usr/src/lib/libcurses/overwrite.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)overwrite.c 5.1 (Berkeley) %G%";
#endif not lint

# include       "curses.ext"
# include       <ctype.h>

# define        min(a,b)        (a < b ? a : b)
# define        max(a,b)        (a > b ? a : b)

/*
 *      This routine writes win1 on win2 destructively.
 *
 */
overwrite(win1, win2)
reg WINDOW      *win1, *win2; {

        reg char        *sp, *end;
        reg int         x, y, endy, endx, starty, startx;

# ifdef DEBUG
        fprintf(outf, "OVERWRITE(%0.2o, %0.2o);\n", win1, win2);
# endif
        starty = max(win1->_begy, win2->_begy);
        startx = max(win1->_begx, win2->_begx);
        endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begx);
        endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
        if (starty >= endy || startx >= endx)
                return;
# ifdef DEBUG
        fprintf(outf, "OVERWRITE:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx);
# endif
        x = endx - startx;
        for (y = starty; y < endy; y++) {
                bcopy(&win1->_y[y - win1->_begy][startx - win1->_begx],
                      &win2->_y[y - win2->_begy][startx - win2->_begx], x);
                touchline(win2, y, startx - win2->_begx, endx - win2->_begx);
        }
}