impl gte/lte for find and get
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ef30d16d62
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@ -40,8 +40,8 @@ SKIPLIST_DECL(
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* do that you'll have to supply some blocks of code used to
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* extract data from within your nodes.
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*/
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SKIPLIST_GETTER(
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slex, api_, get, int, int, { query.key = key; }, { return node->value; })
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SKIPLIST_GETTERS(
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slex, api_, int, int, { query.key = key; }, { return node->value; })
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/*
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* Now we need a way to compare the nodes you defined above.
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169
include/sl.h
169
include/sl.h
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@ -238,7 +238,10 @@
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return slist->slh_tail->field.sle_prev; \
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} \
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\
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/* -- skip_locate_ */ \
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/* -- skip_locate_ \
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* Locates a node that matches another node returning the path to that \
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* node and the match in path[0]. \
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*/ \
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decl##_node_t **prefix##skip_locate_##decl(decl##_t *slist, \
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decl##_node_t *n) \
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{ \
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@ -246,7 +249,7 @@
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decl##_node_t **path; \
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decl##_node_t *elm = slist->slh_head; \
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\
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if (n == NULL) \
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if (!slist || !n) \
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return NULL; \
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\
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i = slist->max + 1; \
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@ -336,6 +339,88 @@
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} \
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*/ \
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\
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/* -- skip_find_ \
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* Find a node that matches another node. This differs from the locate() \
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* API in that it does not return the path to the node, only the match. \
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* This avoids an alloc/free for the path. \
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*/ \
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decl##_node_t *prefix##skip_find_##decl(decl##_t *slist, decl##_node_t *n) \
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{ \
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unsigned int i; \
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decl##_node_t *elm = slist->slh_head; \
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\
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if (!slist || !n) \
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return NULL; \
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\
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i = slist->max + 1; \
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i = slist->level; \
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\
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do { \
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while (elm && \
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__skip_key_compare_##decl(slist, elm->field.sle_next[i], n, \
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slist->aux) < 0) \
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elm = elm->field.sle_next[i]; \
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} while (i--); \
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elm = elm->field.sle_next[0]; \
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if (__skip_key_compare_##decl(slist, elm, n, slist->aux) == 0) { \
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return elm; \
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} \
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return NULL; \
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} \
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\
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/* -- skip_find_gte \
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* Return the matching node or the next greater node after that. \
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*/ \
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decl##_node_t *prefix##skip_find_gte_##decl(decl##_t *slist, \
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decl##_node_t *n) \
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{ \
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unsigned int i; \
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decl##_node_t *elm = slist->slh_head; \
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\
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if (!slist || !n) \
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return NULL; \
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\
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i = slist->max + 1; \
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i = slist->level; \
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\
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do { \
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while (elm && \
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__skip_key_compare_##decl(slist, elm->field.sle_next[i], n, \
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slist->aux) < 0) \
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elm = elm->field.sle_next[i]; \
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} while (i--); \
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elm = elm->field.sle_next[0]; \
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return elm; \
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} \
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\
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/* -- skip_find_lte \
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* Return the matching node or the last one before it. \
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*/ \
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decl##_node_t *prefix##skip_find_lte_##decl(decl##_t *slist, \
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decl##_node_t *n) \
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{ \
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unsigned int i; \
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decl##_node_t *elm = slist->slh_head; \
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\
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if (!slist || !n) \
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return NULL; \
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\
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i = slist->max + 1; \
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i = slist->level; \
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\
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do { \
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while (elm && \
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__skip_key_compare_##decl(slist, elm->field.sle_next[i], n, \
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slist->aux) < 0) \
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elm = elm->field.sle_next[i]; \
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} while (i--); \
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if (__skip_key_compare_##decl(slist, elm->field.sle_next[0], n, \
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slist->aux) == 0) { \
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return elm->field.sle_next[0]; \
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} \
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return elm; \
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} \
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\
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/* -- skip_update_ \
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* Locates a node in the list that equals the `new` node and then \
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* uses the `update_node_blk` to update the contents. \
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@ -344,15 +429,13 @@
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*/ \
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int prefix##skip_update_##decl(decl##_t *slist, decl##_node_t *new) \
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{ \
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decl##_node_t **path, *node; \
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decl##_node_t *node; \
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\
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if (!slist || !new) \
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return -1; \
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\
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path = prefix##skip_locate_##decl(slist, new); \
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if (ARRAY_SIZE(path) > 0) { \
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node = path[0]; \
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ARRAY_FREE(path); \
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node = prefix##skip_find_##decl(slist, new); \
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if (node) { \
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update_node_blk; \
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return 0; \
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} \
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@ -397,32 +480,6 @@
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return 0; \
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} \
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\
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/* -- skip_find_ */ \
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decl##_node_t *prefix##skip_find_##decl(decl##_t *slist, decl##_node_t *n) \
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{ \
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((void)slist); /* TODO */ \
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((void)n); \
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return 0; \
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} \
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\
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/* -- skip_find_gte */ \
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decl##_node_t *prefix##skip_find_gte_##decl(decl##_t *slist, \
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decl##_node_t *n) \
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{ \
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((void)slist); /* TODO */ \
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((void)n); \
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return 0; \
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} \
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\
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/* -- skip_find_lte */ \
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decl##_node_t *prefix##skip_find_lte_##decl(decl##_t *slist, \
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decl##_node_t *n) \
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{ \
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((void)slist); /* TODO */ \
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((void)n); \
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return 0; \
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} \
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\
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/* -- skip_next_node_ */ \
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decl##_node_t *prefix##skip_next_node_##decl(decl##_t *slist, \
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decl##_node_t *n) \
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@ -474,19 +531,39 @@
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return 0; \
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}
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#define SKIPLIST_GETTER(decl, prefix, name, ktype, vtype, qblk, rblk) \
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vtype prefix##skip_##name##_##decl(decl##_t *slist, ktype key) \
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{ \
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decl##_node_t **path, *node, query; \
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\
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qblk; \
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path = prefix##skip_locate_##decl(slist, &query); \
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if (ARRAY_SIZE(path) > 0) { \
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node = path[0]; \
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ARRAY_FREE(path); \
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rblk; \
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} \
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return (vtype)0; \
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#define SKIPLIST_GETTERS(decl, prefix, ktype, vtype, qblk, rblk) \
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vtype prefix##skip_get_##decl(decl##_t *slist, ktype key) \
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{ \
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decl##_node_t *node, query; \
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\
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qblk; \
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node = prefix##skip_find_##decl(slist, &query); \
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if (node) { \
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rblk; \
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} \
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return (vtype)0; \
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} \
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vtype prefix##skip_gte_##decl(decl##_t *slist, ktype key) \
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{ \
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decl##_node_t *node, query; \
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\
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qblk; \
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node = prefix##skip_find_gte_##decl(slist, &query); \
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if (node != slist->slh_tail) { \
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rblk; \
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} \
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return (vtype)0; \
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} \
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vtype prefix##skip_lte_##decl(decl##_t *slist, ktype key) \
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{ \
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decl##_node_t *node, query; \
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\
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qblk; \
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node = prefix##skip_find_lte_##decl(slist, &query); \
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if (node != slist->slh_head) { \
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rblk; \
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} \
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return (vtype)0; \
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}
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#define SKIPLIST_DECL_DOT(decl, prefix, field) \
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