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Annotation of researchv10no/ncurses/screen/overlay.c, revision 1.1

1.1     ! root        1: # include      "curses.ext"
        !             2: # include      <ctype.h>
        !             3: /*     @(#) overlay.c: 1.1 10/15/83    (1.3    5/23/82)        */
        !             4: 
        !             5: # define       min(a,b)        (a < b ? a : b)
        !             6: # define       max(a,b)        (a > b ? a : b)
        !             7: 
        !             8: /*
        !             9:  *     This routine writes win1 on win2 non-destructively.
        !            10:  *
        !            11:  * 1/26/81 (Berkeley) @(#)overlay.c    1.1
        !            12:  */
        !            13: overlay(win1, win2)
        !            14: reg WINDOW     *win1, *win2; {
        !            15: 
        !            16:        reg chtype      *sp, *end;
        !            17:        reg int         x, y, endy, endx, starty, startx, y_top,
        !            18:                        y_bot, x_left, x_right;
        !            19: 
        !            20: # ifdef DEBUG
        !            21:        if(outf) fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
        !            22: # endif
        !            23:        y_top = max(win1->_begy, win2->_begy);
        !            24:        y_bot = min(win1->_maxy, win2->_maxy);
        !            25:        x_left = max(win1->_begx, win2->_begx);
        !            26:        x_right = min(win1->_maxx, win2->_maxx);
        !            27:        starty = y_top - win1->_begy;
        !            28:        startx = x_left - win1->_begx;
        !            29:        endy = y_bot - win1->_begy;
        !            30:        endx = x_right - win1->_begx;
        !            31:        for (y = starty; y < endy; y++) {
        !            32:                end = &win1->_y[y][endx];
        !            33:                x = startx + win1->_begx;
        !            34:                for (sp = &win1->_y[y][startx]; sp < end; sp++) {
        !            35:                        if (!isspace(*sp))
        !            36:                                mvwaddch(win2, y + win1->_begy, x, *sp);
        !            37:                        x++;
        !            38:                }
        !            39:        }
        !            40: }

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