window/wwwrite.c

   1 /*      $NetBSD: wwwrite.c,v 1.6 1997/11/21 08:38:00 lukem Exp $        */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Edward Wang at The University of California, Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)wwwrite.c   8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: wwwrite.c,v 1.6 1997/11/21 08:38:00 lukem Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include "ww.h"
  49 #include "tt.h"
  50 #include "xx.h"
  51 #include "char.h"
  52
  53 #define UPDATE() \
  54         if (!ISSET(w->ww_wflags, WWW_NOUPDATE) && w->ww_cur.r >= 0 && \
  55             w->ww_cur.r < wwnrow && wwtouched[w->ww_cur.r]) \
  56                 wwupdate1(w->ww_cur.r, w->ww_cur.r + 1)
  57
  58 /*
  59  * To support control character expansion, we save the old
  60  * p and q values in r and s, and point p at the beginning
  61  * of the expanded string, and q at some safe place beyond it
  62  * (p + 10).  At strategic points in the loops, we check
  63  * for (r && !*p) and restore the saved values back into
  64  * p and q.  Essentially, we implement a stack of depth 2,
  65  * to avoid recursion, which might be a better idea.
  66  */
  67 int
  68 wwwrite(w, p, n)
  69         struct ww *w;
  70         char *p;
  71         int n;
  72 {
  73         int hascursor;
  74         char *savep = p;
  75         char *q = p + n;
  76         char *r = 0;
  77         char *s = 0;
  78
  79 #ifdef lint
  80         s = 0;                  /* define it before possible use */
  81 #endif
  82         hascursor = ISSET(w->ww_wflags, WWW_HASCURSOR);
  83         if (hascursor)
  84                 wwcursor(w, 0);
  85         while (p < q && !ISSET(w->ww_pflags, WWP_STOPPED) &&
  86             (!wwinterrupt() || ISSET(w->ww_wflags, WWW_NOINTR))) {
  87                 if (r && !*p) {
  88                         p = r;
  89                         q = s;
  90                         r = 0;
  91                         continue;
  92                 }
  93                 if (w->ww_wstate == 0 &&
  94                     (isprt(*p) ||
  95                     (ISSET(w->ww_wflags, WWW_UNCTRL) && isunctrl(*p)))) {
  96                         int i;
  97                         union ww_char *bp;
  98                         int col, col1;
  99
 100                         if (ISSET(w->ww_wflags, WWW_INSERT)) {
 101                                 /* this is very slow */
 102                                 if (*p == '\t') {
 103                                         p++;
 104                                         w->ww_cur.c += 8 -
 105                                                 ((w->ww_cur.c - w->ww_w.l) & 7);
 106                                         goto chklf;
 107                                 }
 108                                 if (!isprt(*p)) {
 109                                         r = p + 1;
 110                                         s = q;
 111                                         p = unctrl(*p);
 112                                         q = p + 10;
 113                                 }
 114                                 wwinschar(w, w->ww_cur.r, w->ww_cur.c,
 115                                         *p++, w->ww_modes);
 116                                 goto right;
 117                         }
 118
 119                         bp = &w->ww_buf[w->ww_cur.r][w->ww_cur.c];
 120                         i = w->ww_cur.c;
 121                         while (i < w->ww_w.r && p < q)
 122                                 if (!*p && r) {
 123                                         p = r;
 124                                         q = s;
 125                                         r = 0;
 126                                 } else if (*p == '\t') {
 127                                         int tmp = 8 - ((i - w->ww_w.l) & 7);
 128                                         p++;
 129                                         i += tmp;
 130                                         bp += tmp;
 131                                 } else if (isprt(*p)) {
 132                                         bp++->c_w = *p++
 133                                                 | w->ww_modes << WWC_MSHIFT;
 134                                         i++;
 135                                 } else if (ISSET(w->ww_wflags, WWW_UNCTRL) &&
 136                                            isunctrl(*p)) {
 137                                         r = p + 1;
 138                                         s = q;
 139                                         p = unctrl(*p);
 140                                         q = p + 10;
 141                                 } else
 142                                         break;
 143                         col = MAX(w->ww_cur.c, w->ww_i.l);
 144                         col1 = MIN(i, w->ww_i.r);
 145                         w->ww_cur.c = i;
 146                         if (w->ww_cur.r >= w->ww_i.t
 147                             && w->ww_cur.r < w->ww_i.b) {
 148                                 union ww_char *ns = wwns[w->ww_cur.r];
 149                                 unsigned char *smap =
 150                                     &wwsmap[w->ww_cur.r][col];
 151                                 char *win = w->ww_win[w->ww_cur.r];
 152                                 int nchanged = 0;
 153
 154                                 bp = w->ww_buf[w->ww_cur.r];
 155                                 for (i = col; i < col1; i++)
 156                                         if (*smap++ == w->ww_index) {
 157                                                 nchanged++;
 158                                                 ns[i].c_w = bp[i].c_w
 159                                                         ^ win[i] << WWC_MSHIFT;
 160                                         }
 161                                 if (nchanged > 0)
 162                                         wwtouched[w->ww_cur.r] |= WWU_TOUCHED;
 163                         }
 164                 chklf:
 165                         if (w->ww_cur.c >= w->ww_w.r)
 166                                 goto crlf;
 167                 } else switch (w->ww_wstate) {
 168                 case 0:
 169                         switch (*p++) {
 170                         case '\n':
 171                                 if (ISSET(w->ww_wflags, WWW_MAPNL))
 172                 crlf:
 173                                         w->ww_cur.c = w->ww_w.l;
 174                 lf:
 175                                 UPDATE();
 176                                 if (++w->ww_cur.r >= w->ww_w.b) {
 177                                         w->ww_cur.r = w->ww_w.b - 1;
 178                                         if (w->ww_w.b < w->ww_b.b) {
 179                                                 (void) wwscroll1(w, w->ww_i.t,
 180                                                         w->ww_i.b, 1, 0);
 181                                                 w->ww_buf++;
 182                                                 w->ww_b.t--;
 183                                                 w->ww_b.b--;
 184                                         } else
 185                                                 wwdelline(w, w->ww_b.t);
 186                                 }
 187                                 break;
 188                         case '\b':
 189                                 if (--w->ww_cur.c < w->ww_w.l) {
 190                                         w->ww_cur.c = w->ww_w.r - 1;
 191                                         goto up;
 192                                 }
 193                                 break;
 194                         case '\r':
 195                                 w->ww_cur.c = w->ww_w.l;
 196                                 break;
 197                         case ctrl('g'):
 198                                 ttputc(ctrl('g'));
 199                                 break;
 200                         case ctrl('['):
 201                                 w->ww_wstate = 1;
 202                                 break;
 203                         }
 204                         break;
 205                 case 1:
 206                         w->ww_wstate = 0;
 207                         switch (*p++) {
 208                         case '@':
 209                                 SET(w->ww_wflags, WWW_INSERT);
 210                                 break;
 211                         case 'A':
 212                 up:
 213                                 UPDATE();
 214                                 if (--w->ww_cur.r < w->ww_w.t) {
 215                                         w->ww_cur.r = w->ww_w.t;
 216                                         if (w->ww_w.t > w->ww_b.t) {
 217                                                 (void) wwscroll1(w, w->ww_i.t,
 218                                                         w->ww_i.b, -1, 0);
 219                                                 w->ww_buf--;
 220                                                 w->ww_b.t++;
 221                                                 w->ww_b.b++;
 222                                         } else
 223                                                 wwinsline(w, w->ww_b.t);
 224                                 }
 225                                 break;
 226                         case 'B':
 227                                 goto lf;
 228                         case 'C':
 229                 right:
 230                                 w->ww_cur.c++;
 231                                 goto chklf;
 232                         case 'E':
 233                                 w->ww_buf -= w->ww_w.t - w->ww_b.t;
 234                                 w->ww_b.t = w->ww_w.t;
 235                                 w->ww_b.b = w->ww_b.t + w->ww_b.nr;
 236                                 w->ww_cur.r = w->ww_w.t;
 237                                 w->ww_cur.c = w->ww_w.l;
 238                                 wwclreos(w, w->ww_w.t, w->ww_w.l);
 239                                 break;
 240                         case 'H':
 241                                 UPDATE();
 242                                 w->ww_cur.r = w->ww_w.t;
 243                                 w->ww_cur.c = w->ww_w.l;
 244                                 break;
 245                         case 'J':
 246                                 wwclreos(w, w->ww_cur.r, w->ww_cur.c);
 247                                 break;
 248                         case 'K':
 249                                 wwclreol(w, w->ww_cur.r, w->ww_cur.c);
 250                                 break;
 251                         case 'L':
 252                                 UPDATE();
 253                                 wwinsline(w, w->ww_cur.r);
 254                                 break;
 255                         case 'M':
 256                                 wwdelline(w, w->ww_cur.r);
 257                                 break;
 258                         case 'N':
 259                                 wwdelchar(w, w->ww_cur.r, w->ww_cur.c);
 260                                 break;
 261                         case 'O':
 262                                 CLR(w->ww_wflags, WWW_INSERT);
 263                                 break;
 264                         case 'P':
 265                                 wwinschar(w, w->ww_cur.r, w->ww_cur.c, ' ', 0);
 266                                 break;
 267                         case 'X':
 268                                 wwupdate();
 269                                 break;
 270                         case 'Y':
 271                                 UPDATE();
 272                                 w->ww_wstate = 2;
 273                                 break;
 274                         case 'Z':
 275                                 wwupdate();
 276                                 xxflush(0);
 277                                 break;
 278                         case 's':
 279                                 w->ww_wstate = 4;
 280                                 break;
 281                         case 'r':
 282                                 w->ww_wstate = 5;
 283                                 break;
 284                         }
 285                         break;
 286                 case 2:
 287                         w->ww_cur.r = w->ww_w.t +
 288                                 (unsigned)(*p++ - ' ') % w->ww_w.nr;
 289                         w->ww_wstate = 3;
 290                         break;
 291                 case 3:
 292                         w->ww_cur.c = w->ww_w.l +
 293                                 (unsigned)(*p++ - ' ') % w->ww_w.nc;
 294                         w->ww_wstate = 0;
 295                         break;
 296                 case 4:
 297                         w->ww_modes |= *p++ & wwavailmodes;
 298                         w->ww_wstate = 0;
 299                         break;
 300                 case 5:
 301                         w->ww_modes &= ~*p++;
 302                         w->ww_wstate = 0;
 303                         break;
 304                 }
 305         }
 306         if (hascursor)
 307                 wwcursor(w, 1);
 308         wwnwwr++;
 309         wwnwwra += n;
 310         n = p - savep;
 311         wwnwwrc += n;
 312         return n;
 313 }