\" $NetBSD: memmem.3,v 1.4 2024/11/01 16:36:58 nia Exp $
\"
\" Copyright (c) 2005 The NetBSD Foundation, Inc.
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\" This code is derived from software contributed to The NetBSD Foundation
\" by Perry E. Metzger of Metzger, Dowdeswell & Co. LLC.
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Dd November 1, 2024
Dt MEMMEM 3
Os
Sh NAME
Nm memmem
Nd locate substring in byte string
Sh LIBRARY
Lb libc
Sh SYNOPSIS
In string.h
Ft void *
Fn memmem "const void *block" "size_t blen" "const void *pat" "size_t plen"
Sh DESCRIPTION
The
Fn memmem
function locates the first occurrence of the binary string
Fa pat
of size
Fa plen
bytes in the byte string
Fa block
of size
Fa blen
bytes.
Sh RETURN VALUES
The
Fn memmem
function returns a pointer to the substring located, or
Dv NULL
if no such substring exists within
Fa block .
Pp
If
Fa plen
is zero,
Fa block
is returned, i.e. a zero length
Fa pat
is deemed to match the start of the string, as with
Xr strstr 3 .
Sh SEE ALSO
Xr bm 3 ,
Xr memchr 3 ,
Xr strchr 3 ,
Xr strstr 3
Sh STANDARDS
The
Nm
function conforms to
St -p1003.1-2024 .
Sh HISTORY
Fn memmem
first appeared in the Free Software Foundation's glibc library.
