Merging upstream version 1:9.16.48.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

20 files changed, 562 insertions, 204 deletions

diff --git a/lib/isc/ht.c b/lib/isc/ht.c
index 07a36b4..e11050f 100644
--- a/lib/isc/ht.c
+++ b/lib/isc/ht.c
@@ -27,51 +27,274 @@ typedef struct isc_ht_node isc_ht_node_t;
 #define ISC_HT_MAGIC	 ISC_MAGIC('H', 'T', 'a', 'b')
 #define ISC_HT_VALID(ht) ISC_MAGIC_VALID(ht, ISC_HT_MAGIC)
 
+#define HT_NO_BITS    0
+#define HT_MIN_BITS   1
+#define HT_MAX_BITS   32
+#define HT_OVERCOMMIT 3
+
+#define HT_NEXTTABLE(idx)      ((idx == 0) ? 1 : 0)
+#define TRY_NEXTTABLE(idx, ht) (idx == ht->hindex && rehashing_in_progress(ht))
+
+#define GOLDEN_RATIO_32 0x61C88647
+
+#define HASHSIZE(bits) (UINT64_C(1) << (bits))
+
 struct isc_ht_node {
 	void *value;
 	isc_ht_node_t *next;
+	uint32_t hashval;
 	size_t keysize;
-	unsigned char key[FLEXIBLE_ARRAY_MEMBER];
+	unsigned char key[];
 };
 
 struct isc_ht {
 	unsigned int magic;
 	isc_mem_t *mctx;
-	size_t size;
-	size_t mask;
-	unsigned int count;
-	isc_ht_node_t **table;
+	size_t count;
+	bool case_sensitive;
+	size_t size[2];
+	uint8_t hashbits[2];
+	isc_ht_node_t **table[2];
+	uint8_t hindex;
+	uint32_t hiter; /* rehashing iterator */
 };
 
 struct isc_ht_iter {
 	isc_ht_t *ht;
 	size_t i;
+	uint8_t hindex;
 	isc_ht_node_t *cur;
 };
 
+static isc_ht_node_t *
+isc__ht_find(const isc_ht_t *ht, const unsigned char *key,
+	     const uint32_t keysize, const uint32_t hashval, const uint8_t idx);
+static void
+isc__ht_add(isc_ht_t *ht, const unsigned char *key, const uint32_t keysize,
+	    const uint32_t hashval, const uint8_t idx, void *value);
+static isc_result_t
+isc__ht_delete(isc_ht_t *ht, const unsigned char *key, const uint32_t keysize,
+	       const uint32_t hashval, const uint8_t idx);
+
+static uint32_t
+rehash_bits(isc_ht_t *ht, size_t newcount);
+
+static void
+hashtable_new(isc_ht_t *ht, const uint8_t idx, const uint8_t bits);
+static void
+hashtable_free(isc_ht_t *ht, const uint8_t idx);
+static void
+hashtable_rehash(isc_ht_t *ht, uint32_t newbits);
+static void
+hashtable_rehash_one(isc_ht_t *ht);
+static void
+maybe_rehash(isc_ht_t *ht, size_t newcount);
+
+static isc_result_t
+isc__ht_iter_next(isc_ht_iter_t *it);
+
+static uint8_t maptolower[] = {
+	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
+	0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23,
+	0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
+	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
+	0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
+	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73,
+	0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
+	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b,
+	0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
+	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83,
+	0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
+	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b,
+	0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
+	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3,
+	0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
+	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb,
+	0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
+	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3,
+	0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
+	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb,
+	0xfc, 0xfd, 0xfe, 0xff
+};
+
+static int
+memcasecmp(const void *vs1, const void *vs2, size_t len) {
+	uint8_t const *s1 = vs1;
+	uint8_t const *s2 = vs2;
+	for (size_t i = 0; i < len; i++) {
+		uint8_t u1 = s1[i];
+		uint8_t u2 = s2[i];
+		int U1 = maptolower[u1];
+		int U2 = maptolower[u2];
+		int diff = U1 - U2;
+		if (diff) {
+			return diff;
+		}
+	}
+	return 0;
+}
+
+static bool
+isc__ht_node_match(isc_ht_node_t *node, const uint32_t hashval,
+		   const uint8_t *key, uint32_t keysize, bool case_sensitive) {
+	return (node->hashval == hashval && node->keysize == keysize &&
+		(case_sensitive ? (memcmp(node->key, key, keysize) == 0)
+				: (memcasecmp(node->key, key, keysize) == 0)));
+}
+
+static uint32_t
+hash_32(uint32_t val, unsigned int bits) {
+	REQUIRE(bits <= HT_MAX_BITS);
+	/* High bits are more random. */
+	return (val * GOLDEN_RATIO_32 >> (32 - bits));
+}
+
+static bool
+rehashing_in_progress(const isc_ht_t *ht) {
+	return (ht->table[HT_NEXTTABLE(ht->hindex)] != NULL);
+}
+
+static bool
+hashtable_is_overcommited(isc_ht_t *ht) {
+	return (ht->count >= (ht->size[ht->hindex] * HT_OVERCOMMIT));
+}
+
+static uint32_t
+rehash_bits(isc_ht_t *ht, size_t newcount) {
+	uint32_t newbits = ht->hashbits[ht->hindex];
+
+	while (newcount >= HASHSIZE(newbits) && newbits <= HT_MAX_BITS) {
+		newbits += 1;
+	}
+
+	return (newbits);
+}
+
+/*
+ * Rebuild the hashtable to reduce the load factor
+ */
+static void
+hashtable_rehash(isc_ht_t *ht, uint32_t newbits) {
+	uint8_t oldindex = ht->hindex;
+	uint32_t oldbits = ht->hashbits[oldindex];
+	uint8_t newindex = HT_NEXTTABLE(oldindex);
+
+	REQUIRE(ht->hashbits[oldindex] >= HT_MIN_BITS);
+	REQUIRE(ht->hashbits[oldindex] <= HT_MAX_BITS);
+	REQUIRE(ht->table[oldindex] != NULL);
+
+	REQUIRE(newbits <= HT_MAX_BITS);
+	REQUIRE(ht->hashbits[newindex] == HT_NO_BITS);
+	REQUIRE(ht->table[newindex] == NULL);
+
+	REQUIRE(newbits > oldbits);
+
+	hashtable_new(ht, newindex, newbits);
+
+	ht->hindex = newindex;
+
+	hashtable_rehash_one(ht);
+}
+
+static void
+hashtable_rehash_one(isc_ht_t *ht) {
+	isc_ht_node_t **newtable = ht->table[ht->hindex];
+	uint32_t oldsize = ht->size[HT_NEXTTABLE(ht->hindex)];
+	isc_ht_node_t **oldtable = ht->table[HT_NEXTTABLE(ht->hindex)];
+	isc_ht_node_t *node = NULL;
+	isc_ht_node_t *nextnode;
+
+	/* Find first non-empty node */
+	while (ht->hiter < oldsize && oldtable[ht->hiter] == NULL) {
+		ht->hiter++;
+	}
+
+	/* Rehashing complete */
+	if (ht->hiter == oldsize) {
+		hashtable_free(ht, HT_NEXTTABLE(ht->hindex));
+		ht->hiter = 0;
+		return;
+	}
+
+	/* Move the first non-empty node from old hashtable to new hashtable */
+	for (node = oldtable[ht->hiter]; node != NULL; node = nextnode) {
+		uint32_t hash = hash_32(node->hashval,
+					ht->hashbits[ht->hindex]);
+		nextnode = node->next;
+		node->next = newtable[hash];
+		newtable[hash] = node;
+	}
+
+	oldtable[ht->hiter] = NULL;
+
+	ht->hiter++;
+}
+
+static void
+maybe_rehash(isc_ht_t *ht, size_t newcount) {
+	uint32_t newbits = rehash_bits(ht, newcount);
+
+	if (ht->hashbits[ht->hindex] < newbits && newbits <= HT_MAX_BITS) {
+		hashtable_rehash(ht, newbits);
+	}
+}
+
+static void
+hashtable_new(isc_ht_t *ht, const uint8_t idx, const uint8_t bits) {
+	size_t size;
+	REQUIRE(ht->hashbits[idx] == HT_NO_BITS);
+	REQUIRE(ht->table[idx] == NULL);
+	REQUIRE(bits >= HT_MIN_BITS);
+	REQUIRE(bits <= HT_MAX_BITS);
+
+	ht->hashbits[idx] = bits;
+	ht->size[idx] = HASHSIZE(ht->hashbits[idx]);
+
+	size = ht->size[idx] * sizeof(isc_ht_node_t *);
+
+	ht->table[idx] = isc_mem_get(ht->mctx, size);
+	memset(ht->table[idx], 0, size);
+}
+
+static void
+hashtable_free(isc_ht_t *ht, const uint8_t idx) {
+	size_t size = ht->size[idx] * sizeof(isc_ht_node_t *);
+
+	for (size_t i = 0; i < ht->size[idx]; i++) {
+		isc_ht_node_t *node = ht->table[idx][i];
+		while (node != NULL) {
+			isc_ht_node_t *next = node->next;
+			ht->count--;
+			isc_mem_put(ht->mctx, node,
+				    sizeof(*node) + node->keysize);
+			node = next;
+		}
+	}
+
+	isc_mem_put(ht->mctx, ht->table[idx], size);
+	ht->hashbits[idx] = HT_NO_BITS;
+	ht->table[idx] = NULL;
+}
+
 void
-isc_ht_init(isc_ht_t **htp, isc_mem_t *mctx, uint8_t bits) {
+isc_ht_init(isc_ht_t **htp, isc_mem_t *mctx, uint8_t bits,
+	    unsigned int options) {
 	isc_ht_t *ht = NULL;
-	size_t i;
+	bool case_sensitive = ((options & ISC_HT_CASE_INSENSITIVE) == 0);
 
 	REQUIRE(htp != NULL && *htp == NULL);
 	REQUIRE(mctx != NULL);
-	REQUIRE(bits >= 1 && bits <= (sizeof(size_t) * 8 - 1));
+	REQUIRE(bits >= 1 && bits <= HT_MAX_BITS);
 
-	ht = isc_mem_get(mctx, sizeof(struct isc_ht));
+	ht = isc_mem_get(mctx, sizeof(*ht));
+	*ht = (isc_ht_t){
+		.case_sensitive = case_sensitive,
+	};
 
-	ht->mctx = NULL;
 	isc_mem_attach(mctx, &ht->mctx);
 
-	ht->size = ((size_t)1 << bits);
-	ht->mask = ((size_t)1 << bits) - 1;
-	ht->count = 0;
-
-	ht->table = isc_mem_get(ht->mctx, ht->size * sizeof(isc_ht_node_t *));
-
-	for (i = 0; i < ht->size; i++) {
-		ht->table[i] = NULL;
-	}
+	hashtable_new(ht, 0, bits);
 
 	ht->magic = ISC_HT_MAGIC;
 
@@ -81,128 +304,186 @@ isc_ht_init(isc_ht_t **htp, isc_mem_t *mctx, uint8_t bits) {
 void
 isc_ht_destroy(isc_ht_t **htp) {
 	isc_ht_t *ht;
-	size_t i;
 
 	REQUIRE(htp != NULL);
+	REQUIRE(ISC_HT_VALID(*htp));
 
 	ht = *htp;
 	*htp = NULL;
-
-	REQUIRE(ISC_HT_VALID(ht));
-
 	ht->magic = 0;
 
-	for (i = 0; i < ht->size; i++) {
-		isc_ht_node_t *node = ht->table[i];
-		while (node != NULL) {
-			isc_ht_node_t *next = node->next;
-			ht->count--;
-			isc_mem_put(ht->mctx, node,
-				    offsetof(isc_ht_node_t, key) +
-					    node->keysize);
-			node = next;
+	for (size_t i = 0; i <= 1; i++) {
+		if (ht->table[i] != NULL) {
+			hashtable_free(ht, i);
 		}
 	}
 
 	INSIST(ht->count == 0);
 
-	isc_mem_put(ht->mctx, ht->table, ht->size * sizeof(isc_ht_node_t *));
-	isc_mem_putanddetach(&ht->mctx, ht, sizeof(struct isc_ht));
+	isc_mem_putanddetach(&ht->mctx, ht, sizeof(*ht));
 }
 
-isc_result_t
-isc_ht_add(isc_ht_t *ht, const unsigned char *key, uint32_t keysize,
-	   void *value) {
+static void
+isc__ht_add(isc_ht_t *ht, const unsigned char *key, const uint32_t keysize,
+	    const uint32_t hashval, const uint8_t idx, void *value) {
 	isc_ht_node_t *node;
 	uint32_t hash;
 
+	hash = hash_32(hashval, ht->hashbits[idx]);
+
+	node = isc_mem_get(ht->mctx, sizeof(*node) + keysize);
+	*node = (isc_ht_node_t){
+		.keysize = keysize,
+		.hashval = hashval,
+		.next = ht->table[idx][hash],
+		.value = value,
+	};
+
+	memmove(node->key, key, keysize);
+
+	ht->count++;
+	ht->table[idx][hash] = node;
+}
+
+isc_result_t
+isc_ht_add(isc_ht_t *ht, const unsigned char *key, const uint32_t keysize,
+	   void *value) {
+	uint32_t hashval;
+
 	REQUIRE(ISC_HT_VALID(ht));
 	REQUIRE(key != NULL && keysize > 0);
 
-	hash = isc_hash_function(key, keysize, true);
-	node = ht->table[hash & ht->mask];
-	while (node != NULL) {
-		if (keysize == node->keysize &&
-		    memcmp(key, node->key, keysize) == 0)
-		{
-			return (ISC_R_EXISTS);
-		}
-		node = node->next;
+	if (rehashing_in_progress(ht)) {
+		/* Rehash in progress */
+		hashtable_rehash_one(ht);
+	} else if (hashtable_is_overcommited(ht)) {
+		/* Rehash requested */
+		maybe_rehash(ht, ht->count);
 	}
 
-	node = isc_mem_get(ht->mctx, offsetof(isc_ht_node_t, key) + keysize);
+	hashval = isc_hash32(key, keysize, ht->case_sensitive);
 
-	memmove(node->key, key, keysize);
-	node->keysize = keysize;
-	node->next = ht->table[hash & ht->mask];
-	node->value = value;
+	if (isc__ht_find(ht, key, keysize, hashval, ht->hindex) != NULL) {
+		return (ISC_R_EXISTS);
+	}
+
+	isc__ht_add(ht, key, keysize, hashval, ht->hindex, value);
 
-	ht->count++;
-	ht->table[hash & ht->mask] = node;
 	return (ISC_R_SUCCESS);
 }
 
+static isc_ht_node_t *
+isc__ht_find(const isc_ht_t *ht, const unsigned char *key,
+	     const uint32_t keysize, const uint32_t hashval,
+	     const uint8_t idx) {
+	uint32_t hash;
+	uint8_t findex = idx;
+
+nexttable:
+	hash = hash_32(hashval, ht->hashbits[findex]);
+	for (isc_ht_node_t *node = ht->table[findex][hash]; node != NULL;
+	     node = node->next)
+	{
+		if (isc__ht_node_match(node, hashval, key, keysize,
+				       ht->case_sensitive))
+		{
+			return (node);
+		}
+	}
+	if (TRY_NEXTTABLE(findex, ht)) {
+		/*
+		 * Rehashing in progress, check the other table
+		 */
+		findex = HT_NEXTTABLE(findex);
+		goto nexttable;
+	}
+
+	return (NULL);
+}
+
 isc_result_t
-isc_ht_find(const isc_ht_t *ht, const unsigned char *key, uint32_t keysize,
-	    void **valuep) {
+isc_ht_find(const isc_ht_t *ht, const unsigned char *key,
+	    const uint32_t keysize, void **valuep) {
+	uint32_t hashval;
 	isc_ht_node_t *node;
-	uint32_t hash;
 
 	REQUIRE(ISC_HT_VALID(ht));
 	REQUIRE(key != NULL && keysize > 0);
 	REQUIRE(valuep == NULL || *valuep == NULL);
 
-	hash = isc_hash_function(key, keysize, true);
-	node = ht->table[hash & ht->mask];
-	while (node != NULL) {
-		if (keysize == node->keysize &&
-		    memcmp(key, node->key, keysize) == 0)
-		{
-			if (valuep != NULL) {
-				*valuep = node->value;
-			}
-			return (ISC_R_SUCCESS);
-		}
-		node = node->next;
+	hashval = isc_hash32(key, keysize, ht->case_sensitive);
+
+	node = isc__ht_find(ht, key, keysize, hashval, ht->hindex);
+	if (node == NULL) {
+		return (ISC_R_NOTFOUND);
 	}
 
-	return (ISC_R_NOTFOUND);
+	if (valuep != NULL) {
+		*valuep = node->value;
+	}
+	return (ISC_R_SUCCESS);
 }
 
-isc_result_t
-isc_ht_delete(isc_ht_t *ht, const unsigned char *key, uint32_t keysize) {
-	isc_ht_node_t *node, *prev;
+static isc_result_t
+isc__ht_delete(isc_ht_t *ht, const unsigned char *key, const uint32_t keysize,
+	       const uint32_t hashval, const uint8_t idx) {
+	isc_ht_node_t *prev = NULL;
 	uint32_t hash;
 
-	REQUIRE(ISC_HT_VALID(ht));
-	REQUIRE(key != NULL && keysize > 0);
+	hash = hash_32(hashval, ht->hashbits[idx]);
 
-	prev = NULL;
-	hash = isc_hash_function(key, keysize, true);
-	node = ht->table[hash & ht->mask];
-	while (node != NULL) {
-		if (keysize == node->keysize &&
-		    memcmp(key, node->key, keysize) == 0)
+	for (isc_ht_node_t *node = ht->table[idx][hash]; node != NULL;
+	     prev = node, node = node->next)
+	{
+		if (isc__ht_node_match(node, hashval, key, keysize,
+				       ht->case_sensitive))
 		{
 			if (prev == NULL) {
-				ht->table[hash & ht->mask] = node->next;
+				ht->table[idx][hash] = node->next;
 			} else {
 				prev->next = node->next;
 			}
 			isc_mem_put(ht->mctx, node,
-				    offsetof(isc_ht_node_t, key) +
-					    node->keysize);
+				    sizeof(*node) + node->keysize);
 			ht->count--;
 
 			return (ISC_R_SUCCESS);
 		}
-
-		prev = node;
-		node = node->next;
 	}
+
 	return (ISC_R_NOTFOUND);
 }
 
+isc_result_t
+isc_ht_delete(isc_ht_t *ht, const unsigned char *key, const uint32_t keysize) {
+	uint32_t hashval;
+	uint8_t hindex;
+	isc_result_t result;
+
+	REQUIRE(ISC_HT_VALID(ht));
+	REQUIRE(key != NULL && keysize > 0);
+
+	if (rehashing_in_progress(ht)) {
+		/* Rehash in progress */
+		hashtable_rehash_one(ht);
+	}
+
+	hindex = ht->hindex;
+	hashval = isc_hash32(key, keysize, ht->case_sensitive);
+nexttable:
+	result = isc__ht_delete(ht, key, keysize, hashval, hindex);
+
+	if (result == ISC_R_NOTFOUND && TRY_NEXTTABLE(hindex, ht)) {
+		/*
+		 * Rehashing in progress, check the other table
+		 */
+		hindex = HT_NEXTTABLE(hindex);
+		goto nexttable;
+	}
+
+	return (result);
+}
+
 void
 isc_ht_iter_create(isc_ht_t *ht, isc_ht_iter_t **itp) {
 	isc_ht_iter_t *it;
@@ -211,10 +492,10 @@ isc_ht_iter_create(isc_ht_t *ht, isc_ht_iter_t **itp) {
 	REQUIRE(itp != NULL && *itp == NULL);
 
 	it = isc_mem_get(ht->mctx, sizeof(isc_ht_iter_t));
-
-	it->ht = ht;
-	it->i = 0;
-	it->cur = NULL;
+	*it = (isc_ht_iter_t){
+		.ht = ht,
+		.hindex = ht->hindex,
+	};
 
 	*itp = it;
 }
@@ -229,25 +510,46 @@ isc_ht_iter_destroy(isc_ht_iter_t **itp) {
 	it = *itp;
 	*itp = NULL;
 	ht = it->ht;
-	isc_mem_put(ht->mctx, it, sizeof(isc_ht_iter_t));
+	isc_mem_put(ht->mctx, it, sizeof(*it));
 }
 
 isc_result_t
 isc_ht_iter_first(isc_ht_iter_t *it) {
+	isc_ht_t *ht;
+
 	REQUIRE(it != NULL);
 
+	ht = it->ht;
+
+	it->hindex = ht->hindex;
 	it->i = 0;
-	while (it->i < it->ht->size && it->ht->table[it->i] == NULL) {
+
+	return (isc__ht_iter_next(it));
+}
+
+static isc_result_t
+isc__ht_iter_next(isc_ht_iter_t *it) {
+	isc_ht_t *ht = it->ht;
+
+	while (it->i < ht->size[it->hindex] &&
+	       ht->table[it->hindex][it->i] == NULL)
+	{
 		it->i++;
 	}
 
-	if (it->i == it->ht->size) {
-		return (ISC_R_NOMORE);
+	if (it->i < ht->size[it->hindex]) {
+		it->cur = ht->table[it->hindex][it->i];
+
+		return (ISC_R_SUCCESS);
 	}
 
-	it->cur = it->ht->table[it->i];
+	if (TRY_NEXTTABLE(it->hindex, ht)) {
+		it->hindex = HT_NEXTTABLE(it->hindex);
+		it->i = 0;
+		return (isc__ht_iter_next(it));
+	}
 
-	return (ISC_R_SUCCESS);
+	return (ISC_R_NOMORE);
 }
 
 isc_result_t
@@ -256,60 +558,36 @@ isc_ht_iter_next(isc_ht_iter_t *it) {
 	REQUIRE(it->cur != NULL);
 
 	it->cur = it->cur->next;
-	if (it->cur == NULL) {
-		do {
-			it->i++;
-		} while (it->i < it->ht->size && it->ht->table[it->i] == NULL);
-		if (it->i >= it->ht->size) {
-			return (ISC_R_NOMORE);
-		}
-		it->cur = it->ht->table[it->i];
+
+	if (it->cur != NULL) {
+		return (ISC_R_SUCCESS);
 	}
 
-	return (ISC_R_SUCCESS);
+	it->i++;
+
+	return (isc__ht_iter_next(it));
 }
 
 isc_result_t
 isc_ht_iter_delcurrent_next(isc_ht_iter_t *it) {
 	isc_result_t result = ISC_R_SUCCESS;
-	isc_ht_node_t *to_delete = NULL;
-	isc_ht_node_t *prev = NULL;
-	isc_ht_node_t *node = NULL;
-	uint32_t hash;
+	isc_ht_node_t *dnode = NULL;
+	uint8_t dindex;
 	isc_ht_t *ht;
+	isc_result_t dresult;
+
 	REQUIRE(it != NULL);
 	REQUIRE(it->cur != NULL);
-	to_delete = it->cur;
-	ht = it->ht;
 
-	it->cur = it->cur->next;
-	if (it->cur == NULL) {
-		do {
-			it->i++;
-		} while (it->i < ht->size && ht->table[it->i] == NULL);
-		if (it->i >= ht->size) {
-			result = ISC_R_NOMORE;
-		} else {
-			it->cur = ht->table[it->i];
-		}
-	}
+	ht = it->ht;
+	dnode = it->cur;
+	dindex = it->hindex;
 
-	hash = isc_hash_function(to_delete->key, to_delete->keysize, true);
-	node = ht->table[hash & ht->mask];
-	while (node != to_delete) {
-		prev = node;
-		node = node->next;
-		INSIST(node != NULL);
-	}
+	result = isc_ht_iter_next(it);
 
-	if (prev == NULL) {
-		ht->table[hash & ht->mask] = node->next;
-	} else {
-		prev->next = node->next;
-	}
-	isc_mem_put(ht->mctx, node,
-		    offsetof(isc_ht_node_t, key) + node->keysize);
-	ht->count--;
+	dresult = isc__ht_delete(ht, dnode->key, dnode->keysize, dnode->hashval,
+				 dindex);
+	INSIST(dresult == ISC_R_SUCCESS);
 
 	return (result);
 }
@@ -334,8 +612,8 @@ isc_ht_iter_currentkey(isc_ht_iter_t *it, unsigned char **key,
 	*keysize = it->cur->keysize;
 }
 
-unsigned int
-isc_ht_count(isc_ht_t *ht) {
+size_t
+isc_ht_count(const isc_ht_t *ht) {
 	REQUIRE(ISC_HT_VALID(ht));
 
 	return (ht->count);
diff --git a/lib/isc/include/isc/endian.h b/lib/isc/include/isc/endian.h
index e598a7b..9b4f635 100644
--- a/lib/isc/include/isc/endian.h
+++ b/lib/isc/include/isc/endian.h
@@ -110,29 +110,29 @@
 #include <inttypes.h>
 
 #ifndef bswap_16
-#define bswap_16(x)                                 \
-	((uint16_t)((((uint16_t)(x)&0xff00) >> 8) | \
-		    (((uint16_t)(x)&0x00ff) << 8)))
+#define bswap_16(x)                                   \
+	((uint16_t)((((uint16_t)(x) & 0xff00) >> 8) | \
+		    (((uint16_t)(x) & 0x00ff) << 8)))
 #endif /* !bswap_16 */
 
 #ifndef bswap_32
-#define bswap_32(x)                                      \
-	((uint32_t)((((uint32_t)(x)&0xff000000) >> 24) | \
-		    (((uint32_t)(x)&0x00ff0000) >> 8) |  \
-		    (((uint32_t)(x)&0x0000ff00) << 8) |  \
-		    (((uint32_t)(x)&0x000000ff) << 24)))
+#define bswap_32(x)                                        \
+	((uint32_t)((((uint32_t)(x) & 0xff000000) >> 24) | \
+		    (((uint32_t)(x) & 0x00ff0000) >> 8) |  \
+		    (((uint32_t)(x) & 0x0000ff00) << 8) |  \
+		    (((uint32_t)(x) & 0x000000ff) << 24)))
 #endif /* !bswap_32 */
 
 #ifndef bswap_64
-#define bswap_64(x)                                                 \
-	((uint64_t)((((uint64_t)(x)&0xff00000000000000ULL) >> 56) | \
-		    (((uint64_t)(x)&0x00ff000000000000ULL) >> 40) | \
-		    (((uint64_t)(x)&0x0000ff0000000000ULL) >> 24) | \
-		    (((uint64_t)(x)&0x000000ff00000000ULL) >> 8) |  \
-		    (((uint64_t)(x)&0x00000000ff000000ULL) << 8) |  \
-		    (((uint64_t)(x)&0x0000000000ff0000ULL) << 24) | \
-		    (((uint64_t)(x)&0x000000000000ff00ULL) << 40) | \
-		    (((uint64_t)(x)&0x00000000000000ffULL) << 56)))
+#define bswap_64(x)                                                   \
+	((uint64_t)((((uint64_t)(x) & 0xff00000000000000ULL) >> 56) | \
+		    (((uint64_t)(x) & 0x00ff000000000000ULL) >> 40) | \
+		    (((uint64_t)(x) & 0x0000ff0000000000ULL) >> 24) | \
+		    (((uint64_t)(x) & 0x000000ff00000000ULL) >> 8) |  \
+		    (((uint64_t)(x) & 0x00000000ff000000ULL) << 8) |  \
+		    (((uint64_t)(x) & 0x0000000000ff0000ULL) << 24) | \
+		    (((uint64_t)(x) & 0x000000000000ff00ULL) << 40) | \
+		    (((uint64_t)(x) & 0x00000000000000ffULL) << 56)))
 #endif /* !bswap_64 */
 
 #ifndef htobe16
diff --git a/lib/isc/include/isc/ht.h b/lib/isc/include/isc/ht.h
index f1386bb..163fbef 100644
--- a/lib/isc/include/isc/ht.h
+++ b/lib/isc/include/isc/ht.h
@@ -13,8 +13,7 @@
 
 /* ! \file */
 
-#ifndef ISC_HT_H
-#define ISC_HT_H 1
+#pragma once
 
 #include <inttypes.h>
 #include <string.h>
@@ -25,9 +24,15 @@
 typedef struct isc_ht	   isc_ht_t;
 typedef struct isc_ht_iter isc_ht_iter_t;
 
+enum { ISC_HT_CASE_SENSITIVE = 0x00, ISC_HT_CASE_INSENSITIVE = 0x01 };
+
 /*%
  * Initialize hashtable at *htp, using memory context and size of (1<<bits)
  *
+ * If 'options' contains ISC_HT_CASE_INSENSITIVE, then upper- and lower-case
+ * letters in key values will generate the same hash values; this can be used
+ * when the key for a hash table is a DNS name.
+ *
  * Requires:
  *\li	'htp' is not NULL and '*htp' is NULL.
  *\li	'mctx' is a valid memory context.
@@ -35,7 +40,8 @@ typedef struct isc_ht_iter isc_ht_iter_t;
  *
  */
 void
-isc_ht_init(isc_ht_t **htp, isc_mem_t *mctx, uint8_t bits);
+isc_ht_init(isc_ht_t **htp, isc_mem_t *mctx, uint8_t bits,
+	    unsigned int options);
 
 /*%
  * Destroy hashtable, freeing everything
@@ -52,6 +58,7 @@ isc_ht_destroy(isc_ht_t **htp);
  *
  * Requires:
  *\li	'ht' is a valid hashtable
+ *\li   write-lock
  *
  * Returns:
  *\li	#ISC_R_NOMEMORY		-- not enough memory to create pool
@@ -59,7 +66,7 @@ isc_ht_destroy(isc_ht_t **htp);
  *\li	#ISC_R_SUCCESS		-- all is well.
  */
 isc_result_t
-isc_ht_add(isc_ht_t *ht, const unsigned char *key, uint32_t keysize,
+isc_ht_add(isc_ht_t *ht, const unsigned char *key, const uint32_t keysize,
 	   void *value);
 
 /*%
@@ -70,27 +77,29 @@ isc_ht_add(isc_ht_t *ht, const unsigned char *key, uint32_t keysize,
  *
  * Requires:
  * \li	'ht' is a valid hashtable
+ * \li  read-lock
  *
  * Returns:
  * \li	#ISC_R_SUCCESS		-- success
  * \li	#ISC_R_NOTFOUND		-- key not found
  */
 isc_result_t
-isc_ht_find(const isc_ht_t *ht, const unsigned char *key, uint32_t keysize,
-	    void **valuep);
+isc_ht_find(const isc_ht_t *ht, const unsigned char *key,
+	    const uint32_t keysize, void **valuep);
 
 /*%
  * Delete node from hashtable
  *
  * Requires:
  *\li	ht is a valid hashtable
+ *\li   write-lock
  *
  * Returns:
  *\li	#ISC_R_NOTFOUND		-- key not found
  *\li	#ISC_R_SUCCESS		-- all is well
  */
 isc_result_t
-isc_ht_delete(isc_ht_t *ht, const unsigned char *key, uint32_t keysize);
+isc_ht_delete(isc_ht_t *ht, const unsigned char *key, const uint32_t keysize);
 
 /*%
  * Create an iterator for the hashtable; point '*itp' to it.
@@ -178,6 +187,5 @@ isc_ht_iter_currentkey(isc_ht_iter_t *it, unsigned char **key, size_t *keysize);
  * Requires:
  *\li	'ht' is a valid hashtable
  */
-unsigned int
-isc_ht_count(isc_ht_t *ht);
-#endif /* ifndef ISC_HT_H */
+size_t
+isc_ht_count(const isc_ht_t *ht);
diff --git a/lib/isc/include/isc/netmgr.h b/lib/isc/include/isc/netmgr.h
index f1747be..efeb5f3 100644
--- a/lib/isc/include/isc/netmgr.h
+++ b/lib/isc/include/isc/netmgr.h
@@ -479,6 +479,9 @@ isc_nm_tcpdnsconnect(isc_nm_t *mgr, isc_sockaddr_t *local, isc_sockaddr_t *peer,
  * 'cb'.
  */
 
+#define ISC_NM_TASK_SLOW_OFFSET -2
+#define ISC_NM_TASK_SLOW(i)	(ISC_NM_TASK_SLOW_OFFSET - 1 - i)
+
 void
 isc_nm_task_enqueue(isc_nm_t *mgr, isc_task_t *task, int threadid);
 /*%<
diff --git a/lib/isc/include/isc/radix.h b/lib/isc/include/isc/radix.h
index 7c004e9..93b0aae 100644
--- a/lib/isc/include/isc/radix.h
+++ b/lib/isc/include/isc/radix.h
@@ -193,7 +193,7 @@ isc_radix_process(isc_radix_tree_t *radix, isc_radix_processfunc_t func);
  */
 
 #define RADIX_MAXBITS  128
-#define RADIX_NBIT(x)  (0x80 >> ((x)&0x7f))
+#define RADIX_NBIT(x)  (0x80 >> ((x) & 0x7f))
 #define RADIX_NBYTE(x) ((x) >> 3)
 
 #define RADIX_WALK(Xhead, Xnode)                              \
diff --git a/lib/isc/include/isc/resultclass.h b/lib/isc/include/isc/resultclass.h
index a3a5079..61c5d7b 100644
--- a/lib/isc/include/isc/resultclass.h
+++ b/lib/isc/include/isc/resultclass.h
@@ -29,7 +29,7 @@
 #define ISC_RESULTCLASS_TONUM(rclass) ((rclass) >> 16)
 #define ISC_RESULTCLASS_SIZE	      65536
 #define ISC_RESULTCLASS_INCLASS(rclass, result) \
-	((rclass) == ((result)&0xFFFF0000))
+	((rclass) == ((result) & 0xFFFF0000))
 
 #define ISC_RESULTCLASS_ISC	 ISC_RESULTCLASS_FROMNUM(0)
 #define ISC_RESULTCLASS_DNS	 ISC_RESULTCLASS_FROMNUM(1)
diff --git a/lib/isc/netaddr.c b/lib/isc/netaddr.c
index 39aaae6..62ce195 100644
--- a/lib/isc/netaddr.c
+++ b/lib/isc/netaddr.c
@@ -436,7 +436,7 @@ isc_netaddr_issitelocal(const isc_netaddr_t *na) {
 }
 
 #define ISC_IPADDR_ISNETZERO(i) \
-	(((uint32_t)(i)&ISC__IPADDR(0xff000000)) == ISC__IPADDR(0x00000000))
+	(((uint32_t)(i) & ISC__IPADDR(0xff000000)) == ISC__IPADDR(0x00000000))
 
 bool
 isc_netaddr_isnetzero(const isc_netaddr_t *na) {
diff --git a/lib/isc/netmgr/netmgr-int.h b/lib/isc/netmgr/netmgr-int.h
index 05fde1a..c3a1762 100644
--- a/lib/isc/netmgr/netmgr-int.h
+++ b/lib/isc/netmgr/netmgr-int.h
@@ -655,6 +655,7 @@ struct isc_nm {
 	isc_refcount_t references;
 	isc_mem_t *mctx;
 	int nworkers;
+	int nlisteners;
 	isc_mutex_t lock;
 	isc_condition_t wkstatecond;
 	isc_condition_t wkpausecond;
diff --git a/lib/isc/netmgr/netmgr.c b/lib/isc/netmgr/netmgr.c
index 6f42ec9..7bff1cc 100644
--- a/lib/isc/netmgr/netmgr.c
+++ b/lib/isc/netmgr/netmgr.c
@@ -231,12 +231,12 @@ isc__nm_winsock_destroy(void) {
 #endif /* WIN32 */
 
 static void
-isc__nm_threadpool_initialize(uint32_t workers) {
+isc__nm_threadpool_initialize(uint32_t nworkers) {
 	char buf[11];
 	int r = uv_os_getenv("UV_THREADPOOL_SIZE", buf,
 			     &(size_t){ sizeof(buf) });
 	if (r == UV_ENOENT) {
-		snprintf(buf, sizeof(buf), "%" PRIu32, workers);
+		snprintf(buf, sizeof(buf), "%" PRIu32, nworkers);
 		uv_os_setenv("UV_THREADPOOL_SIZE", buf);
 	}
 }
@@ -254,11 +254,11 @@ isc__nm_threadpool_initialize(uint32_t workers) {
 #endif
 
 void
-isc__netmgr_create(isc_mem_t *mctx, uint32_t workers, isc_nm_t **netmgrp) {
+isc__netmgr_create(isc_mem_t *mctx, uint32_t nworkers, isc_nm_t **netmgrp) {
 	isc_nm_t *mgr = NULL;
 	char name[32];
 
-	REQUIRE(workers > 0);
+	REQUIRE(nworkers > 0);
 
 #ifdef MAXIMAL_UV_VERSION
 	if (uv_version() > MAXIMAL_UV_VERSION) {
@@ -282,10 +282,13 @@ isc__netmgr_create(isc_mem_t *mctx, uint32_t workers, isc_nm_t **netmgrp) {
 	isc__nm_winsock_initialize();
 #endif /* WIN32 */
 
-	isc__nm_threadpool_initialize(workers);
+	isc__nm_threadpool_initialize(nworkers);
 
 	mgr = isc_mem_get(mctx, sizeof(*mgr));
-	*mgr = (isc_nm_t){ .nworkers = workers };
+	*mgr = (isc_nm_t){
+		.nworkers = nworkers * 2,
+		.nlisteners = nworkers,
+	};
 
 	isc_mem_attach(mctx, &mgr->mctx);
 	isc_mutex_init(&mgr->lock);
@@ -316,11 +319,12 @@ isc__netmgr_create(isc_mem_t *mctx, uint32_t workers, isc_nm_t **netmgrp) {
 	atomic_init(&mgr->keepalive, 30000);
 	atomic_init(&mgr->advertised, 30000);
 
-	isc_barrier_init(&mgr->pausing, workers);
-	isc_barrier_init(&mgr->resuming, workers);
+	isc_barrier_init(&mgr->pausing, mgr->nworkers);
+	isc_barrier_init(&mgr->resuming, mgr->nworkers);
 
-	mgr->workers = isc_mem_get(mctx, workers * sizeof(isc__networker_t));
-	for (size_t i = 0; i < workers; i++) {
+	mgr->workers = isc_mem_get(mctx,
+				   mgr->nworkers * sizeof(isc__networker_t));
+	for (int i = 0; i < mgr->nworkers; i++) {
 		isc__networker_t *worker = &mgr->workers[i];
 		int r;
 
@@ -354,7 +358,7 @@ isc__netmgr_create(isc_mem_t *mctx, uint32_t workers, isc_nm_t **netmgrp) {
 		mgr->workers_running++;
 		isc_thread_create(nm_thread, &mgr->workers[i], &worker->thread);
 
-		snprintf(name, sizeof(name), "isc-net-%04zu", i);
+		snprintf(name, sizeof(name), "isc-net-%04d", i);
 		isc_thread_setname(worker->thread, name);
 	}
 
@@ -840,9 +844,15 @@ isc_nm_task_enqueue(isc_nm_t *nm, isc_task_t *task, int threadid) {
 	isc__networker_t *worker = NULL;
 
 	if (threadid == -1) {
-		tid = (int)isc_random_uniform(nm->nworkers);
+		tid = (int)isc_random_uniform(nm->nlisteners);
+	} else if (threadid == ISC_NM_TASK_SLOW_OFFSET) {
+		tid = nm->nlisteners +
+		      (int)isc_random_uniform(nm->nworkers - nm->nlisteners);
+	} else if (threadid < ISC_NM_TASK_SLOW_OFFSET) {
+		tid = nm->nlisteners + (ISC_NM_TASK_SLOW(threadid) %
+					(nm->nworkers - nm->nlisteners));
 	} else {
-		tid = threadid % nm->nworkers;
+		tid = threadid % nm->nlisteners;
 	}
 
 	worker = &nm->workers[tid];
diff --git a/lib/isc/netmgr/tcp.c b/lib/isc/netmgr/tcp.c
index 821d6c4..1666318 100644
--- a/lib/isc/netmgr/tcp.c
+++ b/lib/isc/netmgr/tcp.c
@@ -323,7 +323,7 @@ isc_nm_tcpconnect(isc_nm_t *mgr, isc_sockaddr_t *local, isc_sockaddr_t *peer,
 			isc__nm_connectcb(sock, req, result, false);
 		} else {
 			isc__nmsocket_clearcb(sock);
-			sock->tid = isc_random_uniform(mgr->nworkers);
+			sock->tid = isc_random_uniform(mgr->nlisteners);
 			isc__nm_connectcb(sock, req, result, true);
 		}
 		atomic_store(&sock->closed, true);
@@ -341,7 +341,7 @@ isc_nm_tcpconnect(isc_nm_t *mgr, isc_sockaddr_t *local, isc_sockaddr_t *peer,
 		isc__nm_put_netievent_tcpconnect(mgr, ievent);
 	} else {
 		atomic_init(&sock->active, false);
-		sock->tid = isc_random_uniform(mgr->nworkers);
+		sock->tid = isc_random_uniform(mgr->nlisteners);
 		isc__nm_enqueue_ievent(&mgr->workers[sock->tid],
 				       (isc__netievent_t *)ievent);
 	}
@@ -445,7 +445,7 @@ isc_nm_listentcp(isc_nm_t *mgr, isc_sockaddr_t *iface,
 #if defined(WIN32)
 	sock->nchildren = 1;
 #else
-	sock->nchildren = mgr->nworkers;
+	sock->nchildren = mgr->nlisteners;
 #endif
 	children_size = sock->nchildren * sizeof(sock->children[0]);
 	sock->children = isc_mem_get(mgr->mctx, children_size);
diff --git a/lib/isc/netmgr/tcpdns.c b/lib/isc/netmgr/tcpdns.c
index bd593eb..037d74c 100644
--- a/lib/isc/netmgr/tcpdns.c
+++ b/lib/isc/netmgr/tcpdns.c
@@ -303,7 +303,7 @@ isc_nm_tcpdnsconnect(isc_nm_t *mgr, isc_sockaddr_t *local, isc_sockaddr_t *peer,
 		isc__nm_put_netievent_tcpdnsconnect(mgr, ievent);
 	} else {
 		atomic_init(&sock->active, false);
-		sock->tid = isc_random_uniform(mgr->nworkers);
+		sock->tid = isc_random_uniform(mgr->nlisteners);
 		isc__nm_enqueue_ievent(&mgr->workers[sock->tid],
 				       (isc__netievent_t *)ievent);
 	}
@@ -410,7 +410,7 @@ isc_nm_listentcpdns(isc_nm_t *mgr, isc_sockaddr_t *iface,
 #if defined(WIN32)
 	sock->nchildren = 1;
 #else
-	sock->nchildren = mgr->nworkers;
+	sock->nchildren = mgr->nlisteners;
 #endif
 	children_size = sock->nchildren * sizeof(sock->children[0]);
 	sock->children = isc_mem_get(mgr->mctx, children_size);
diff --git a/lib/isc/netmgr/udp.c b/lib/isc/netmgr/udp.c
index 00f9d40..bc59fca 100644
--- a/lib/isc/netmgr/udp.c
+++ b/lib/isc/netmgr/udp.c
@@ -136,7 +136,7 @@ isc_nm_listenudp(isc_nm_t *mgr, isc_sockaddr_t *iface, isc_nm_recv_cb_t cb,
 	uv_os_sock_t fd = -1;
 
 	/*
-	 * We are creating mgr->nworkers duplicated sockets, one
+	 * We are creating mgr->nlisteners duplicated sockets, one
 	 * socket for each worker thread.
 	 */
 	sock = isc_mem_get(mgr->mctx, sizeof(isc_nmsocket_t));
@@ -146,7 +146,7 @@ isc_nm_listenudp(isc_nm_t *mgr, isc_sockaddr_t *iface, isc_nm_recv_cb_t cb,
 #if defined(WIN32)
 	sock->nchildren = 1;
 #else
-	sock->nchildren = mgr->nworkers;
+	sock->nchildren = mgr->nlisteners;
 #endif
 
 	children_size = sock->nchildren * sizeof(sock->children[0]);
@@ -847,7 +847,7 @@ isc_nm_udpconnect(isc_nm_t *mgr, isc_sockaddr_t *local, isc_sockaddr_t *peer,
 		isc__nm_put_netievent_udpconnect(mgr, event);
 	} else {
 		atomic_init(&sock->active, false);
-		sock->tid = isc_random_uniform(mgr->nworkers);
+		sock->tid = isc_random_uniform(mgr->nlisteners);
 		isc__nm_enqueue_ievent(&mgr->workers[sock->tid],
 				       (isc__netievent_t *)event);
 	}
diff --git a/lib/isc/netmgr/uv-compat.h b/lib/isc/netmgr/uv-compat.h
index 3a10387..eea8744 100644
--- a/lib/isc/netmgr/uv-compat.h
+++ b/lib/isc/netmgr/uv-compat.h
@@ -72,7 +72,7 @@ uv_tcp_close_reset(uv_tcp_t *handle, uv_close_cb close_cb);
 #endif
 
 #if UV_VERSION_HEX < UV_VERSION(1, 34, 0)
-#define uv_sleep(msec) usleep(msec * 1000)
+#define uv_sleep(msec) usleep((msec) * 1000)
 #endif /* UV_VERSION_HEX < UV_VERSION(1, 34, 0) */
 
 #if UV_VERSION_HEX < UV_VERSION(1, 27, 0)
diff --git a/lib/isc/tests/ht_test.c b/lib/isc/tests/ht_test.c
index 30cc615..cc824c3 100644
--- a/lib/isc/tests/ht_test.c
+++ b/lib/isc/tests/ht_test.c
@@ -61,7 +61,7 @@ test_ht_full(int bits, uintptr_t count) {
 	isc_result_t result;
 	uintptr_t i;
 
-	isc_ht_init(&ht, test_mctx, bits);
+	isc_ht_init(&ht, test_mctx, bits, ISC_HT_CASE_SENSITIVE);
 	assert_non_null(ht);
 
 	for (i = 1; i < count; i++) {
@@ -206,7 +206,7 @@ test_ht_iterator() {
 	unsigned char key[16];
 	size_t tksize;
 
-	isc_ht_init(&ht, test_mctx, 16);
+	isc_ht_init(&ht, test_mctx, 16, ISC_HT_CASE_SENSITIVE);
 	assert_non_null(ht);
 	for (i = 1; i <= count; i++) {
 		/*
@@ -333,9 +333,62 @@ isc_ht_iterator_test(void **state) {
 	test_ht_iterator();
 }
 
+static void
+isc_ht_case(void **state) {
+	UNUSED(state);
+
+	isc_ht_t *ht = NULL;
+	void *f = NULL;
+	isc_result_t result = ISC_R_UNSET;
+
+	unsigned char lower[16] = { "test case" };
+	unsigned char same[16] = { "test case" };
+	unsigned char upper[16] = { "TEST CASE" };
+	unsigned char mixed[16] = { "tEsT CaSe" };
+
+	isc_ht_init(&ht, test_mctx, 8, ISC_HT_CASE_SENSITIVE);
+	assert_non_null(ht);
+
+	result = isc_ht_add(ht, lower, 16, (void *)lower);
+	assert_int_equal(result, ISC_R_SUCCESS);
+
+	result = isc_ht_add(ht, same, 16, (void *)same);
+	assert_int_equal(result, ISC_R_EXISTS);
+
+	result = isc_ht_add(ht, upper, 16, (void *)upper);
+	assert_int_equal(result, ISC_R_SUCCESS);
+
+	result = isc_ht_find(ht, mixed, 16, &f);
+	assert_int_equal(result, ISC_R_NOTFOUND);
+	assert_null(f);
+
+	isc_ht_destroy(&ht);
+	assert_null(ht);
+
+	isc_ht_init(&ht, test_mctx, 8, ISC_HT_CASE_INSENSITIVE);
+	assert_non_null(ht);
+
+	result = isc_ht_add(ht, lower, 16, (void *)lower);
+	assert_int_equal(result, ISC_R_SUCCESS);
+
+	result = isc_ht_add(ht, same, 16, (void *)same);
+	assert_int_equal(result, ISC_R_EXISTS);
+
+	result = isc_ht_add(ht, upper, 16, (void *)upper);
+	assert_int_equal(result, ISC_R_EXISTS);
+
+	result = isc_ht_find(ht, mixed, 16, &f);
+	assert_int_equal(result, ISC_R_SUCCESS);
+	assert_ptr_equal(f, &lower);
+
+	isc_ht_destroy(&ht);
+	assert_null(ht);
+}
+
 int
 main(void) {
 	const struct CMUnitTest tests[] = {
+		cmocka_unit_test(isc_ht_case),
 		cmocka_unit_test(isc_ht_20),
 		cmocka_unit_test(isc_ht_8),
 		cmocka_unit_test(isc_ht_1),
diff --git a/lib/isc/unix/include/isc/net.h b/lib/isc/unix/include/isc/net.h
index ead9c7f..9401ef7 100644
--- a/lib/isc/unix/include/isc/net.h
+++ b/lib/isc/unix/include/isc/net.h
@@ -194,10 +194,10 @@
 
 /*% Is IP address multicast? */
 #define ISC_IPADDR_ISMULTICAST(i) \
-	(((uint32_t)(i)&ISC__IPADDR(0xf0000000)) == ISC__IPADDR(0xe0000000))
+	(((uint32_t)(i) & ISC__IPADDR(0xf0000000)) == ISC__IPADDR(0xe0000000))
 
 #define ISC_IPADDR_ISEXPERIMENTAL(i) \
-	(((uint32_t)(i)&ISC__IPADDR(0xf0000000)) == ISC__IPADDR(0xf0000000))
+	(((uint32_t)(i) & ISC__IPADDR(0xf0000000)) == ISC__IPADDR(0xf0000000))
 
 /***
  *** Functions.
diff --git a/lib/isc/url.c b/lib/isc/url.c
index cccb712..320a863 100644
--- a/lib/isc/url.c
+++ b/lib/isc/url.c
@@ -44,7 +44,7 @@
 #ifndef BIT_AT
 #define BIT_AT(a, i)                                    \
 	(!!((unsigned int)(a)[(unsigned int)(i) >> 3] & \
-	    (1 << ((unsigned int)(i)&7))))
+	    (1 << ((unsigned int)(i) & 7))))
 #endif
 
 #if HTTP_PARSER_STRICT
@@ -201,7 +201,8 @@ typedef enum {
 #define IS_URL_CHAR(c)	(BIT_AT(normal_url_char, (unsigned char)c))
 #define IS_HOST_CHAR(c) (isalnum((unsigned char)c) || (c) == '.' || (c) == '-')
 #else
-#define IS_URL_CHAR(c) (BIT_AT(normal_url_char, (unsigned char)c) || ((c)&0x80))
+#define IS_URL_CHAR(c) \
+	(BIT_AT(normal_url_char, (unsigned char)c) || ((c) & 0x80))
 #define IS_HOST_CHAR(c) \
 	(isalnum((unsigned char)c) || (c) == '.' || (c) == '-' || (c) == '_')
 #endif
diff --git a/lib/isc/win32/file.c b/lib/isc/win32/file.c
index 32f6a19..7da57fc 100644
--- a/lib/isc/win32/file.c
+++ b/lib/isc/win32/file.c
@@ -569,10 +569,14 @@ isc_file_isabsolute(const char *filename) {
 	if ((filename[0] == '\\') && (filename[1] == '\\')) {
 		return (true);
 	}
-	if (isalpha(filename[0]) && filename[1] == ':' && filename[2] == '\\') {
+	if (isalpha((unsigned char)filename[0]) && filename[1] == ':' &&
+	    filename[2] == '\\')
+	{
 		return (true);
 	}
-	if (isalpha(filename[0]) && filename[1] == ':' && filename[2] == '/') {
+	if (isalpha((unsigned char)filename[0]) && filename[1] == ':' &&
+	    filename[2] == '/')
+	{
 		return (true);
 	}
 	return (false);
diff --git a/lib/isc/win32/fsaccess.c b/lib/isc/win32/fsaccess.c
index 909f9e5..eb1ab54 100644
--- a/lib/isc/win32/fsaccess.c
+++ b/lib/isc/win32/fsaccess.c
@@ -70,7 +70,7 @@ is_ntfs(const char *file) {
 	 * Look for c:\path\... style, c:/path/... or \\computer\shar\path...
 	 * the UNC style file specs
 	 */
-	if (isalpha(filename[0]) && filename[1] == ':' &&
+	if (isalpha((unsigned char)filename[0]) && filename[1] == ':' &&
 	    (filename[2] == '\\' || filename[2] == '/'))
 	{
 		/* Copy 'c:\' or 'c:/' and NUL terminate. */
diff --git a/lib/isc/win32/include/isc/net.h b/lib/isc/win32/include/isc/net.h
index 391614e..3f17223 100644
--- a/lib/isc/win32/include/isc/net.h
+++ b/lib/isc/win32/include/isc/net.h
@@ -123,10 +123,10 @@ typedef uint16_t in_port_t;
 #define ISC__IPADDR(x) ((uint32_t)htonl((uint32_t)(x)))
 
 #define ISC_IPADDR_ISMULTICAST(i) \
-	(((uint32_t)(i)&ISC__IPADDR(0xf0000000)) == ISC__IPADDR(0xe0000000))
+	(((uint32_t)(i) & ISC__IPADDR(0xf0000000)) == ISC__IPADDR(0xe0000000))
 
 #define ISC_IPADDR_ISEXPERIMENTAL(i) \
-	(((uint32_t)(i)&ISC__IPADDR(0xf0000000)) == ISC__IPADDR(0xf0000000))
+	(((uint32_t)(i) & ISC__IPADDR(0xf0000000)) == ISC__IPADDR(0xf0000000))
 
 /*
  * Fix the FD_SET and FD_CLR Macros to properly cast
diff --git a/lib/isc/win32/include/isc/stat.h b/lib/isc/win32/include/isc/stat.h
index 63577f9..bc0ec04 100644
--- a/lib/isc/win32/include/isc/stat.h
+++ b/lib/isc/win32/include/isc/stat.h
@@ -49,10 +49,10 @@ typedef unsigned short mode_t;
 #endif /* ifndef S_IFREG */
 
 #ifndef S_ISDIR
-#define S_ISDIR(m) (((m)&S_IFMT) == S_IFDIR)
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
 #endif /* ifndef S_ISDIR */
 #ifndef S_ISREG
-#define S_ISREG(m) (((m)&S_IFMT) == S_IFREG)
+#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
 #endif /* ifndef S_ISREG */
 
 #endif /* ISC_STAT_H */