xref: /minix3/lib/libc/gen/isupper.3 (revision 2fe8fb192fe7e8720e3e7a77f928da545e872a6a)

.\"	$NetBSD: isupper.3,v 1.14 2008/04/17 16:25:36 apb Exp $
.\"
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.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
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.\"     @(#)isupper.3	5.2 (Berkeley) 6/29/91
.\"
.Dd April 17, 2008
.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 or any of an
implementation-defined set of characters for which none of
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr ispunct 3 ,
or
.Xr isspace 3
is true.
In the
.Em ``C''
locale,
.Fn isupper
returns true only for the characters defined as upper-case letters.
.Sh RETURN VALUES
The
.Fn isupper
function returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr isalnum 3 ,
.Xr isalpha 3 ,
.Xr isascii 3 ,
.Xr isblank 3 ,
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr isgraph 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isspace 3 ,
.Xr isxdigit 3 ,
.Xr stdio 3 ,
.Xr toascii 3 ,
.Xr tolower 3 ,
.Xr toupper 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn isupper
function conforms to
.St -ansiC .
.Sh CAVEATS
The argument to
.Fn isupper
must be
.Dv EOF
or representable as an
.Vt unsigned char ;
otherwise, the behavior is undefined.
See the
.Sx CAVEATS
section of
.Xr ctype 3
for more details.