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

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.\" Copyright (c) 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" @(#)isupper.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
.Dd July 17, 2005
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.Dt ISUPPER 3
.Os
.Sh NAME
.Nm isupper
.Nd upper-case character test
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.In ctype.h
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.Ft int
.Fn isupper "int c"
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.Sh DESCRIPTION
The
.Fn isupper
function tests for any upper-case letter.
The value of the argument must be representable as an
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.Vt "unsigned char"
or the value of
.Dv EOF .
.Pp
In the ASCII character set, this includes the following characters
(with their numeric values shown in octal):
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.Pp
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.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
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.It "\&101\ ``A'' \t102\ ``B'' \t103\ ``C'' \t104\ ``D'' \t105\ ``E''"
.It "\&106\ ``F'' \t107\ ``G'' \t110\ ``H'' \t111\ ``I'' \t112\ ``J''"
.It "\&113\ ``K'' \t114\ ``L'' \t115\ ``M'' \t116\ ``N'' \t117\ ``O''"
.It "\&120\ ``P'' \t121\ ``Q'' \t122\ ``R'' \t123\ ``S'' \t124\ ``T''"
.It "\&125\ ``U'' \t126\ ``V'' \t127\ ``W'' \t130\ ``X'' \t131\ ``Y''"
.It "\&132\ ``Z''"
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.El
.Sh RETURN VALUES
The
.Fn isupper
function returns zero if the character tests false and
returns non-zero if the character tests true.
.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 iswupper
function should be used instead.
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.Sh SEE ALSO
.Xr ctype 3 ,
.Xr iswupper 3 ,
.Xr toupper 3 ,
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.Xr ascii 7
.Sh STANDARDS
The
.Fn isupper
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function conforms to
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.St -isoC .