1956385a7d
Provide a way to only customize specific string operations, such as for memcpy with the DMA capability by ROM. Signed-off-by: yangdongdong <yangdongdong@xiaomi.com>
67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/****************************************************************************
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* libs/libc/string/lib_memmove.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <string.h>
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#include "libc.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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#if !defined(CONFIG_LIBC_ARCH_MEMMOVE) && defined(LIBC_BUILD_MEMMOVE)
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#undef memmove /* See mm/README.txt */
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no_builtin("memmove")
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FAR void *memmove(FAR void *dest, FAR const void *src, size_t count)
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{
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FAR char *tmp;
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FAR char *s;
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if (dest <= src)
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{
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tmp = (FAR char *) dest;
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s = (FAR char *) src;
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while (count--)
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{
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*tmp++ = *s++;
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}
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}
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else
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{
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tmp = (FAR char *) dest + count;
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s = (FAR char *) src + count;
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while (count--)
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{
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*--tmp = *--s;
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}
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}
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return dest;
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}
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#endif
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