ncurses/lib_clrbot.c

   1
   2 /***************************************************************************
   3 *                            COPYRIGHT NOTICE                              *
   4 ****************************************************************************
   5 *                ncurses is copyright (C) 1992-1995                        *
   6 *                          Zeyd M. Ben-Halim                               *
   7 *                          zmbenhal@netcom.com                             *
   8 *                          Eric S. Raymond                                 *
   9 *                          esr@snark.thyrsus.com                           *
  10 *                                                                          *
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  21
  22 /*
  23 **      lib_clrbot.c
  24 **
  25 **      The routine wclrtobot().
  26 **
  27 */
  28
  29 #include <curses.priv.h>
  30
  31 MODULE_ID("$Id: lib_clrbot.c,v 1.9 1997/02/01 23:18:18 tom Exp $")
  32
  33 int wclrtobot(WINDOW *win)
  34 {
  35 chtype  *ptr, *end, *maxx = NULL;
  36 short   y, startx, minx;
  37
  38         T((T_CALLED("wclrtobot(%p)"), win));
  39
  40         startx = win->_curx;
  41
  42         T(("clearing from y = %d to y = %d with maxx =  %d", win->_cury, win->_maxy, win->_maxx));
  43
  44         for (y = win->_cury; y <= win->_maxy; y++) {
  45                 minx = _NOCHANGE;
  46                 end = &win->_line[y].text[win->_maxx];
  47
  48                 for (ptr = &win->_line[y].text[startx]; ptr <= end; ptr++) {
  49                         chtype blank = _nc_background(win);
  50
  51                         if (*ptr != blank) {
  52                                 maxx = ptr;
  53                                 if (minx == _NOCHANGE)
  54                                         minx = ptr - win->_line[y].text;
  55                                 *ptr = blank;
  56                         }
  57                 }
  58
  59                 if (minx != _NOCHANGE) {
  60                         if (win->_line[y].firstchar > minx
  61                                         ||  win->_line[y].firstchar == _NOCHANGE)
  62                             win->_line[y].firstchar = minx;
  63
  64                         if (win->_line[y].lastchar < maxx - win->_line[y].text)
  65                             win->_line[y].lastchar = maxx - win->_line[y].text;
  66                 }
  67
  68                 startx = 0;
  69         }
  70         _nc_synchook(win);
  71         returnCode(OK);
  72 }