/* * Copyright (c) 1981, 1993, 1994 * The Regents of the University of California. All rights reserved. * * %sccs.include.redist.c% */ #ifndef lint static char sccsid[] = "@(#)overlay.c 8.2 (Berkeley) 05/04/94"; #endif /* not lint */ #include #include "curses.h" /* * overlay -- * Writes win1 on win2 non-destructively. */ int overlay(win1, win2) register WINDOW *win1, *win2; { register int x, y, y1, y2, endy, endx, starty, startx; register __LDATA *sp, *end; #ifdef DEBUG __CTRACE("overlay: (%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); #ifdef DEBUG __CTRACE("overlay: from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx); #endif if (starty >= endy || startx >= endx) return (OK); y1 = starty - win1->begy; y2 = starty - win2->begy; for (y = starty; y < endy; y++, y1++, y2++) { end = &win1->lines[y1]->line[endx - win1->begx]; x = startx - win2->begx; for (sp = &win1->lines[y1]->line[startx - win1->begx]; sp < end; sp++) { if (!isspace(sp->ch)) { wmove(win2, y2, x); __waddch(win2, sp); } x++; } } return (OK); }