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

// arbitrary buffer size for reading file input
#define BUFSIZE 1000

int find_array_maxes(int *input_array, int size){
    int max = 0;
    for(int i=0; i < size; i++){
        if(max < input_array[i]){
          max = input_array[i];
        }
    }
    return max;
}

int main(int argc, char *argv[]){
    // check to ensure there are sufficient command line arguments
    if(argc <= 2){
        printf("At least two arguments are required!\n");
        exit(1);
    }

    // allocates memory for array that will store file values
    int array_size = atoi(argv[1]);
    int *array_ptr = (int*) malloc(array_size * sizeof(int));

    // creates a file ptr and buffer to read file contents
    FILE *file = fopen(argv[2], "r");
    char buff[BUFSIZE];
    int converted_num;
    int counter = 0;

    // verify the array is allocated
    if(array_ptr == NULL){
        printf("Memory allocation of %d bytes has failed.\n", *array_ptr);
        fclose(file);
        exit(1);
    } else {
        // stores contents of file into the buffer and is converted from the buffer to int
        // to be stored in the dynamically allocated array
        while(fgets(buff, BUFSIZE-1, file) != NULL && counter < array_size){
            converted_num = atoi(buff);
            *array_ptr = converted_num;
            printf("%d\n", *array_ptr);
            array_ptr++;
            counter++;
        }
            fclose(file);
    }
    printf("The max number of the array is %d\n",find_array_maxes(array_ptr, array_size));
    return 0;
}