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+'\" t
+.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
+.\"
+.\" SPDX-License-Identifier: GPL-2.0-or-later
+.\"
+.\" 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 iswupper 3 2023-07-20 "Linux man-pages 6.05.01"
+.SH NAME
+iswupper \- test for uppercase wide character
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <wctype.h>
+.PP
+.BI "int iswupper(wint_t " wc );
+.fi
+.SH DESCRIPTION
+The
+.BR iswupper ()
+function is the wide-character equivalent of the
+.BR isupper (3)
+function.
+It tests whether
+.I wc
+is a wide character
+belonging to the wide-character class "upper".
+.PP
+The wide-character class "upper" is a subclass of the wide-character class
+"alpha", 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 class "print", the wide-character class
+"upper" is disjoint from the wide-character class "cntrl".
+.PP
+Being a subclass of the wide-character class "graph", the wide-character class
+"upper" 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
+"upper" is disjoint from the wide-character class "punct".
+.PP
+Being a subclass of the wide-character class "alpha", the wide-character class
+"upper" is disjoint from the wide-character class "digit".
+.PP
+The wide-character class "upper" contains at least those characters
+.I wc
+which are equal to
+.I towupper(wc)
+and different from
+.IR towlower(wc) .
+.PP
+The wide-character class "upper" always contains at least the
+letters \[aq]A\[aq] to \[aq]Z\[aq].
+.SH RETURN VALUE
+The
+.BR iswupper ()
+function returns nonzero if
+.I wc
+is a wide character
+belonging to the wide-character class "upper".
+Otherwise, it returns zero.
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR iswupper ()
+T}	Thread safety	MT-Safe locale
+.TE
+.sp 1
+.SH STANDARDS
+C11, POSIX.1-2008.
+.SH HISTORY
+POSIX.1-2001, C99.
+.SH NOTES
+The behavior of
+.BR iswupper ()
+depends on the
+.B LC_CTYPE
+category of the
+current locale.
+.PP
+This function is not very appropriate for dealing with Unicode characters,
+because Unicode knows about three cases: upper, lower, and title case.
+.SH SEE ALSO
+.BR isupper (3),
+.BR iswctype (3),
+.BR towupper (3)