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



NAME
       iswalpha - test for alphabetic wide character

SYNOPSIS
       #include <wctype.h>

       int iswalpha(wint_t wc);

DESCRIPTION
       The  iswalpha()  function is the wide-character equivalent of the isalpha(3) function.  It
       tests whether wc is a wide character belonging to the wide-character class "alpha".

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

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

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

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

       The wide-character class "alpha" is disjoint from the wide-character class "digit".

       The wide-character class "alpha" contains the wide-character classes "upper" and "lower".

       The  wide-character  class "alpha" always contains at least the letters 'A' to 'Z' and 'a'
       to 'z'.

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

ATTRIBUTES
   Multithreading (see pthreads(7))
       The  iswalpha()  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 iswalpha() depends on the LC_CTYPE category of the current locale.

SEE ALSO
       isalpha(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                                ISWALPHA(3)