NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | NOTES | EXAMPLE | SEE ALSO | COLOPHON

NL_LANGINFO(3)            Linux Programmer's Manual           NL_LANGINFO(3)

NAME         top

       nl_langinfo, nl_langinfo_l - query language and locale information

SYNOPSIS         top

       #include <langinfo.h>

       char *nl_langinfo(nl_item item);

       char *nl_langinfo_l(nl_item item, locale_t locale);

DESCRIPTION         top

       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.

       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         top

       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         top

       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         top

       POSIX.1-2001, POSIX.1-2008, SUSv2.

NOTES         top

       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         top

       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         top

       locale(1), localeconv(3), setlocale(3), charsets(7), locale(7)
       The GNU C Library Reference Manual

COLOPHON         top

       This page is part of release 4.07 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
       https://www.kernel.org/doc/man-pages/.

GNU                              2015-07-31                   NL_LANGINFO(3)