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5.8 memcpy—copy memory regions

Synopsis 

     #include <string.h>
     void* memcpy(void *restrict out, const void *restrict in,
         size_t n);

Description
This function copies n bytes from the memory region pointed to by in to the memory region pointed to by out.

If the regions overlap, the behavior is undefined.
Returns
memcpy returns a pointer to the first byte of the out region.
Portability
memcpy is ANSI C.

memcpy requires no supporting OS subroutines.