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

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

NAME
       iswalnum, iswalnum_l — test for an alphanumeric wide-character code

SYNOPSIS
       #include <wctype.h>

       int iswalnum(wint_t wc);
       int iswalnum_l(wint_t wc, locale_t locale);

DESCRIPTION
       For iswalnum(): The functionality described on this reference  page  is
       aligned	with the ISO C standard. Any conflict between the requirements
       described here and the ISO C standard is unintentional. This volume  of
       POSIX.1‐2008 defers to the ISO C standard.

       The  iswalnum()	and  iswalnum_l() functions shall test whether wc is a
       wide-character code representing a character of class alpha or digit in
       the  current  locale,  or  in the locale represented by locale, respec‐
       tively; see the Base Definitions volume	of  POSIX.1‐2008,  Chapter  7,
       Locale.

       The  wc	argument is a wint_t, the value of which the application shall
       ensure is a wide-character code corresponding to a valid	 character  in
       the  current  locale,  or  equal to the value of the macro WEOF. If the
       argument has any other value, the behavior is undefined.

       The behavior is undefined if the locale argument to iswalnum_l() is the
       special	locale object LC_GLOBAL_LOCALE or is not a valid locale object
       handle.

RETURN VALUE
       The iswalnum() and iswalnum_l() functions shall return non-zero	if  wc
       is an alphanumeric wide-character code; otherwise, they shall return 0.

ERRORS
       No errors are defined.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       To  ensure  applications	 portability,  especially  across natural lan‐
       guages, only these functions and the functions in the  reference	 pages
       listed in the SEE ALSO section should be used for character classifica‐
       tion.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       iswalpha(), iswcntrl(), iswctype(), iswdigit(), iswgraph(), iswlower(),
       iswprint(),  iswpunct(),	 iswspace(),  iswupper(),  iswxdigit(), setlo‐
       cale(), uselocale()

       The  Base  Definitions  volume  of  POSIX.1‐2008,  Chapter  7,  Locale,
       <locale.h>, <stdio.h>, <wctype.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
       cal  and	 Electronics  Engineers,  Inc  and  The	 Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum	 1  applied.)  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.unix.org/online.html .

       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,	 see  https://www.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			  ISWALNUM(3P)
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