diff -r 5314ebdcb38d -r 2d43f05b284c pdcurses/beep.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pdcurses/beep.c	Thu Jul 23 18:07:39 2015 +0300
@@ -0,0 +1,65 @@
+/* Public Domain Curses */
+
+#include <curspriv.h>
+
+RCSID("$Id: beep.c,v 1.34 2008/07/13 16:08:17 wmcbrine Exp $")
+
+/*man-start**************************************************************
+
+  Name:                                                         beep
+
+  Synopsis:
+        int beep(void);
+        int flash(void);
+
+  Description:
+        beep() sounds the audible bell on the terminal, if possible;
+        if not, it calls flash().
+
+        flash() "flashes" the screen, by inverting the foreground and
+        background of every cell, pausing, and then restoring the
+        original attributes.
+
+  Return Value:
+        These functions return OK.
+
+  Portability                                X/Open    BSD    SYS V
+        beep                                    Y       Y       Y
+        flash                                   Y       Y       Y
+
+**man-end****************************************************************/
+
+int beep(void)
+{
+    PDC_LOG(("beep() - called\n"));
+
+    if (SP->audible)
+        PDC_beep();
+    else
+        flash();
+
+    return OK;
+}
+
+int flash(void)
+{
+    int z, y, x;
+
+    PDC_LOG(("flash() - called\n"));
+
+    /* Reverse each cell; wait; restore the screen */
+
+    for (z = 0; z < 2; z++)
+    {
+        for (y = 0; y < LINES; y++)
+            for (x = 0; x < COLS; x++)
+                curscr->_y[y][x] ^= A_REVERSE;
+
+        wrefresh(curscr);
+
+        if (!z)
+            napms(50);
+    }
+
+    return OK;
+}