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erase.c revision 1.7.2.2 
      1 /*
      2  * Copyright (c) 1981, 1993, 1994
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char sccsid[] = "@(#)erase.c	8.2 (Berkeley) 5/4/94";
     36 #endif	/* not lint */
     37 
     38 #include "curses.h"
     39 
     40 /*
     41  * werase --
     42  *	Erases everything on the window.
     43  */
     44 int
     45 werase(win)
     46 	register WINDOW *win;
     47 {
     48 
     49 	register int minx, y;
     50 	register __LDATA *sp, *end, *start, *maxx;
     51 
     52 #ifdef DEBUG
     53 	__CTRACE("werase: (%0.2o)\n", win);
     54 #endif
     55 	for (y = 0; y < win->maxy; y++) {
     56 		minx = -1;
     57 		start = win->lines[y]->line;
     58 		end = &start[win->maxx];
     59 		for (sp = start; sp < end; sp++)
     60 			if (sp->ch != ' ' || sp->attr != 0) {
     61 				maxx = sp;
     62 				if (minx == -1)
     63 					minx = sp - start;
     64 				sp->ch = ' ';
     65 				sp->attr = 0;
     66 			}
     67 		if (minx != -1)
     68 			__touchline(win, y, minx, maxx - win->lines[y]->line,
     69 			   0);
     70 	}
     71 	return (OK);
     72 }
     73