4.3BSD-Reno/src/usr.bin/window/wwredrawwin.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Wang at The University of California, Berkeley.
 *
 * 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[] = "@(#)wwredrawwin.c	3.16 (Berkeley) 6/6/90";
#endif /* not lint */

#include "ww.h"

wwredrawwin1(w, row1, row2, offset)
register struct ww *w;
int row1, row2, offset;
{
	int row;
	register col;
	register char *smap;
	register union ww_char *buf;
	register char *win;
	register union ww_char *ns;
	int x;
	int nchanged;

	for (row = row1; row < row2; row++) {
		col = w->ww_i.l;
		ns = wwns[row];
		smap = &wwsmap[row][col];
		buf = w->ww_buf[row + offset];
		win = w->ww_win[row];
		nchanged = 0;
		for (; col < w->ww_i.r; col++)
			if (*smap++ == w->ww_index &&
			    ns[col].c_w !=
			    (x = buf[col].c_w ^ win[col] << WWC_MSHIFT)) {
				nchanged++;
				ns[col].c_w = x;
			}
		if (nchanged > 0)
			wwtouched[row] |= WWU_TOUCHED;
	}
}