freebsd-dev/lib/libc/locale/toupper.3

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.\" Copyright (c) 1989, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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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 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
.Dd July 25, 2010
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.Dt TOUPPER 3
.Os
.Sh NAME
.Nm toupper
.Nd lower case to upper case letter conversion
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.In ctype.h
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.Ft int
.Fn toupper "int c"
.Sh DESCRIPTION
The
.Fn toupper
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function converts a lower-case letter to the corresponding
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upper-case letter.
The argument must be representable as an
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.Vt "unsigned char"
or the value of
.Dv EOF .
.Sh RETURN VALUES
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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.
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.Sh SEE ALSO
.Xr ctype 3 ,
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.Xr isupper 3 ,
.Xr towupper 3
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.Sh STANDARDS
The
.Fn toupper
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function conforms to
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.St -isoC .