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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 isal-
     pha(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-charac-
     ter class "alpha" is disjoint from the wide-character class "cntrl".

     Being a subclass of the wide-character class "graph", the  wide-charac-
     ter 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-charac-
     ter 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

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

     +-----------+---------------+----------------+
     |Interface  | Attribute     | Value          |
     +-----------+---------------+----------------+
     |iswalpha() | Thread safety | MT-Safe locale |
     +-----------+---------------+----------------+

CONFORMING TO

     POSIX.1-2001, POSIX.1-2008, C99.

NOTES

     The behavior of iswalpha() depends on the LC_CTYPE category of the cur-
     rent locale.

SEE ALSO

     isalpha(3), iswctype(3)

COLOPHON

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GNU 2015-08-08 ISWALPHA(3)