4.3BSD - /usr/src/ucb/window/wwdelchar.c

   1: #ifndef lint
   2: static char sccsid[] = "@(#)wwdelchar.c	3.11 4/24/85";
   3: #endif
   4: 
   5: /*
   6:  * Copyright (c) 1983 Regents of the University of California,
   7:  * All rights reserved.  Redistribution permitted subject to
   8:  * the terms of the Berkeley Software License Agreement.
   9:  */
  10: 
  11: #include "ww.h"
  12: #include "tt.h"
  13: 
  14: wwdelchar(w, row, col)
  15: register struct ww *w;
  16: {
  17:     register i;
  18:     int nvis;
  19: 
  20:     /*
  21: 	 * First, shift the line.
  22: 	 */
  23:     {
  24:         register union ww_char *p, *q;
  25: 
  26:         p = &w->ww_buf[row][col];
  27:         q = p + 1;
  28:         for (i = w->ww_b.r - col; --i > 0;)
  29:             *p++ = *q++;
  30:         p->c_w = ' ';
  31:     }
  32: 
  33:     /*
  34: 	 * If can't see it, just return.
  35: 	 */
  36:     if (row < w->ww_i.t || row >= w->ww_i.b
  37:         || w->ww_i.r <= 0 || w->ww_i.r <= col)
  38:         return;
  39: 
  40:     if (col < w->ww_i.l)
  41:         col = w->ww_i.l;
  42: 
  43:     /*
  44: 	 * Now find out how much is actually changed, and fix wwns.
  45: 	 */
  46:     {
  47:         register union ww_char *buf;
  48:         register char *win;
  49:         register union ww_char *ns;
  50:         register char *smap;
  51:         char touched;
  52: 
  53:         nvis = 0;
  54:         smap = &wwsmap[row][col];
  55:         for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
  56:             ;
  57:         if (i >= w->ww_i.r)
  58:             return;
  59:         col = i;
  60:         buf = w->ww_buf[row];
  61:         win = w->ww_win[row];
  62:         ns = wwns[row];
  63:         smap = &wwsmap[row][i];
  64:         touched = wwtouched[row];
  65:         for (; i < w->ww_i.r; i++) {
  66:             if (*smap++ != w->ww_index)
  67:                 continue;
  68:             touched |= WWU_TOUCHED;
  69:             if (win[i])
  70:                 ns[i].c_w =
  71:                     buf[i].c_w ^ win[i] << WWC_MSHIFT;
  72:             else {
  73:                 nvis++;
  74:                 ns[i] = buf[i];
  75:             }
  76:         }
  77:         wwtouched[row] = touched;
  78:     }
  79: 
  80:     /*
  81: 	 * Can/Should we use delete character?
  82: 	 */
  83:     if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) {
  84:         register union ww_char *p, *q;
  85: 
  86:         (*tt.tt_move)(row, col);
  87:         (*tt.tt_delchar)();
  88: 
  89:         p = &wwos[row][col];
  90:         q = p + 1;
  91:         for (i = wwncol - col; --i > 0;)
  92:             *p++ = *q++;
  93:         p->c_w = ' ';
  94:     }
  95: }

Defined functions

Defined variables