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       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,  respectively;  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  languages,  only  these
       functions  and  the functions in the reference pages listed in the SEE ALSO section should
       be used for character classification.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       iswalpha(),  iswcntrl(),  iswctype(),  iswdigit(),  iswgraph(),  iswlower(),   iswprint(),
       iswpunct(), iswspace(), iswupper(), iswxdigit(), setlocale(), 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  Electrical  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.kernel.org/doc/man-pages/reporting_bugs.html .