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.\" Copyright (c) 2001 Kungliga Tekniska Högskolan
.\" (Royal Institute of Technology, Stockholm, Sweden).
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\"
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\"
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" 3. Neither the name of the Institute nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $Id: krb5_principal_get_realm.3,v 1.6 2003/04/16 13:58:17 lha Exp $
.\"
.Dd June 20, 2001
.Dt KRB5_PRINCIPAL_GET_REALM 3
.Os HEIMDAL
.Sh NAME
.Nm krb5_principal_get_realm ,
.Nm krb5_principal_get_comp_string
.Nd decompose a principal
.Sh LIBRARY
Kerberos 5 Library (libkrb5, -lkrb5)
.Sh SYNOPSIS
.In krb5.h
.Ft "const char *"
.Fn krb5_principal_get_realm "krb5_context context" "krb5_principal principal"
.Ft "const char *"
.Fn krb5_principal_get_comp_string "krb5_context context" "krb5_principal principal" "unsigned int component"
.Sh DESCRIPTION
These functions return parts of the
.Fa principal ,
either the realm or a specific component. The returned string points
to data inside the principal, so they are valid only as long as the
principal exists.
.Pp
The
.Fa component
argument to
.Fn krb5_principal_get_comp_string
is the component number to return, from zero to the total number of
components minus one. If a the requested component number is out of range,
.Dv NULL
is returned.
.Pp
These functions can be seen as a replacement for the
.Fn krb5_princ_realm ,
.Fn krb5_princ_component
and related macros, described as intermal in the MIT API
specification. A difference is that these functions return strings,
not
.Dv krb5_data .
A reason to return
.Dv krb5_data
was that it was believed that principal components could contain
binary data, but this belief was unfounded, and it has been decided
that principal components are infact UTF8, so it's safe to use zero
terminated strings.
.Pp
It's generally not necessary to look at the components of a principal.
.Sh SEE ALSO
.Xr krb5_unparse_name 3
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