string/FreeBSD/memmem.3

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  27 .\" $FreeBSD: src/lib/libc/string/memmem.3,v 1.3 2005/11/24 06:56:21 ru Exp $
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  29 .Dd August 24, 2005
  30 .Dt MEMMEM 3
  31 .Os
  32 .Sh NAME
  33 .Nm memmem
  34 .Nd "locate a byte substring in a byte string"
  35 .Sh LIBRARY
  36 .Lb libc
  37 .Sh SYNOPSIS
  38 .In string.h
  39 .Ft "void *"
  40 .Fo memmem
  41 .Fa "const void *big" "size_t big_len"
  42 .Fa "const void *little" "size_t little_len"
  43 .Fc
  44 .Sh DESCRIPTION
  45 The
  46 .Fn memmem
  47 function
  48 locates the first occurrence of the byte string
  49 .Fa little
  50 in the byte string
  51 .Fa big .
  52 .Sh RETURN VALUES
  53 If
  54 .Fa big_len
  55 is smaller than
  56 .Fa little_len ,
  57 if
  58 .Fa little_len
  59 is 0, if
  60 .Fa big_len
  61 is 0 or if
  62 .Fa little
  63 occurs nowhere in
  64 .Fa big ,
  65 .Dv NULL
  66 is returned;
  67 otherwise a pointer to the first character of the first occurrence of
  68 .Fa little
  69 is returned.
  70 .Sh SEE ALSO
  71 .Xr memchr 3 ,
  72 .Xr strchr 3 ,
  73 .Xr strstr 3
  74 .Sh CONFORMING TO
  75 .Fn memmem
  76 is a GNU extension.
  77 .Sh HISTORY
  78 The
  79 .Fn memmem
  80 function first appeared in
  81 .Fx 6.0 .
  82 .Sh AUTHORS
  83 .An Pascal Gloor Aq pascal.gloor@spale.com
  84 .Sh BUGS
  85 This function was broken in Linux libc up to and including version 5.0.9
  86 and in GNU libc prior to version 2.1.