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iswalpha(3)

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 be‐
       longing to the wide-character class  "alpha".   Otherwise,  it  returns
       zero.

ATTRIBUTES
       For  an  explanation  of  the  terms  used in this section, see attrib‐
       utes(7).  allbox; lb lb lb l l l.  Interface Attribute Value T{  iswal‐
       pha() T}   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
       This  page  is  part of release 5.02 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/.

GNU                               2015-08-08                       ISWALPHA(3)
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