/*
 * Program to count alphabet characters in input file and produce output
 * file listing each letter found and how many times it was found.
 *
 * Program uses "tolower" to convert input characters to lower case and
 * only counts those for which the islower(result) is true.
 *
 * Program also prints to stdout the total number of characters in the 
 * input file and how many were counted.
 *
 * Names of input and output files are given as command-line arguments.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "alphacounters.h"

int main(int argc, char * argv[]) {

	if (argc < 3) {
		printf("usage %s infile outfile\n", argv[0]);
		return 1;
	}
	FILE * infile = fopen(argv[1], "r");
	if (infile == NULL) {
		printf("could not open %s\n", argv[1]);
		return 1;
	}

	int num_counters;
	letter_count_t * counters = build_alphacounters(&num_counters);
	if (counters == NULL) {
		printf("could not get space for %d counters\n", num_counters);
		return 1;
	}
	print_alphabet(stdout, counters, num_counters);

	/* 
	 * FIXME your code goes here
	 *
	 * outline:
	 *
	 * process infile a character at a time, incrementing counters
	 *   using update_counter() function
	 * close infile
	 * open output file, write nonzero counters to it, and close it
	 * print counts of alphabetic and all characters
	 */

	free(counters);
	return 0;
}