dbutils: comparison ucx/linked

-:80f9d007cb52
+:0aa8cbd7912e
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
 #include "cx/linked_list.h"
-#include "cx/utils.h"
 #include "cx/compare.h"
 #include <string.h>
 #include <assert.h>
 // LOW LEVEL LINKED LIST FUNCTIONS
 #define ll_next(node) CX_LL_PTR(node, loc_next)
 #define ll_advance(node) CX_LL_PTR(node, loc_advance)
 #define ll_data(node) (((char*)(node))+loc_data)
 void *cx_linked_list_at(
-void const *start,
+const void *start,
 size_t start_index,
 ptrdiff_t loc_advance,
 size_t index
 ) {
 assert(start != NULL);
 assert(loc_advance >= 0);
 size_t i = start_index;
-void const *cur = start;
+const void *cur = start;
 while (i != index && cur != NULL) {
 cur = ll_advance(cur);
 i < index ? i++ : i--;
 }
 return (void *) cur;
 }
 ssize_t cx_linked_list_find(
-void const *start,
+const void *start,
 ptrdiff_t loc_advance,
 ptrdiff_t loc_data,
 cx_compare_func cmp_func,
-void const *elem
+const void *elem
 ) {
 void *dummy;
 return cx_linked_list_find_node(
 &dummy, start,
 loc_advance, loc_data,
 );
 }
 ssize_t cx_linked_list_find_node(
 void **result,
-void const *start,
+const void *start,
 ptrdiff_t loc_advance,
 ptrdiff_t loc_data,
 cx_compare_func cmp_func,
-void const *elem
+const void *elem
 ) {
 assert(result != NULL);
 assert(start != NULL);
 assert(loc_advance >= 0);
 assert(loc_data >= 0);
 assert(cmp_func);
-void const *node = start;
+const void *node = start;
 ssize_t index = 0;
 do {
 void *current = ll_data(node);
 if (cmp_func(current, elem) == 0) {
-*result = (void*) node;
+*result = (void *) node;
 return index;
 }
 node = ll_advance(node);
 index++;
 } while (node != NULL);
 *result = NULL;
 return -1;
 }
 void *cx_linked_list_first(
-void const *node,
+const void *node,
 ptrdiff_t loc_prev
 ) {
 return cx_linked_list_last(node, loc_prev);
 }
 void *cx_linked_list_last(
-void const *node,
+const void *node,
 ptrdiff_t loc_next
 ) {
 assert(node != NULL);
 assert(loc_next >= 0);
-void const *cur = node;
+const void *cur = node;
-void const *last;
+const void *last;
 do {
 last = cur;
 } while ((cur = ll_next(cur)) != NULL);
 return (void *) last;
 }
 void *cx_linked_list_prev(
-void const *begin,
+const void *begin,
 ptrdiff_t loc_next,
-void const *node
+const void *node
 ) {
 assert(begin != NULL);
 assert(node != NULL);
 assert(loc_next >= 0);
 if (begin == node) return NULL;
-void const *cur = begin;
+const void *cur = begin;
-void const *next;
+const void *next;
 while (1) {
 next = ll_next(cur);
 if (next == node) return (void *) cur;
 cur = next;
 }
 } else {
 cx_linked_list_link(insert_end, successor, loc_prev, loc_next);
 }
 }
-void cx_linked_list_remove(
+void cx_linked_list_insert_sorted(
 void **begin,
 void **end,
 ptrdiff_t loc_prev,
 ptrdiff_t loc_next,
-void *node
+void *new_node,
+cx_compare_func cmp_func
+) {
+assert(ll_next(new_node) == NULL);
+cx_linked_list_insert_sorted_chain(
+begin, end, loc_prev, loc_next, new_node, cmp_func);
+}
+void cx_linked_list_insert_sorted_chain(
+void **begin,
+void **end,
+ptrdiff_t loc_prev,
+ptrdiff_t loc_next,
+void *insert_begin,
+cx_compare_func cmp_func
+) {
+assert(begin != NULL);
+assert(loc_next >= 0);
+assert(insert_begin != NULL);
+// track currently observed nodes
+void *dest_prev = NULL;
+void *dest = *begin;
+void *src = insert_begin;
+// special case: list is empty
+if (dest == NULL) {
+*begin = src;
+if (end != NULL) {
+*end = cx_linked_list_last(src, loc_next);
+}
+return;
+}
+// search the list for insertion points
+while (dest != NULL && src != NULL) {
+// compare current list node with source node
+// if less or equal, skip
+if (cmp_func(dest, src) <= 0) {
+dest_prev = dest;
+dest = ll_next(dest);
+continue;
+}
+// determine chain of elements that can be inserted
+void *end_of_chain = src;
+void *next_in_chain = ll_next(src);
+while (next_in_chain != NULL) {
+// once we become larger than the list elem, break
+if (cmp_func(dest, next_in_chain) <= 0) {
+break;
+}
+// otherwise, we can insert one more
+end_of_chain = next_in_chain;
+next_in_chain = ll_next(next_in_chain);
+}
+// insert the elements
+if (dest_prev == NULL) {
+// new begin
+*begin = src;
+} else {
+cx_linked_list_link(dest_prev, src, loc_prev, loc_next);
+}
+cx_linked_list_link(end_of_chain, dest, loc_prev, loc_next);
+// continue with next
+src = next_in_chain;
+dest_prev = dest;
+dest = ll_next(dest);
+}
+// insert remaining items
+if (src != NULL) {
+cx_linked_list_link(dest_prev, src, loc_prev, loc_next);
+}
+// determine new end of list, if requested
+if (end != NULL) {
+*end = cx_linked_list_last(
+dest != NULL ? dest : dest_prev, loc_next);
+}
+}
+size_t cx_linked_list_remove_chain(
+void **begin,
+void **end,
+ptrdiff_t loc_prev,
+ptrdiff_t loc_next,
+void *node,
+size_t num
 ) {
 assert(node != NULL);
 assert(loc_next >= 0);
 assert(loc_prev >= 0 || begin != NULL);
+// easy exit
+if (num == 0) return 0;
 // find adjacent nodes
-void *next = ll_next(node);
 void *prev;
 if (loc_prev >= 0) {
 prev = ll_prev(node);
 } else {
 prev = cx_linked_list_prev(*begin, loc_next, node);
+}
+void *next = ll_next(node);
+size_t removed = 1;
+for (; removed < num && next != NULL ; removed++) {
+next = ll_next(next);
 }
 // update next pointer of prev node, or set begin
 if (prev == NULL) {
 if (begin != NULL) {
 *end = prev;
 }
 } else if (loc_prev >= 0) {
 ll_prev(next) = prev;
 }
+return removed;
 }
 size_t cx_linked_list_size(
-void const *node,
+const void *node,
 ptrdiff_t loc_next
 ) {
 assert(loc_next >= 0);
 size_t size = 0;
 while (node != NULL) {
 n++;
 }
 // Update pointer
 if (loc_prev >= 0) ll_prev(sorted[0]) = NULL;
-cx_for_n (i, length - 1) {
+for (size_t i = 0 ; i < length - 1; i++) {
 cx_linked_list_link(sorted[i], sorted[i + 1], loc_prev, loc_next);
 }
 ll_next(sorted[length - 1]) = NULL;
 *begin = sorted[0];
-*end = sorted[length-1];
+*end = sorted[length - 1];
 if (sorted != sbo) {
 free(sorted);
 }
 }
 if (end) *end = sorted_end;
 }
 }
 int cx_linked_list_compare(
-void const *begin_left,
+const void *begin_left,
-void const *begin_right,
+const void *begin_right,
 ptrdiff_t loc_advance,
 ptrdiff_t loc_data,
 cx_compare_func cmp_func
 ) {
-void const *left = begin_left, *right = begin_right;
+const void *left = begin_left, *right = begin_right;
 while (left != NULL && right != NULL) {
-void const *left_data = ll_data(left);
+const void *left_data = ll_data(left);
-void const *right_data = ll_data(right);
+const void *right_data = ll_data(right);
 int result = cmp_func(left_data, right_data);
 if (result != 0) return result;
 left = ll_advance(left);
 right = ll_advance(right);
 }
 cx_linked_list_node *begin;
 cx_linked_list_node *end;
 } cx_linked_list;
 static cx_linked_list_node *cx_ll_node_at(
-cx_linked_list const *list,
+const cx_linked_list *list,
 size_t index
 ) {
 if (index >= list->base.collection.size) {
 return NULL;
 } else if (index > list->base.collection.size / 2) {
 } else {
 return cx_linked_list_at(list->begin, 0, CX_LL_LOC_NEXT, index);
 }
 }
+static cx_linked_list_node *cx_ll_malloc_node(const struct cx_list_s *list) {
+return cxMalloc(list->collection.allocator,
+sizeof(cx_linked_list_node) + list->collection.elem_size);
+}
 static int cx_ll_insert_at(
 struct cx_list_s *list,
 cx_linked_list_node *node,
-void const *elem
+const void *elem
 ) {
 // create the new new_node
-cx_linked_list_node *new_node = cxMalloc(list->collection.allocator,
+cx_linked_list_node *new_node = cx_ll_malloc_node(list);
-sizeof(cx_linked_list_node) + list->collection.elem_size);
 // sortir if failed
 if (new_node == NULL) return 1;
 // initialize new new_node
 }
 static size_t cx_ll_insert_array(
 struct cx_list_s *list,
 size_t index,
-void const *array,
+const void *array,
 size_t n
 ) {
 // out-of bounds and corner case check
 if (index > list->collection.size || n == 0) return 0;
 // find position efficiently
 cx_linked_list_node *node = index == 0 ? NULL : cx_ll_node_at((cx_linked_list *) list, index - 1);
 // perform first insert
-if (0 != cx_ll_insert_at(list, node, array)) {
+if (0 != cx_ll_insert_at(list, node, array)) return 1;
-return 1;
-}
 // is there more?
 if (n == 1) return 1;
 // we now know exactly where we are
 node = node == NULL ? ((cx_linked_list *) list)->begin : node->next;
-// we can add the remaining nodes and immedately advance to the inserted node
+// we can add the remaining nodes and immediately advance to the inserted node
-char const *source = array;
+const char *source = array;
 for (size_t i = 1; i < n; i++) {
 source += list->collection.elem_size;
-if (0 != cx_ll_insert_at(list, node, source)) {
+if (0 != cx_ll_insert_at(list, node, source)) return i;
-return i;
-}
 node = node->next;
 }
 return n;
 }
 static int cx_ll_insert_element(
 struct cx_list_s *list,
 size_t index,
-void const *element
+const void *element
 ) {
 return 1 != cx_ll_insert_array(list, index, element, 1);
 }
-static int cx_ll_remove(
+static _Thread_local cx_compare_func cx_ll_insert_sorted_cmp_func;
+static int cx_ll_insert_sorted_cmp_helper(const void *l, const void *r) {
+const cx_linked_list_node *left = l;
+const cx_linked_list_node *right = r;
+return cx_ll_insert_sorted_cmp_func(left->payload, right->payload);
+}
+static size_t cx_ll_insert_sorted(
 struct cx_list_s *list,
-size_t index
+const void *array,
+size_t n
+) {
+// special case
+if (n == 0) return 0;
+// create a new chain of nodes
+cx_linked_list_node *chain = cx_ll_malloc_node(list);
+if (chain == NULL) return 0;
+memcpy(chain->payload, array, list->collection.elem_size);
+chain->prev = NULL;
+chain->next = NULL;
+// add all elements from the array to that chain
+cx_linked_list_node *prev = chain;
+const char *src = array;
+size_t inserted = 1;
+for (; inserted < n; inserted++) {
+cx_linked_list_node *next = cx_ll_malloc_node(list);
+if (next == NULL) break;
+src += list->collection.elem_size;
+memcpy(next->payload, src, list->collection.elem_size);
+prev->next = next;
+next->prev = prev;
+prev = next;
+}
+prev->next = NULL;
+// invoke the low level function
+cx_linked_list *ll = (cx_linked_list *) list;
+cx_ll_insert_sorted_cmp_func = list->collection.cmpfunc;
+cx_linked_list_insert_sorted_chain(
+(void **) &ll->begin,
+(void **) &ll->end,
+CX_LL_LOC_PREV,
+CX_LL_LOC_NEXT,
+chain,
+cx_ll_insert_sorted_cmp_helper
+);
+// adjust the list metadata
+list->collection.size += inserted;
+return inserted;
+}
+static size_t cx_ll_remove(
+struct cx_list_s *list,
+size_t index,
+size_t num,
+void *targetbuf
 ) {
 cx_linked_list *ll = (cx_linked_list *) list;
 cx_linked_list_node *node = cx_ll_node_at(ll, index);
 // out-of-bounds check
-if (node == NULL) return 1;
+if (node == NULL) return 0;
-// element destruction
-cx_invoke_destructor(list, node->payload);
 // remove
-cx_linked_list_remove((void **) &ll->begin, (void **) &ll->end,
+size_t removed = cx_linked_list_remove_chain(
-CX_LL_LOC_PREV, CX_LL_LOC_NEXT, node);
+(void **) &ll->begin,
+(void **) &ll->end,
+CX_LL_LOC_PREV,
+CX_LL_LOC_NEXT,
+node,
+num
+);
 // adjust size
-list->collection.size--;
+list->collection.size -= removed;
-// free and return
+// copy or destroy the removed chain
-cxFree(list->collection.allocator, node);
+if (targetbuf == NULL) {
+cx_linked_list_node *n = node;
-return 0;
+for (size_t i = 0; i < removed; i++) {
+// element destruction
+cx_invoke_destructor(list, n->payload);
+// free the node and advance
+void *next = n->next;
+cxFree(list->collection.allocator, n);
+n = next;
+}
+} else {
+char *dest = targetbuf;
+cx_linked_list_node *n = node;
+for (size_t i = 0; i < removed; i++) {
+// copy payload
+memcpy(dest, n->payload, list->collection.elem_size);
+// advance target buffer
+dest += list->collection.elem_size;
+// free the node and advance
+void *next = n->next;
+cxFree(list->collection.allocator, n);
+n = next;
+}
+}
+return removed;
 }
 static void cx_ll_clear(struct cx_list_s *list) {
 if (list->collection.size == 0) return;
 }
 #ifndef CX_LINKED_LIST_SWAP_SBO_SIZE
 #define CX_LINKED_LIST_SWAP_SBO_SIZE 128
 #endif
-unsigned cx_linked_list_swap_sbo_size = CX_LINKED_LIST_SWAP_SBO_SIZE;
+const unsigned cx_linked_list_swap_sbo_size = CX_LINKED_LIST_SWAP_SBO_SIZE;
 static int cx_ll_swap(
 struct cx_list_s *list,
 size_t i,
 size_t j
 right = j;
 } else {
 left = j;
 right = i;
 }
-cx_linked_list_node *nleft, *nright;
+cx_linked_list_node *nleft = NULL, *nright = NULL;
 if (left < mid && right < mid) {
 // case 1: both items left from mid
 nleft = cx_ll_node_at(ll, left);
 assert(nleft != NULL);
 nright = nleft;
 return 0;
 }
 static void *cx_ll_at(
-struct cx_list_s const *list,
+const struct cx_list_s *list,
 size_t index
 ) {
 cx_linked_list *ll = (cx_linked_list *) list;
 cx_linked_list_node *node = cx_ll_node_at(ll, index);
 return node == NULL ? NULL : node->payload;
 }
 static ssize_t cx_ll_find_remove(
 struct cx_list_s *list,
-void const *elem,
+const void *elem,
 bool remove
 ) {
 if (remove) {
 cx_linked_list *ll = ((cx_linked_list *) list);
 cx_linked_list_node *node;
 cx_linked_list *ll = (cx_linked_list *) list;
 cx_linked_list_reverse((void **) &ll->begin, (void **) &ll->end, CX_LL_LOC_PREV, CX_LL_LOC_NEXT);
 }
 static int cx_ll_compare(
-struct cx_list_s const *list,
+const struct cx_list_s *list,
-struct cx_list_s const *other
+const struct cx_list_s *other
 ) {
 cx_linked_list *left = (cx_linked_list *) list;
 cx_linked_list *right = (cx_linked_list *) other;
 return cx_linked_list_compare(left->begin, right->begin,
 CX_LL_LOC_NEXT, CX_LL_LOC_DATA,
 list->collection.cmpfunc);
 }
-static bool cx_ll_iter_valid(void const *it) {
+static bool cx_ll_iter_valid(const void *it) {
-struct cx_iterator_s const *iter = it;
+const struct cx_iterator_s *iter = it;
 return iter->elem_handle != NULL;
 }
 static void cx_ll_iter_next(void *it) {
 struct cx_iterator_s *iter = it;
 cx_linked_list_node *node = iter->elem_handle;
 iter->elem_handle = node->prev;
 }
 }
-static void *cx_ll_iter_current(void const *it) {
+static void *cx_ll_iter_current(const void *it) {
-struct cx_iterator_s const *iter = it;
+const struct cx_iterator_s *iter = it;
 cx_linked_list_node *node = iter->elem_handle;
 return node->payload;
 }
 static CxIterator cx_ll_iterator(
-struct cx_list_s const *list,
+const struct cx_list_s *list,
 size_t index,
 bool backwards
 ) {
 CxIterator iter;
 iter.index = index;
 iter.src_handle.c = list;
-iter.elem_handle = cx_ll_node_at((cx_linked_list const *) list, index);
+iter.elem_handle = cx_ll_node_at((const cx_linked_list *) list, index);
 iter.elem_size = list->collection.elem_size;
 iter.elem_count = list->collection.size;
 iter.base.valid = cx_ll_iter_valid;
 iter.base.current = cx_ll_iter_current;
 iter.base.next = backwards ? cx_ll_iter_prev : cx_ll_iter_next;
 return iter;
 }
 static int cx_ll_insert_iter(
 CxIterator *iter,
-void const *elem,
+const void *elem,
 int prepend
 ) {
 struct cx_list_s *list = iter->src_handle.m;
 cx_linked_list_node *node = iter->elem_handle;
 if (node != NULL) {
 assert(prepend >= 0 && prepend <= 1);
 cx_linked_list_node *choice[2] = {node, node->prev};
 int result = cx_ll_insert_at(list, choice[prepend], elem);
-iter->index += prepend * (0 == result);
+if (result == 0) {
+iter->elem_count++;
+if (prepend) {
+iter->index++;
+}
+}
 return result;
 } else {
 int result = cx_ll_insert_element(list, list->collection.size, elem);
-iter->index = list->collection.size;
+if (result == 0) {
+iter->elem_count++;
+iter->index = list->collection.size;
+}
 return result;
 }
 }
 static void cx_ll_destructor(CxList *list) {
 static cx_list_class cx_linked_list_class = {
 cx_ll_destructor,
 cx_ll_insert_element,
 cx_ll_insert_array,
+cx_ll_insert_sorted,
 cx_ll_insert_iter,
 cx_ll_remove,
 cx_ll_clear,
 cx_ll_swap,
 cx_ll_at,
 cx_ll_reverse,
 cx_ll_iterator,
 };
 CxList *cxLinkedListCreate(
-CxAllocator const *allocator,
+const CxAllocator *allocator,
 cx_compare_func comparator,
 size_t elem_size
 ) {
 if (allocator == NULL) {
 allocator = cxDefaultAllocator;

comparison: ucx/linked_list.c

ucx/linked_list.c

Mercurial > hg > dbutils / file comparison

comparison: ucx/linked_list.c

ucx/linked_list.c