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Diffstat (limited to 'lib/libcurses/overlay.c')
| -rw-r--r-- | lib/libcurses/overlay.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/lib/libcurses/overlay.c b/lib/libcurses/overlay.c new file mode 100644 index 00000000000..9f35c79e3fb --- /dev/null +++ b/lib/libcurses/overlay.c @@ -0,0 +1,82 @@ +/* + * Copyright (c) 1981, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifndef lint +static char sccsid[] = "@(#)overlay.c 8.2 (Berkeley) 5/4/94"; +#endif /* not lint */ + +#include <ctype.h> + +#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); +} |