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.

IEEE Std 1003.1-2008 (“POSIX.1”) removes the specification of bcopy() and it is marked as LEGACY in IEEE Std 1003.1-2004 (“POSIX.1”). New programs should use memmove(3). If the input and output buffer do not overlap, then memcpy(3) is more efficient. Note that bcopy() takes src and dst in the opposite order from memmove() and memcpy().