#include <stdio.h>
#include <stdlib.h>

/*
 *
 * author:  John Nakamura  ITB 101  x27017  nakamura
 *
 */

#define BLOCKSIZE  12


void Show(int *array, int length);
int *Add_memory(int *array, int *size);
void Insert(int **arr, int *size, int *len, int targ);

int main(void)
{
	int *arr;
	int size=0;
	int len=0;

	arr = Add_memory(arr, &size);
	Show(arr,size);
	Insert(&arr,&size,&len,1);
	Show(arr,len);
	Insert(&arr,&size,&len,-1);
	Show(arr,len);
	Insert(&arr,&size,&len,0);
	Show(arr,len);
	Insert(&arr,&size,&len,1000);
	Show(arr,len);

	return 0;
}

void Show(int *array, int length)
{
	int i;

	if (array == NULL) {
		printf("Trying to print a NULL array");
		exit(3);
	}

	printf("[");
	for (i=0; i<length;++i) {
		printf("%d ",array[i]);
	}
	printf("]\n");
}



int *Add_memory(int *array, int *size)
{
	int *temp;

	if (array == NULL) {
		if (*size != 0) {
			printf("NULL array and non-zero size!");
			exit(2);
		}
		temp = (int *)malloc(BLOCKSIZE*sizeof(int));
	}
	else {
		temp = (int *)realloc(array,(*size+BLOCKSIZE)*sizeof(int));
	}

	if (temp == NULL) {
		printf("Out of memory\n");
		exit(1);
	}

	*size += BLOCKSIZE;

	return(temp);
}


void Insert(int **arr, int *size, int *len, int targ)
{
	if (arr==NULL) {
		printf("Insert called with no place to put in an array");
		exit(4);
	} else if (size==NULL) {
		printf("Insert called with array size = 0");
		exit(5);
	} else if  (len==NULL) {
		printf("Insert called with no place to store new length");
		exit(6);
	}

	if (*len >= *size) {
		*arr = Add_memory(*arr,size);
	}

	(*arr)[*len] = targ;
	*len += 1;
}