xref: /freebsd/lib/libc/string/strdup.3 (revision 8e537d168674d6b65869f73c20813001af875738)
1.\" Copyright (c) 1990, 1991, 1993
2.\"	The Regents of the University of California.  All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\"    notice, this list of conditions and the following disclaimer.
9.\" 2. Redistributions in binary form must reproduce the above copyright
10.\"    notice, this list of conditions and the following disclaimer in the
11.\"    documentation and/or other materials provided with the distribution.
12.\" 3. All advertising materials mentioning features or use of this software
13.\"    must display the following acknowledgement:
14.\"	This product includes software developed by the University of
15.\"	California, Berkeley and its contributors.
16.\" 4. Neither the name of the University nor the names of its contributors
17.\"    may be used to endorse or promote products derived from this software
18.\"    without specific prior written permission.
19.\"
20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\"     @(#)strdup.3	8.1 (Berkeley) 6/9/93
33.\"	$Id$
34.\"
35.Dd June 9, 1993
36.Dt STRDUP 3
37.Os
38.Sh NAME
39.Nm strdup
40.Nd save a copy of a string
41.Sh SYNOPSIS
42.Fd #include <string.h>
43.Ft char *
44.Fn strdup "const char *str"
45.Sh DESCRIPTION
46The
47.Fn strdup
48function
49allocates sufficient memory for a copy
50of the string
51.Fa str ,
52does the copy, and returns a pointer to it.
53The pointer may subsequently be used as an
54argument to the function
55.Xr free 3 .
56.Pp
57If insufficient memory is available, NULL is returned.
58.Sh SEE ALSO
59.Xr malloc 3 ,
60.Xr free 3
61.Sh HISTORY
62The
63.Fn strdup
64function first appeared in
65.Bx 4.4 .
66