Name
strdup, strndup, strdupa, strndupa — duplicate a string
Synopsis
#include <string.h>
char
*strdup( |
const char * | s); |
char
*strndup( |
const char * | s, |
| size_t | n); |
char
*strdupa( |
const char * | s); |
char
*strndupa( |
const char * | s, |
| size_t | n); |
![[Note]](../stylesheet/note.png) |
Note | ||||
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DESCRIPTION
The strdup() function
returns a pointer to a new string which is a duplicate of the
string s. Memory for
the new string is obtained with malloc(3), and can be freed
with free(3).
The strndup() function is
similar, but only copies at most n characters. If s is longer than n, only n characters are copied, and a
terminating null byte ('\0') is added.
strdupa() and strndupa() are similar, but use alloca(3) to allocate the
buffer. They are only available when using the GNU GCC suite,
and suffer from the same limitations described in alloca(3).
RETURN VALUE
The strdup() function
returns a pointer to the duplicated string, or NULL if
insufficient memory was available.
CONFORMING TO
strdup() conforms to SVr4,
4.3BSD, POSIX.1-2001. strndup(), strdupa(), and strndupa() are GNU extensions.
COLOPHON
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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Copyright 1993 David Metcalfe (davidprism.demon.co.uk) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. References consulted: Linux libc source code Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) 386BSD man pages Modified Sun Jul 25 10:41:34 1993 by Rik Faith (faithcs.unc.edu) Modified Wed Oct 17 01:12:26 2001 by John Levon <mozcompsoc.man.ac.uk> |