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Linux 2.6 - man page for nl_langinfo (linux section 3posix)

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

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 rele-
       vant 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 <lang-
       info.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 language was English.

       Calls  to  setlocale()  with  a category corresponding to the category of item (see <lang-
       info.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 setting.

       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, Copyright (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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003				   NL_LANGINFO(P)


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