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+'\" t
+.\" and Copyright (C) 2014 Michael Kerrisk <mtk.manpages@gmail.com>
+.\"
+.\" 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 towupper 3 2023-07-20 "Linux man-pages 6.05.01"
+.SH NAME
+towupper, towupper_l \- convert a wide character to uppercase
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <wctype.h>
+.PP
+.BI "wint_t towupper(wint_t " wc );
+.BI "wint_t towupper_l(wint_t " wc ", locale_t " locale );
+.fi
+.PP
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.PP
+.BR towupper_l ():
+.nf
+    Since glibc 2.10:
+        _XOPEN_SOURCE >= 700
+    Before glibc 2.10:
+        _GNU_SOURCE
+.fi
+.SH DESCRIPTION
+The
+.BR towupper ()
+function is the wide-character equivalent of the
+.BR toupper (3)
+function.
+If
+.I wc
+is a lowercase wide character,
+and there exists an uppercase equivalent in the current locale,
+it returns the uppercase equivalent of
+.IR wc .
+In all other cases,
+.I wc
+is returned unchanged.
+.PP
+The
+.BR towupper_l ()
+function performs the same task,
+but performs the conversion based on the character type information in
+the locale specified by
+.IR locale .
+The behavior of
+.BR towupper_l ()
+is undefined if
+.I locale
+is the special locale object
+.B LC_GLOBAL_LOCALE
+(see
+.BR duplocale (3))
+or is not a valid locale object handle.
+.PP
+The argument
+.I wc
+must be representable as a
+.I wchar_t
+and be a valid character in the locale or be the value
+.BR WEOF .
+.SH RETURN VALUE
+If
+.I wc
+was convertible to uppercase,
+.BR towupper ()
+returns its uppercase equivalent;
+otherwise it returns
+.IR wc .
+.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 towupper ()
+T}	Thread safety	MT-Safe locale
+T{
+.na
+.nh
+.BR towupper_l ()
+T}	Thread safety	MT-Safe
+.TE
+.sp 1
+.SH STANDARDS
+.TP
+.BR towupper ()
+C11, POSIX.1-2008 (XSI).
+.TP
+.BR towupper_l ()
+POSIX.1-2008.
+.SH HISTORY
+.TP
+.BR towupper ()
+C99, POSIX.1-2001 (XSI).
+Obsolete in POSIX.1-2008 (XSI).
+.TP
+.BR towupper_l ()
+POSIX.1-2008.
+glibc 2.3.
+.SH NOTES
+The behavior of these functions depends on the
+.B LC_CTYPE
+category of the locale.
+.PP
+These functions are not very appropriate for dealing with Unicode characters,
+because Unicode knows about three cases: upper, lower, and title case.
+.SH SEE ALSO
+.BR iswupper (3),
+.BR towctrans (3),
+.BR towlower (3),
+.BR locale (7)