333 lines
8.9 KiB
HTML
333 lines
8.9 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of NL_LANGINFO</TITLE>
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</HEAD><BODY>
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<H1>NL_LANGINFO</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2019-03-06<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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nl_langinfo, nl_langinfo_l - query language and locale information
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/langinfo.h">langinfo.h</A>></B>
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<B>char *nl_langinfo(nl_item </B><I>item</I><B>);</B>
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<B>char *nl_langinfo_l(nl_item </B><I>item</I><B>, locale_t </B><I>locale</I><B>);</B>
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</PRE>
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<P>
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Feature Test Macro Requirements for glibc (see
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)):
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<P>
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<B>nl_langinfo_l</B>():
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<DL COMPACT><DT id="1"><DD>
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Since glibc 2.24:
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<BR> _POSIX_C_SOURCE >= 200809L
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<BR>
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Glibc 2.23 and earlier:
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<BR> _POSIX_C_SOURCE >= 200112L
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</DL>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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The
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<B>nl_langinfo</B>()
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and
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<B>nl_langinfo_l</B>()
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functions provide access to locale information
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in a more flexible way than
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<B><A HREF="/cgi-bin/man/man2html?3+localeconv">localeconv</A></B>(3).
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<B>nl_langinfo</B>()
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returns a string which is the value corresponding to
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<I>item</I> in the program's current global
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locale.
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<B>nl_langinfo_l</B>()
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returns a string which is the value corresponding to <I>item</I>
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for the locale identified by the locale object <I>locale</I>,
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which was previously created by
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<B><A HREF="/cgi-bin/man/man2html?1+newlocale">newlocale</A></B>(1).
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Individual and additional elements of the locale categories can
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be queried.
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<B><A HREF="/cgi-bin/man/man2html?3+setlocale">setlocale</A></B>(3)
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needs to be executed with proper arguments before.
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<P>
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Examples for the locale elements that can be specified in <I>item</I>
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using the constants defined in <I><<A HREF="file:///usr/include/langinfo.h">langinfo.h</A>></I> are:
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<DL COMPACT>
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<DT id="2"><B>CODESET</B> (LC_CTYPE)
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<DD>
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Return a string with the name of the character encoding used in the
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selected locale, such as "UTF-8", "ISO-8859-1", or "ANSI_X3.4-1968"
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(better known as US-ASCII).
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This is the same string that you get with
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"locale charmap".
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For a list of character encoding names,
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try "locale -m" (see
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<B><A HREF="/cgi-bin/man/man2html?1+locale">locale</A></B>(1)).
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<DT id="3"><B>D_T_FMT</B> (LC_TIME)
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<DD>
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Return a string that can be used as a format string for
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<B><A HREF="/cgi-bin/man/man2html?3+strftime">strftime</A></B>(3)
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to represent time and date in a locale-specific way.
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<DT id="4"><B>D_FMT</B> (LC_TIME)
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<DD>
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Return a string that can be used as a format string for
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<B><A HREF="/cgi-bin/man/man2html?3+strftime">strftime</A></B>(3)
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to represent a date in a locale-specific way.
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<DT id="5"><B>T_FMT</B> (LC_TIME)
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<DD>
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Return a string that can be used as a format string for
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<B><A HREF="/cgi-bin/man/man2html?3+strftime">strftime</A></B>(3)
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to represent a time in a locale-specific way.
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<DT id="6"><B>DAY_</B>{1-7} (LC_TIME)
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<DD>
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Return name of the <I>n</I>-th day of the week. [Warning: this follows
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the US convention DAY_1 = Sunday, not the international convention
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(ISO 8601) that Monday is the first day of the week.]
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<DT id="7"><B>ABDAY_</B>{1-7} (LC_TIME)
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<DD>
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Return abbreviated name of the <I>n</I>-th day of the week.
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<DT id="8"><B>MON_</B>{1-12} (LC_TIME)
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<DD>
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Return name of the <I>n</I>-th month.
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<DT id="9"><B>ABMON_</B>{1-12} (LC_TIME)
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<DD>
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Return abbreviated name of the <I>n</I>-th month.
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<DT id="10"><B>RADIXCHAR</B> (LC_NUMERIC)
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<DD>
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Return radix character (decimal dot, decimal comma, etc.).
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<DT id="11"><B>THOUSEP</B> (LC_NUMERIC)
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<DD>
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Return separator character for thousands (groups of three digits).
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<DT id="12"><B>YESEXPR</B> (LC_MESSAGES)
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<DD>
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Return a regular expression that can be used with the
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<B><A HREF="/cgi-bin/man/man2html?3+regex">regex</A></B>(3)
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function to recognize a positive response to a yes/no question.
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<DT id="13"><B>NOEXPR</B> (LC_MESSAGES)
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<DD>
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Return a regular expression that can be used with the
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<B><A HREF="/cgi-bin/man/man2html?3+regex">regex</A></B>(3)
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function to recognize a negative response to a yes/no question.
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<DT id="14"><B>CRNCYSTR</B> (LC_MONETARY)
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<DD>
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Return the currency symbol, preceded by "-" if the symbol should
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appear before the value, "+" if the symbol should appear after the
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value, or "." if the symbol should replace the radix character.
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</DL>
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<P>
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The above list covers just some examples of items that can be requested.
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For a more detailed list, consult
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<I>The GNU C Library Reference Manual</I>.
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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On success, these functions return a pointer to a string which
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is the value corresponding to
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<I>item</I>
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in the specified locale.
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<P>
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If no locale has been selected by
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<B><A HREF="/cgi-bin/man/man2html?3+setlocale">setlocale</A></B>(3)
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for the appropriate category,
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<B>nl_langinfo</B>()
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return a pointer to the corresponding string in the "C" locale.
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The same is true of
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<B>nl_langinfo_l</B>()
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if
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<I>locale</I>
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specifies a locale where
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<I>langinfo</I>
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data is not defined.
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<P>
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If <I>item</I> is not valid, a pointer to an empty string is returned.
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<P>
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The pointer returned by these functions may point to static data that
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may be overwritten, or the pointer itself may be invalidated,
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by a subsequent call to
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<B>nl_langinfo</B>(),
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<B>nl_langinfo_l</B>(),
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or
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<B><A HREF="/cgi-bin/man/man2html?3+setlocale">setlocale</A></B>(3).
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The same statements apply to
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<B>nl_langinfo_l</B>()
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if the locale object referred to by
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<I>locale</I>
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is freed or modified by
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<B><A HREF="/cgi-bin/man/man2html?3+freelocale">freelocale</A></B>(3)
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or
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<B><A HREF="/cgi-bin/man/man2html?3+newlocale">newlocale</A></B>(3).
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<P>
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POSIX specifies that the application may not modify
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the string returned by these functions.
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<A NAME="lbAF"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>nl_langinfo</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe locale<BR></TD></TR>
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</TABLE>
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<A NAME="lbAG"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008, SUSv2.
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<A NAME="lbAH"> </A>
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<H2>NOTES</H2>
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The behavior of
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<B>nl_langinfo_l</B>()
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is undefined if
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<I>locale</I>
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is the special locale object
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<B>LC_GLOBAL_LOCALE</B>
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or is not a valid locale object handle.
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<A NAME="lbAI"> </A>
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<H2>EXAMPLE</H2>
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The following program sets the character type and the numeric locale
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according to the environment and queries the terminal character set and
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the radix character.
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<P>
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#include <<A HREF="file:///usr/include/langinfo.h">langinfo.h</A>>
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#include <<A HREF="file:///usr/include/locale.h">locale.h</A>>
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#include <<A HREF="file:///usr/include/stdio.h">stdio.h</A>>
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#include <<A HREF="file:///usr/include/stdlib.h">stdlib.h</A>>
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<P>
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int
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main(int argc, char *argv[])
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{
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<BR> setlocale(LC_CTYPE, "");
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<BR> setlocale(LC_NUMERIC, "");
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<P>
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<BR> printf("%s\n", nl_langinfo(CODESET));
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<BR> printf("%s\n", nl_langinfo(RADIXCHAR));
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<P>
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<BR> exit(EXIT_SUCCESS);
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}
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<A NAME="lbAJ"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?1+locale">locale</A></B>(1),
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<B><A HREF="/cgi-bin/man/man2html?3+localeconv">localeconv</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+setlocale">setlocale</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?7+charsets">charsets</A></B>(7),
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<B><A HREF="/cgi-bin/man/man2html?7+locale">locale</A></B>(7)
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<P>
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The GNU C Library Reference Manual
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<A NAME="lbAK"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="15"><A HREF="#lbAB">NAME</A><DD>
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<DT id="16"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="17"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="18"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="19"><A HREF="#lbAF">ATTRIBUTES</A><DD>
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<DT id="20"><A HREF="#lbAG">CONFORMING TO</A><DD>
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<DT id="21"><A HREF="#lbAH">NOTES</A><DD>
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<DT id="22"><A HREF="#lbAI">EXAMPLE</A><DD>
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<DT id="23"><A HREF="#lbAJ">SEE ALSO</A><DD>
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<DT id="24"><A HREF="#lbAK">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:49 GMT, March 31, 2021
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</BODY>
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</HTML>
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