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

BCOPY(3)						   BSD Library Functions Manual 						  BCOPY(3)

NAME
bcopy -- copy byte string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <strings.h> void bcopy(const void *src, void *dst, size_t len);
DESCRIPTION
The bcopy() function copies len bytes from string src to string dst. The two strings may overlap. If len is zero, no bytes are copied.
SEE ALSO
memccpy(3), memcpy(3), memmove(3), strcpy(3), strncpy(3)
HISTORY
A bcopy() function appeared in 4.2BSD. Its prototype existed previously in <string.h> before it was moved to <strings.h> for IEEE Std 1003.1-2001 (``POSIX.1'') compliance.
BSD
June 4, 1993 BSD