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erase.c revision 1.1.1.1 
      1 /*
      2  * Copyright (c) 1981 Regents of the University of California.
      3  * 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	5.4 (Berkeley) 6/1/90";
     36 #endif /* not lint */
     37 
     38 # include	"curses.ext"
     39 
     40 /*
     41  *	This routine erases everything on the window.
     42  *
     43  */
     44 werase(win)
     45 reg WINDOW	*win; {
     46 
     47 	reg int		y;
     48 	reg char	*sp, *end, *start, *maxx;
     49 	reg int		minx;
     50 
     51 # ifdef DEBUG
     52 	fprintf(outf, "WERASE(%0.2o)\n", win);
     53 # endif
     54 	for (y = 0; y < win->_maxy; y++) {
     55 		minx = _NOCHANGE;
     56 		start = win->_y[y];
     57 		end = &start[win->_maxx];
     58 		for (sp = start; sp < end; sp++)
     59 			if (*sp != ' ') {
     60 				maxx = sp;
     61 				if (minx == _NOCHANGE)
     62 					minx = sp - start;
     63 				*sp = ' ';
     64 			}
     65 		if (minx != _NOCHANGE)
     66 			touchline(win, y, minx, maxx - win->_y[y]);
     67 	}
     68 	win->_curx = win->_cury = 0;
     69 }
     70