diff -r a76af67a3a4b -r 7b156b764d11 pdcurses/touch.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pdcurses/touch.c	Sat Jan 09 17:41:21 2016 +0200
@@ -0,0 +1,160 @@
+/* Public Domain Curses */
+
+#include <curspriv.h>
+
+RCSID("$Id: touch.c,v 1.29 2008/07/13 16:08:18 wmcbrine Exp $")
+
+/*man-start**************************************************************
+
+  Name:                                                         touch
+
+  Synopsis:
+        int touchwin(WINDOW *win);
+        int touchline(WINDOW *win, int start, int count);
+        int untouchwin(WINDOW *win);
+        int wtouchln(WINDOW *win, int y, int n, int changed);
+        bool is_linetouched(WINDOW *win, int line);
+        bool is_wintouched(WINDOW *win);
+
+  Description:
+        touchwin() and touchline() throw away all information about 
+        which parts of the window have been touched, pretending that the 
+        entire window has been drawn on.  This is sometimes necessary 
+        when using overlapping windows, since a change to one window 
+        will affect the other window, but the records of which lines 
+        have been changed in the other window will not reflect the 
+        change.
+
+        untouchwin() marks all lines in the window as unchanged since 
+        the last call to wrefresh().
+
+        wtouchln() makes n lines in the window, starting at line y, look 
+        as if they have (changed == 1) or have not (changed == 0) been 
+        changed since the last call to wrefresh().
+
+        is_linetouched() returns TRUE if the specified line in the 
+        specified window has been changed since the last call to 
+        wrefresh().
+
+        is_wintouched() returns TRUE if the specified window 
+        has been changed since the last call to wrefresh().
+
+  Return Value:
+        All functions return OK on success and ERR on error except
+        is_wintouched() and is_linetouched().
+
+  Portability                                X/Open    BSD    SYS V
+        touchwin                                Y       Y       Y
+        touchline                               Y       -      3.0
+        untouchwin                              Y       -      4.0
+        wtouchln                                Y       Y       Y
+        is_linetouched                          Y       -      4.0
+        is_wintouched                           Y       -      4.0
+
+**man-end****************************************************************/
+
+int touchwin(WINDOW *win)
+{
+    int i;
+
+    PDC_LOG(("touchwin() - called: Win=%x\n", win));
+
+    if (!win)
+        return ERR;
+
+    for (i = 0; i < win->_maxy; i++)
+    {
+        win->_firstch[i] = 0;
+        win->_lastch[i] = win->_maxx - 1;
+    }
+
+    return OK;
+}
+
+int touchline(WINDOW *win, int start, int count)
+{
+    int i;
+
+    PDC_LOG(("touchline() - called: win=%p start %d count %d\n",
+             win, start, count));
+
+    if (!win || start > win->_maxy || start + count > win->_maxy)
+        return ERR;
+
+    for (i = start; i < start + count; i++)
+    {
+        win->_firstch[i] = 0;
+        win->_lastch[i] = win->_maxx - 1;
+    }
+
+    return OK;
+}
+
+int untouchwin(WINDOW *win)
+{
+    int i;
+
+    PDC_LOG(("untouchwin() - called: win=%p", win));
+
+    if (!win)
+        return ERR;
+
+    for (i = 0; i < win->_maxy; i++)
+    {
+        win->_firstch[i] = _NO_CHANGE;
+        win->_lastch[i] = _NO_CHANGE;
+    }
+
+    return OK;
+}
+
+int wtouchln(WINDOW *win, int y, int n, int changed)
+{
+    int i;
+
+    PDC_LOG(("wtouchln() - called: win=%p y=%d n=%d changed=%d\n",
+             win, y, n, changed));
+
+    if (!win || y > win->_maxy || y + n > win->_maxy)
+        return ERR;
+
+    for (i = y; i < y + n; i++)
+    {
+        if (changed)
+        {
+            win->_firstch[i] = 0;
+            win->_lastch[i] = win->_maxx - 1;
+        }
+        else 
+        {
+            win->_firstch[i] = _NO_CHANGE;
+            win->_lastch[i] = _NO_CHANGE;
+        }
+    }
+
+    return OK;
+}
+
+bool is_linetouched(WINDOW *win, int line)
+{
+    PDC_LOG(("is_linetouched() - called: win=%p line=%d\n", win, line));
+
+    if (!win || line > win->_maxy || line < 0)
+        return FALSE;
+
+    return (win->_firstch[line] != _NO_CHANGE) ? TRUE : FALSE;
+}
+
+bool is_wintouched(WINDOW *win)
+{
+    int i;
+
+    PDC_LOG(("is_wintouched() - called: win=%p\n", win));
+
+    if (win)
+        for (i = 0; i < win->_maxy; i++)
+            if (win->_firstch[i] != _NO_CHANGE)
+                return TRUE;
+
+    return FALSE;
+}