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+.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
+.\"
+.\" 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.
+.\"
+.\" 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 ISWBLANK 3  1999-07-25 "GNU" "Linux Programmer's Manual"
+.SH NAME
+iswblank \- test for whitespace wide character
+.SH SYNOPSIS
+.nf
+.B #include <wctype.h>
+.sp
+.BI "int iswblank(wint_t " wc );
+.fi
+.SH DESCRIPTION
+The \fBiswblank\fP function is the wide-character equivalent of the
+\fBisblank\fP function. It tests whether \fIwc\fP is a wide character
+belonging to the wide character class "blank".
+.PP
+The wide character class "blank" is a subclass of the wide character class
+"space".
+.PP
+Being a subclass of the wide character class "space", the wide character class
+"blank" is disjoint from the wide character class "graph" and therefore also
+disjoint from its subclasses "alnum", "alpha", "upper", "lower", "digit",
+"xdigit", "punct".
+.PP
+The wide character class "blank" always contains at least the space character
+and the control character '\\t'.
+.SH "RETURN VALUE"
+The \fBiswblank\fP function returns non-zero if \fIwc\fP is a wide character
+belonging to the wide character class "blank". Otherwise it returns zero.
+.SH "CONFORMING TO"
+This function is a GNU extension.
+.SH "SEE ALSO"
+.BR isblank (3),
+.BR iswctype (3)
+.SH NOTES
+The behaviour of \fBiswblank\fP depends on the LC_CTYPE category of the
+current locale.