.\" 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 and the American National Standards Committee X3,
.\" on Information Processing Systems.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    notice, this list of conditions and the following disclaimer in the
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.\" 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.
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\"     @(#)strcspn.3	8.1 (Berkeley) 6/4/93
.\" %FreeBSD: src/lib/libc/string/strcspn.3,v 1.3.2.4 2001/12/14 18:33:59 ru Exp %
.\"
.\" $FreeBSD$
.\"
.Dd June 4, 1993
.Dt STRCSPN 3
.Os
.Sh 名称
.Nm strcspn
.Nd 文字列の補集合の長さを測る
.Sh ライブラリ
.Lb libc
.Sh 書式
.In string.h
.Ft size_t
.Fn strcspn "const char *s" "const char *charset"
.Sh 解説
.Fn strcspn
関数は、ヌル文字で終了する文字列
.Fa s
から文字列
.Fa charset
にない文字列の長さだけ
.Fa s
の最初の部分の長さを測ります
.Fa ( charset
の
.Em 補集合
の長さを測ります)。
.Sh 戻り値
.Fn strcspn
関数は測られた文字の数を返します。
.Sh 関連項目
.Xr memchr 3 ,
.Xr strchr 3 ,
.Xr strpbrk 3 ,
.Xr strrchr 3 ,
.Xr strsep 3 ,
.Xr strspn 3 ,
.Xr strstr 3 ,
.Xr strtok 3
.Sh 規格
.Fn strcspn
関数は
.St -isoC
に適合しています。