.\" 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
+.\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
.\" ISO/IEC 9899:1999
.\"
-.TH ISWDIGIT 3 1999-07-25 "GNU" "Linux Programmer's Manual"
+.TH ISWDIGIT 3 2015-08-08 "GNU" "Linux Programmer's Manual"
.SH NAME
iswdigit \- test for decimal digit wide character
.SH SYNOPSIS
.nf
.B #include <wctype.h>
-.sp
+.PP
.BI "int iswdigit(wint_t " wc );
.fi
.SH DESCRIPTION
-The \fBiswdigit\fP() function is the wide-character equivalent of the
-\fBisdigit\fP() function.
-It tests whether \fIwc\fP is a wide character
+The
+.BR iswdigit ()
+function is the wide-character equivalent of the
+.BR isdigit (3)
+function.
+It tests whether
+.I wc
+is a wide character
belonging to the wide-character class "digit".
.PP
The wide-character class "digit" is a subclass of the wide-character class
-"xdigit", and therefore also a subclass
+"xdigit", and therefore also a subclass
of the wide-character class "alnum", of
the wide-character class "graph" and of the wide-character class "print".
.PP
-Being a subclass of the wide character
+Being a subclass of the wide character
class "print", the wide-character class
"digit" is disjoint from the wide-character class "cntrl".
.PP
-Being a subclass of the wide-character class "graph",
+Being a subclass of the wide-character class "graph",
the wide-character class
"digit" is disjoint from the wide-character class "space" and its subclass
"blank".
.PP
-Being a subclass of the wide-character
+Being a subclass of the wide-character
class "alnum", the wide-character class
"digit" is disjoint from the wide-character class "punct".
.PP
-The wide-character class "digit" is
+The wide-character class "digit" is
disjoint from the wide-character class
"alpha" and therefore also disjoint from its subclasses "lower", "upper".
.PP
-The wide-character class "digit" always
-contains exactly the digits '0' to '9'.
-.SH "RETURN VALUE"
-The \fBiswdigit\fP() function returns non-zero
-if \fIwc\fP is a wide character
+The wide-character class "digit" always
+contains exactly the digits \(aq0\(aq to \(aq9\(aq.
+.SH RETURN VALUE
+The
+.BR iswdigit ()
+function returns nonzero
+if
+.I wc
+is a wide character
belonging to the wide-character class "digit".
-Otherwise it returns zero.
-.SH "CONFORMING TO"
-C99.
-.SH "SEE ALSO"
-.BR isdigit (3),
-.BR iswctype (3)
+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 iswdigit ()
+T} Thread safety MT-Safe locale
+.TE
+.SH CONFORMING TO
+POSIX.1-2001, POSIX.1-2008, C99.
.SH NOTES
-The behaviour of \fBiswdigit\fP() depends on the LC_CTYPE category of the
+The behavior of
+.BR iswdigit ()
+depends on the
+.B LC_CTYPE
+category of the
current locale.
+.SH SEE ALSO
+.BR isdigit (3),
+.BR iswctype (3)