NL_LANGINFO(3P)                                     POSIX Programmer's Manual                                    NL_LANGINFO(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       nl_langinfo - language information

SYNOPSIS
       #include <langinfo.h>

       char *nl_langinfo(nl_item item);


DESCRIPTION
       The  nl_langinfo() function shall return a pointer to a string containing information relevant to the particular language
       or cultural area defined in the program's locale (see <langinfo.h>).  The manifest constant names and values of item  are
       defined in <langinfo.h>.  For example:


              nl_langinfo(ABDAY_1)

       would  return  a  pointer to the string "Dom" if the identified language was Portuguese, and "Sun" if the identified lan-
       guage was English.

       Calls to setlocale() with a category corresponding to the category of item (see <langinfo.h>), or to the category  LC_ALL
       , may overwrite the array pointed to by the return value.

       The  nl_langinfo()  function need not be reentrant. A function that is not required to be reentrant is not required to be
       thread-safe.

RETURN VALUE
       In a locale where langinfo data is not defined, nl_langinfo() shall return a pointer to the corresponding string  in  the
       POSIX  locale.  In  all locales, nl_langinfo() shall return a pointer to an empty string if item contains an invalid set-
       ting.

       This pointer may point to static data that may be overwritten on the next call.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
   Getting Date and Time Formatting Information
       The following example returns a pointer to a string containing date and time formatting information, as  defined  in  the
       LC_TIME category of the current locale.


              #include <time.h>
              #include <langinfo.h>
              ...
              strftime(datestring, sizeof(datestring), nl_langinfo(D_T_FMT), tm);
              ...

APPLICATION USAGE
       The  array  pointed to by the return value should not be modified by the program, but may be modified by further calls to
       nl_langinfo().

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       setlocale(), the Base Definitions volume of IEEE Std 1003.1-2001, Chapter 7, Locale, <langinfo.h>, <nl_types.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                               NL_LANGINFO(3P)