/*
 * implementations of functions in alphacounters.h
 */
#include "alphacounters.h"

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

letter_count_t * build_alphacounters(int *sz) {
	/* first count how many characters meet criterion for inclusion */
	int count = 0;
	for (int c = SCHAR_MIN; c <= SCHAR_MAX; ++c) {
		if (islower(c)) {
			++count;
		}
	}
	*sz = count;

	/* now allocate space and build array */
	letter_count_t * counters = malloc(sizeof(counters[0]) * count);
	if (counters != NULL) {
		count = 0;
		for (int c = SCHAR_MIN; c <= SCHAR_MAX; ++c) {
			if (islower(c)) {
				counters[count] = (letter_count_t) { c, 0 };
				++count;
			}
		}
	}

	return counters;
}

void print_alphabet(FILE * f, letter_count_t counters[], int num_counters) {
	fputs("alphabet '", f);
	for (int i = 0; i < num_counters; ++i) {
		fputc(counters[i].letter, f);
	}
	fputs("'\n", f);
}

bool update_counter(char ch, int incr,
		letter_count_t counters[], int num_counters) 
{
	/* FIXME your code goes here */
	return false; /* FIXME temporary so compiler doesn't complain */
}