Cytoplasm/src/Array.c

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/*
* Copyright (C) 2022-2023 Jordan Bancino <@jordan:bancino.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <Array.h>
#ifndef ARRAY_BLOCK
#define ARRAY_BLOCK 16
#endif
#include <stddef.h>
#include <Memory.h>
struct Array
{
void **entries; /* An array of void pointers, to
* store any data */
size_t allocated; /* Elements allocated on the heap */
size_t size; /* Elements actually filled */
};
int
ArrayAdd(Array * array, void *value)
{
if (!array)
{
return 0;
}
return ArrayInsert(array, array->size, value);
}
Array *
ArrayCreate(void)
{
Array *array = Malloc(sizeof(Array));
if (!array)
{
return NULL;
}
array->size = 0;
array->allocated = ARRAY_BLOCK;
array->entries = Malloc(sizeof(void *) * ARRAY_BLOCK);
if (!array->entries)
{
Free(array);
return NULL;
}
return array;
}
void *
ArrayDelete(Array * array, size_t index)
{
size_t i;
void *element;
if (!array || array->size <= index)
{
return NULL;
}
element = array->entries[index];
for (i = index; i < array->size - 1; i++)
{
array->entries[i] = array->entries[i + 1];
}
array->size--;
return element;
}
void
ArrayFree(Array * array)
{
if (array)
{
Free(array->entries);
Free(array);
}
}
void *
ArrayGet(Array * array, size_t index)
{
if (!array)
{
return NULL;
}
if (index >= array->size)
{
return NULL;
}
return array->entries[index];
}
extern int
ArrayInsert(Array * array, size_t index, void *value)
{
size_t i;
if (!array || !value || index > array->size)
{
return 0;
}
if (array->size >= array->allocated)
{
void **tmp;
size_t newSize = array->allocated + ARRAY_BLOCK;
tmp = array->entries;
array->entries = Realloc(array->entries,
sizeof(void *) * newSize);
if (!array->entries)
{
array->entries = tmp;
return 0;
}
array->allocated = newSize;
}
for (i = array->size; i > index; i--)
{
array->entries[i] = array->entries[i - 1];
}
array->size++;
array->entries[index] = value;
return 1;
}
extern void *
ArraySet(Array * array, size_t index, void *value)
{
void *oldValue;
if (!value)
{
return ArrayDelete(array, index);
}
if (!array)
{
return NULL;
}
if (index >= array->size)
{
return NULL;
}
oldValue = array->entries[index];
array->entries[index] = value;
return oldValue;
}
size_t
ArraySize(Array * array)
{
if (!array)
{
return 0;
}
return array->size;
}
int
ArrayTrim(Array * array)
{
void **tmp;
if (!array)
{
return 0;
}
tmp = array->entries;
array->entries = Realloc(array->entries,
sizeof(void *) * array->size);
if (!array->entries)
{
array->entries = tmp;
return 0;
}
return 1;
}
static void
ArraySwap(Array * array, size_t i, size_t j)
{
void *p = array->entries[i];
array->entries[i] = array->entries[j];
array->entries[j] = p;
}
static size_t
ArrayPartition(Array * array, size_t low, size_t high, int (*compare) (void *, void *))
{
void *pivot = array->entries[high];
size_t i = low - 1;
size_t j;
for (j = low; j <= high - 1; j++)
{
if (compare(array->entries[j], pivot) < 0)
{
i++;
ArraySwap(array, i, j);
}
}
ArraySwap(array, i + 1, high);
return i + 1;
}
static void
ArrayQuickSort(Array * array, size_t low, size_t high, int (*compare) (void *, void *))
{
if (low < high)
{
size_t pi = ArrayPartition(array, low, high, compare);
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ArrayQuickSort(array, low, pi ? pi - 1 : 0, compare);
ArrayQuickSort(array, pi + 1, high, compare);
}
}
void
ArraySort(Array * array, int (*compare) (void *, void *))
{
if (!array)
{
return;
}
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ArrayQuickSort(array, 0, array->size - 1, compare);
}
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Array *
ArrayUnique(Array * array, int (*compare) (void *, void *))
{
Array *ret;
size_t i;
if (!array)
{
return NULL;
}
ret = ArrayDuplicate(array);
if (!ret)
{
return NULL;
}
if (ArraySize(ret) == 1)
{
/* There can't be any duplicates when there's only 1 value */
return ret;
}
ArraySort(ret, compare);
for (i = 1; i < ArraySize(ret); i++)
{
void *cur = ret->entries[i];
void *prev = ret->entries[i - 1];
if (compare(cur, prev) == 0)
{
/* Remove the duplicate, and put i back where it was. */
ArrayDelete(ret, i--);
}
}
ArrayTrim(ret);
return ret;
}
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/* Even though the following operations could be done using only the
* public Array API defined above, I opted for low-level struct
* manipulation because it allows much more efficient copying; we only
* allocate what we for sure need upfront, and don't have to
* re-allocate during the operation. */
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Array *
ArrayReverse(Array * array)
{
Array *ret;
size_t i;
size_t size;
if (!array)
{
return NULL;
}
if (!array->size)
{
return ArrayCreate();
}
ret = Malloc(sizeof(Array));
size = array->size;
ret->size = size;
ret->allocated = size;
ret->entries = Malloc(sizeof(void *) * size);
if (!ret->entries)
{
Free(ret);
return NULL;
}
for (i = 0; i < size; i++)
{
ret->entries[i] = array->entries[size - i - 1];
}
return ret;
}
Array *
ArrayFromVarArgs(size_t n, va_list ap)
{
size_t i;
Array *arr = Malloc(sizeof(Array));
if (!arr)
{
return NULL;
}
arr->size = n;
arr->allocated = n;
arr->entries = Malloc(sizeof(void *) * arr->allocated);
if (!arr->entries)
{
Free(arr);
return NULL;
}
for (i = 0; i < n; i++)
{
arr->entries[i] = va_arg(ap, void *);
}
return arr;
}
Array *
ArrayDuplicate(Array * arr)
{
size_t i;
Array *arr2 = Malloc(sizeof(Array));
if (!arr2)
{
return NULL;
}
arr2->size = arr->size;
arr2->allocated = arr->size;
arr2->entries = Malloc(sizeof(void *) * arr->allocated);
if (!arr2->entries)
{
Free(arr2);
return NULL;
}
for (i = 0; i < arr2->size; i++)
{
arr2->entries[i] = arr->entries[i];
}
return arr2;
}