strdup, strndup, strdupa, strndupa — duplicate a string
#include <string.h>
char
*strdup( |
const char * | s) ; |
#define _GNU_SOURCE #include <string.h>
char
*strndup( |
const char * | s, |
size_t | n) ; |
char
*strdupa( |
const char * | s) ; |
char
*strndupa( |
const char * | s, |
size_t | n) ; |
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).
The strdup
() function
returns a pointer to the duplicated string, or NULL if
insufficient memory was available.
strdup
() conforms to SVr4,
4.3BSD, POSIX.1-2001. strndup
(), strdupa
(), and strndupa
() are GNU extensions.
alloca(3), calloc(3), free(3), malloc(3), realloc(3), wcsdup(3), feature_test_macros(7)
|