Added gf-lexing.* to c-bindings.

contrib/c-bindings/gf_lexing.h

@@ -0,0 +1,26 @@
+/* GF C Bindings
+   Copyright (C) 2010 Kevin Kofler
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   This library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with this library; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+/* Function pointer type which applies a string operation to str, which is
+   assumed to be non-NULL.
+   The resulting string can be assumed to be non-NULL and must be freed using
+   free. */
+typedef char *(*GF_StringOp)(const char *str);
+
+/* Returns a GF_StringOp applying the operation op if available, otherwise
+   NULL. op is assumed to be non-NULL. The GF_StringOp MUST NOT be freed. */
+GF_StringOp gf_stringOp(const char *op);