libs/libc: add obstack

libs/libc/obstack/lib_obstack_init.c

@@ -0,0 +1,53 @@
+/****************************************************************************
+ * libs/libc/obstack/lib_obstack_init.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <obstack.h>
+#include <stdio.h>
+#include <assert.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: obstack_init
+ *
+ * Description:
+ *   Initialize obstack for allocation of objects.
+ *   Compared to the GlibC version this won't initialize a first chunk.
+ *
+ * Input Parameters:
+ *   h: pointer to the handle to initialize
+ *
+ ****************************************************************************/
+
+void obstack_init(FAR struct obstack *h)
+{
+  DEBUGASSERT(h != NULL);
+
+  h->chunk_size = BUFSIZ;
+  h->chunk = NULL;
+  h->object_base = NULL;
+  h->next_free = NULL;
+}