ncurses/lib_erase.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                           *
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  21
  22
  23 /*
  24 **      lib_erase.c
  25 **
  26 **      The routine werase().
  27 **
  28 */
  29
  30 #include <curses.priv.h>
  31
  32 MODULE_ID("$Id: lib_erase.c,v 1.7 1997/02/01 23:18:18 tom Exp $")
  33
  34 int  werase(WINDOW      *win)
  35 {
  36 int     y;
  37 chtype  *sp, *end, *start, *maxx = NULL;
  38 short   minx;
  39
  40         T((T_CALLED("werase(%p)"), win));
  41
  42         for (y = 0; y <= win->_maxy; y++) {
  43                 minx = _NOCHANGE;
  44                 start = win->_line[y].text;
  45                 end = &start[win->_maxx];
  46
  47                 maxx = start;
  48                 for (sp = start; sp <= end; sp++) {
  49                         maxx = sp;
  50                         if (minx == _NOCHANGE)
  51                                         minx = sp - start;
  52                         *sp = _nc_background(win);
  53                 }
  54
  55                 if (minx != _NOCHANGE) {
  56                         if (win->_line[y].firstchar > minx ||
  57                             win->_line[y].firstchar == _NOCHANGE)
  58                                 win->_line[y].firstchar = minx;
  59
  60                         if (win->_line[y].lastchar < maxx - win->_line[y].text)
  61                             win->_line[y].lastchar = maxx - win->_line[y].text;
  62                 }
  63         }
  64         win->_curx = win->_cury = 0;
  65         win->_flags &= ~_WRAPPED;
  66         _nc_synchook(win);
  67         returnCode(OK);
  68 }