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doc: memcpy文档
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  可变参数
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### 内存操作
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#### `void *memcpy(void *dst, const void *src, uint64_t size)`
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##### 描述
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  将内存从src处拷贝到dst处。
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##### 参数
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**dst**
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  指向目标地址的指针
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**src**
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  指向源地址的指针
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**size**
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  待拷贝的数据大小
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#### `void *memmove(void *dst, const void *src, uint64_t size)`
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##### 描述
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  与`memcpy()`类似,但是在源数据区域与目标数据区域之间存在重合时,该函数能防止数据被错误的覆盖。
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##### 参数
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**dst**
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  指向目标地址的指针
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**src**
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  指向源地址的指针
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**size**
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  待拷贝的数据大小
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