usr/src/ucblib/libcurses/overwrite.c

   1 /*
   2  * Copyright 2004 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[] = "@(#)overwrite.c 1.7 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
  22 #endif  /* not lint */
  23
  24 #include        "curses.ext"
  25 #include        <ctype.h>
  26 #include        <string.h>
  27
  28 #define min(a, b)       ((a) < (b) ? (a) : (b))
  29 #define max(a, b)       ((a) > (b) ? (a) : (b))
  30
  31 /*
  32  *      This routine writes win1 on win2 destructively.
  33  */
  34
  35 int
  36 overwrite(WINDOW *win1, WINDOW *win2)
  37 {
  38         int     x, y, endy, endx, starty, startx;
  39
  40 #ifdef DEBUG
  41         fprintf(outf, "OVERWRITE(%0.2o, %0.2o);\n", win1, win2);
  42 #endif
  43         starty = max(win1->_begy, win2->_begy);
  44         startx = max(win1->_begx, win2->_begx);
  45         endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begy);
  46         endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
  47         if (starty >= endy || startx >= endx)
  48                 return (OK);
  49 #ifdef DEBUG
  50         fprintf(outf, "OVERWRITE:from (%d,%d) to (%d,%d)\n",
  51             starty, startx, endy, endx);
  52 #endif
  53         x = endx - startx;
  54         for (y = starty; y < endy; y++) {
  55                 (void) memmove(&win2->_y[y - win2->_begy][startx - win2->_begx],
  56                     &win1->_y[y - win1->_begy][startx - win1->_begx], x);
  57                 (void) touchline(win2, y, startx - win2->_begx,
  58                     endx - win2->_begx);
  59         }
  60         return (OK);
  61 }