C utilities

intToBin.c

#include <stdlib.h>

char *intToBin(int num) {
	int bits = (num == 0);

	int cp = num;
	for (cp = num; cp > 0; cp >>= 1) bits++;

	char *result = (char *)malloc(bits * sizeof(char));

	for (cp = num; cp > 0; cp >>= 1) result[--bits] = (cp & 1) + '0';

	return result;
}

readLine.c

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

ssize_t readLine(char *str) {
	char *buffer = NULL;
	size_t bufferSize;
	ssize_t tam;

	if (-1 == (tam = getline(&buffer, &bufferSize, stdin))) {
		return tam;
	}

	strcpy(str, buffer);
	free(buffer);

	str[tam - 1] = '\0';
	return tam - 1;
}