usr/src/ucblib/libcurses/overlay.c

   1 /*
   2  * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
   7 /*        All Rights Reserved   */
   8
   9 /*
  10  * Copyright (c) 1980 Regents of the University of California.
  11  * All rights reserved.  The Berkeley software License Agreement
  12  * specifies the terms and conditions for redistribution.
  13  */
  14
  15 #pragma ident   "%Z%%M% %I%     %E% SMI"
  16
  17 /*LINTLIBRARY*/
  18
  19 #ifndef lint
  20 static char
  21 sccsid[] = "@(#)overlay.c 1.9 89/07/13 SMI"; /* from UCB 5.2 86/02/12 */
  22 #endif /* not lint */
  23
  24 #include        "curses.ext"
  25 #include        <ctype.h>
  26
  27 #define min(a, b)       ((a) < (b) ? (a) : (b))
  28 #define max(a, b)       ((a) > (b) ? (a) : (b))
  29
  30 /*
  31  *      This routine writes win1 on win2 non-destructively.
  32  */
  33
  34 int
  35 overlay(WINDOW *win1, WINDOW *win2)
  36 {
  37         char    *sp, *end;
  38         int     x, y, endy, endx, starty, startx;
  39         int     y1, y2;
  40
  41 #ifdef DEBUG
  42         fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
  43 #endif
  44         starty = max(win1->_begy, win2->_begy);
  45         startx = max(win1->_begx, win2->_begx);
  46         endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begy);
  47         endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
  48 #ifdef DEBUG
  49         fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n",
  50             starty, startx, endy, endx);
  51 #endif
  52         if (starty >= endy || startx >= endx)
  53                 return (OK);
  54         y1 = starty - win1->_begy;
  55         y2 = starty - win2->_begy;
  56         for (y = starty; y < endy; y++, y1++, y2++) {
  57                 end = &win1->_y[y1][endx - win1->_begx];
  58                 x = startx - win2->_begx;
  59                 for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
  60                         if (!isspace(*sp))
  61                                 (void) mvwaddch(win2, y2, x, *sp);
  62                         x++;
  63                 }
  64         }
  65         return (OK);
  66 }