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+.\" Copyright (c) 1989, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the American National Standards Committee X3, on Information
+.\" Processing Systems.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd December 19, 2022
+.Dt TOUPPER 3
+.Os
+.Sh NAME
+.Nm toupper ,
+.Nm toupper_l
+.Nd lower case to upper case letter conversion
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In ctype.h
+.Ft int
+.Fn toupper "int c"
+.Ft int
+.Fn toupper_l "int c" "locale_t loc"
+.Sh DESCRIPTION
+The
+.Fn toupper
+and
+.Fn toupper_l
+functions convert a lower-case letter to the corresponding
+upper-case letter.
+The argument must be representable as an
+.Vt "unsigned char"
+or the value of
+.Dv EOF .
+.Pp
+The
+.Fn toupper_l
+function takes an explicit locale argument, whereas the
+.Fn toupper
+function uses the current global or per-thread locale.
+.Sh RETURN VALUES
+If the argument is a lower-case letter, the
+.Fn toupper
+and
+.Fn toupper_l
+functions return the corresponding upper-case letter if there is
+one; otherwise, the argument is returned unchanged.
+.Sh COMPATIBILITY
+The
+.Bx 4.4
+extension of accepting arguments outside of the range of the
+.Vt "unsigned char"
+type in locales with large character sets is considered obsolete
+and may not be supported in future releases.
+The
+.Fn towupper
+or
+.Fn towupper_l
+function should be used instead.
+.Sh SEE ALSO
+.Xr ctype 3 ,
+.Xr ctype_l 3 ,
+.Xr isupper 3 ,
+.Xr isupper_l 3 ,
+.Xr towupper 3 ,
+.Xr towupper_l 3 ,
+.Xr xlocale 3
+.Sh STANDARDS
+The
+.Fn toupper
+function conforms to
+.St -isoC .