Libc-1082.50.1.tar.gz

[apple/libc.git] / locale / FreeBSD / wctype.3

.\" Copyright (c) 2002 Tim J. Robbins
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.\" $FreeBSD: src/lib/libc/locale/wctype.3,v 1.7 2006/10/13 16:11:12 ru Exp $
.\"
.Dd March 27, 2004
.Dt WCTYPE 3
.Os
.Sh NAME
.Nm iswctype ,
.Nm iswctype_l ,
.Nm wctype ,
.Nm wctype_l
.Nd "wide character class functions"
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In wctype.h
.Ft int
.Fo iswctype
.Fa "wint_t wc"
.Fa "wctype_t charclass"
.Fc
.Ft wctype_t
.Fo wctype
.Fa "const char *property"
.Fc
.In wctype.h
.In xlocale.h
.Ft int
.Fo iswctype_l
.Fa "wint_t wc"
.Fa "wctype_t charclass"
.Fa "locale_t loc"
.Fc
.Ft wctype_t
.Fo wctype_l
.Fa "const char *property"
.Fa "locale_t loc"
.Fc
.Sh DESCRIPTION
The
.Fn wctype
function returns a value of type
.Vt wctype_t ,
which represents the requested wide character class and
may be used as the second argument for calls to
.Fn iswctype .
.Pp
The following character class names are recognised:
.Bl -column -offset indent ".Li alnum" ".Li cntrl" ".Li ideogram" ".Li print" ".Li space"
.It Li "alnum	cntrl	ideogram	print	space	xdigit"
.It Li "alpha	digit	lower	punct	special"
.It Li "blank	graph	phonogram	rune	upper"
.El
.Pp
The
.Fn iswctype
function checks whether the wide character
.Fa wc
is in the character class
.Fa charclass .
.Pp
Although the
.Fn iswctype
and
.Fn wctype
functions use the current locale, the
.Fn iswctype_l
and
.Fn wctype_l
functions may be passed locales directly. See
.Xr xlocale 3
for more information.
.Sh RETURN VALUES
The
.Fn iswctype
function returns non-zero if and only if
.Fa wc
has the property described by
.Fa charclass ,
or
.Fa charclass
is zero.
.Pp
The
.Fn wctype
function returns 0 if
.Fa property
is invalid; otherwise, it returns a value of type
.Vt wctype_t
that can be used in subsequent calls to
.Fn iswctype .
.Sh EXAMPLES
Reimplement
.Xr iswalpha 3
in terms of
.Fn iswctype
and
.Fn wctype :
.Bd -literal -offset indent
int
myiswalpha(wint_t wc)
{
	return (iswctype(wc, wctype("alpha")));
}
.Ed
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr nextwctype 3 ,
.Xr xlocale 3
.Sh STANDARDS
The
.Fn iswctype
and
.Fn wctype
functions conform to
.St -p1003.1-2001 .
The
.Dq Li ideogram ,
.Dq Li phonogram ,
.Dq Li special ,
and
.Dq Li rune
character classes are extensions.
.Sh HISTORY
The
.Fn iswctype
and
.Fn wctype
functions first appeared in
.Fx 5.0 .