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 recognize 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 recognize 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_langinfo() or
setlocale(3).
SUSv2, POSIX.1-2001.
EXAMPLE¶
The following program sets the character type locale according to the
environment and queries the terminal character set.
#include <langinfo.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
int
main(int argc, char *argv[])
{
setlocale(LC_CTYPE,"");
printf("%s\n",nl_langinfo(CODESET));
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 3.44 of the Linux
man-pages project. A
description of the project, and information about reporting bugs, can be found
at
http://www.kernel.org/doc/man-pages/.