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+.\" (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
+.\"
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\" 
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\" 
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\" License.
+.\" Modified Sat Jul 24 17:45:39 1993 by Rik Faith (faith@cs.unc.edu)
+.\" Modified 2000-02-13 by Nicolás Lichtmaier <nick@debian.org>
+.TH TOUPPER 3  1993-04-04 "GNU" "Linux Programmer's Manual"
+.SH NAME
+toupper, tolower \- convert letter to upper or lower case
+.SH SYNOPSIS
+.nf
+.B #include <ctype.h>
+.sp
+.BI "int toupper(int " "c" );
+.nl
+.BI "int tolower(int " "c" );
+.fi
+.SH DESCRIPTION
+.B toupper()
+converts the letter
+.I c
+to upper case, if possible.
+.PP
+.B tolower()
+converts the letter
+.I c
+to lower case, if possible.
+.PP
+If
+.I c
+is not an unsigned char value, or EOF, the behaviour of these functions
+is undefined.
+.SH "RETURN VALUE"
+The value returned is that of the converted letter, or
+.I c
+if the conversion was not possible.
+.SH "CONFORMING TO"
+ANSI C, BSD 4.3
+.SH BUGS
+The details of what constitutes an uppercase or lowercase letter depend
+on the current locale.  For example, the default
+.B """C"""
+locale does not know about umlauts, so no conversion is done for them.
+.PP
+In some non - English locales, there are lowercase letters with no
+corresponding uppercase equivalent; the German sharp s is one
+example.
+.SH "SEE ALSO"
+.BR isalpha (3),
+.BR setlocale (3),
+.BR locale (7)