.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
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.\" 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  2014-01-22 "GNU" "Linux Programmer's Manual"
.SH NAME
towupper \- convert a wide character to uppercase
.SH SYNOPSIS
.nf
.B #include <wctype.h>
.sp
.BI "wint_t towupper(wint_t " wc );
.fi
.SH DESCRIPTION
The
.BR towupper ()
function is the wide-character equivalent of the
.BR toupper (3)
function.
If
.I wc
is a wide character, it is converted to
uppercase.
Characters which do not have case are returned unchanged.
If
.IR wc
is
.BR WEOF ,
.B WEOF
is returned.
.SH RETURN VALUE
The
.BR towupper ()
function returns the uppercase equivalent of
.IR wc ,
or
.BR WEOF
if
.I wc
is
.BR WEOF .
.SH ATTRIBUTES
.SS Multithreading (see pthreads(7))
The
.BR towupper ()
function is thread-safe with exceptions.
It can be safely used in multithreaded applications, as long as
.BR setlocale (3)
is not called to change the locale during its execution.
.SH CONFORMING TO
C99.
.SH NOTES
The behavior of
.BR towupper ()
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 iswupper (3),
.BR towctrans (3),
.BR towlower (3)