/*
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* $Id: arraylist.c,v 1.4 2006/01/26 02:16:28 mclark Exp $
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*
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* Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd.
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* Michael Clark <michael@metaparadigm.com>
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the MIT license. See COPYING for details.
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*
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*/
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#include "config.h"
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#include <limits.h>
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#ifdef STDC_HEADERS
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#include <stdlib.h>
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#include <string.h>
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#endif /* STDC_HEADERS */
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#if defined(HAVE_STRINGS_H) && !defined(_STRING_H) && !defined(__USE_BSD)
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#include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#ifndef SIZE_T_MAX
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#if SIZEOF_SIZE_T == SIZEOF_INT
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#define SIZE_T_MAX UINT_MAX
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#elif SIZEOF_SIZE_T == SIZEOF_LONG
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#define SIZE_T_MAX ULONG_MAX
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#elif SIZEOF_SIZE_T == SIZEOF_LONG_LONG
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#define SIZE_T_MAX ULLONG_MAX
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#else
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#error Unable to determine size of size_t
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#endif
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#endif
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#include "arraylist.h"
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struct array_list *array_list_new(array_list_free_fn *free_fn)
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{
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return array_list_new2(free_fn, ARRAY_LIST_DEFAULT_SIZE);
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}
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struct array_list *array_list_new2(array_list_free_fn *free_fn, int initial_size)
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{
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struct array_list *arr;
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if (initial_size < 0 || (size_t)initial_size >= SIZE_T_MAX / sizeof(void *))
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return NULL;
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arr = (struct array_list *)malloc(sizeof(struct array_list));
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if (!arr)
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return NULL;
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arr->size = initial_size;
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arr->length = 0;
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arr->free_fn = free_fn;
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if (!(arr->array = (void **)malloc(arr->size * sizeof(void *))))
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{
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free(arr);
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return NULL;
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}
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return arr;
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}
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extern void array_list_free(struct array_list *arr)
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{
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size_t i;
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for (i = 0; i < arr->length; i++)
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if (arr->array[i])
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arr->free_fn(arr->array[i]);
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free(arr->array);
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free(arr);
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}
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void *array_list_get_idx(struct array_list *arr, size_t i)
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{
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if (i >= arr->length)
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return NULL;
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return arr->array[i];
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}
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static int array_list_expand_internal(struct array_list *arr, size_t max)
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{
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void *t;
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size_t new_size;
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if (max < arr->size)
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return 0;
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/* Avoid undefined behaviour on size_t overflow */
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if (arr->size >= SIZE_T_MAX / 2)
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new_size = max;
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else
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{
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new_size = arr->size << 1;
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if (new_size < max)
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new_size = max;
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}
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if (new_size > (~((size_t)0)) / sizeof(void *))
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return -1;
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if (!(t = realloc(arr->array, new_size * sizeof(void *))))
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return -1;
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arr->array = (void **)t;
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arr->size = new_size;
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return 0;
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}
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int array_list_shrink(struct array_list *arr, size_t empty_slots)
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{
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void *t;
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size_t new_size;
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if (empty_slots >= SIZE_T_MAX / sizeof(void *) - arr->length)
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return -1;
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new_size = arr->length + empty_slots;
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if (new_size == arr->size)
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return 0;
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if (new_size > arr->size)
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return array_list_expand_internal(arr, new_size);
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if (new_size == 0)
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new_size = 1;
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if (!(t = realloc(arr->array, new_size * sizeof(void *))))
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return -1;
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arr->array = (void **)t;
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arr->size = new_size;
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return 0;
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}
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//static inline int _array_list_put_idx(struct array_list *arr, size_t idx, void *data)
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int array_list_put_idx(struct array_list *arr, size_t idx, void *data)
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{
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if (idx > SIZE_T_MAX - 1)
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return -1;
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if (array_list_expand_internal(arr, idx + 1))
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return -1;
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if (idx < arr->length && arr->array[idx])
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arr->free_fn(arr->array[idx]);
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arr->array[idx] = data;
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if (idx > arr->length)
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{
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/* Zero out the arraylist slots in between the old length
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and the newly added entry so we know those entries are
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empty.
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e.g. when setting array[7] in an array that used to be
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only 5 elements longs, array[5] and array[6] need to be
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set to 0.
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*/
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memset(arr->array + arr->length, 0, (idx - arr->length) * sizeof(void *));
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}
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if (arr->length <= idx)
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arr->length = idx + 1;
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return 0;
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}
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int array_list_add(struct array_list *arr, void *data)
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{
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/* Repeat some of array_list_put_idx() so we can skip several
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checks that we know are unnecessary when appending at the end
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*/
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size_t idx = arr->length;
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if (idx > SIZE_T_MAX - 1)
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return -1;
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if (array_list_expand_internal(arr, idx + 1))
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return -1;
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arr->array[idx] = data;
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arr->length++;
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return 0;
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}
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void array_list_sort(struct array_list *arr, int (*compar)(const void *, const void *))
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{
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qsort(arr->array, arr->length, sizeof(arr->array[0]), compar);
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}
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void *array_list_bsearch(const void **key, struct array_list *arr,
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int (*compar)(const void *, const void *))
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{
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return bsearch(key, arr->array, arr->length, sizeof(arr->array[0]), compar);
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}
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size_t array_list_length(struct array_list *arr)
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{
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return arr->length;
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}
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int array_list_del_idx(struct array_list *arr, size_t idx, size_t count)
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{
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size_t i, stop;
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/* Avoid overflow in calculation with large indices. */
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if (idx > SIZE_T_MAX - count)
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return -1;
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stop = idx + count;
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if (idx >= arr->length || stop > arr->length)
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return -1;
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for (i = idx; i < stop; ++i)
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{
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// Because put_idx can skip entries, we need to check if
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// there's actually anything in each slot we're erasing.
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if (arr->array[i])
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arr->free_fn(arr->array[i]);
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}
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memmove(arr->array + idx, arr->array + stop, (arr->length - stop) * sizeof(void *));
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arr->length -= count;
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return 0;
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}
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