void *xrealloc_f (void *o, size_t size, char *file, int line);
void *xmalloc_f (size_t size, char *file, int line);
void *xcalloc_f (size_t nmemb, size_t size, char *file, int line);
void *xrealloc_f (void *o, size_t size, char *file, int line);
void *xmalloc_f (size_t size, char *file, int line);
void *xcalloc_f (size_t nmemb, size_t size, char *file, int line);