.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>

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.\" 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 4.15 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/.