typedef struct {	mem_pool_t *pool;	void *data;	int sz;	int next_pow2;}buf_t; buf_t *buf_alloc(mem_pool_t *pool) gnuc_attr(nonnull(1), malloc);int buf_write(buf_t *b, const void *data, int sz) gnuc_attr(nonnull(1, 2));int buf_puts(buf_t *b, const char *s) gnuc_attr(nonnull(1, 2));void buf_clear(buf_t *b) gnuc_attr(nonnull(1));void buf_free(buf_t *b) gnuc_attr(nonnull(1));