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: head/usr.bin/colcrt/colcrt.c 227158 2011-11-06 08:14:28Z ed $
  32  */
  33
  34 #include <err.h>
  35 #include <locale.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40 #include <wchar.h>
  41
  42 /*
  43  * colcrt - replaces col for crts with new nroff esp. when using tbl.
  44  * Bill Joy UCB July 14, 1977
  45  *
  46  * This filter uses a screen buffer, 267 half-lines by 132 columns.
  47  * It interprets the up and down sequences generated by the new
  48  * nroff when used with tbl and by \u \d and \r.
  49  * General overstriking doesn't work correctly.
  50  * Underlining is split onto multiple lines, etc.
  51  *
  52  * Option - suppresses all underlining.
  53  * Option -2 forces printing of all half lines.
  54  */
  55
  56 static wchar_t  page[267][132];
  57
  58 static int      outline = 1;
  59 static int      outcol;
  60
  61 static char     suppresul;
  62 static char     printall;
  63
  64 static void     move(int, int);
  65 static void     pflush(int);
  66 static int      plus(wchar_t, wchar_t);
  67 static void     usage(void);
  68
  69 int
  70 main(int argc, char *argv[])
  71 {
  72         wint_t c;
  73         wchar_t *cp, *dp;
  74         int ch, i, w;
  75
  76         setlocale(LC_ALL, "");
  77
  78         while ((ch = getopt(argc, argv, "-2")) != -1)
  79                 switch (ch) {
  80                 case '-':
  81                         suppresul = 1;
  82                         break;
  83                 case '2':
  84                         printall = 1;
  85                         break;
  86                 default:
  87                         usage();
  88                 }
  89         argc -= optind;
  90         argv += optind;
  91
  92         do {
  93                 if (argc > 0) {
  94                         if (freopen(argv[0], "r", stdin) == NULL) {
  95                                 fflush(stdout);
  96                                 err(1, "%s", argv[0]);
  97                         }
  98                         argc--;
  99                         argv++;
 100                 }
 101                 for (;;) {
 102                         c = getwc(stdin);
 103                         if (c == WEOF) {
 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 = getwc(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                                 /* FALLTHROUGH */
 148                         default:
 149                                 if ((w = wcwidth(c)) <= 0)
 150                                         w = 1;  /* XXX */
 151                                 if (outcol + w > 132) {
 152                                         outcol += w;
 153                                         continue;
 154                                 }
 155                                 cp = &page[outline][outcol];
 156                                 outcol += w;
 157                                 if (c == '_') {
 158                                         if (suppresul)
 159                                                 continue;
 160                                         cp += 132;
 161                                         c = '-';
 162                                 }
 163                                 if (*cp == 0) {
 164                                         for (i = 0; i < w; i++)
 165                                                 cp[i] = c;
 166                                         dp = cp - (outcol - w);
 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                                                 for (i = 1; i < w; i++)
 174                                                         if (cp[i] != ' ' &&
 175                                                             cp[i] != 0)
 176                                                                 goto cont;
 177                                                 for (i = 0; i < w; i++)
 178                                                         cp[i] = c;
 179                                         }
 180                                 }
 181 cont:
 182                                 continue;
 183                         }
 184                 }
 185                 if (ferror(stdin))
 186                         err(1, NULL);
 187         } while (argc > 0);
 188         fflush(stdout);
 189         exit(0);
 190 }
 191
 192 static void
 193 usage(void)
 194 {
 195         fprintf(stderr, "usage: colcrt [-] [-2] [file ...]\n");
 196         exit(1);
 197 }
 198
 199 static int
 200 plus(wchar_t c, wchar_t d)
 201 {
 202
 203         return ((c == '|' && d == '-') || d == '_');
 204 }
 205
 206 static void
 207 pflush(int ol)
 208 {
 209         static int first;
 210         int i;
 211         wchar_t *cp;
 212         char lastomit;
 213         int l, w;
 214
 215         l = ol;
 216         lastomit = 0;
 217         if (l > 266)
 218                 l = 266;
 219         else
 220                 l |= 1;
 221         for (i = first | 1; i < l; i++) {
 222                 move(i, i - 1);
 223                 move(i, i + 1);
 224         }
 225         for (i = first; i < l; i++) {
 226                 cp = page[i];
 227                 if (printall == 0 && lastomit == 0 && *cp == 0) {
 228                         lastomit = 1;
 229                         continue;
 230                 }
 231                 lastomit = 0;
 232                 while (*cp != L'\0') {
 233                         if ((w = wcwidth(*cp)) > 0) {
 234                                 putwchar(*cp);
 235                                 cp += w;
 236                         } else
 237                                 cp++;
 238                 }
 239                 putwchar(L'\n');
 240         }
 241         wmemcpy(page[0], page[ol], (267 - ol) * 132);
 242         wmemset(page[267- ol], L'\0', ol * 132);
 243         outline -= ol;
 244         outcol = 0;
 245         first = 1;
 246 }
 247
 248 static void
 249 move(int l, int m)
 250 {
 251         wchar_t *cp, *dp;
 252
 253         for (cp = page[l], dp = page[m]; *cp; cp++, dp++) {
 254                 switch (*cp) {
 255                         case '|':
 256                                 if (*dp != ' ' && *dp != '|' && *dp != 0)
 257                                         return;
 258                                 break;
 259                         case ' ':
 260                                 break;
 261                         default:
 262                                 return;
 263                 }
 264         }
 265         if (*cp == 0) {
 266                 for (cp = page[l], dp = page[m]; *cp; cp++, dp++)
 267                         if (*cp == '|')
 268                                 *dp = '|';
 269                         else if (*dp == 0)
 270                                 *dp = ' ';
 271                 page[l][0] = 0;
 272         }
 273 }