freebsd-dev/lib/libc/locale/isupper.3
Tim J. Robbins 0db74aa4a9 Re-word the COMPATIBILITY section, taking care to use the word "deprecated"
to describe the 4.4BSD extension of accepting arguments outside the range
of unsigned char. This gives us freedom to remove this extension when we
remove the <rune.h> interface in FreeBSD 6.
2004-07-29 23:32:41 +00:00

100 lines
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.\" @(#)isupper.3 8.1 (Berkeley) 6/4/93
.\" $FreeBSD$
.\"
.Dd July 30, 2004
.Dt ISUPPER 3
.Os
.Sh NAME
.Nm isupper
.Nd upper-case character test
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn isupper "int c"
.Sh DESCRIPTION
The
.Fn isupper
function tests for any 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 .
In the ASCII character set, this includes the following characters
(with their numeric values shown in octal):
.Pp
.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
.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''"
.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 deprecated.
The
.Fn iswupper
function should be used instead for maximum portability.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr iswupper 3 ,
.Xr multibyte 3 ,
.Xr toupper 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn isupper
function conforms to
.St -isoC .