.\" Copyright (c) 1989, 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.
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 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.
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.\"	@(#)toupper.3	8.1 (Berkeley) 6/4/93
.\" %FreeBSD: src/lib/libc/locale/toupper.3,v 1.5.2.5 2001/12/14 18:33:55 ru Exp %
.\" $FreeBSD$
.\"
.Dd June 4, 1993
.Dt TOUPPER 3
.Os
.Sh 名称
.Nm toupper
.Nd 小文字から大文字への変換
.Sh ライブラリ
.Lb libc
.Sh 書式
.In ctype.h
.Ft int
.Fn toupper "int c"
.Sh 解説
.Fn toupper
関数は小文字を対応する大文字へ変換します。
C 言語の
.Va char Ns s
型ひとつに関するロケール (
.Xr multibyte 3
参照 ) のことを考慮して、引数の値は
.Li unsigned char
または
.Dv EOF
の値として表されなければなりません。
.Sh 戻り値
引数が小文字である場合は、その文字に対応する大文字がある場合は
.Fn toupper
関数はそれを返します。それ以外の場合は、その引数が変更されないまま返されます。
.Sh 関連項目
.Xr isalnum 3 ,
.Xr isalpha 3 ,
.Xr isascii 3 ,
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr isgraph 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isspace 3 ,
.Xr isupper 3 ,
.Xr isxdigit 3 ,
.Xr multibyte 3 ,
.Xr stdio 3 ,
.Xr toascii 3 ,
.Xr tolower 3 ,
.Xr ascii 7
.Sh 規格
.Fn toupper
関数は
.St -isoC
に準拠しています。