mirror of
https://github.com/systemd/systemd
synced 2024-11-05 18:25:39 +00:00
3a54a15760
The "include" files had type "book" for some raeason. I don't think this is meaningful. Let's just use the same everywhere. $ perl -i -0pe 's^..DOCTYPE (book|refentry) PUBLIC "-//OASIS//DTD DocBook XML V4.[25]//EN"\s+"http^<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"\n "http^gms' man/*.xml
153 lines
6.7 KiB
XML
153 lines
6.7 KiB
XML
<?xml version='1.0'?>
|
||
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
||
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
||
<!-- SPDX-License-Identifier: LGPL-2.1+ -->
|
||
|
||
<refentry id="sd_bus_path_encode" xmlns:xi="http://www.w3.org/2001/XInclude">
|
||
|
||
<refentryinfo>
|
||
<title>sd_bus_path_encode</title>
|
||
<productname>systemd</productname>
|
||
</refentryinfo>
|
||
|
||
<refmeta>
|
||
<refentrytitle>sd_bus_path_encode</refentrytitle>
|
||
<manvolnum>3</manvolnum>
|
||
</refmeta>
|
||
|
||
<refnamediv>
|
||
<refname>sd_bus_path_encode</refname>
|
||
<refname>sd_bus_path_encode_many</refname>
|
||
<refname>sd_bus_path_decode</refname>
|
||
<refname>sd_bus_path_decode_many</refname>
|
||
|
||
<refpurpose>Convert an external identifier into an object path and back</refpurpose>
|
||
</refnamediv>
|
||
|
||
<refsynopsisdiv>
|
||
<funcsynopsis>
|
||
<funcsynopsisinfo>#include <systemd/sd-bus.h></funcsynopsisinfo>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_bus_path_encode</function></funcdef>
|
||
<paramdef>const char *<parameter>prefix</parameter></paramdef>
|
||
<paramdef>const char *<parameter>external_id</parameter></paramdef>
|
||
<paramdef>char **<parameter>ret_path</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_bus_path_encode_many</function></funcdef>
|
||
<paramdef>char **<parameter>out</parameter></paramdef>
|
||
<paramdef>const char *<parameter>path_template</parameter></paramdef>
|
||
<paramdef>…</paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_bus_path_decode</function></funcdef>
|
||
<paramdef>const char *<parameter>path</parameter></paramdef>
|
||
<paramdef>const char *<parameter>prefix</parameter></paramdef>
|
||
<paramdef>char **<parameter>ret_external_id</parameter></paramdef>
|
||
</funcprototype>
|
||
|
||
<funcprototype>
|
||
<funcdef>int <function>sd_bus_path_decode_many</function></funcdef>
|
||
<paramdef>const char *<parameter>path</parameter></paramdef>
|
||
<paramdef>const char *<parameter>path_template</parameter></paramdef>
|
||
<paramdef>…</paramdef>
|
||
</funcprototype>
|
||
</funcsynopsis>
|
||
</refsynopsisdiv>
|
||
|
||
<refsect1>
|
||
<title>Description</title>
|
||
|
||
<para><function>sd_bus_path_encode()</function> and
|
||
<function>sd_bus_path_decode()</function> convert external
|
||
identifier strings into object paths and back. These functions are
|
||
useful to map application-specific string identifiers of any kind
|
||
into bus object paths in a simple, reversible and safe way.</para>
|
||
|
||
<para><function>sd_bus_path_encode()</function> takes a bus path
|
||
prefix and an external identifier string as arguments, plus a
|
||
place to store the returned bus path string. The bus path prefix
|
||
must be a valid bus path, starting with a slash
|
||
<literal>/</literal>, and not ending in one. The external
|
||
identifier string may be in any format, may be the empty string,
|
||
and has no restrictions on the charset — however, it must
|
||
always be <constant>NUL</constant>-terminated. The returned string
|
||
will be the concatenation of the bus path prefix plus an escaped
|
||
version of the external identifier string. This operation may be
|
||
reversed with <function>sd_bus_path_decode()</function>. It is
|
||
recommended to only use external identifiers that generally
|
||
require little escaping to be turned into valid bus path
|
||
identifiers (for example, by sticking to a 7-bit ASCII character
|
||
set), in order to ensure the resulting bus path is still short and
|
||
easily processed.</para>
|
||
|
||
<para><function>sd_bus_path_decode()</function> reverses the
|
||
operation of <function>sd_bus_path_encode()</function> and thus
|
||
regenerates an external identifier string from a bus path. It
|
||
takes a bus path and a prefix string, plus a place to store the
|
||
returned external identifier string. If the bus path does not
|
||
start with the specified prefix, 0 is returned and the returned
|
||
string is set to <constant>NULL</constant>. Otherwise, the
|
||
string following the prefix is unescaped and returned in the
|
||
external identifier string.</para>
|
||
|
||
<para>The escaping used will replace all characters which are
|
||
invalid in a bus object path by <literal>_</literal>, followed by a
|
||
hexadecimal value. As a special case, the empty string will be
|
||
replaced by a lone <literal>_</literal>.</para>
|
||
|
||
<para><function>sd_bus_path_encode_many()</function> works like
|
||
its counterpart <function>sd_bus_path_encode()</function>, but
|
||
takes a path template as argument and encodes multiple labels
|
||
according to its embedded directives. For each
|
||
<literal>%</literal> character found in the template, the caller
|
||
must provide a string via varargs, which will be encoded and
|
||
embedded at the position of the <literal>%</literal> character.
|
||
Any other character in the template is copied verbatim into the
|
||
encoded path.</para>
|
||
|
||
<para><function>sd_bus_path_decode_many()</function> does the
|
||
reverse of <function>sd_bus_path_encode_many()</function>. It
|
||
decodes the passed object path according to the given
|
||
path template. For each <literal>%</literal> character in the
|
||
template, the caller must provide an output storage
|
||
(<literal>char **</literal>) via varargs. The decoded label
|
||
will be stored there. Each <literal>%</literal> character will
|
||
only match the current label. It will never match across labels.
|
||
Furthermore, only a single directive is allowed per label.
|
||
If <literal>NULL</literal> is passed as output storage, the
|
||
label is verified but not returned to the caller.</para>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>Return Value</title>
|
||
|
||
<para>On success, <function>sd_bus_path_encode()</function>
|
||
returns positive or 0, and a valid bus path in the return
|
||
argument. On success, <function>sd_bus_path_decode()</function>
|
||
returns a positive value if the prefixed matched, or 0 if it
|
||
did not. If the prefix matched, the external identifier is returned
|
||
in the return parameter. If it did not match, NULL is returned in
|
||
the return parameter. On failure, a negative errno-style error
|
||
number is returned by either function. The returned strings must
|
||
be
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>'d
|
||
by the caller.</para>
|
||
</refsect1>
|
||
|
||
<xi:include href="libsystemd-pkgconfig.xml" />
|
||
|
||
<refsect1>
|
||
<title>See Also</title>
|
||
|
||
<para>
|
||
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>sd-bus</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
||
<citerefentry project='man-pages'><refentrytitle>free</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
</para>
|
||
</refsect1>
|
||
|
||
</refentry>
|