--- gforth/test/libcc.fs	2007/06/01 17:38:13	1.4
+++ gforth/test/libcc.fs	2007/12/31 18:40:26	1.7
@@ -1,3 +1,22 @@
+\ test libcc.fs C interface
+
+\ Copyright (C) 2007 Free Software Foundation, Inc.
+
+\ This file is part of Gforth.
+
+\ Gforth is free software; you can redistribute it and/or
+\ modify it under the terms of the GNU General Public License
+\ as published by the Free Software Foundation, either version 3
+\ of the License, or (at your option) any later version.
+
+\ This program is distributed in the hope that it will be useful,
+\ but WITHOUT ANY WARRANTY; without even the implied warranty of
+\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+\ GNU General Public License for more details.
+
+\ You should have received a copy of the GNU General Public License
+\ along with this program. If not, see http://www.gnu.org/licenses/.
+
 require libcc.fs
 
 \c #include <string.h>
@@ -30,3 +49,18 @@ s\" ull=%llu r=%f\n\0" drop -1 -0.5e pri
 c-function printfll printfll a n -- n
 s\" ll=%lld\n\0" drop -1 printfll . cr
 s\" ll=%lld r=%f\n\0" drop -1 -0.5e printf-nr . cr
+
+\ test calling a C function pointer from Forth
+
+\ first create a C function pointer:
+
+\c typedef long (* func1)(long);
+\c #define labsptr(dummy) ((func1)labs)
+c-function labsptr labsptr -- a
+
+\ now the call
+\c #define call_func1(par1,fptr) ((func1)fptr)(par1)
+c-function call_func1 call_func1 n func -- n
+
+-5 labsptr call_func1 . cr
+