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Annotation of 41BSD/lib/libcurses/overlay.c, revision 1.1.1.1

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

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