systemd/man/sd_bus_label_escape.xml

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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

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<refentry id="sd_bus_label_escape">

  <refentryinfo>
    <title>sd_bus_label_escape</title>
    <productname>systemd</productname>

    <authorgroup>
      <author>
        <contrib>A monkey with a typewriter</contrib>
        <firstname>Zbigniew</firstname>
        <surname>Jędrzejewski-Szmek</surname>
        <email>zbyszek@in.waw.pl</email>
      </author>
    </authorgroup>
  </refentryinfo>

  <refmeta>
    <refentrytitle>sd_bus_label_escape</refentrytitle>
    <manvolnum>3</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>sd_bus_label_escape</refname>
    <refname>sd_bus_label_unescape</refname>

    <refpurpose>Escape D-Bus object path special characters</refpurpose>
  </refnamediv>

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

      <funcprototype>
        <funcdef>char* <function>sd_bus_label_escape</function></funcdef>
        <paramdef>const char* <parameter>s</parameter></paramdef>
      </funcprototype>

      <funcprototype>
        <funcdef>char* <function>sd_bus_label_unescape</function></funcdef>
        <paramdef>const char* <parameter>f</parameter></paramdef>
      </funcprototype>
    </funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para><function>sd_bus_label_escape()</function> takes a
    <constant>NUL</constant>-terminated string as a argument. It will
    replace all characters which are invalid in a D-Bus object path by
    <literal>_</literal> and a hexadecimal number. As a special case,
    the empty string will be replaced by a lone <literal>_</literal>.
    <function>sd_bus_label_unescape()</function> can be used to
    reverse this process.</para>
  </refsect1>

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

    <para>On success, a new <constant>NUL</constant>-terminated string
    will be returned. It must be
    <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>d
    by the caller. If a memory allocation failure occurs,
    <constant>NULL</constant> will be returned.
    </para>
  </refsect1>

  <refsect1>
    <title>Notes</title>

    <para><function>sd_bus_label_escape()</function> and
    <function>sd_bus_label_unescape()</function> are available as a
    shared library, which can be compiled and linked to with the
    <constant>libsystemd</constant> <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-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
    </para>
  </refsect1>

</refentry>