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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_langinfo() 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 newlocale(1).  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" (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).

       ┌──────────────┬───────────────┬────────────────┐
       │InterfaceAttributeValue          │
       ├──────────────┼───────────────┼────────────────┤
       │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 handle.

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

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