minix/lib/libc/gen/isupper.3

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.\" $NetBSD: isupper.3,v 1.14 2008/04/17 16:25:36 apb Exp $
.\"
.\" Copyright (c) 1991 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.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" notice, this list of conditions and the following disclaimer in the
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.\" 3. 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.
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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.