Libc-594.9.5.tar.gz

[apple/libc.git] / locale / FreeBSD / toupper.3

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.\"	@(#)toupper.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD: src/lib/libc/locale/toupper.3,v 1.16 2004/08/21 07:37:08 tjr Exp $
.\"
.Dd August 21, 2004
.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.
For single C
.Va char Ns s
locales (see
.Xr multibyte 3 )
the value of the argument is
representable as an
.Li unsigned char
or the value of
.Dv EOF .
.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.
.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
function should be used instead.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr isupper 3 ,
.Xr multibyte 3 ,
.Xr towupper 3
.Sh STANDARDS
The
.Fn toupper
function conforms to
.St -isoC .