SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
-#ifndef _DTLS_UTHASH_H
-#define _DTLS_UTHASH_H
+#ifndef UTHASH_H
+#define UTHASH_H
#include <string.h> /* memcmp,strlen */
#include <stddef.h> /* ptrdiff_t */
char **_da_dst = (char**)(&(dst)); \
*_da_dst = (char*)(src); \
} while(0)
-#else
+#else
#define DECLTYPE_ASSIGN(dst,src) \
do { \
(dst) = DECLTYPE(dst)(src); \
HASH_BLOOM_BITTEST((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1)))
#else
-#define HASH_BLOOM_MAKE(tbl)
-#define HASH_BLOOM_FREE(tbl)
-#define HASH_BLOOM_ADD(tbl,hashv)
+#define HASH_BLOOM_MAKE(tbl)
+#define HASH_BLOOM_FREE(tbl)
+#define HASH_BLOOM_ADD(tbl,hashv)
#define HASH_BLOOM_TEST(tbl,hashv) (1)
#endif
#define HASH_ADD(hh,head,fieldname,keylen_in,add) \
HASH_ADD_KEYPTR(hh,head,&add->fieldname,keylen_in,add)
-
+
#define HASH_ADD_KEYPTR(hh,head,keyptr,keylen_in,add) \
do { \
unsigned _ha_bkt; \
} \
} while (0)
#else
-#define HASH_FSCK(hh,head)
+#define HASH_FSCK(hh,head)
#endif
-/* When compiled with -DHASH_EMIT_KEYS, length-prefixed keys are emitted to
+/* When compiled with -DHASH_EMIT_KEYS, length-prefixed keys are emitted to
* the descriptor to which this macro is defined for tuning the hash function.
* The app can #include <unistd.h> to get the prototype for write(2). */
#ifdef HASH_EMIT_KEYS
write(HASH_EMIT_KEYS, &_klen, sizeof(_klen)); \
write(HASH_EMIT_KEYS, keyptr, fieldlen); \
} while (0)
-#else
-#define HASH_EMIT_KEY(hh,head,keyptr,fieldlen)
+#else
+#define HASH_EMIT_KEY(hh,head,keyptr,fieldlen)
#endif
/* default to Jenkin's hash unless overridden e.g. DHASH_FUNCTION=HASH_SAX */
-#ifdef HASH_FUNCTION
+#ifdef HASH_FUNCTION
#define HASH_FCN HASH_FUNCTION
#else
#define HASH_FCN HASH_JEN
} while (0)
-/* SAX/FNV/OAT/JEN hash functions are macro variants of those listed at
+/* SAX/FNV/OAT/JEN hash functions are macro variants of those listed at
* http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx */
#define HASH_SAX(key,keylen,num_bkts,hashv,bkt) \
do { \
hashv = (hashv * 16777619) ^ _hf_key[_fn_i]; \
bkt = hashv & (num_bkts-1); \
} while(0);
-
+
#define HASH_OAT(key,keylen,num_bkts,hashv,bkt) \
do { \
unsigned _ho_i; \
/* The MurmurHash exploits some CPU's (e.g. x86) tolerance for unaligned reads.
* For other types of CPU's (e.g. Sparc) an unaligned read causes a bus error.
* So MurmurHash comes in two versions, the faster unaligned one and the slower
- * aligned one. We only use the faster one on CPU's where we know it's safe.
+ * aligned one. We only use the faster one on CPU's where we know it's safe.
*
* Note the preprocessor built-in defines can be emitted using:
*
* gcc -m64 -dM -E - < /dev/null (on gcc)
* cc -## a.c (where a.c is a simple test file) (Sun Studio)
*/
-#if (defined(__i386__) || defined(__x86_64__))
+#if (defined(__i386__) || defined(__x86_64__))
#define HASH_MUR HASH_MUR_UNALIGNED
#else
#define HASH_MUR HASH_MUR_ALIGNED
#endif /* HASH_USING_NO_STRICT_ALIASING */
/* key comparison function; return 0 if keys equal */
-#define HASH_KEYCMP(a,b,len) memcmp(a,b,len)
+#define HASH_KEYCMP(a,b,len) memcmp(a,b,len)
/* iterate over items in a known bucket to find desired item */
#define HASH_FIND_IN_BKT(tbl,hh,head,keyptr,keylen_in,out) \
} \
if (hh_del->hh_next) { \
hh_del->hh_next->hh_prev = hh_del->hh_prev; \
- }
+ }
/* Bucket expansion has the effect of doubling the number of buckets
* and redistributing the items into the new buckets. Ideally the
* items will distribute more or less evenly into the new buckets
* (the extent to which this is true is a measure of the quality of
- * the hash function as it applies to the key domain).
- *
+ * the hash function as it applies to the key domain).
+ *
* With the items distributed into more buckets, the chain length
* (item count) in each bucket is reduced. Thus by expanding buckets
- * the hash keeps a bound on the chain length. This bounded chain
+ * the hash keeps a bound on the chain length. This bounded chain
* length is the essence of how a hash provides constant time lookup.
- *
+ *
* The calculation of tbl->ideal_chain_maxlen below deserves some
* explanation. First, keep in mind that we're calculating the ideal
* maximum chain length based on the *new* (doubled) bucket count.
* In fractions this is just n/b (n=number of items,b=new num buckets).
- * Since the ideal chain length is an integer, we want to calculate
+ * Since the ideal chain length is an integer, we want to calculate
* ceil(n/b). We don't depend on floating point arithmetic in this
* hash, so to calculate ceil(n/b) with integers we could write
- *
+ *
* ceil(n/b) = (n/b) + ((n%b)?1:0)
- *
+ *
* and in fact a previous version of this hash did just that.
* But now we have improved things a bit by recognizing that b is
* always a power of two. We keep its base 2 log handy (call it lb),
* so now we can write this with a bit shift and logical AND:
- *
+ *
* ceil(n/b) = (n>>lb) + ( (n & (b-1)) ? 1:0)
- *
+ *
*/
#define HASH_EXPAND_BUCKETS(tbl) \
do { \
/* This is an adaptation of Simon Tatham's O(n log(n)) mergesort */
-/* Note that HASH_SORT assumes the hash handle name to be hh.
+/* Note that HASH_SORT assumes the hash handle name to be hh.
* HASH_SRT was added to allow the hash handle name to be passed in. */
#define HASH_SORT(head,cmpfcn) HASH_SRT(hh,head,cmpfcn)
#define HASH_SRT(hh,head,cmpfcn) \
} \
} while (0)
-/* This function selects items from one hash into another hash.
- * The end result is that the selected items have dual presence
- * in both hashes. There is no copy of the items made; rather
- * they are added into the new hash through a secondary hash
+/* This function selects items from one hash into another hash.
+ * The end result is that the selected items have dual presence
+ * in both hashes. There is no copy of the items made; rather
+ * they are added into the new hash through a secondary hash
* hash handle that must be present in the structure. */
#define HASH_SELECT(hh_dst, dst, hh_src, src, cond) \
do { \
#ifdef NO_DECLTYPE
#define HASH_ITER(hh,head,el,tmp) \
for((el)=(head), (*(char**)(&(tmp)))=(char*)((head)?(head)->hh.next:NULL); \
- el; (el)=(tmp),(*(char**)(&(tmp)))=(char*)((tmp)?(tmp)->hh.next:NULL))
+ el; (el)=(tmp),(*(char**)(&(tmp)))=(char*)((tmp)?(tmp)->hh.next:NULL))
#else
#define HASH_ITER(hh,head,el,tmp) \
for((el)=(head),(tmp)=DECLTYPE(el)((head)?(head)->hh.next:NULL); \
#endif
/* obtain a count of items in the hash */
-#define HASH_COUNT(head) HASH_CNT(hh,head)
+#define HASH_COUNT(head) HASH_CNT(hh,head)
#define HASH_CNT(hh,head) ((head)?((head)->hh.tbl->num_items):0)
typedef struct UT_hash_bucket {
/* expand_mult is normally set to 0. In this situation, the max chain length
* threshold is enforced at its default value, HASH_BKT_CAPACITY_THRESH. (If
- * the bucket's chain exceeds this length, bucket expansion is triggered).
+ * the bucket's chain exceeds this length, bucket expansion is triggered).
* However, setting expand_mult to a non-zero value delays bucket expansion
* (that would be triggered by additions to this particular bucket)
* until its chain length reaches a *multiple* of HASH_BKT_CAPACITY_THRESH.
* multiplier is to reduce bucket expansions, since they are expensive, in
* situations where we know that a particular bucket tends to be overused.
* It is better to let its chain length grow to a longer yet-still-bounded
- * value, than to do an O(n) bucket expansion too often.
+ * value, than to do an O(n) bucket expansion too often.
*/
unsigned expand_mult;
* hash distribution; reaching them in a chain traversal takes >ideal steps */
unsigned nonideal_items;
- /* ineffective expands occur when a bucket doubling was performed, but
+ /* ineffective expands occur when a bucket doubling was performed, but
* afterward, more than half the items in the hash had nonideal chain
* positions. If this happens on two consecutive expansions we inhibit any
* further expansion, as it's not helping; this happens when the hash
projects / platform / upstream / iotivity.git / blobdiff