Miscellany

void *nmalloc(size_t nbytes){        void *ptr = ( nbytes == 0 ) ? NULL : calloc( nbytes, sizeof( void * ) ) ;        if(!ptr)                fatal("out of memory");        return ptr;}void *nrealloc(void *p, size_t nb){        void *newp = ( nb == 0 ) ? NULL : realloc(p, nb);        if(!newp)                fatal("out of memory");        return newp;}void nfree(void *ptr){#ifdef DEBUG        static void *last_ptr = NULL;#endif        if(ptr == NULL)                return;#ifdef DEBUG        if(last_ptr == ptr)                fatal("internal error: attempting to free same pointer twice");        else#endif        if(ptr)                free(ptr);}