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+PL_strdup
+=========
+
+Returns a pointer to a new memory node in the NSPR heap containing a
+copy of a specified string.
+
+
+Syntax
+~~~~~~
+
+.. code::
+
+   #include <plstr.h>
+
+   char *PL_strdup(const char *s);
+
+
+Parameter
+~~~~~~~~~
+
+The function has a single parameter:
+
+``s``
+   The string to copy, may be ``NULL``.
+
+
+Returns
+~~~~~~~
+
+The function returns one of these values:
+
+-  If successful, a pointer to a copy of the specified string.
+-  If the memory allocation fails, ``NULL``.
+
+
+Description
+~~~~~~~~~~~
+
+To accommodate the terminator, the size of the allocated memory is one
+greater than the length of the string being copied. A ``NULL`` argument,
+like a zero-length argument, results in a pointer to a one-byte block of
+memory containing the null value.
+
+Notes
+~~~~~
+
+The memory allocated by :ref:`PL_strdup` should be freed with
+`PL_strfree </en/PL_strfree>`__.