libc: add Libc::Allocator that uses malloc/free

repos/libports/include/libc/allocator.h

@@ -0,0 +1,43 @@
+/*
+ * \brief  Genode::Allocator that uses the libc's global heap
+ * \author Norman Feske
+ * \date   2017-01-31
+ */
+
+/*
+ * Copyright (C) 2017 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _INCLUDE__LIBC__ALLOCATOR_H_
+#define _INCLUDE__LIBC__ALLOCATOR_H_
+
+/* Genode includes */
+#include <base/allocator.h>
+
+/* libc includes */
+#include <stdlib.h>
+
+namespace Libc { struct Allocator; }
+
+
+struct Libc::Allocator : Genode::Allocator
+{
+	typedef Genode::size_t size_t;
+
+	bool alloc(size_t size, void **out_addr) override
+	{
+		*out_addr = malloc(size);
+		return true;
+	}
+
+	void free(void *addr, size_t size) override { ::free(addr); }
+
+	bool need_size_for_free() const override { return false; }
+
+	size_t overhead(size_t size) const override { return 0; }
+};
+
+#endif /* _INCLUDE__LIBC__ALLOCATOR_H_ */