nl_langinfo(3C) Standard C Library Functions nl_langinfo(3C)NAME
nl_langinfo - language information
SYNOPSIS
#include <langinfo.h>
char *nl_langinfo(nl_item item);
DESCRIPTION
The nl_langinfo() function returns a pointer to a null-terminated string containing information relevant to a particular language or cul-
tural area defined in the programs locale. The manifest constant names and values of item are defined by <langinfo.h>. For example:
nl_langinfo (ABDAY_1);
would return a pointer to the string "Dim" if the identified language was French and a French locale was correctly installed; or "Sun" if
the identified language was English.
RETURN VALUES
If setlocale(3C) has not been called successfully, or if data for a supported language is either not available, or if item is not defined
therein, then nl_langinfo() returns a pointer to the corresponding string in the C locale. In all locales, nl_langinfo() returns a pointer
to an empty string if item contains an invalid setting.
USAGE
The nl_langinfo() function can be used safely in multithreaded applications, as long as setlocale(3C) is not being called to change the
locale.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|CSI |Enabled |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe with exceptions |
+-----------------------------+-----------------------------+
SEE ALSO setlocale(3C), langinfo.h(3HEAD), nl_types.h(3HEAD), attributes(5), standards(5)WARNINGS
The array pointed to by the return value should not be modified by the program. Subsequent calls to nl_langinfo() may overwrite the array.
SunOS 5.10 24 Jul 2002 nl_langinfo(3C)
Check Out this Related Man Page
NL_LANGINFO(3) Linux Programmer's Manual NL_LANGINFO(3)NAME
nl_langinfo, nl_langinfo_l - query language and locale information
SYNOPSIS
#include <langinfo.h>
char *nl_langinfo(nl_item item);
char *nl_langinfo_l(nl_item item, locale_t locale);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
nl_langinfo_l():
Since glibc 2.24:
_POSIX_C_SOURCE >= 200809L
Glibc 2.23 and earlier:
_POSIX_C_SOURCE >= 200112L
DESCRIPTION
The nl_langinfo() and nl_langinfo_l() functions provide access to locale information in a more flexible way than localeconv(3). nl_lang-
info() returns a string which is the value corresponding to item in the program's current global locale. nl_langinfo() returns a string
which is the value corresponding to item for the locale identified by the locale object locale, which was previously created by newlo-
cale(1). Individual and additional elements of the locale categories can be queried.
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" (see 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
On success, these functions return a pointer to a string which is the value corresponding to item in the specified locale.
If no locale has been selected by setlocale(3) for the appropriate category, nl_langinfo() return a pointer to the corresponding string in
the "C" locale. The same is true of nl_langinfo_l() if locale specifies a locale where langinfo data is not defined.
If item is not valid, a pointer to an empty string is returned.
The pointer returned by these functions may point to static data that may be overwritten, or the pointer itself may be invalidated, by a
subsequent call to nl_langinfo(), nl_langinfo_l(), or setlocale(3). The same statements apply to nl_langinfo_l() if the locale object
referred to by locale is freed or modified by freelocale(3) or newlocale(3).
POSIX specifies that the application may not modify the string returned by these functions.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
+--------------+---------------+----------------+
|Interface | Attribute | Value |
+--------------+---------------+----------------+
|nl_langinfo() | Thread safety | MT-Safe locale |
+--------------+---------------+----------------+
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, SUSv2.
NOTES
The behavior of nl_langinfo_l() is undefined if locale is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object han-
dle.
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
", nl_langinfo(CODESET));
printf("%s
", nl_langinfo(RADIXCHAR));
exit(EXIT_SUCCESS);
}
SEE ALSO locale(1), localeconv(3), setlocale(3), charsets(7), locale(7)
The GNU C Library Reference Manual
GNU 2019-03-06 NL_LANGINFO(3)