ucx: src/cx/array_list.h@7970eac1c598 (annotated)

src/cx/array_list.h@7970eac1c598 (annotated)

src/cx/array_list.h

Sun, 18 Feb 2024 13:01:09 +0100

author: Mike Becker <universe@uap-core.de>
date: Sun, 18 Feb 2024 13:01:09 +0100
changeset 831: 7970eac1c598
parent 819: 5da2ead43077
child 832: 97df2e4c68fb
permissions: -rw-r--r--

add convenience macros for cx_array_*

 /*
  * 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()
  */
 #define cx_array_declare(type, name) \
     type * name;                     \
     size_t name##_size;              \
     size_t name##_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 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
  */
 #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 item_size bytes each.
  *
  * If \p item_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 item_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 item_size,
         size_t initial_capacity
 );
 /**
  * Allocates an array list for storing elements with \p item_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 item_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 item_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(item_size, initial_capacity) \
     cxArrayListCreate(NULL, NULL, item_size, initial_capacity)
 #ifdef __cplusplus
 } // extern "C"
 #endif
 #endif // UCX_ARRAY_LIST_H

Mercurial > hg > ucx / annotate

src/cx/array_list.h@7970eac1c598 (annotated)

src/cx/array_list.h