.\" Copyright (c) 1990, 1991, 1993
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.\"     @(#)strdup.3	8.1 (Berkeley) 6/9/93
.\" %FreeBSD: src/lib/libc/string/strdup.3,v 1.7.2.2 2001/12/14 18:33:59 ru Exp %
.\" $FreeBSD$
.\"
.Dd June 9, 1993
.Dt STRDUP 3
.Os
.Sh 名称
.Nm strdup
.Nd 文字列のコピーを保存
.Sh ライブラリ
.Lb libc
.Sh 書式
.In string.h
.Ft char *
.Fn strdup "const char *str"
.Sh 解説
.Fn strdup
関数は、文字列
.Fa str
のコピーのために十分なメモリを割り当て、コピーを行い、
コピーへのポインタを返します。ポインタは後で関数
.Xr free 3
の引数として使ってください。
.Pp
利用可能なメモリが十分ではない場合、NULL を返します。
.Sh 関連項目
.Xr free 3 ,
.Xr malloc 3
.Sh 歴史
.Fn strdup
関数は、
.Bx 4.4
ではじめて登場しました。