ISWALNUM(3)                         Linux Programmer's Manual                         ISWALNUM(3)



NAME
       iswalnum - test for alphanumeric wide character

SYNOPSIS
       #include <wctype.h>

       int iswalnum(wint_t wc);

DESCRIPTION
       The  iswalnum()  function is the wide-character equivalent of the isalnum(3) function.  It
       tests whether wc is a wide character belonging to the wide-character class "alnum".

       The wide-character class "alnum" is a subclass of the wide-character  class  "graph",  and
       therefore also a subclass of the wide-character class "print".

       Being  a subclass of the wide-character class "print", the wide-character class "alnum" is
       disjoint from the wide-character class "cntrl".

       Being a subclass of the wide-character class "graph", the wide-character class "alnum"  is
       disjoint from the wide-character class "space" and its subclass "blank".

       The wide-character class "alnum" is disjoint from the wide-character class "punct".

       The  wide-character  class  "alnum" is the union of the wide-character classes "alpha" and
       "digit".  As such, it also contains the wide-character class "xdigit".

       The wide-character class "alnum" always contains at least the letters 'A' to 'Z',  'a'  to
       'z' and the digits '0' to '9'.

RETURN VALUE
       The  iswalnum()  function returns nonzero if wc is a wide character belonging to the wide-
       character class "alnum".  Otherwise, it returns zero.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The iswalnum() function is thread-safe with exceptions.  It can be safely used  in  multi‐
       threaded  applications,  as long as setlocale(3) is not called to change the locale during
       its execution.

CONFORMING TO
       C99.

NOTES
       The behavior of iswalnum() depends on the LC_CTYPE category of the current locale.

SEE ALSO
       isalnum(3), iswctype(3)

COLOPHON
       This page is part of release 3.74 of the Linux man-pages project.  A  description  of  the
       project,  information  about  reporting  bugs, and the latest version of this page, can be
       found at http://www.kernel.org/doc/man-pages/.



GNU                                         2014-01-28                                ISWALNUM(3)