NAME
strdup, strndup, strdupa, strndupa - duplicate a string
SYNOPSIS
#include <string.h>
I char *strdup(const char * s );
#define _GNU_SOURCE
#include <string.h>
I char *strndup(const char * s , size_t n );
I char *strdupa(const char * s );
I char *strndupa(const char * s , size_t n );
DESCRIPTION
The
R 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
R 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.
R strdupa ()
and
R 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
R strdup ()
function returns a pointer to the duplicated
string, or NULL if insufficient memory was available.
ERRORS
ENOMEM
Insufficient memory available to allocate duplicate string.
CONFORMING TO
R strdup ()
conforms to SVr4, 4.3BSD, POSIX.1-2001.
R strndup (),
R strdupa (),
and
R strndupa ()
are GNU extensions.
SEE ALSO
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