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FreeBSD 11.0 - man page for memcpy (freebsd section 3)

MEMCPY(3)						   BSD Library Functions Manual 						 MEMCPY(3)

NAME
memcpy -- copy byte string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <string.h> void * memcpy(void *dst, const void *src, size_t len);
DESCRIPTION
The memcpy() function copies len bytes from string src to string dst.
RETURN VALUES
The memcpy() function returns the original value of dst.
SEE ALSO
bcopy(3), memccpy(3), memmove(3), strcpy(3), wmemcpy(3)
STANDARDS
The memcpy() function conforms to ISO/IEC 9899:1990 (``ISO C90'').
BUGS
In this implementation memcpy() is implemented using bcopy(3), and therefore the strings may overlap. On other systems, copying overlapping strings may produce surprises. Programs intended to be portable should use memmove(3) when src and dst may overlap.
BSD
June 4, 1993 BSD