
 179         exit(0);
 180 }
 181
 182 static void
 183 usage(void)
 184 {
 185         fprintf(stderr, "usage: colcrt [-] [-2] [file ...]\n");
 186         exit(1);
 187 }
 188
 189 static int
 190 plus(char c, char d)
 191 {
 192
 193         return ((c == '|' && d == '-') || d == '_');
 194 }
 195
 196 int first;
 197
 198 static void
 199 pflush(int ol)
 200 {
 201         int i;
 202         char *cp;
 203         char lastomit;
 204         int l;
 205
 206         l = ol;
 207         lastomit = 0;
 208         if (l > 266)
 209                 l = 266;
 210         else
 211                 l |= 1;
 212         for (i = first | 1; i < l; i++) {
 213                 move(i, i - 1);
 214                 move(i, i + 1);
 215         }
 216         for (i = first; i < l; i++) {
 217                 cp = page[i];
 218                 if (printall == 0 && lastomit == 0 && *cp == 0) {
 219                         lastomit = 1;
 220                         continue;
 221                 }
 222                 lastomit = 0;
 223                 printf("%s\n", cp);
 224         }
 225         bcopy(page[ol], page, (267 - ol) * 132);
 226         bzero(page[267- ol], ol * 132);
 227         outline -= ol;
 228         outcol = 0;
 229         first = 1;
 230 }
 231
 232 static void
 233 move(int l, int m)
 234 {
 235         char *cp, *dp;
 236
 237         for (cp = page[l], dp = page[m]; *cp; cp++, dp++) {
 238                 switch (*cp) {
 239                         case '|':
 240                                 if (*dp != ' ' && *dp != '|' && *dp != 0)
 241                                         return;
 242                                 break;
 243                         case ' ':
 244                                 break;
 245                         default:
 246                                 return;
 247                 }
 248         }
 249         if (*cp == 0) {
 250                 for (cp = page[l], dp = page[m]; *cp; cp++, dp++)
 251                         if (*cp == '|')
 252                                 *dp = '|';
 253                         else if (*dp == 0)
 254                                 *dp = ' ';
 255                 page[l][0] = 0;
 256         }
 257 }