Adjust directory structure

Ubiquitous/XiUOS/lib/newlib/mem_syscalls.c

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+
+/**
+* @file mem_syscalls.c
+* @brief support newlib memory
+* @version 1.0 
+* @author AIIT XUOS Lab
+* @date 2020-09-23
+*/
+
+/*************************************************
+File name: mem_syscalls.c
+Description: support newlib memory
+Others: take RT-Thread v4.0.2/components/libc/compilers/newlib/syscalls.c for references
+                https://github.com/RT-Thread/rt-thread/tree/v4.0.2
+History: 
+1. Date: 2020-09-23
+Author: AIIT XUOS Lab
+Modification: Use malloc, realloc, calloc and free functions
+*************************************************/
+
+#include <xiuos.h>
+
+void *_malloc_r (struct _reent *ptr, size_t size)
+{
+    void* result = (void*)x_malloc(size);
+
+    if (result == NONE)
+    {
+        ptr->_errno = ENOMEM;
+    }
+
+    return result;
+}
+
+void *_realloc_r (struct _reent *ptr, void *old, size_t newlen)
+{
+    void* result = (void*)x_realloc(old, newlen);
+
+    if (result == NONE)
+    {
+        ptr->_errno = ENOMEM;
+    }
+
+    return result;
+}
+
+void *_calloc_r (struct _reent *ptr, size_t size, size_t len)
+{
+    void* result = (void*)x_calloc(size, len);
+
+    if (result == NONE)
+    {
+        ptr->_errno = ENOMEM;
+    }
+
+    return result;
+}
+
+void _free_r (struct _reent *ptr, void *address)
+{
+    x_free (address);
+}