usr/src/lib/libcurses/erase.c

/*
 * Copyright (c) 1981 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static char sccsid[] = "@(#)erase.c     5.4 (Berkeley) 6/1/90";
#endif /* not lint */

# include       "curses.ext"

/*
 *      This routine erases everything on the window.
 *
 */
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)
                        touchline(win, y, minx, maxx - win->_y[y]);
        }
        win->_curx = win->_cury = 0;
}