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      1 /*
      2  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
      3  * Use is subject to license terms.
      4  */
      5 
      6 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
      7 /*	  All Rights Reserved  	*/
      8 
      9 /*
     10  * Copyright (c) 1980 Regents of the University of California.
     11  * All rights reserved.  The Berkeley software License Agreement
     12  * specifies the terms and conditions for redistribution.
     13  */
     14 
     15 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     16 
     17 /*LINTLIBRARY*/
     18 
     19 #ifndef lint
     20 static char
     21 sccsid[] = "@(#)erase.c 1.6 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
     22 #endif	/* not lint */
     23 
     24 #include	<stddef.h>
     25 #include	"curses.ext"
     26 
     27 /*
     28  *	This routine erases everything on the window.
     29  */
     30 
     31 int
     32 werase(WINDOW *win)
     33 {
     34 	int	y;
     35 	char	*sp, *end, *start, *maxx;
     36 	ptrdiff_t	minx;
     37 
     38 #ifdef DEBUG
     39 	fprintf(outf, "WERASE(%0.2o)\n", win);
     40 #endif
     41 	for (y = 0; y < win->_maxy; y++) {
     42 		minx = _NOCHANGE;
     43 		start = win->_y[y];
     44 		end = &start[win->_maxx];
     45 		for (sp = start; sp < end; sp++)
     46 			if (*sp != ' ') {
     47 				maxx = sp;
     48 				if (minx == _NOCHANGE)
     49 					minx = sp - start;
     50 				*sp = ' ';
     51 			}
     52 		if (minx != _NOCHANGE)
     53 			(void) touchline(win, y, (int)minx,
     54 				(int)(maxx - win->_y[y]));
     55 	}
     56 	win->_curx = win->_cury = 0;
     57 	return (OK);
     58 }
     59