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192 lines
7.5 KiB
HTML
192 lines
7.5 KiB
HTML
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<title>GETTEXT</title>
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</head>
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<body>
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<h1 align=center>GETTEXT</h1>
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<a href="#NAME">NAME</a><br>
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<a href="#SYNOPSIS">SYNOPSIS</a><br>
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<a href="#DESCRIPTION">DESCRIPTION</a><br>
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<a href="#RETURN VALUE">RETURN VALUE</a><br>
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<a href="#ERRORS">ERRORS</a><br>
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<a href="#BUGS">BUGS</a><br>
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<a href="#SEE ALSO">SEE ALSO</a><br>
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<hr>
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<!-- Creator : groff version 1.17 -->
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<a name="NAME"></a>
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<h2>NAME</h2>
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<td width="10%"></td><td width="90%">
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gettext, dgettext, dcgettext - translate message</td></table>
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<a name="SYNOPSIS"></a>
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<h2>SYNOPSIS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<pre><b>#include <libintl.h>
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char * gettext (const char *</b> <i>msgid</i><b>);
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char * dgettext (const char *</b> <i>domainname</i><b>, const char *</b> <i>msgid</i><b>);
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char * dcgettext (const char *</b> <i>domainname</i><b>, const char *</b> <i>msgid</i><b>,
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int</b> <i>category</i><b>);
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</b></pre></td></table>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The <b>gettext</b>, <b>dgettext</b> and <b>dcgettext</b>
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functions attempt to translate a text string into the user's
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native language, by looking up the translation in a message
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catalog.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The <i>msgid</i> argument identifies the message to be
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translated. By convention, it is the English version of the
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message, with non-ASCII characters replaced by ASCII
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approximations. This choice allows the translators to work
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with message catalogs, called PO files, that contain both
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the English and the translated versions of each message, and
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can be installed using the <b>msgfmt</b>
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utility.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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A message domain is a set of translatable <i>msgid</i>
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messages. Usually, every software package has its own
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message domain. The domain name is used to determine the
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message catalog where the translation is looked up; it must
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be a non-empty string. For the <b>gettext</b> function, it
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is specified through a preceding <b>textdomain</b> call. For
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the <b>dgettext</b> and <b>dcgettext</b> functions, it is
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passed as the <i>domainname</i> argument; if this argument
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is NULL, the domain name specified through a preceding
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<b>textdomain</b> call is used instead.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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Translation lookup operates in the context of the current
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locale. For the <b>gettext</b> and <b>dgettext</b>
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functions, the <b>LC_MESSAGES</b> locale facet is used. It
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is determined by a preceding call to the <b>setlocale</b>
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function. <b>setlocale(LC_ALL,"")</b> initializes
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the <b>LC_MESSAGES</b> locale based on the first nonempty
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value of the three environment variables <b>LC_ALL</b>,
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<b>LC_MESSAGES</b>, <b>LANG</b>; see <b>setlocale</b>(3).
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For the <b>dcgettext</b> function, the locale facet is
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determined by the <i>category</i> argument, which should be
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one of the <b>LC_xxx</b> constants defined in the
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<locale.h> header, excluding <b>LC_ALL</b>. In both
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cases, the functions also use the <b>LC_CTYPE</b> locale
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facet in order to convert the translated message from the
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translator's codeset to the current locale's codeset, unless
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overridden by a prior call to the
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<b>bind_textdomain_codeset</b> function.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The message catalog used by the functions is at the pathname
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<i>dirname</i>/<i>locale</i>/<i>category</i>/<i>domainname</i>.mo.
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Here <i>dirname</i> is the directory specified through
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<b>bindtextdomain</b>. Its default is system and
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configuration dependent; typically it is
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<i>prefix</i>/share/locale, where <i>prefix</i> is the
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installation prefix of the package. <i>locale</i> is the
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name of the current locale facet; the GNU implementation
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also tries generalizations, such as the language name
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without the territory name. <i>category</i> is
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<b>LC_MESSAGES</b> for the <b>gettext</b> and
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<b>dgettext</b> functions, or the argument passed to the
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<b>dcgettext</b> function.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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If the <b>LANGUAGE</b> environment variable is set to a
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nonempty value, and the locale is not the "C"
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locale, the value of <b>LANGUAGE</b> is assumed to contain a
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colon separated list of locale names. The functions will
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attempt to look up a translation of <i>msgid</i> in each of
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the locales in turn. This is a GNU extension.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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In the "C" locale, or if none of the used catalogs
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contain a translation for <i>msgid</i>, the <b>gettext</b>,
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<b>dgettext</b> and <b>dcgettext</b> functions return
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<i>msgid</i>.</td></table>
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<a name="RETURN VALUE"></a>
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<h2>RETURN VALUE</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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If a translation was found in one of the specified catalogs,
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it is converted to the locale's codeset and returned. The
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resulting string is statically allocated and must not be
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modified or freed. Otherwise <i>msgid</i> is
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returned.</td></table>
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<a name="ERRORS"></a>
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<h2>ERRORS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>errno</b> is not modified.</td></table>
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<a name="BUGS"></a>
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<h2>BUGS</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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The return type ought to be <b>const char *</b>, but is
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<b>char *</b> to avoid warnings in C code predating ANSI
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C.</td></table>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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When an empty string is used for <i>msgid</i>, the functions
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may return a nonempty string.</td></table>
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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<table width="100%" border=0 rules="none" frame="void"
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cols="2" cellspacing="0" cellpadding="0">
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<tr valign="top" align="left">
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<td width="10%"></td><td width="90%">
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<b>ngettext</b>(3), <b>dngettext</b>(3),
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<b>dcngettext</b>(3), <b>setlocale</b>(3),
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<b>textdomain</b>(3), <b>bindtextdomain</b>(3),
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<b>bind_textdomain_codeset</b>(3),
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<b>msgfmt</b>(1)</td></table>
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<hr>
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</body>
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</html>
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