sys/libkern/zlib.c

391     Posf *head; /* Heads of the hash chains or NIL. */
650 #define NIL 0
729     s->head[s->hash_size-1] = NIL; \
1291         s->strstart - (IPos)MAX_DIST(s) : NIL;
1499                 *p = (Pos)(m >= wsize ? m-wsize : NIL);
1506                 *p = (Pos)(m >= wsize ? m-wsize : NIL);
1639     IPos hash_head = NIL; /* head of the hash chain */
1666         if (hash_head != NIL && s->strstart - hash_head <= MAX_DIST(s)) {
1732     IPos hash_head = NIL;    /* head of hash chain */
1762         if (hash_head != NIL && s->prev_length < s->max_lazy_match &&