lib/libcurses/toucholap.c

   1 /*      $NetBSD: toucholap.c,v 1.14 2003/08/07 16:44:24 agc Exp $       */
   2
   3 /*
   4  * Copyright (c) 1981, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)toucholap.c 8.2 (Berkeley) 5/4/94";
  36 #else
  37 __RCSID("$NetBSD: toucholap.c,v 1.14 2003/08/07 16:44:24 agc Exp $");
  38 #endif
  39 #endif                          /* not lint */
  40
  41 #include "curses.h"
  42 #include "curses_private.h"
  43
  44 /*
  45  * touchoverlap --
  46  *      Touch, on win2, the part that overlaps with win1.
  47  */
  48 int
  49 touchoverlap(WINDOW *win1, WINDOW *win2)
  50 {
  51         int     y, endy, endx, starty, startx;
  52
  53 #ifdef DEBUG
  54         __CTRACE(__CTRACE_WINDOW, "touchoverlap: (%p, %p);\n", win1, win2);
  55 #endif
  56         starty = max(win1->begy, win2->begy);
  57         startx = max(win1->begx, win2->begx);
  58         endy = min(win1->maxy + win1->begy, win2->maxy + win2->begx);
  59         endx = min(win1->maxx + win1->begx, win2->maxx + win2->begx);
  60 #ifdef DEBUG
  61         __CTRACE(__CTRACE_WINDOW, "touchoverlap: from (%d,%d) to (%d,%d)\n",
  62             starty, startx, endy, endx);
  63         __CTRACE(__CTRACE_WINDOW, "touchoverlap: win1 (%d,%d) to (%d,%d)\n",
  64             win1->begy, win1->begx, win1->begy + win1->maxy,
  65             win1->begx + win1->maxx);
  66         __CTRACE(__CTRACE_WINDOW, "touchoverlap: win2 (%d,%d) to (%d,%d)\n",
  67             win2->begy, win2->begx, win2->begy + win2->maxy,
  68             win2->begx + win2->maxx);
  69 #endif
  70         if (starty >= endy || startx >= endx)
  71                 return (OK);
  72         starty -= win2->begy;
  73         startx -= win2->begx;
  74         endy -= win2->begy;
  75         endx -= win2->begx;
  76         for (--endx, y = starty; y < endy; y++)
  77                 __touchline(win2, y, startx, endx);
  78         return (OK);
  79 }