--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/array_list.c Fri Apr 21 21:25:32 2023 +0200
@@ -0,0 +1,529 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "cx/array_list.h"
+#include <assert.h>
+#include <string.h>
+
+// LOW LEVEL ARRAY LIST FUNCTIONS
+
+enum cx_array_copy_result cx_array_copy(
+ void **target,
+ size_t *size,
+ size_t *capacity,
+ size_t index,
+ void const *src,
+ size_t elem_size,
+ size_t elem_count,
+ struct cx_array_reallocator_s *reallocator
+) {
+ // assert pointers
+ assert(target != NULL);
+ assert(size != NULL);
+ assert(src != NULL);
+
+ // determine capacity
+ size_t cap = capacity == NULL ? *size : *capacity;
+
+ // check if resize is required
+ size_t minsize = index + elem_count;
+ size_t newsize = *size < minsize ? minsize : *size;
+ bool needrealloc = newsize > cap;
+
+ // reallocate if possible
+ if (needrealloc) {
+ // a reallocator and a capacity variable must be available
+ if (reallocator == NULL || capacity == NULL) {
+ return CX_ARRAY_COPY_REALLOC_NOT_SUPPORTED;
+ }
+
+ // check, if we need to repair the src pointer
+ uintptr_t targetaddr = (uintptr_t) *target;
+ uintptr_t srcaddr = (uintptr_t) src;
+ bool repairsrc = targetaddr <= srcaddr
+ && srcaddr < targetaddr + cap * elem_size;
+
+ // calculate new capacity (next number divisible by 16)
+ cap = newsize - (newsize % 16) + 16;
+ assert(cap > newsize);
+
+ // perform reallocation
+ void *newmem = reallocator->realloc(
+ *target, cap, elem_size, reallocator
+ );
+ if (newmem == NULL) {
+ return CX_ARRAY_COPY_REALLOC_FAILED;
+ }
+
+ // repair src pointer, if necessary
+ if (repairsrc) {
+ src = ((char *) newmem) + (srcaddr - targetaddr);
+ }
+
+ // store new pointer and capacity
+ *target = newmem;
+ *capacity = cap;
+ }
+
+ // determine target pointer
+ char *start = *target;
+ start += index * elem_size;
+
+ // copy elements and set new size
+ memmove(start, src, elem_count * elem_size);
+ *size = newsize;
+
+ // return successfully
+ return CX_ARRAY_COPY_SUCCESS;
+}
+
+#ifndef CX_ARRAY_SWAP_SBO_SIZE
+#define CX_ARRAY_SWAP_SBO_SIZE 512
+#endif
+
+void cx_array_swap(
+ void *arr,
+ size_t elem_size,
+ size_t idx1,
+ size_t idx2
+) {
+ assert(arr != NULL);
+
+ // short circuit
+ if (idx1 == idx2) return;
+
+ char sbo_mem[CX_ARRAY_SWAP_SBO_SIZE];
+ void *tmp;
+
+ // decide if we can use the local buffer
+ if (elem_size > CX_ARRAY_SWAP_SBO_SIZE) {
+ tmp = malloc(elem_size);
+ // we don't want to enforce error handling
+ if (tmp == NULL) abort();
+ } else {
+ tmp = sbo_mem;
+ }
+
+ // calculate memory locations
+ char *left = arr, *right = arr;
+ left += idx1 * elem_size;
+ right += idx2 * elem_size;
+
+ // three-way swap
+ memcpy(tmp, left, elem_size);
+ memcpy(left, right, elem_size);
+ memcpy(right, tmp, elem_size);
+
+ // free dynamic memory, if it was needed
+ if (tmp != sbo_mem) {
+ free(tmp);
+ }
+}
+
+// HIGH LEVEL ARRAY LIST FUNCTIONS
+
+typedef struct {
+ struct cx_list_s base;
+ void *data;
+ size_t capacity;
+ struct cx_array_reallocator_s reallocator;
+} cx_array_list;
+
+static void *cx_arl_realloc(
+ void *array,
+ size_t capacity,
+ size_t elem_size,
+ struct cx_array_reallocator_s *alloc
+) {
+ // retrieve the pointer to the list allocator
+ CxAllocator const *al = alloc->ptr1;
+
+ // use the list allocator to reallocate the memory
+ return cxRealloc(al, array, capacity * elem_size);
+}
+
+static void cx_arl_destructor(struct cx_list_s *list) {
+ cx_array_list *arl = (cx_array_list *) list;
+ cxFree(list->allocator, arl->data);
+}
+
+static size_t cx_arl_insert_array(
+ struct cx_list_s *list,
+ size_t index,
+ void const *array,
+ size_t n
+) {
+ // out of bounds and special case check
+ if (index > list->size || n == 0) return 0;
+
+ // get a correctly typed pointer to the list
+ cx_array_list *arl = (cx_array_list *) list;
+
+ // do we need to move some elements?
+ if (index < list->size) {
+ char const *first_to_move = (char const *) arl->data;
+ first_to_move += index * list->item_size;
+ size_t elems_to_move = list->size - index;
+ size_t start_of_moved = index + n;
+
+ if (CX_ARRAY_COPY_SUCCESS != cx_array_copy(
+ &arl->data,
+ &list->size,
+ &arl->capacity,
+ start_of_moved,
+ first_to_move,
+ list->item_size,
+ elems_to_move,
+ &arl->reallocator
+ )) {
+ // if moving existing elems is unsuccessful, abort
+ return 0;
+ }
+ }
+
+ // note that if we had to move the elements, the following operation
+ // is guaranteed to succeed, because we have the memory already allocated
+ // therefore, it is impossible to leave this function with an invalid array
+
+ // place the new elements
+ if (CX_ARRAY_COPY_SUCCESS == cx_array_copy(
+ &arl->data,
+ &list->size,
+ &arl->capacity,
+ index,
+ array,
+ list->item_size,
+ n,
+ &arl->reallocator
+ )) {
+ return n;
+ } else {
+ // array list implementation is "all or nothing"
+ return 0;
+ }
+}
+
+static int cx_arl_insert_element(
+ struct cx_list_s *list,
+ size_t index,
+ void const *element
+) {
+ return 1 != cx_arl_insert_array(list, index, element, 1);
+}
+
+static int cx_arl_insert_iter(
+ struct cx_mut_iterator_s *iter,
+ void const *elem,
+ int prepend
+) {
+ struct cx_list_s *list = iter->src_handle;
+ if (iter->index < list->size) {
+ int result = cx_arl_insert_element(
+ list,
+ iter->index + 1 - prepend,
+ elem
+ );
+ if (result == 0 && prepend != 0) {
+ iter->index++;
+ iter->elem_handle = ((char *) iter->elem_handle) + list->item_size;
+ }
+ return result;
+ } else {
+ int result = cx_arl_insert_element(list, list->size, elem);
+ iter->index = list->size;
+ return result;
+ }
+}
+
+static int cx_arl_remove(
+ struct cx_list_s *list,
+ size_t index
+) {
+ cx_array_list *arl = (cx_array_list *) list;
+
+ // out-of-bounds check
+ if (index >= list->size) {
+ return 1;
+ }
+
+ // content destruction
+ cx_invoke_destructor(list, ((char *) arl->data) + index * list->item_size);
+
+ // short-circuit removal of last element
+ if (index == list->size - 1) {
+ list->size--;
+ return 0;
+ }
+
+ // just move the elements starting at index to the left
+ int result = cx_array_copy(
+ &arl->data,
+ &list->size,
+ &arl->capacity,
+ index,
+ ((char *) arl->data) + (index + 1) * list->item_size,
+ list->item_size,
+ list->size - index - 1,
+ &arl->reallocator
+ );
+ if (result == 0) {
+ // decrease the size
+ list->size--;
+ }
+ return result;
+}
+
+static void cx_arl_clear(struct cx_list_s *list) {
+ if (list->size == 0) return;
+
+ cx_array_list *arl = (cx_array_list *) list;
+ char *ptr = arl->data;
+
+ if (list->simple_destructor) {
+ for (size_t i = 0; i < list->size; i++) {
+ cx_invoke_simple_destructor(list, ptr);
+ ptr += list->item_size;
+ }
+ }
+ if (list->advanced_destructor) {
+ for (size_t i = 0; i < list->size; i++) {
+ cx_invoke_advanced_destructor(list, ptr);
+ ptr += list->item_size;
+ }
+ }
+
+ memset(arl->data, 0, list->size * list->item_size);
+ list->size = 0;
+}
+
+static int cx_arl_swap(
+ struct cx_list_s *list,
+ size_t i,
+ size_t j
+) {
+ if (i >= list->size || j >= list->size) return 1;
+ cx_array_list *arl = (cx_array_list *) list;
+ cx_array_swap(arl->data, list->item_size, i, j);
+ return 0;
+}
+
+static void *cx_arl_at(
+ struct cx_list_s const *list,
+ size_t index
+) {
+ if (index < list->size) {
+ cx_array_list const *arl = (cx_array_list const *) list;
+ char *space = arl->data;
+ return space + index * list->item_size;
+ } else {
+ return NULL;
+ }
+}
+
+static size_t cx_arl_find(
+ struct cx_list_s const *list,
+ void const *elem
+) {
+ assert(list->cmpfunc != NULL);
+ char *cur = ((cx_array_list const *) list)->data;
+
+ for (size_t i = 0; i < list->size; i++) {
+ if (0 == list->cmpfunc(elem, cur)) {
+ return i;
+ }
+ cur += list->item_size;
+ }
+
+ return list->size;
+}
+
+static void cx_arl_sort(struct cx_list_s *list) {
+ assert(list->cmpfunc != NULL);
+ qsort(((cx_array_list *) list)->data,
+ list->size,
+ list->item_size,
+ list->cmpfunc
+ );
+}
+
+static int cx_arl_compare(
+ struct cx_list_s const *list,
+ struct cx_list_s const *other
+) {
+ assert(list->cmpfunc != NULL);
+ if (list->size == other->size) {
+ char const *left = ((cx_array_list const *) list)->data;
+ char const *right = ((cx_array_list const *) other)->data;
+ for (size_t i = 0; i < list->size; i++) {
+ int d = list->cmpfunc(left, right);
+ if (d != 0) {
+ return d;
+ }
+ left += list->item_size;
+ right += other->item_size;
+ }
+ return 0;
+ } else {
+ return list->size < other->size ? -1 : 1;
+ }
+}
+
+static void cx_arl_reverse(struct cx_list_s *list) {
+ if (list->size < 2) return;
+ void *data = ((cx_array_list const *) list)->data;
+ size_t half = list->size / 2;
+ for (size_t i = 0; i < half; i++) {
+ cx_array_swap(data, list->item_size, i, list->size - 1 - i);
+ }
+}
+
+static bool cx_arl_iter_valid(void const *it) {
+ struct cx_iterator_s const *iter = it;
+ struct cx_list_s const *list = iter->src_handle;
+ return iter->index < list->size;
+}
+
+static void *cx_arl_iter_current(void const *it) {
+ struct cx_iterator_s const *iter = it;
+ return iter->elem_handle;
+}
+
+static void cx_arl_iter_next(void *it) {
+ struct cx_iterator_base_s *itbase = it;
+ if (itbase->remove) {
+ struct cx_mut_iterator_s *iter = it;
+ itbase->remove = false;
+ cx_arl_remove(iter->src_handle, iter->index);
+ } else {
+ struct cx_iterator_s *iter = it;
+ iter->index++;
+ iter->elem_handle =
+ ((char *) iter->elem_handle)
+ + ((struct cx_list_s const *) iter->src_handle)->item_size;
+ }
+}
+
+static void cx_arl_iter_prev(void *it) {
+ struct cx_iterator_base_s *itbase = it;
+ struct cx_mut_iterator_s *iter = it;
+ cx_array_list *const list = iter->src_handle;
+ if (itbase->remove) {
+ itbase->remove = false;
+ cx_arl_remove(iter->src_handle, iter->index);
+ }
+ iter->index--;
+ if (iter->index < list->base.size) {
+ iter->elem_handle = ((char *) list->data)
+ + iter->index * list->base.item_size;
+ }
+}
+
+static bool cx_arl_iter_flag_rm(void *it) {
+ struct cx_iterator_base_s *iter = it;
+ if (iter->mutating) {
+ iter->remove = true;
+ return true;
+ } else {
+ return false;
+ }
+}
+
+static struct cx_iterator_s cx_arl_iterator(
+ struct cx_list_s const *list,
+ size_t index,
+ bool backwards
+) {
+ struct cx_iterator_s iter;
+
+ iter.index = index;
+ iter.src_handle = list;
+ iter.elem_handle = cx_arl_at(list, index);
+ iter.base.valid = cx_arl_iter_valid;
+ iter.base.current = cx_arl_iter_current;
+ iter.base.next = backwards ? cx_arl_iter_prev : cx_arl_iter_next;
+ iter.base.flag_removal = cx_arl_iter_flag_rm;
+ iter.base.remove = false;
+ iter.base.mutating = false;
+
+ return iter;
+}
+
+static cx_list_class cx_array_list_class = {
+ cx_arl_destructor,
+ cx_arl_insert_element,
+ cx_arl_insert_array,
+ cx_arl_insert_iter,
+ cx_arl_remove,
+ cx_arl_clear,
+ cx_arl_swap,
+ cx_arl_at,
+ cx_arl_find,
+ cx_arl_sort,
+ cx_arl_compare,
+ cx_arl_reverse,
+ cx_arl_iterator,
+};
+
+CxList *cxArrayListCreate(
+ CxAllocator const *allocator,
+ cx_compare_func comparator,
+ size_t item_size,
+ size_t initial_capacity
+) {
+ if (allocator == NULL) {
+ allocator = cxDefaultAllocator;
+ }
+
+ cx_array_list *list = cxCalloc(allocator, 1, sizeof(cx_array_list));
+ if (list == NULL) return NULL;
+
+ list->base.cl = &cx_array_list_class;
+ list->base.allocator = allocator;
+ list->base.cmpfunc = comparator;
+ list->capacity = initial_capacity;
+
+ if (item_size > 0) {
+ list->base.item_size = item_size;
+ } else {
+ item_size = sizeof(void *);
+ cxListStorePointers((CxList *) list);
+ }
+
+ // allocate the array after the real item_size is known
+ list->data = cxCalloc(allocator, initial_capacity, item_size);
+ if (list->data == NULL) {
+ cxFree(allocator, list);
+ return NULL;
+ }
+
+ // configure the reallocator
+ list->reallocator.realloc = cx_arl_realloc;
+ list->reallocator.ptr1 = (void *) allocator;
+
+ return (CxList *) list;
+}