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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.1‐2017 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.1‐2017,
       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 locale used by the function, 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.1‐2017, Chapter  7,  Locale,  <locale.h>,  <stdio.h>,
       <wctype.h>

COPYRIGHT

       Portions  of  this  text  are  reprinted  and  reproduced in electronic form from IEEE Std
       1003.1-2017, Standard for Information Technology -- Portable  Operating  System  Interface
       (POSIX),  The  Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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.opengroup.org/unix/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 .