The NS_CStringCloneData function returns a null-terminated, heap allocated copy of the string's internal buffer.
#include "nsStringAPI.h"
char* NS_CStringCloneData(
const nsACString& aString
);
nsACString instance whose data is to be cloned. The NS_CStringCutData function returns a pointer to a null-terminated, heap allocated buffer on success. On failure it returns nsnull. The resulting buffer may be freed by calling nsMemory::Free.
This function was frozen for Mozilla 1.7. See bug 239716 for details.