.\" Copyright (c) 1990, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek.
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 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.
.\" 3. All advertising materials mentioning features or use of this software
.\"    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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\"
.\"     @(#)strcasecmp.3	8.1 (Berkeley) 6/9/93
.\" %FreeBSD: src/lib/libc/string/strcasecmp.3,v 1.6.2.3 2001/12/14 18:33:59 ru Exp %
.\" $FreeBSD$
.\"
.Dd June 9, 1993
.Dt STRCASECMP 3
.Os
.Sh 名称
.Nm strcasecmp ,
.Nm strncasecmp
.Nd 大文字小文字を無視した文字列の比較
.Sh ライブラリ
.Lb libc
.Sh 書式
.In string.h
.Ft int
.Fn strcasecmp "const char *s1" "const char *s2"
.Ft int
.Fn strncasecmp "const char *s1" "const char *s2" "size_t len"
.Sh 解説
.Fn strcasecmp
および
.Fn strncasecmp
関数は、ヌル文字で終了する文字列
.Fa s1
および
.Fa s2
を比較します。
.Pp
.Fn strncasecmp
は、最大で
.Fa len
個の文字を比較します。
.Sh 戻り値
.Fn strcasecmp
および
.Fn strncasecmp
は、それぞれの文字を小文字に変換した後に
.Fa s1
が
.Fa s2
よりも辞書式順序で大きいか、等しいか、あるいは小さいかに応じて、
それぞれ、0 より大きい、0 に等しい、
あるいは 0 より小さい整数を返します。
文字列自体は修正されません。比較は、
.Sq Li \e200
が
.Ql \e0
よりも大きくなるように、unsigned char を使って行います。
.Sh 関連項目
.Xr bcmp 3 ,
.Xr memcmp 3 ,
.Xr strcmp 3 ,
.Xr strcoll 3 ,
.Xr strxfrm 3 ,
.Xr tolower 3
.Sh 歴史
.Fn strcasecmp
および
.Fn strncasecmp
関数は、
.Bx 4.4
ではじめて登場しました。