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Annotation of 43BSD/usr.lib/libcurses/overlay.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)overlay.c  5.2 (Berkeley) 2/12/86";
        !             9: #endif not lint
        !            10: 
        !            11: # include      "curses.ext"
        !            12: # include      <ctype.h>
        !            13: 
        !            14: # define       min(a,b)        (a < b ? a : b)
        !            15: # define       max(a,b)        (a > b ? a : b)
        !            16: 
        !            17: /*
        !            18:  *     This routine writes win1 on win2 non-destructively.
        !            19:  *
        !            20:  */
        !            21: overlay(win1, win2)
        !            22: reg WINDOW     *win1, *win2; {
        !            23: 
        !            24:        reg char        *sp, *end;
        !            25:        reg int         x, y, endy, endx, starty, startx;
        !            26:        reg int         y1,y2;
        !            27: 
        !            28: # ifdef DEBUG
        !            29:        fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
        !            30: # endif
        !            31:        starty = max(win1->_begy, win2->_begy);
        !            32:        startx = max(win1->_begx, win2->_begx);
        !            33:        endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begx);
        !            34:        endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
        !            35: # ifdef DEBUG
        !            36:        fprintf(outf, "OVERLAY:from (%d,%d) to (%d,%d)\n", starty, startx, endy, endx);
        !            37: # endif
        !            38:        if (starty >= endy || startx >= endx)
        !            39:                return;
        !            40:        x = endx - startx;
        !            41:        for (y = starty; y < endy; y++) {
        !            42:                bcopy(&win1->_y[y - win1->_begy][startx - win1->_begx],
        !            43:                      &win2->_y[y - win2->_begy][startx - win2->_begx], x);
        !            44:                touchline(win2, y, startx - win2->_begx, endx - win2->_begx);
        !            45:        }
        !            46:        y1 = starty - win1->_begy;
        !            47:        y2 = starty - win2->_begy;
        !            48:        for (y = starty; y < endy; y++, y1++, y2++) {
        !            49:                end = &win1->_y[y1][endx - win1->_begx];
        !            50:                x = startx - win2->_begx;
        !            51:                for (sp = &win1->_y[y1][startx - win1->_begx]; sp < end; sp++) {
        !            52:                        if (!isspace(*sp))
        !            53:                                mvwaddch(win2, y2, x, *sp);
        !            54:                        x++;
        !            55:                }
        !            56:        }
        !            57: }

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