Added ft_itoa_base

1 files changed, 56 insertions, 0 deletions

diff --git a/ft_itoa_base.c b/ft_itoa_base.c
new file mode 100644
index 0000000..9f65422
--- /dev/null
+++ b/ft_itoa_base.c
@@ -0,0 +1,56 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_itoa_base.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: cacharle <marvin@42.fr>                    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2019/10/25 04:00:58 by cacharle          #+#    #+#             */
+/*   Updated: 2019/10/25 04:07:42 by cacharle         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+static int	nbrlen_radix(long int nbr, int radix)
+{
+	int					counter;
+	long unsigned int	u_nbr;
+
+	if (nbr == 0)
+		return (1);
+	counter = 0;
+	u_nbr = nbr;
+	if (nbr < 0)
+	{
+		counter++;
+		u_nbr = -nbr;
+	}
+	while (u_nbr > 0)
+	{
+		u_nbr /= radix;
+		counter++;
+	}
+	return (counter);
+}
+
+char		*ft_itoa_base(long int n, char *base)
+{
+	char				*str;
+	int					len;
+	int					radix;
+	long unsigned int	u_nbr;
+
+	radix = ft_strlen(base);
+	len = nbrlen_radix(n, radix);
+	if ((str = (char*)malloc(sizeof(char) * (len + 1))) == NULL)
+		return (NULL);
+	str[len] = '\0';
+	u_nbr = n < 0 ? -n : n;
+	if (n < 0)
+		str[0] = '-';
+	while (--len >= (n < 0 ? 1 : 0))
+	{
+		str[len] = base[u_nbr % radix];
+		u_nbr /= radix;
+	}
+	return (str);
+}