b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
109 lines
3 KiB
Groff
109 lines
3 KiB
Groff
.\" 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.
|
|
.\"
|
|
.\" from: @(#)strdup.3 8.1 (Berkeley) 6/9/93
|
|
.\" $NetBSD: strdup.3,v 1.18 2009/01/29 10:15:39 wiz Exp $
|
|
.\"
|
|
.Dd January 28, 2009
|
|
.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,
|
|
.Dv NULL
|
|
is returned.
|
|
.Pp
|
|
The
|
|
.Fn strndup
|
|
function copies at most
|
|
.Fa len
|
|
characters from the string
|
|
.Fa str
|
|
always
|
|
.Dv NUL
|
|
terminating the copied string.
|
|
.Sh EXAMPLES
|
|
The following will point
|
|
.Va p
|
|
to an allocated area of memory containing the nul-terminated string
|
|
.Qq foobar :
|
|
.Bd -literal -offset indent
|
|
char *p;
|
|
|
|
if ((p = strdup("foobar")) == NULL) {
|
|
fprintf(stderr, "Out of memory.\en");
|
|
exit(1);
|
|
}
|
|
.Ed
|
|
.Sh ERRORS
|
|
The
|
|
.Fn strdup
|
|
function may fail and set the external variable
|
|
.Va errno
|
|
for any of the errors specified for the library function
|
|
.Xr malloc 3 .
|
|
.Sh SEE ALSO
|
|
.Xr free 3 ,
|
|
.Xr malloc 3 ,
|
|
.Xr strcpy 3 ,
|
|
.Xr strlen 3
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn strdup
|
|
function conforms to
|
|
.St -p1003.1-2001 .
|
|
.Sh HISTORY
|
|
The
|
|
.Fn strdup
|
|
function first appeared in
|
|
.Bx 4.4 .
|
|
The
|
|
.Fn strndup
|
|
function was added in
|
|
.Nx 4.0 .
|