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+.\" Copyright (c) 1990, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" 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. 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
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)strdup.3	8.1 (Berkeley) 6/9/93
+.\" $FreeBSD$
+.\"
+.Dd December 5, 2008
+.Dt STRDUP 3
+.Os
+.Sh NAME
+.Nm strdup ,
+.Nm strndup
+.Nd save a copy of a string
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In string.h
+.Ft char *
+.Fn strdup "const char *str"
+.Ft char *
+.Fn strndup "const char *str" "size_t len"
+.Sh DESCRIPTION
+The
+.Fn strdup
+function
+allocates sufficient memory for a copy
+of the string
+.Fa str ,
+does the copy, and returns a pointer to it.
+The pointer may subsequently be used as an
+argument to the function
+.Xr free 3 .
+.Pp
+If insufficient memory is available, NULL is returned and
+.Va errno
+is set to
+.Er ENOMEM .
+.Pp
+The
+.Fn strndup
+function copies at most
+.Fa len
+characters from the string
+.Fa str
+always
+.Dv NUL
+terminating the copied string.
+.Sh SEE ALSO
+.Xr free 3 ,
+.Xr malloc 3 ,
+.Xr wcsdup 3
+.Sh HISTORY
+The
+.Fn strdup
+function first appeared in
+.Bx 4.4 .
+The
+.Fn strndup
+function was added in
+.Fx 7.2 .