date and time created 81/01/26 17:03:06 by arnold

SCCS-vsn: lib/libcurses/overlay.c 1.1

diff --git a/usr/src/lib/libcurses/overlay.c b/usr/src/lib/libcurses/overlay.c
new file mode 100644 (file)
index 0000000..d49ac0c
--- /dev/null
+++ b/usr/src/lib/libcurses/overlay.c
@@ -0,0 +1,39 @@
+# include      "curses.h"
+# include      <ctype.h>
+
+# define       min(a,b)        (a < b ? a : b)
+# define       max(a,b)        (a < b ? a : b)
+
+/*
+ *     This routine writes win1 on win2 non-destructively.
+ *
+ * %G% (Berkeley) @(#)overlay.c        1.1
+ */
+overlay(win1, win2)
+reg WINDOW     *win1, *win2; {
+
+       reg char        *sp, *end;
+       reg int         x, y, endy, endx, starty, startx, y_top,
+                       y_bot, x_left, x_right;
+
+# ifdef DEBUG
+       fprintf(outf, "OVERLAY(%0.2o, %0.2o);\n", win1, win2);
+# endif
+       y_top = max(win1->_begy, win2->_begy);
+       y_bot = min(win1->_maxy, win2->_maxy);
+       x_left = max(win1->_begx, win2->_begx);
+       x_right = min(win1->_maxx, win2->_maxx);
+       starty = y_top - win1->_begy;
+       startx = x_left - win1->_begx;
+       endy = y_bot - win1->_begy;
+       endx = x_right - win1->_begx;
+       for (y = starty; y < endy; y++) {
+               end = &win1->_y[y][endx];
+               x = startx + win1->_begx;
+               for (sp = &win1->_y[y][startx]; sp <= end; sp++) {
+                       if (!isspace(*sp))
+                               mvwaddch(win2, y + win1->_begy, x, *sp);
+                       x++;
+               }
+       }
+}