BLOCK
#define BLOCK 19 /* convert ASCII to blocked ASCII */
#define BLOCK 1 /* alternate superblock */
#define BLOCK 5 /* but must be different from */
#define BLOCK 1 /* block in aiowait */
BLOCK
#define BLOCK(d) ((TREE *)(((uintptr_t)(d)) - WORDSIZE))
#define BLOCK 256
#define BLOCK(d) ((TREE *)(((char *)(d)) - WORDSIZE))
#define BLOCK(n) { \
#define BLOCK 0
#define BLOCK 0