usr.bin/window/wwwrite.c

   1 /*      @(#)wwwrite.c   8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: wwwrite.c,v 1.9 2009/04/14 08:50:06 lukem Exp $        */
   3
   4 /*
   5  * Copyright (c) 1983, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Edward Wang at The University of California, Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "ww.h"
  37 #include "tt.h"
  38 #include "xx.h"
  39 #include "char.h"
  40
  41 #define UPDATE() \
  42         if (!ISSET(w->ww_wflags, WWW_NOUPDATE) && w->ww_cur.r >= 0 && \
  43             w->ww_cur.r < wwnrow && wwtouched[w->ww_cur.r]) \
  44                 wwupdate1(w->ww_cur.r, w->ww_cur.r + 1)
  45
  46 /*
  47  * To support control character expansion, we save the old
  48  * p and q values in r and s, and point p at the beginning
  49  * of the expanded string, and q at some safe place beyond it
  50  * (p + 10).  At strategic points in the loops, we check
  51  * for (r && !*p) and restore the saved values back into
  52  * p and q.  Essentially, we implement a stack of depth 2,
  53  * to avoid recursion, which might be a better idea.
  54  */
  55 int
  56 wwwrite(struct ww *w, const char *p, int n)
  57 {
  58         int hascursor;
  59         const char *savep = p;
  60         const char *q = p + n;
  61         const char *r = NULL;
  62         const char *s = NULL;
  63
  64 #ifdef lint
  65         s = NULL;                       /* define it before possible use */
  66 #endif
  67         hascursor = ISSET(w->ww_wflags, WWW_HASCURSOR);
  68         if (hascursor)
  69                 wwcursor(w, 0);
  70         while (p < q && !ISSET(w->ww_pflags, WWP_STOPPED) &&
  71             (!wwinterrupt() || ISSET(w->ww_wflags, WWW_NOINTR))) {
  72                 if (r && !*p) {
  73                         p = r;
  74                         q = s;
  75                         r = NULL;
  76                         continue;
  77                 }
  78                 if (w->ww_wstate == 0 &&
  79                     (isprt(*p) ||
  80                     (ISSET(w->ww_wflags, WWW_UNCTRL) && isunctrl(*p)))) {
  81                         int i;
  82                         union ww_char *bp;
  83                         int col, col1;
  84
  85                         if (ISSET(w->ww_wflags, WWW_INSERT)) {
  86                                 /* this is very slow */
  87                                 if (*p == '\t') {
  88                                         p++;
  89                                         w->ww_cur.c += 8 -
  90                                                 ((w->ww_cur.c - w->ww_w.l) & 7);
  91                                         goto chklf;
  92                                 }
  93                                 if (!isprt(*p)) {
  94                                         r = p + 1;
  95                                         s = q;
  96                                         p = unctrl(*p);
  97                                         q = p + 10;
  98                                 }
  99                                 wwinschar(w, w->ww_cur.r, w->ww_cur.c,
 100                                         *p++, w->ww_modes);
 101                                 goto right;
 102                         }
 103
 104                         bp = &w->ww_buf[w->ww_cur.r][w->ww_cur.c];
 105                         i = w->ww_cur.c;
 106                         while (i < w->ww_w.r && p < q)
 107                                 if (!*p && r) {
 108                                         p = r;
 109                                         q = s;
 110                                         r = NULL;
 111                                 } else if (*p == '\t') {
 112                                         int tmp = 8 - ((i - w->ww_w.l) & 7);
 113                                         p++;
 114                                         i += tmp;
 115                                         bp += tmp;
 116                                 } else if (isprt(*p)) {
 117                                         bp++->c_w = *p++
 118                                                 | w->ww_modes << WWC_MSHIFT;
 119                                         i++;
 120                                 } else if (ISSET(w->ww_wflags, WWW_UNCTRL) &&
 121                                            isunctrl(*p)) {
 122                                         r = p + 1;
 123                                         s = q;
 124                                         p = unctrl(*p);
 125                                         q = p + 10;
 126                                 } else
 127                                         break;
 128                         col = MAX(w->ww_cur.c, w->ww_i.l);
 129                         col1 = MIN(i, w->ww_i.r);
 130                         w->ww_cur.c = i;
 131                         if (w->ww_cur.r >= w->ww_i.t
 132                             && w->ww_cur.r < w->ww_i.b) {
 133                                 union ww_char *ns = wwns[w->ww_cur.r];
 134                                 unsigned char *smap =
 135                                     &wwsmap[w->ww_cur.r][col];
 136                                 char *win = w->ww_win[w->ww_cur.r];
 137                                 int nchanged = 0;
 138
 139                                 bp = w->ww_buf[w->ww_cur.r];
 140                                 for (i = col; i < col1; i++)
 141                                         if (*smap++ == w->ww_index) {
 142                                                 nchanged++;
 143                                                 ns[i].c_w = bp[i].c_w
 144                                                         ^ win[i] << WWC_MSHIFT;
 145                                         }
 146                                 if (nchanged > 0)
 147                                         wwtouched[w->ww_cur.r] |= WWU_TOUCHED;
 148                         }
 149                 chklf:
 150                         if (w->ww_cur.c >= w->ww_w.r)
 151                                 goto crlf;
 152                 } else switch (w->ww_wstate) {
 153                 case 0:
 154                         switch (*p++) {
 155                         case '\n':
 156                                 if (ISSET(w->ww_wflags, WWW_MAPNL))
 157                 crlf:
 158                                         w->ww_cur.c = w->ww_w.l;
 159                 lf:
 160                                 UPDATE();
 161                                 if (++w->ww_cur.r >= w->ww_w.b) {
 162                                         w->ww_cur.r = w->ww_w.b - 1;
 163                                         if (w->ww_w.b < w->ww_b.b) {
 164                                                 (void) wwscroll1(w, w->ww_i.t,
 165                                                         w->ww_i.b, 1, 0);
 166                                                 w->ww_buf++;
 167                                                 w->ww_b.t--;
 168                                                 w->ww_b.b--;
 169                                         } else
 170                                                 wwdelline(w, w->ww_b.t);
 171                                 }
 172                                 break;
 173                         case '\b':
 174                                 if (--w->ww_cur.c < w->ww_w.l) {
 175                                         w->ww_cur.c = w->ww_w.r - 1;
 176                                         goto up;
 177                                 }
 178                                 break;
 179                         case '\r':
 180                                 w->ww_cur.c = w->ww_w.l;
 181                                 break;
 182                         case ctrl('g'):
 183                                 ttputc(ctrl('g'));
 184                                 break;
 185                         case ctrl('['):
 186                                 w->ww_wstate = 1;
 187                                 break;
 188                         }
 189                         break;
 190                 case 1:
 191                         w->ww_wstate = 0;
 192                         switch (*p++) {
 193                         case '@':
 194                                 SET(w->ww_wflags, WWW_INSERT);
 195                                 break;
 196                         case 'A':
 197                 up:
 198                                 UPDATE();
 199                                 if (--w->ww_cur.r < w->ww_w.t) {
 200                                         w->ww_cur.r = w->ww_w.t;
 201                                         if (w->ww_w.t > w->ww_b.t) {
 202                                                 (void) wwscroll1(w, w->ww_i.t,
 203                                                         w->ww_i.b, -1, 0);
 204                                                 w->ww_buf--;
 205                                                 w->ww_b.t++;
 206                                                 w->ww_b.b++;
 207                                         } else
 208                                                 wwinsline(w, w->ww_b.t);
 209                                 }
 210                                 break;
 211                         case 'B':
 212                                 goto lf;
 213                         case 'C':
 214                 right:
 215                                 w->ww_cur.c++;
 216                                 goto chklf;
 217                         case 'E':
 218                                 w->ww_buf -= w->ww_w.t - w->ww_b.t;
 219                                 w->ww_b.t = w->ww_w.t;
 220                                 w->ww_b.b = w->ww_b.t + w->ww_b.nr;
 221                                 w->ww_cur.r = w->ww_w.t;
 222                                 w->ww_cur.c = w->ww_w.l;
 223                                 wwclreos(w, w->ww_w.t, w->ww_w.l);
 224                                 break;
 225                         case 'H':
 226                                 UPDATE();
 227                                 w->ww_cur.r = w->ww_w.t;
 228                                 w->ww_cur.c = w->ww_w.l;
 229                                 break;
 230                         case 'J':
 231                                 wwclreos(w, w->ww_cur.r, w->ww_cur.c);
 232                                 break;
 233                         case 'K':
 234                                 wwclreol(w, w->ww_cur.r, w->ww_cur.c);
 235                                 break;
 236                         case 'L':
 237                                 UPDATE();
 238                                 wwinsline(w, w->ww_cur.r);
 239                                 break;
 240                         case 'M':
 241                                 wwdelline(w, w->ww_cur.r);
 242                                 break;
 243                         case 'N':
 244                                 wwdelchar(w, w->ww_cur.r, w->ww_cur.c);
 245                                 break;
 246                         case 'O':
 247                                 CLR(w->ww_wflags, WWW_INSERT);
 248                                 break;
 249                         case 'P':
 250                                 wwinschar(w, w->ww_cur.r, w->ww_cur.c, ' ', 0);
 251                                 break;
 252                         case 'X':
 253                                 wwupdate();
 254                                 break;
 255                         case 'Y':
 256                                 UPDATE();
 257                                 w->ww_wstate = 2;
 258                                 break;
 259                         case 'Z':
 260                                 wwupdate();
 261                                 xxflush(0);
 262                                 break;
 263                         case 's':
 264                                 w->ww_wstate = 4;
 265                                 break;
 266                         case 'r':
 267                                 w->ww_wstate = 5;
 268                                 break;
 269                         }
 270                         break;
 271                 case 2:
 272                         w->ww_cur.r = w->ww_w.t +
 273                                 (unsigned)(*p++ - ' ') % w->ww_w.nr;
 274                         w->ww_wstate = 3;
 275                         break;
 276                 case 3:
 277                         w->ww_cur.c = w->ww_w.l +
 278                                 (unsigned)(*p++ - ' ') % w->ww_w.nc;
 279                         w->ww_wstate = 0;
 280                         break;
 281                 case 4:
 282                         w->ww_modes |= *p++ & wwavailmodes;
 283                         w->ww_wstate = 0;
 284                         break;
 285                 case 5:
 286                         w->ww_modes &= ~*p++;
 287                         w->ww_wstate = 0;
 288                         break;
 289                 }
 290         }
 291         if (hascursor)
 292                 wwcursor(w, 1);
 293         wwnwwr++;
 294         wwnwwra += n;
 295         n = p - savep;
 296         wwnwwrc += n;
 297         return n;
 298 }