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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

   For   an   explanation   of   the  terms  used  in  this  section,  see
   attributes(7).

   
   Interface   Attribute      Value          
   
   iswalnum()  Thread safety  MT-Safe locale

CONFORMING TO

   POSIX.1-2001, POSIX.1-2008, 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 4.09 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
   https://www.kernel.org/doc/man-pages/.



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