string/FreeBSD/memcpy.3

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  32 .\"     @(#)memcpy.3    8.1 (Berkeley) 6/4/93
  33 .\" $FreeBSD: src/lib/libc/string/memcpy.3,v 1.9 2009/04/07 13:42:53 trasz Exp $
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  35 .Dd June 4, 1993
  36 .Dt MEMCPY 3
  37 .Os
  38 .Sh NAME
  39 .Nm memcpy
  40 .Nd copy memory area
  41 .Sh LIBRARY
  42 .Lb libc
  43 .Sh SYNOPSIS
  44 .In string.h
  45 .Ft void *
  46 .Fo memcpy
  47 .Fa "void *restrict dst"
  48 .Fa "const void *restrict src"
  49 .Fa "size_t n"
  50 .Fc
  51 .Sh DESCRIPTION
  52 The
  53 .Fn memcpy
  54 function
  55 copies
  56 .Fa n
  57 bytes from memory area
  58 .Fa src
  59 to memory area
  60 .Fa dst .
  61 If
  62 .Fa dst
  63 and
  64 .Fa src
  65 overlap, behavior is undefined.
  66 Applications in which
  67 .Fa dst
  68 and
  69 .Fa src
  70 might overlap should use
  71 .Xr memmove 3
  72 instead.
  73 .Sh RETURN VALUES
  74 The
  75 .Fn memcpy
  76 function
  77 returns the original value of
  78 .Fa dst .
  79 .Sh SEE ALSO
  80 .Xr bcopy 3 ,
  81 .Xr memccpy 3 ,
  82 .Xr memmove 3 ,
  83 .Xr strcpy 3 ,
  84 .Xr wmemcpy 3
  85 .Sh STANDARDS
  86 The
  87 .Fn memcpy
  88 function
  89 conforms to
  90 .St -isoC .