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5.10 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.