| | 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 and the American National Standards Committee X3, |
| | 6 | .\" on Information Processing Systems. |
| | 7 | .\" |
| | 8 | .\" Redistribution and use in source and binary forms, with or without |
| | 9 | .\" modification, are permitted provided that the following conditions |
| | 10 | .\" are met: |
| | 11 | .\" 1. Redistributions of source code must retain the above copyright |
| | 12 | .\" notice, this list of conditions and the following disclaimer. |
| | 13 | .\" 2. Redistributions in binary form must reproduce the above copyright |
| | 14 | .\" notice, this list of conditions and the following disclaimer in the |
| | 15 | .\" documentation and/or other materials provided with the distribution. |
| | 16 | .\" 3. Neither the name of the University nor the names of its contributors |
| | 17 | .\" may be used to endorse or promote products derived from this software |
| | 18 | .\" without specific prior written permission. |
| | 19 | .\" |
| | 20 | .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 21 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 22 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 23 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 24 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 25 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 26 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 27 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 28 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 29 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 30 | .\" SUCH DAMAGE. |
| | 31 | .\" |
| | 32 | .\" @(#)memcpy.3 8.1 (Berkeley) 6/4/93 |
| | 33 | .\" $FreeBSD: head/lib/libc/string/memcpy.3 251069 2013-05-28 20:57:40Z emaste $ |
| | 34 | .\" |
| | 35 | .Dd February 22, 2018 |
| | 36 | .Dt MEMCPY 3 |
| | 37 | .Os |
| | 38 | .Sh NAME |
| | 39 | .Nm memcpy |
| | 40 | .Nd copy byte string |
| | 41 | .Sh LIBRARY |
| | 42 | .Lb libc |
| | 43 | .Sh SYNOPSIS |
| | 44 | .In string.h |
| | 45 | .Ft void * |
| | 46 | .Fn memcpy "void * restrict dst" "const void * restrict src" "size_t len" |
| | 47 | .Ft void * |
| | 48 | .Fn mempcpy "void *dst" "const void *src" "size_t len" |
| | 49 | .Sh DESCRIPTION |
| | 50 | The |
| | 51 | .Fn memcpy |
| | 52 | and |
| | 53 | .Fn mempcpy |
| | 54 | functions |
| | 55 | copy |
| | 56 | .Fa len |
| | 57 | bytes from string |
| | 58 | .Fa src |
| | 59 | to string |
| | 60 | .Fa dst . |
| | 61 | .Sh RETURN VALUES |
| | 62 | The |
| | 63 | .Fn memcpy |
| | 64 | function |
| | 65 | returns the original value of |
| | 66 | .Fa dst . |
| | 67 | The |
| | 68 | .Fn mempcpy |
| | 69 | function |
| | 70 | returns a pointer to the byte directly following the last byte written in |
| | 71 | .Fa dst . |
| | 72 | .Sh SEE ALSO |
| | 73 | .Xr bcopy 3 , |
| | 74 | .Xr memccpy 3 , |
| | 75 | .Xr memmove 3 , |
| | 76 | .Xr strcpy 3 , |
| | 77 | .Xr wmemcpy 3 |
| | 78 | .Sh STANDARDS |
| | 79 | The |
| | 80 | .Fn memcpy |
| | 81 | function |
| | 82 | conforms to |
| | 83 | .St -isoC . |
| | 84 | .Sh BUGS |
| | 85 | In this implementation |
| | 86 | .Fn memcpy |
| | 87 | is implemented using |
| | 88 | .Xr bcopy 3 , |
| | 89 | and therefore the strings may overlap. |
| | 90 | On other systems, copying overlapping strings may produce surprises. |
| | 91 | Programs intended to be portable should use |
| | 92 | .Xr memmove 3 |
| | 93 | when |
| | 94 | .Fa src |
| | 95 | and |
| | 96 | .Fa dst |
| | 97 | may overlap. |
projects / dragonfly.git / blame_incremental