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dyn_arr.h
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dyn_arr.h
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// dyn_arr.h
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
typedef struct {
int *arr;
size_t size;
size_t capacity;
} DynamicArray;
int initDynamicArray(DynamicArray *pDynArr, size_t initCapacity);
int appendToDynArr(DynamicArray *pDynArr, int item);
int removeFromDynArr(DynamicArray *pDa, int rm_pos);
DynamicArray *reallocDynArr(DynamicArray *pDynArr, int mode);
DynamicArray *reallocateDynArrToIncreaseCapacity(DynamicArray *pDynArr);
DynamicArray *reallocateDynArrToDecreaseCapacity(DynamicArray *pDynArr);
int freeDynArr(DynamicArray *pDynArr);
size_t getSizeOfDynArr(DynamicArray *pDynArr);
void setSizeOfDynArr(DynamicArray *pDynArr, size_t newSize);
size_t getCapacityOfDynArr(DynamicArray *pDynArr);
void setCapacityOfDynArr(DynamicArray *pDynArr, size_t newCapacity);
int *getDynArr(DynamicArray *pDynArr);
int internalHandleError(const char *errMsg);
void printDynArrStatus(DynamicArray *pDynArr);
/**
* Initializes a dynamic array with the given initial capacity.
*
* @param pDynArr a pointer to the DynamicArray struct
* @param initCapacity the initial capacity of the dynamic array
*
* @return 0 on success
*
* @throws ErrorType if an error occurs while trying to allocate memory
*/
int initDynamicArray(DynamicArray *pDynArr, size_t initCapacity)
{
pDynArr->arr = (int*)malloc(sizeof(int) * initCapacity);
if (!getDynArr(pDynArr))
return internalHandleError("Error occurred while trying to allocate memory.\n");
pDynArr->size = 0;
pDynArr->capacity = initCapacity;
return 0;
}
/**
* Appends an item to the given DynamicArray.
*
* @param pDynArr a pointer to the DynamicArray structure to append the item to
* @param item the item to be appended to the DynamicArray
*
* @return 0 indicating successful append
*
* @throws ErrorType if there is an error during the append operation
*/
int appendToDynArr(DynamicArray *pDynArr, int item)
{
int currentSize = getSizeOfDynArr(pDynArr);
if (currentSize + 1 >= getCapacityOfDynArr(pDynArr))
{
pDynArr = reallocateDynArrToIncreaseCapacity(pDynArr);
}
pDynArr->arr[pDynArr->size] = item;
int newSize = currentSize + 1;
setSizeOfDynArr(pDynArr, newSize);
return 0;
}
/**
* Removes an element from the given DynamicArray at the specified position.
*
* @param pDynArr pointer to the DynamicArray
* @param rm_pos the position of the element to be removed
*
* @return -1 if an error occurs, otherwise no return value
*
* @throws None
*/
int removeFromDynArr(DynamicArray *pDynArr, int rm_pos)
{
int currentSize = getSizeOfDynArr(pDynArr);
int currentCapacity = getCapacityOfDynArr(pDynArr);
if (rm_pos > currentSize || rm_pos < 0)
{
printf("Out of bound, no element to remove at position %d", rm_pos);
return -1;
}
for (size_t i = rm_pos + 1; i < currentSize; i++)
{
pDynArr->arr[i-1] = pDynArr->arr[i];
}
setSizeOfDynArr(pDynArr, currentSize - 1);
reallocateDynArrToDecreaseCapacity(pDynArr);
}
/**
* Frees the memory of the previously allocated dynamic array.
*
* @param pDynArr pointer to the DynamicArray
*
* @return 0 if the memory is freed successfully
*
* @throws None
*/
int freeDynArr(DynamicArray *pDynArr)
{
free(pDynArr->arr);
pDynArr = NULL;
return 0;
}
// Getters and Setters
size_t getSizeOfDynArr(DynamicArray *pDynArr)
{
return pDynArr->size;
}
void setSizeOfDynArr(DynamicArray *pDynArr, size_t newSize)
{
pDynArr->size = newSize;
}
size_t getCapacityOfDynArr(DynamicArray *pDynArr)
{
return pDynArr->capacity;
}
void setCapacityOfDynArr(DynamicArray *pDynArr, size_t newCapacity)
{
pDynArr->capacity = newCapacity;
}
int *getDynArr(DynamicArray *pDynArr)
{
return pDynArr->arr;
}
DynamicArray *reallocateDynArrToIncreaseCapacity(DynamicArray *pDynArr)
{
printf("Array capacity reached...\n");
printf("Reallocating array to increase capacity by x2\n");
int currentCapacity = getCapacityOfDynArr(pDynArr);
reallocDynArr(pDynArr, 1);
setCapacityOfDynArr(pDynArr, currentCapacity * 2);
printDynArrStatus(pDynArr);
return pDynArr;
}
DynamicArray *reallocateDynArrToDecreaseCapacity(DynamicArray *pDynArr)
{
printf("Reallocating array to decrease capacity minus 1\n");
int currentCapacity = getCapacityOfDynArr(pDynArr);
reallocDynArr(pDynArr, 0);
setCapacityOfDynArr(pDynArr, currentCapacity - 1);
printDynArrStatus(pDynArr);
return pDynArr;
}
DynamicArray *reallocDynArr(DynamicArray *pDynArr, int mode)
{
size_t newCapacity;
if (mode == 0) {
// Remove element mode TODO
newCapacity = getCapacityOfDynArr(pDynArr) - 1;
} else {
// Append element mode TODO
newCapacity = getCapacityOfDynArr(pDynArr) * 2;
}
pDynArr->arr = (int *)realloc(getDynArr(pDynArr), (newCapacity * sizeof(int)));
if (pDynArr->arr == NULL)
{
internalHandleError("Error occurred trying to re-allocate the array.");
return NULL;
}
return pDynArr;
}
void printDynArrStatus(DynamicArray *pDynArr)
{
printf("After re-allocation the new capacity is now: %ld elements\n", getCapacityOfDynArr(pDynArr));
printf("Total size of allocated memory is: %ld bytes\n", (sizeof(int) * getCapacityOfDynArr(pDynArr)));
printf("\n");
}
int internalHandleError(const char *errMsg)
{
fprintf(stderr, "%s", errMsg);
return 1;
}
// End of dyn_arr.h