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-<?xml version='1.0'?> <!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2012 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="sd_id128_to_string">
-
- <refentryinfo>
- <title>sd_id128_to_string</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>sd_id128_to_string</refentrytitle>
- <manvolnum>3</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>sd_id128_to_string</refname>
- <refname>sd_id128_from_string</refname>
- <refpurpose>Format or parse 128 bit IDs as strings</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include &lt;systemd/sd-id128.h&gt;</funcsynopsisinfo>
-
- <funcprototype>
- <funcdef>char* <function>sd_id128_to_string</function></funcdef>
- <paramdef>sd_id128_t <parameter>id</parameter>, char <parameter>s</parameter>[33]</paramdef>
- </funcprototype>
-
- <funcprototype>
- <funcdef>int <function>sd_id128_from_string</function></funcdef>
- <paramdef>const char <parameter>s</parameter>[33], sd_id128_t* <parameter>ret</parameter></paramdef>
- </funcprototype>
-
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><function>sd_id128_to_string()</function>
- formats a 128 bit ID as character string. It expects
- the ID and a string array capable of storing 33
- characters. The ID will be formatted as 32 lowercase
- hexadecimal digits and be terminated by a NUL
- byte.</para>
-
- <para><function>sd_id128_from_string()</function>
- implements the reverse operation: it takes a 33
- character array with 32 hexadecimal digits
- (terminated by NUL) and parses them back into an
- 128 bit ID returned in
- <parameter>ret</parameter>.</para>
-
- <para>For more information about the
- <literal>sd_id128_t</literal> type see
- <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
-
- <para>When formatting a 128 bit ID into a string it is
- often easier to use a format string for
- <citerefentry><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>. This
- is easily done using the
- <function>SD_ID128_FORMAT_STR</function> and
- <function>SD_ID128_FORMAT_VAL()</function> macros. For
- more information see
- <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para><function>sd_id128_to_string()</function> always
- succeeds and returns a pointer to the string array
- passed in. <function>sd_id128_from_string</function>
- returns 0 on success (in which case
- <parameter>ret</parameter> is filled in), or a negative
- errno-style error code.</para>
- </refsect1>
-
- <refsect1>
- <title>Notes</title>
-
- <para>The <function>sd_id128_to_string()</function>
- and <function>sd_id128_from_string()</function> interfaces are
- available as shared library, which can be compiled and
- linked to with the <literal>libsystemd-id128</literal>
- <citerefentry><refentrytitle>pkg-config</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- file.</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
-
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>sd-id128</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>printf</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>