Ultrix-3.1/src/libcurses/erase.c

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/**********************************************************************
 *   Copyright (c) Digital Equipment Corporation 1984, 1985, 1986.    *
 *   All Rights Reserved. 					      *
 *   Reference "/usr/src/COPYRIGHT" for applicable restrictions.      *
 **********************************************************************/

/* SCCSID: @(#)erase.c	3.0	4/22/86 */
# include	"curses.ext"

/*
 *	This routine erases everything on the window.
 *
 * 1/27/81 (Berkeley) @(#)erase.c	1.2
 */
werase(win)
reg WINDOW	*win; {

	reg int		y;
	reg char	*sp, *end, *start, *maxx;
	reg int		minx;

# ifdef DEBUG
	fprintf(outf, "WERASE(%0.2o)\n", win);
# endif
	for (y = 0; y < win->_maxy; y++) {
		minx = _NOCHANGE;
		start = win->_y[y];
		end = &start[win->_maxx];
		for (sp = start; sp < end; sp++)
			if (*sp != ' ') {
				maxx = sp;
				if (minx == _NOCHANGE)
					minx = sp - start;
				*sp = ' ';
			}
		if (minx != _NOCHANGE) {
			if (win->_firstch[y] > minx
			     || win->_firstch[y] == _NOCHANGE)
				win->_firstch[y] = minx;
			if (win->_lastch[y] < maxx - win->_y[y])
				win->_lastch[y] = maxx - win->_y[y];
		}
	}
	win->_curx = win->_cury = 0;
}