+/* Number of Lisp_Objects at the beginning of struct buffer.
+ If you add, remove, or reorder Lisp_Objects within buffer
+ structure, make sure that this is still correct. */
+
+#define BUFFER_LISP_SIZE \
+ ((offsetof (struct buffer, own_text) - header_size) / word_size)
+
+/* Size of the struct buffer part beyond leading Lisp_Objects, in word_size
+ units. Rounding is needed for --with-wide-int configuration. */
+
+#define BUFFER_REST_SIZE \
+ ((((sizeof (struct buffer) - offsetof (struct buffer, own_text)) \
+ + (word_size - 1)) & ~(word_size - 1)) / word_size)
+
+/* Initialize the pseudovector header of buffer object. BUFFER_LISP_SIZE
+ is required for GC, but BUFFER_REST_SIZE is set up just to be consistent
+ with other pseudovectors. */
+
+#define BUFFER_PVEC_INIT(b) \
+ XSETPVECTYPESIZE (b, PVEC_BUFFER, BUFFER_LISP_SIZE, BUFFER_REST_SIZE)
+
+/* Convenient check whether buffer B is live. */
+
+#define BUFFER_LIVE_P(b) (!NILP (BVAR (b, name)))
+
+/* Convenient check whether buffer B is hidden (i.e. its name
+ starts with a space). Caller must ensure that B is live. */
+
+#define BUFFER_HIDDEN_P(b) (SREF (BVAR (b, name), 0) == ' ')
+
+/* Verify indirection counters. */
+
+#define BUFFER_CHECK_INDIRECTION(b) \
+ do { \
+ if (BUFFER_LIVE_P (b)) \
+ { \
+ if (b->base_buffer) \
+ { \
+ eassert (b->indirections == -1); \
+ eassert (b->base_buffer->indirections > 0); \
+ } \
+ else \
+ eassert (b->indirections >= 0); \
+ } \
+ } while (0)
+