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         hascursor = ISSET(w->ww_wflags, WWW_HASCURSOR);
  65         if (hascursor)
  66                 wwcursor(w, 0);
  67         while (p < q && !ISSET(w->ww_pflags, WWP_STOPPED) &&
  68             (!wwinterrupt() || ISSET(w->ww_wflags, WWW_NOINTR))) {
  69                 if (r && !*p) {
  70                         p = r;
  71                         q = s;
  72                         r = NULL;
  73                         continue;
  74                 }
  75                 if (w->ww_wstate == 0 &&
  76                     (isprt(*p) ||
  77                     (ISSET(w->ww_wflags, WWW_UNCTRL) && isunctrl(*p)))) {
  78                         int i;
  79                         union ww_char *bp;
  80                         int col, col1;
  81
  82                         if (ISSET(w->ww_wflags, WWW_INSERT)) {
  83                                 /* this is very slow */
  84                                 if (*p == '\t') {
  85                                         p++;
  86                                         w->ww_cur.c += 8 -
  87                                                 ((w->ww_cur.c - w->ww_w.l) & 7);
  88                                         goto chklf;
  89                                 }
  90                                 if (!isprt(*p)) {
  91                                         r = p + 1;
  92                                         s = q;
  93                                         p = unctrl(*p);
  94                                         q = p + 10;
  95                                 }
  96                                 wwinschar(w, w->ww_cur.r, w->ww_cur.c,
  97                                         *p++, w->ww_modes);
  98                                 goto right;
  99                         }
 100
 101                         bp = &w->ww_buf[w->ww_cur.r][w->ww_cur.c];
 102                         i = w->ww_cur.c;
 103                         while (i < w->ww_w.r && p < q)
 104                                 if (!*p && r) {
 105                                         p = r;
 106                                         q = s;
 107                                         r = NULL;
 108                                 } else if (*p == '\t') {
 109                                         int tmp = 8 - ((i - w->ww_w.l) & 7);
 110                                         p++;
 111                                         i += tmp;
 112                                         bp += tmp;
 113                                 } else if (isprt(*p)) {
 114                                         bp++->c_w = *p++
 115                                                 | w->ww_modes << WWC_MSHIFT;
 116                                         i++;
 117                                 } else if (ISSET(w->ww_wflags, WWW_UNCTRL) &&
 118                                            isunctrl(*p)) {
 119                                         r = p + 1;
 120                                         s = q;
 121                                         p = unctrl(*p);
 122                                         q = p + 10;
 123                                 } else
 124                                         break;
 125                         col = MAX(w->ww_cur.c, w->ww_i.l);
 126                         col1 = MIN(i, w->ww_i.r);
 127                         w->ww_cur.c = i;
 128                         if (w->ww_cur.r >= w->ww_i.t
 129                             && w->ww_cur.r < w->ww_i.b) {
 130                                 union ww_char *ns = wwns[w->ww_cur.r];
 131                                 unsigned char *smap =
 132                                     &wwsmap[w->ww_cur.r][col];
 133                                 char *win = w->ww_win[w->ww_cur.r];
 134                                 int nchanged = 0;
 135
 136                                 bp = w->ww_buf[w->ww_cur.r];
 137                                 for (i = col; i < col1; i++)
 138                                         if (*smap++ == w->ww_index) {
 139                                                 nchanged++;
 140                                                 ns[i].c_w = bp[i].c_w
 141                                                         ^ win[i] << WWC_MSHIFT;
 142                                         }
 143                                 if (nchanged > 0)
 144                                         wwtouched[w->ww_cur.r] |= WWU_TOUCHED;
 145                         }
 146                 chklf:
 147                         if (w->ww_cur.c >= w->ww_w.r)
 148                                 goto crlf;
 149                 } else switch (w->ww_wstate) {
 150                 case 0:
 151                         switch (*p++) {
 152                         case '\n':
 153                                 if (ISSET(w->ww_wflags, WWW_MAPNL))
 154                 crlf:
 155                                         w->ww_cur.c = w->ww_w.l;
 156                 lf:
 157                                 UPDATE();
 158                                 if (++w->ww_cur.r >= w->ww_w.b) {
 159                                         w->ww_cur.r = w->ww_w.b - 1;
 160                                         if (w->ww_w.b < w->ww_b.b) {
 161                                                 (void) wwscroll1(w, w->ww_i.t,
 162                                                         w->ww_i.b, 1, 0);
 163                                                 w->ww_buf++;
 164                                                 w->ww_b.t--;
 165                                                 w->ww_b.b--;
 166                                         } else
 167                                                 wwdelline(w, w->ww_b.t);
 168                                 }
 169                                 break;
 170                         case '\b':
 171                                 if (--w->ww_cur.c < w->ww_w.l) {
 172                                         w->ww_cur.c = w->ww_w.r - 1;
 173                                         goto up;
 174                                 }
 175                                 break;
 176                         case '\r':
 177                                 w->ww_cur.c = w->ww_w.l;
 178                                 break;
 179                         case ctrl('g'):
 180                                 ttputc(ctrl('g'));
 181                                 break;
 182                         case ctrl('['):
 183                                 w->ww_wstate = 1;
 184                                 break;
 185                         }
 186                         break;
 187                 case 1:
 188                         w->ww_wstate = 0;
 189                         switch (*p++) {
 190                         case '@':
 191                                 SET(w->ww_wflags, WWW_INSERT);
 192                                 break;
 193                         case 'A':
 194                 up:
 195                                 UPDATE();
 196                                 if (--w->ww_cur.r < w->ww_w.t) {
 197                                         w->ww_cur.r = w->ww_w.t;
 198                                         if (w->ww_w.t > w->ww_b.t) {
 199                                                 (void) wwscroll1(w, w->ww_i.t,
 200                                                         w->ww_i.b, -1, 0);
 201                                                 w->ww_buf--;
 202                                                 w->ww_b.t++;
 203                                                 w->ww_b.b++;
 204                                         } else
 205                                                 wwinsline(w, w->ww_b.t);
 206                                 }
 207                                 break;
 208                         case 'B':
 209                                 goto lf;
 210                         case 'C':
 211                 right:
 212                                 w->ww_cur.c++;
 213                                 goto chklf;
 214                         case 'E':
 215                                 w->ww_buf -= w->ww_w.t - w->ww_b.t;
 216                                 w->ww_b.t = w->ww_w.t;
 217                                 w->ww_b.b = w->ww_b.t + w->ww_b.nr;
 218                                 w->ww_cur.r = w->ww_w.t;
 219                                 w->ww_cur.c = w->ww_w.l;
 220                                 wwclreos(w, w->ww_w.t, w->ww_w.l);
 221                                 break;
 222                         case 'H':
 223                                 UPDATE();
 224                                 w->ww_cur.r = w->ww_w.t;
 225                                 w->ww_cur.c = w->ww_w.l;
 226                                 break;
 227                         case 'J':
 228                                 wwclreos(w, w->ww_cur.r, w->ww_cur.c);
 229                                 break;
 230                         case 'K':
 231                                 wwclreol(w, w->ww_cur.r, w->ww_cur.c);
 232                                 break;
 233                         case 'L':
 234                                 UPDATE();
 235                                 wwinsline(w, w->ww_cur.r);
 236                                 break;
 237                         case 'M':
 238                                 wwdelline(w, w->ww_cur.r);
 239                                 break;
 240                         case 'N':
 241                                 wwdelchar(w, w->ww_cur.r, w->ww_cur.c);
 242                                 break;
 243                         case 'O':
 244                                 CLR(w->ww_wflags, WWW_INSERT);
 245                                 break;
 246                         case 'P':
 247                                 wwinschar(w, w->ww_cur.r, w->ww_cur.c, ' ', 0);
 248                                 break;
 249                         case 'X':
 250                                 wwupdate();
 251                                 break;
 252                         case 'Y':
 253                                 UPDATE();
 254                                 w->ww_wstate = 2;
 255                                 break;
 256                         case 'Z':
 257                                 wwupdate();
 258                                 xxflush(0);
 259                                 break;
 260                         case 's':
 261                                 w->ww_wstate = 4;
 262                                 break;
 263                         case 'r':
 264                                 w->ww_wstate = 5;
 265                                 break;
 266                         }
 267                         break;
 268                 case 2:
 269                         w->ww_cur.r = w->ww_w.t +
 270                                 (unsigned)(*p++ - ' ') % w->ww_w.nr;
 271                         w->ww_wstate = 3;
 272                         break;
 273                 case 3:
 274                         w->ww_cur.c = w->ww_w.l +
 275                                 (unsigned)(*p++ - ' ') % w->ww_w.nc;
 276                         w->ww_wstate = 0;
 277                         break;
 278                 case 4:
 279                         w->ww_modes |= *p++ & wwavailmodes;
 280                         w->ww_wstate = 0;
 281                         break;
 282                 case 5:
 283                         w->ww_modes &= ~*p++;
 284                         w->ww_wstate = 0;
 285                         break;
 286                 }
 287         }
 288         if (hascursor)
 289                 wwcursor(w, 1);
 290         wwnwwr++;
 291         wwnwwra += n;
 292         n = p - savep;
 293         wwnwwrc += n;
 294         return n;
 295 }