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memmove---move possibly overlapping memory

Synopsis 
#include <string.h>
void *memmove(void *dst, const void *src, size_t length);
Description
This function moves length characters from the block of memory starting at *src to the memory starting at *dst. memmove reproduces the characters correctly at *dst even if the two areas overlap.


Returns
The function returns dst as passed.


Portability
memmove is ANSI C.

memmove requires no supporting OS subroutines.


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