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.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
.\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
.\" %%%LICENSE_END
.\"
.\" References consulted:
.\" GNU glibc-2 source code and manual
.\" Dinkumware C library reference http://www.dinkumware.com/
.\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
.\" ISO/IEC 9899:1999
.\"
.TH ISWALPHA 3 2015-08-08 "GNU" "Linux Programmer's Manual"
.SH NAME
iswalpha \- test for alphabetic wide character
.SH SYNOPSIS
.nf
.B #include <wctype.h>
.PP
.BI "int iswalpha(wint_t " wc );
.fi
.SH DESCRIPTION
The
.BR iswalpha ()
function is the wide-character equivalent of the
.BR isalpha (3)
function.
It tests whether
.I wc
is a wide character
belonging to the wide-character class "alpha".
.PP
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".
.PP
Being a subclass of the wide-character class "print",
the wide-character class
"alpha" is disjoint from the wide-character class "cntrl".
.PP
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".
.PP
Being a subclass of the wide-character class "alnum",
the wide-character class "alpha" is disjoint from the
wide-character class "punct".
.PP
The wide-character class "alpha" is disjoint from the wide-character class
"digit".
.PP
The wide-character class "alpha" contains the wide-character classes "upper"
and "lower".
.PP
The wide-character class "alpha" always contains at least the
letters \(aqA\(aq to \(aqZ\(aq and \(aqa\(aq to \(aqz\(aq.
.SH RETURN VALUE
The
.BR iswalpha ()
function returns nonzero
if
.I wc
is a wide character
belonging to the wide-character class "alpha".
Otherwise, it returns zero.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lb lb lb
l l l.
Interface Attribute Value
T{
.BR iswalpha ()
T} Thread safety MT-Safe locale
.TE
.SH CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99.
.SH NOTES
The behavior of
.BR iswalpha ()
depends on the
.B LC_CTYPE
category of the
current locale.
.SH SEE ALSO
.BR isalpha (3),
.BR iswctype (3)
.SH COLOPHON
This page is part of release 5.09 of the Linux
.I 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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