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  * 4. 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
  30 #ifndef lint
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1980, 1993\n\
  33         The Regents of the University of California.  All rights reserved.\n";
  34 #endif
  35
  36 #if 0
  37 #ifndef lint
  38 static char sccsid[] = "@(#)colcrt.c    8.1 (Berkeley) 6/6/93";
  39 #endif
  40 #endif
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <err.h>
  46 #include <locale.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51 #include <wchar.h>
  52
  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 wchar_t page[267][132];
  68
  69 int     outline = 1;
  70 int     outcol;
  71
  72 char    suppresul;
  73 char    printall;
  74
  75 static void     move(int, int);
  76 static void     pflush(int);
  77 static int      plus(wchar_t, wchar_t);
  78 static void     usage(void);
  79
  80 int
  81 main(int argc, char *argv[])
  82 {
  83         wint_t c;
  84         wchar_t *cp, *dp;
  85         int ch, i, w;
  86
  87         setlocale(LC_ALL, "");
  88
  89         while ((ch = getopt(argc, argv, "-2")) != -1)
  90                 switch (ch) {
  91                 case '-':
  92                         suppresul = 1;
  93                         break;
  94                 case '2':
  95                         printall = 1;
  96                         break;
  97                 default:
  98                         usage();
  99                 }
 100         argc -= optind;
 101         argv += optind;
 102
 103         do {
 104                 if (argc > 0) {
 105                         if (freopen(argv[0], "r", stdin) == NULL) {
 106                                 fflush(stdout);
 107                                 err(1, "%s", argv[0]);
 108                         }
 109                         argc--;
 110                         argv++;
 111                 }
 112                 for (;;) {
 113                         c = getwc(stdin);
 114                         if (c == WEOF) {
 115                                 pflush(outline);
 116                                 fflush(stdout);
 117                                 break;
 118                         }
 119                         switch (c) {
 120                         case '\n':
 121                                 if (outline >= 265)
 122                                         pflush(62);
 123                                 outline += 2;
 124                                 outcol = 0;
 125                                 continue;
 126                         case '\016':
 127                         case '\017':
 128                                 continue;
 129                         case 033:
 130                                 c = getwc(stdin);
 131                                 switch (c) {
 132                                 case '9':
 133                                         if (outline >= 266)
 134                                                 pflush(62);
 135                                         outline++;
 136                                         continue;
 137                                 case '8':
 138                                         if (outline >= 1)
 139                                                 outline--;
 140                                         continue;
 141                                 case '7':
 142                                         outline -= 2;
 143                                         if (outline < 0)
 144                                                 outline = 0;
 145                                         continue;
 146                                 default:
 147                                         continue;
 148                                 }
 149                         case '\b':
 150                                 if (outcol)
 151                                         outcol--;
 152                                 continue;
 153                         case '\t':
 154                                 outcol += 8;
 155                                 outcol &= ~7;
 156                                 outcol--;
 157                                 c = ' ';
 158                         default:
 159                                 if ((w = wcwidth(c)) <= 0)
 160                                         w = 1;  /* XXX */
 161                                 if (outcol + w > 132) {
 162                                         outcol += w;
 163                                         continue;
 164                                 }
 165                                 cp = &page[outline][outcol];
 166                                 outcol += w;
 167                                 if (c == '_') {
 168                                         if (suppresul)
 169                                                 continue;
 170                                         cp += 132;
 171                                         c = '-';
 172                                 }
 173                                 if (*cp == 0) {
 174                                         for (i = 0; i < w; i++)
 175                                                 cp[i] = c;
 176                                         dp = cp - (outcol - w);
 177                                         for (cp--; cp >= dp && *cp == 0; cp--)
 178                                                 *cp = ' ';
 179                                 } else {
 180                                         if (plus(c, *cp) || plus(*cp, c))
 181                                                 *cp = '+';
 182                                         else if (*cp == ' ' || *cp == 0) {
 183                                                 for (i = 1; i < w; i++)
 184                                                         if (cp[i] != ' ' &&
 185                                                             cp[i] != 0)
 186                                                                 goto cont;
 187                                                 for (i = 0; i < w; i++)
 188                                                         cp[i] = c;
 189                                         }
 190                                 }
 191 cont:
 192                                 continue;
 193                         }
 194                 }
 195                 if (ferror(stdin))
 196                         err(1, NULL);
 197         } while (argc > 0);
 198         fflush(stdout);
 199         exit(0);
 200 }
 201
 202 static void
 203 usage(void)
 204 {
 205         fprintf(stderr, "usage: colcrt [-] [-2] [file ...]\n");
 206         exit(1);
 207 }
 208
 209 static int
 210 plus(wchar_t c, wchar_t d)
 211 {
 212
 213         return ((c == '|' && d == '-') || d == '_');
 214 }
 215
 216 static void
 217 pflush(int ol)
 218 {
 219         static int first;
 220         int i;
 221         wchar_t *cp;
 222         char lastomit;
 223         int l, w;
 224
 225         l = ol;
 226         lastomit = 0;
 227         if (l > 266)
 228                 l = 266;
 229         else
 230                 l |= 1;
 231         for (i = first | 1; i < l; i++) {
 232                 move(i, i - 1);
 233                 move(i, i + 1);
 234         }
 235         for (i = first; i < l; i++) {
 236                 cp = page[i];
 237                 if (printall == 0 && lastomit == 0 && *cp == 0) {
 238                         lastomit = 1;
 239                         continue;
 240                 }
 241                 lastomit = 0;
 242                 while (*cp != L'\0') {
 243                         if ((w = wcwidth(*cp)) > 0) {
 244                                 putwchar(*cp);
 245                                 cp += w;
 246                         } else
 247                                 cp++;
 248                 }
 249                 putwchar(L'\n');
 250         }
 251         wmemcpy(page[0], page[ol], (267 - ol) * 132);
 252         wmemset(page[267- ol], L'\0', ol * 132);
 253         outline -= ol;
 254         outcol = 0;
 255         first = 1;
 256 }
 257
 258 static void
 259 move(int l, int m)
 260 {
 261         wchar_t *cp, *dp;
 262
 263         for (cp = page[l], dp = page[m]; *cp; cp++, dp++) {
 264                 switch (*cp) {
 265                         case '|':
 266                                 if (*dp != ' ' && *dp != '|' && *dp != 0)
 267                                         return;
 268                                 break;
 269                         case ' ':
 270                                 break;
 271                         default:
 272                                 return;
 273                 }
 274         }
 275         if (*cp == 0) {
 276                 for (cp = page[l], dp = page[m]; *cp; cp++, dp++)
 277                         if (*cp == '|')
 278                                 *dp = '|';
 279                         else if (*dp == 0)
 280                                 *dp = ' ';
 281                 page[l][0] = 0;
 282         }
 283 }