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Date: Mon, 15 Mar 93 10:57:50 JST
From: "Akio    Kido" <kido@vnet.IBM.COM>
To: sc22wg15@dkuug.dk, sc22wg20@dkuug.dk, XoJIG@xopen.co.uk,
        sig-international@osf.org, uojlg-bse@uiap.ui.org,
        efischer@donald.aix.kingston.ibm.com
Subject: MSE 4.5.2.2.mm
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.SK
.H 4 "Extensible wide character classification functions"
.P
The functions
.Cf wctype
and
.Cf iswctype
provide extensible wide character classification
as well as testing equivalent to that performed
by the functions described in the previous subclause (4.5.2.1).
.H 5 "The \*(Cwwctype\fP function"
.HU Synopsis
.Cb
	#include <wchar.h>
	wctype_t wctype(const char *property);
.Ce
.HU Description
.P
The
.Cf wctype
function constructs a value with type
.Cf wctype_t
that describes a class of wide characters identified by the string argument,
.Cf property .
The constructed value is affected by the
.Cf LC_CTYPE
category of the current locale;
the constructed value becomes indeterminate
if the category's setting is changed.
.P
The eleven strings listed in the description of the
.Cf iswctype
function shall be valid in all locales as
.Cf property
arguments to the
.Cf wctype
function.
.HU Returns
.P
If
.Cf property
identifies a valid class of wide characters
according to the
.Cf LC_CTYPE
category of the current locale,
the
.Cf wctype
function returns a nonzero value
that is valid as the second argument to the
.Cf iswctype
function;
otherwise,
it returns zero.
.H 5 "The \*(Cwiswctype\fP function"
.HU Synopsis
.Cb
	#include <wchar.h>
	int iswctype(wint_t wc, wctype_t desc);
.Ce
.HU Description
.P
The
.Cf iswctype
function determines whether the wide character
.Cf wc
has the property described by
.Cf desc .
Valid values of
.Cf desc
are defined in the description of the
.Cf wctype
function.
The value of
.Cf desc
shall be that returned by a previous call to the
.Cf wctype
function which has not become indeterminate.
.P
Each of the following eleven expressions
shall have a truth-value equivalent
to the call to the wide character testing function
(4.5.2.1)
in the comment that follows the expression:
.Cb
	iswctype(wc, wctype("alnum"))    /*iswalnum(wc)*/
	iswctype(wc, wctype("alpha"))    /*iswalpha(wc)*/
	iswctype(wc, wctype("cntrl"))    /*iswcntrl(wc)*/
	iswctype(wc, wctype("digit"))    /*iswdigit(wc)*/
	iswctype(wc, wctype("graph"))    /*iswgraph(wc)*/
	iswctype(wc, wctype("lower"))    /*iswlower(wc)*/
	iswctype(wc, wctype("print"))    /*iswprint(wc)*/
	iswctype(wc, wctype("punct"))    /*iswpunct(wc)*/
	iswctype(wc, wctype("space"))    /*iswspace(wc)*/
	iswctype(wc, wctype("upper"))    /*iswupper(wc)*/
	iswctype(wc, wctype("xdigit"))   /*iswxdigit(wc)*/
.Ce
.HU Returns
.P
The
.Cf iswctype
function returns nonzero
(true)
if and only if the value of the wide character
.Cf wc
has the property described by
.Cf desc .