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+++ b/ucx/cx/array_list.h Sat Dec 07 18:56:37 2024 +0100
@@ -0,0 +1,273 @@
+/*
+ * 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.
+ */
+/**
+ * \file array_list.h
+ * \brief Array list implementation.
+ * \details Also provides several low-level functions for custom array list implementations.
+ * \author Mike Becker
+ * \author Olaf Wintermann
+ * \copyright 2-Clause BSD License
+ */
+
+
+#ifndef UCX_ARRAY_LIST_H
+#define UCX_ARRAY_LIST_H
+
+#include "list.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * The maximum item size in an array list that fits into stack buffer when swapped.
+ */
+extern unsigned cx_array_swap_sbo_size;
+
+/**
+ * Declares variables for an array that can be used with the convenience macros.
+ *
+ * @see cx_array_simple_add()
+ * @see cx_array_simple_copy()
+ * @see cx_array_initialize()
+ */
+#define CX_ARRAY_DECLARE(type, name) \
+ type * name; \
+ size_t name##_size; \
+ size_t name##_capacity
+
+/**
+ * Initializes an array declared with CX_ARRAY_DECLARE().
+ *
+ * The memory for the array is allocated with stdlib malloc().
+ * @param array the array
+ * @param capacity the initial capacity
+ */
+#define cx_array_initialize(array, capacity) \
+ array##_capacity = capacity; \
+ array##_size = 0; \
+ array = malloc(sizeof(array[0]) * capacity)
+
+/**
+ * Defines a reallocation mechanism for arrays.
+ */
+struct cx_array_reallocator_s {
+ /**
+ * Reallocates space for the given array.
+ *
+ * Implementations are not required to free the original array.
+ * This allows reallocation of static memory by allocating heap memory
+ * and copying the array contents. The information in the custom fields of
+ * the referenced allocator can be used to track the state of the memory
+ * or to transport other additional data.
+ *
+ * @param array the array to reallocate
+ * @param capacity the new capacity (number of elements)
+ * @param elem_size the size of each element
+ * @param alloc a reference to this allocator
+ * @return a pointer to the reallocated memory or \c NULL on failure
+ */
+ void *(*realloc)(
+ void *array,
+ size_t capacity,
+ size_t elem_size,
+ struct cx_array_reallocator_s *alloc
+ );
+
+ /**
+ * Custom data pointer.
+ */
+ void *ptr1;
+ /**
+ * Custom data pointer.
+ */
+ void *ptr2;
+ /**
+ * Custom data integer.
+ */
+ size_t int1;
+ /**
+ * Custom data integer.
+ */
+ size_t int2;
+};
+
+/**
+ * A default stdlib-based array reallocator.
+ */
+extern struct cx_array_reallocator_s *cx_array_default_reallocator;
+
+/**
+ * Return codes for array functions.
+ */
+enum cx_array_result {
+ CX_ARRAY_SUCCESS,
+ CX_ARRAY_REALLOC_NOT_SUPPORTED,
+ CX_ARRAY_REALLOC_FAILED,
+};
+
+/**
+ * Copies elements from one array to another.
+ *
+ * The elements are copied to the \p target array at the specified \p index,
+ * overwriting possible elements. The \p index does not need to be in range of
+ * the current array \p size. If the new index plus the number of elements added
+ * would extend the array's size, and \p capacity is not \c NULL, the remaining
+ * capacity is used.
+ *
+ * If the capacity is insufficient to hold the new data, a reallocation
+ * attempt is made, unless the \p reallocator is set to \c NULL, in which case
+ * this function ultimately returns a failure.
+ *
+ * @param target a pointer to the target array
+ * @param size a pointer to the size of the target array
+ * @param capacity a pointer to the target array's capacity -
+ * \c NULL if only the size shall be used to bound the array
+ * @param index the index where the copied elements shall be placed
+ * @param src the source array
+ * @param elem_size the size of one element
+ * @param elem_count the number of elements to copy
+ * @param reallocator the array reallocator to use, or \c NULL
+ * if reallocation shall not happen
+ * @return zero on success, non-zero error code on failure
+ */
+enum cx_array_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
+) __attribute__((__nonnull__(1, 2, 5)));
+
+/**
+ * Convenience macro that uses cx_array_copy() with a default layout and the default reallocator.
+ *
+ * @param array the name of the array (NOT a pointer to the array)
+ * @param index the index where the copied elements shall be placed
+ * @param src the source array
+ * @param count the number of elements to copy
+ */
+#define cx_array_simple_copy(array, index, src, count) \
+ cx_array_copy((void**)&(array), &(array##_size), &(array##_capacity), \
+ index, src, sizeof((array)[0]), count, cx_array_default_reallocator)
+
+/**
+ * Adds an element to an array with the possibility of allocating more space.
+ *
+ * The element \p elem is added to the end of the \p target array which containing
+ * \p size elements, already. The \p capacity must not be \c NULL and point a
+ * variable holding the current maximum number of elements the array can hold.
+ *
+ * If the capacity is insufficient to hold the new element, and the optional
+ * \p reallocator is not \c NULL, an attempt increase the \p capacity is made
+ * and the new capacity is written back.
+ *
+ * @param target a pointer to the target array
+ * @param size a pointer to the size of the target array
+ * @param capacity a pointer to the target array's capacity - must not be \c NULL
+ * @param elem_size the size of one element
+ * @param elem a pointer to the element to add
+ * @param reallocator the array reallocator to use, or \c NULL if reallocation shall not happen
+ * @return zero on success, non-zero error code on failure
+ */
+#define cx_array_add(target, size, capacity, elem_size, elem, reallocator) \
+ cx_array_copy((void**)(target), size, capacity, *(size), elem, elem_size, 1, reallocator)
+
+/**
+ * Convenience macro that uses cx_array_add() with a default layout and the default reallocator.
+ *
+ * @param array the name of the array (NOT a pointer to the array)
+ * @param elem the element to add (NOT a pointer, address is automatically taken)
+ */
+#define cx_array_simple_add(array, elem) \
+ cx_array_simple_copy(array, array##_size, &(elem), 1)
+
+/**
+ * Swaps two array elements.
+ *
+ * @param arr the array
+ * @param elem_size the element size
+ * @param idx1 index of first element
+ * @param idx2 index of second element
+ */
+void cx_array_swap(
+ void *arr,
+ size_t elem_size,
+ size_t idx1,
+ size_t idx2
+) __attribute__((__nonnull__));
+
+/**
+ * Allocates an array list for storing elements with \p elem_size bytes each.
+ *
+ * If \p elem_size is CX_STORE_POINTERS, the created list will be created as if
+ * cxListStorePointers() was called immediately after creation and the compare
+ * function will be automatically set to cx_cmp_ptr(), if none is given.
+ *
+ * @param allocator the allocator for allocating the list memory
+ * (if \c NULL the cxDefaultAllocator will be used)
+ * @param comparator the comparator for the elements
+ * (if \c NULL, and the list is not storing pointers, sort and find
+ * functions will not work)
+ * @param elem_size the size of each element in bytes
+ * @param initial_capacity the initial number of elements the array can store
+ * @return the created list
+ */
+CxList *cxArrayListCreate(
+ CxAllocator const *allocator,
+ cx_compare_func comparator,
+ size_t elem_size,
+ size_t initial_capacity
+);
+
+/**
+ * Allocates an array list for storing elements with \p elem_size bytes each.
+ *
+ * The list will use the cxDefaultAllocator and \em NO compare function.
+ * If you want to call functions that need a compare function, you have to
+ * set it immediately after creation or use cxArrayListCreate().
+ *
+ * If \p elem_size is CX_STORE_POINTERS, the created list will be created as if
+ * cxListStorePointers() was called immediately after creation and the compare
+ * function will be automatically set to cx_cmp_ptr().
+ *
+ * @param elem_size the size of each element in bytes
+ * @param initial_capacity the initial number of elements the array can store
+ * @return the created list
+ */
+#define cxArrayListCreateSimple(elem_size, initial_capacity) \
+ cxArrayListCreate(NULL, NULL, elem_size, initial_capacity)
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // UCX_ARRAY_LIST_H