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<refentry id="sd_journal_get_catalog">

        <refentryinfo>
                <title>sd_journal_get_catalog</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_journal_get_catalog</refentrytitle>
                <manvolnum>3</manvolnum>
        </refmeta>

        <refnamediv>
                <refname>sd_journal_get_catalog</refname>
                <refname>sd_journal_get_catalog_for_message_id</refname>
                <refpurpose>Retrieve message catalog entry</refpurpose>
        </refnamediv>

        <refsynopsisdiv>
                <funcsynopsis>
                        <funcsynopsisinfo>#include &lt;systemd/sd-journal.h&gt;</funcsynopsisinfo>

                        <funcprototype>
                                <funcdef>int <function>sd_journal_get_catalog</function></funcdef>
                                <paramdef>sd_journal *<parameter>j</parameter></paramdef>
                                <paramdef>char **<parameter>ret</parameter></paramdef>
                        </funcprototype>

                        <funcprototype>
                                <funcdef>int <function>sd_journal_get_catalog_for_message_id</function></funcdef>
                                <paramdef>sd_id128_t <parameter>id</parameter></paramdef>
                                <paramdef>char **<parameter>ret</parameter></paramdef>
                        </funcprototype>


                </funcsynopsis>
        </refsynopsisdiv>

        <refsect1>
                <title>Description</title>

                <para><function>sd_journal_get_catalog()</function>
                retrieves a message catalog entry for the current
                journal entry. This will look up an entry in the
                message catalog by using the
                <literal>MESSAGE_ID=</literal> field of the current
                journal entry. Before returning the entry all journal
                field names in the catalog entry text enclosed in "@"
                will be replaced by the respective field values of the
                current entry. If a field name referenced in the
                message catalog entry does not exist, in the current
                journal entry, the "@" will be removed, but the field
                name otherwise left untouched.</para>

                <para><function>sd_journal_get_catalog_for_message_id()</function>
                works similar to
                <function>sd_journal_get_catalog()</function> but the
                entry is looked up by the specified message ID (no
                open journal context is necessary for this), and no
                field substitution is performed.</para>

                <para>For more information about the journal message
                catalog please refer to the <ulink
                url="http://www.freedesktop.org/wiki/Software/systemd/catalog">Journal
                Message Catalogs</ulink> documentation page.</para>
        </refsect1>

        <refsect1>
                <title>Return Value</title>

                <para><function>sd_journal_get_catalog()</function>
                and
                <function>sd_journal_get_catalog_for_message_id()</function>
                return 0 on success or a negative errno-style error
                code. If no matching message catalog entry is found,
                -ENOENT is returned.</para>

                <para>On successful return, <parameter>ret</parameter>
                points to a new string, which must be freed with
                <citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
                </para>
        </refsect1>

        <refsect1>
                <title>Notes</title>

                <para>The <function>sd_journal_get_catalog()</function> and
                <function>sd_journal_get_catalog_for_message_id()</function>
                interfaces are available as a shared library, which can
                be compiled and linked to with the
                <constant>libsystemd</constant> <citerefentry project='die-net'><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>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>sd_journal_open</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>sd_journal_next</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>sd_journal_get_data</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
                        <citerefentry><refentrytitle>malloc</refentrytitle><manvolnum>3</manvolnum></citerefentry>
                </para>
        </refsect1>

</refentry>
