1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)bcopy.3 8.1 (Berkeley) 6/4/93 32.\" 33.Dd August 24, 2015 34.Dt BCOPY 3 35.Os 36.Sh NAME 37.Nm bcopy 38.Nd copy byte string 39.Sh LIBRARY 40.Lb libc 41.Sh SYNOPSIS 42.In strings.h 43.Ft void 44.Fn bcopy "const void *src" "void *dst" "size_t len" 45.Sh DESCRIPTION 46The 47.Fn bcopy 48function 49copies 50.Fa len 51bytes from string 52.Fa src 53to string 54.Fa dst . 55The two strings may overlap. 56If 57.Fa len 58is zero, no bytes are copied. 59.Sh SEE ALSO 60.Xr memccpy 3 , 61.Xr memcpy 3 , 62.Xr memmove 3 , 63.Xr strcpy 3 , 64.Xr strncpy 3 65.Sh HISTORY 66A 67.Fn bcopy 68function appeared in 69.Bx 4.2 . 70Its prototype existed previously in 71.In string.h 72before it was moved to 73.In strings.h 74for 75.St -p1003.1-2001 76compliance. 77.Pp 78.St -p1003.1-2008 79removes the specification of 80.Fn bcopy 81and it is marked as LEGACY in 82.St -p1003.1-2004 . 83New programs should use 84.Xr memmove 3 . 85If the input and output buffer do not overlap, then 86.Xr memcpy 3 87is more efficient. 88Note that 89.Fn bcopy 90takes 91.Ar src 92and 93.Ar dst 94in the opposite order from 95.Fn memmove 96and 97.Fn memcpy . 98