.\" Copyright (c) 2005 Pascal Gloor <pascal.gloor@spale.com>
.\"
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.\" $FreeBSD: head/lib/libc/string/memmem.3 152746 2005-11-24 06:56:21Z ru $
.\"
.Dd August 24, 2005
.Dt MEMMEM 3
.Os
.Sh NAME
.Nm memmem
.Nd "locate a byte substring in a byte string"
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In string.h
.Ft "void *"
.Fo memmem
.Fa "const void *big" "size_t big_len"
.Fa "const void *little" "size_t little_len"
.Fc
.Sh DESCRIPTION
The
.Fn memmem
function
locates the first occurrence of the byte string
.Fa little
in the byte string
.Fa big .
.Sh RETURN VALUES
If
.Fa big_len
is smaller than
.Fa little_len ,
if
.Fa little_len
is 0, if
.Fa big_len
is 0 or if
.Fa little
occurs nowhere in
.Fa big ,
.Dv NULL
is returned;
otherwise a pointer to the first character of the first occurrence of
.Fa little
is returned.
.Sh SEE ALSO
.Xr memchr 3 ,
.Xr strchr 3 ,
.Xr strstr 3
.Sh CONFORMING TO
.Fn memmem
is a GNU extension.
.Sh HISTORY
The
.Fn memmem
function first appeared in
.Fx 6.0 .
.Sh AUTHORS
.An Pascal Gloor Aq Mt pascal.gloor@spale.com
.Sh BUGS
This function was broken in Linux libc up to and including version 5.0.9
and in GNU libc prior to version 2.1.