freebsd-dev/lib/libc/locale/toupper.3
2002-03-15 17:53:20 +00:00

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.\" @(#)toupper.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd June 4, 1993
.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 SEE ALSO
.Xr ctype 3 ,
.Xr isupper 3 ,
.Xr multibyte 3
.Sh STANDARDS
The
.Fn toupper
function conforms to
.St -isoC .