.\" 	$OpenBSD: isduid.3,v 1.4 2022/03/31 17:27:18 naddy Exp $
.\"
.\" * Copyright (c) Joel Sing <jsing@openbsd.org>
.\"
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.Dd $Mdocdate: March 31 2022 $
.Dt ISDUID 3
.Os
.Sh NAME
.Nm isduid
.Nd disklabel UID test
.Sh SYNOPSIS
.In util.h
.Ft int
.Fn isduid "char *duid" "int dflags"
.Sh DESCRIPTION
The
.Fn isduid
function tests the string
.Fa duid
to see if it is a valid
.Xr disklabel 8
UID.
The
.Fa dflags
are specified using the same flags as used by
.Xr opendev 3 .
.Pp
If the OPENDEV_PART flag is included in
.Fa dflags ,
the disklabel UID must consist of a 16-character hexadecimal string.
Otherwise the disklabel UID must consist of a 16-character hexadecimal string
followed by a
.Sq \&.
and a partition letter.
.Sh RETURN VALUES
The
.Fn isduid
function returns non-zero if
.Fa duid
is a valid DUID, otherwise zero is returned.
.Sh SEE ALSO
.Xr opendev 3 ,
.Xr disklabel 5 ,
.Xr disklabel 8
.Sh HISTORY
The
.Fn isduid
function first appeared in
.Ox 4.9 .