@code{alloca}.
For obvious reasons @code{strdupa} is implemented only as a macro. I.e.,
-you cannot get the address of this function. Despite this limitations
+you cannot get the address of this function. Despite this limitation
it is a useful function. The following code shows a situation where
using @code{malloc} would be a lot more expensive.
@end smallexample
Please note that calling @code{strtok} using @var{path} directly is
-illegal.
+invalid.
This function is only available if GNU CC is used.
@end deftypefun