.\"	$NetBSD: toupper.3,v 1.17 2008/04/17 16:25:36 apb Exp $
.\"
.\" Copyright (c) 1989, 1991 The Regents of the University of California.
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.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
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.\"	@(#)toupper.3	5.2 (Berkeley) 6/29/91
.\"
.Dd April 17, 2008
.Dt TOUPPER 3
.Os
.Sh NAME
.Nm toupper
.Nd lower case to upper case letter conversion
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn toupper "int c"
.Sh DESCRIPTION
The
.Fn toupper
function converts a lower-case letter to the corresponding
upper-case letter.
.Sh RETURN VALUES
If the argument is a lower-case letter, the
.Fn toupper
function returns the corresponding upper-case letter if there is
one; otherwise the argument is returned unchanged.
.\" In the
.\" .Em ``C''
.\" locale,
.\" .Fn toupper
.\" maps only the characters for which
.\" .Xr islower
.\" is true to the corresponding characters for which
.\" .Xr isupper
.\" is true.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr isalnum 3 ,
.Xr isalpha 3 ,
.Xr isascii 3 ,
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr isgraph 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isspace 3 ,
.Xr isupper 3 ,
.Xr isxdigit 3 ,
.Xr stdio 3 ,
.Xr toascii 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn toupper
function conforms to
.St -ansiC .
.Sh CAVEATS
The argument to
.Fn toupper
must be
.Dv EOF
or representable as an
.Vt unsigned char ;
otherwise, the behavior is undefined.
See the
.Sx CAVEATS
section of
.Xr ctype 3
for more details.