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
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1980, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static const char sccsid[] = "@(#)colcrt.c      8.1 (Berkeley) 6/6/93";
  43 #endif
  44 static const char rcsid[] =
  45   "$FreeBSD: src/usr.bin/colcrt/colcrt.c,v 1.5.2.4 2001/08/02 01:29:07 obrien Exp $";
  46 #endif /* not lint */
  47
  48 #include <err.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 /*
  54  * colcrt - replaces col for crts with new nroff esp. when using tbl.
  55  * Bill Joy UCB July 14, 1977
  56  *
  57  * This filter uses a screen buffer, 267 half-lines by 132 columns.
  58  * It interprets the up and down sequences generated by the new
  59  * nroff when used with tbl and by \u \d and \r.
  60  * General overstriking doesn't work correctly.
  61  * Underlining is split onto multiple lines, etc.
  62  *
  63  * Option - suppresses all underlining.
  64  * Option -2 forces printing of all half lines.
  65  */
  66
  67 char    page[267][132];
  68
  69 int     outline = 1;
  70 int     outcol;
  71
  72 char    suppresul;
  73 char    printall;
  74
  75 FILE    *f;
  76
  77 int             main __P((int, char *[]));
  78 static void     move __P((int, int));
  79 static void     pflush __P((int));
  80 static int      plus __P((char, char));
  81 static void     usage __P((void));
  82
  83 int
  84 main(argc, argv)
  85         int argc;
  86         char *argv[];
  87 {
  88         int c;
  89         char *cp, *dp;
  90         int ch;
  91
  92         while ((ch = getopt(argc, argv, "-2")) != -1)
  93                 switch (ch) {
  94                 case '-':
  95                         suppresul = 1;
  96                         break;
  97                 case '2':
  98                         printall = 1;
  99                         break;
 100                 default:
 101                         usage();
 102                 }
 103         argc -= optind;
 104         argv += optind;
 105
 106         do {
 107                 if (argc > 0) {
 108                         close(0);
 109                         if (!(f = fopen(argv[0], "r"))) {
 110                                 fflush(stdout);
 111                                 err(1, "%s", argv[0]);
 112                         }
 113                         argc--;
 114                         argv++;
 115                 }
 116                 for (;;) {
 117                         c = getc(stdin);
 118                         if (c == -1) {
 119                                 pflush(outline);
 120                                 fflush(stdout);
 121                                 break;
 122                         }
 123                         switch (c) {
 124                                 case '\n':
 125                                         if (outline >= 265)
 126                                                 pflush(62);
 127                                         outline += 2;
 128                                         outcol = 0;
 129                                         continue;
 130                                 case '\016':
 131                                         case '\017':
 132                                         continue;
 133                                 case 033:
 134                                         c = getc(stdin);
 135                                         switch (c) {
 136                                                 case '9':
 137                                                         if (outline >= 266)
 138                                                                 pflush(62);
 139                                                         outline++;
 140                                                         continue;
 141                                                 case '8':
 142                                                         if (outline >= 1)
 143                                                                 outline--;
 144                                                         continue;
 145                                                 case '7':
 146                                                         outline -= 2;
 147                                                         if (outline < 0)
 148                                                                 outline = 0;
 149                                                         continue;
 150                                                 default:
 151                                                         continue;
 152                                         }
 153                                 case '\b':
 154                                         if (outcol)
 155                                                 outcol--;
 156                                         continue;
 157                                 case '\t':
 158                                         outcol += 8;
 159                                         outcol &= ~7;
 160                                         outcol--;
 161                                         c = ' ';
 162                                 default:
 163                                         if (outcol >= 132) {
 164                                                 outcol++;
 165                                                 continue;
 166                                         }
 167                                         cp = &page[outline][outcol];
 168                                         outcol++;
 169                                         if (c == '_') {
 170                                                 if (suppresul)
 171                                                         continue;
 172                                                 cp += 132;
 173                                                 c = '-';
 174                                         }
 175                                         if (*cp == 0) {
 176                                                 *cp = c;
 177                                                 dp = cp - outcol;
 178                                                 for (cp--; cp >= dp && *cp == 0; cp--)
 179                                                         *cp = ' ';
 180                                         } else
 181                                                 if (plus(c, *cp) || plus(*cp, c))
 182                                                         *cp = '+';
 183                                                 else if (*cp == ' ' || *cp == 0)
 184                                                         *cp = c;
 185                                         continue;
 186                         }
 187                 }
 188         } while (argc > 0);
 189         fflush(stdout);
 190         exit(0);
 191 }
 192
 193 static void
 194 usage()
 195 {
 196         fprintf(stderr, "usage: colcrt [-] [-2] [file ...]\n");
 197         exit(1);
 198 }
 199
 200 static int
 201 plus(c, d)
 202         char c, d;
 203 {
 204
 205         return ((c == '|' && d == '-') || d == '_');
 206 }
 207
 208 int first;
 209
 210 static void
 211 pflush(ol)
 212         int ol;
 213 {
 214         register int i;
 215         register char *cp;
 216         char lastomit;
 217         int l;
 218
 219         l = ol;
 220         lastomit = 0;
 221         if (l > 266)
 222                 l = 266;
 223         else
 224                 l |= 1;
 225         for (i = first | 1; i < l; i++) {
 226                 move(i, i - 1);
 227                 move(i, i + 1);
 228         }
 229         for (i = first; i < l; i++) {
 230                 cp = page[i];
 231                 if (printall == 0 && lastomit == 0 && *cp == 0) {
 232                         lastomit = 1;
 233                         continue;
 234                 }
 235                 lastomit = 0;
 236                 printf("%s\n", cp);
 237         }
 238         bcopy(page[ol], page, (267 - ol) * 132);
 239         bzero(page[267- ol], ol * 132);
 240         outline -= ol;
 241         outcol = 0;
 242         first = 1;
 243 }
 244
 245 static void
 246 move(l, m)
 247         int l, m;
 248 {
 249         register char *cp, *dp;
 250
 251         for (cp = page[l], dp = page[m]; *cp; cp++, dp++) {
 252                 switch (*cp) {
 253                         case '|':
 254                                 if (*dp != ' ' && *dp != '|' && *dp != 0)
 255                                         return;
 256                                 break;
 257                         case ' ':
 258                                 break;
 259                         default:
 260                                 return;
 261                 }
 262         }
 263         if (*cp == 0) {
 264                 for (cp = page[l], dp = page[m]; *cp; cp++, dp++)
 265                         if (*cp == '|')
 266                                 *dp = '|';
 267                         else if (*dp == 0)
 268                                 *dp = ' ';
 269                 page[l][0] = 0;
 270         }
 271 }