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NL_LANGINFO(3) Linux Programmer's Manual NL_LANGINFO(3)
NAME
nl_langinfo - query language and locale information
SYNOPSIS
#include <langinfo.h>
char *nl_langinfo(nl_item item);
DESCRIPTION
The nl_langinfo() function provides access to locale information in a more flexible way
than localeconv(3) does. Individual and additional elements of the locale categories can
be queried. setlocale(3) needs to be executed with proper arguments before.
Examples for the locale elements that can be specified in item using the constants defined
in <langinfo.h> are:
CODESET (LC_CTYPE)
Return a string with the name of the character encoding used in the selected
locale, such as "UTF-8", "ISO-8859-1", or "ANSI_X3.4-1968" (better known as US-
ASCII). This is the same string that you get with "locale charmap". For a list of
character encoding names, try "locale -m", cf. locale(1).
D_T_FMT (LC_TIME)
Return a string that can be used as a format string for strftime(3) to represent
time and date in a locale-specific way.
D_FMT (LC_TIME)
Return a string that can be used as a format string for strftime(3) to represent a
date in a locale-specific way.
T_FMT (LC_TIME)
Return a string that can be used as a format string for strftime(3) to represent a
time in a locale-specific way.
DAY_{1–7} (LC_TIME)
Return name of the n-th day of the week. [Warning: this follows the US convention
DAY_1 = Sunday, not the international convention (ISO 8601) that Monday is the
first day of the week.]
ABDAY_{1–7} (LC_TIME)
Return abbreviated name of the n-th day of the week.
MON_{1–12} (LC_TIME)
Return name of the n-th month.
ABMON_{1–12} (LC_TIME)
Return abbreviated name of the n-th month.
RADIXCHAR (LC_NUMERIC)
Return radix character (decimal dot, decimal comma, etc.).
THOUSEP (LC_NUMERIC)
Return separator character for thousands (groups of three digits).
YESEXPR (LC_MESSAGES)
Return a regular expression that can be used with the regex(3) function to recog‐
nize a positive response to a yes/no question.
NOEXPR (LC_MESSAGES)
Return a regular expression that can be used with the regex(3) function to recog‐
nize a negative response to a yes/no question.
CRNCYSTR (LC_MONETARY)
Return the currency symbol, preceded by "-" if the symbol should appear before the
value, "+" if the symbol should appear after the value, or "." if the symbol should
replace the radix character.
The above list covers just some examples of items that can be requested. For a more
detailed list, consult The GNU C Library Reference Manual.
RETURN VALUE
If no locale has been selected by setlocale(3) for the appropriate category, nl_langinfo()
returns a pointer to the corresponding string in the "C" locale.
If item is not valid, a pointer to an empty string is returned.
This pointer may point to static data that may be overwritten on the next call to nl_lang‐
info() or setlocale(3).
CONFORMING TO
SUSv2, POSIX.1-2001.
EXAMPLE
The following program sets the character type and the numeric locale according to the
environment and queries the terminal character set and the radix character.
#include <langinfo.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
int
main(int argc, char *argv[])
{
setlocale(LC_CTYPE, "");
setlocale(LC_NUMERIC, "");
printf("%s\n", nl_langinfo(CODESET));
printf("%s\n", nl_langinfo(RADIXCHAR));
exit(EXIT_SUCCESS);
}
SEE ALSO
locale(1), localeconv(3), setlocale(3), charsets(7), locale(7)
The GNU C Library Reference Manual
COLOPHON
This page is part of release 3.74 of the Linux man-pages project. A description of the
project, information about reporting bugs, and the latest version of this page, can be
found at http://www.kernel.org/doc/man-pages/.
GNU 2014-05-28 NL_LANGINFO(3)
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