Add hexadecimal support w/ ft_itoa_base

libftprintf/ft_itoa_base.c

@@ -0,0 +1,79 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_itoa_base.c                                     :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: gbaconni <gbaconni@42lausanne.ch>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2021/08/16 13:51:16 by gbaconni          #+#    #+#             */
+/*   Updated: 2022/04/15 00:08:27 by gbaconni         ###   lausanne.ch       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libftprintf.h"
+
+static int	ft_intlen_base(int n, int nbase);
+static char	*ft_strrev(char *s);
+
+char	*ft_itoa_base(int n, char *base)
+{
+	char	*s;
+	int		i;
+	long	nbr;
+	long	nbase;
+
+	nbase = ft_strlen(base);
+	s = (char *) ft_calloc((ft_intlen_base(n, nbase) + 1), sizeof(char));
+	if (s == NULL)
+		return (NULL);
+	i = 0;
+	nbr = n;
+	if (nbr == 0)
+		s[i++] = '0';
+	if (nbr < 0)
+		nbr = -nbr;
+	while (nbr > 0)
+	{
+		s[i++] = base[nbr % nbase];
+		nbr /= nbase;
+	}
+	if (n < 0)
+		s[i++] = '-';
+	s[i] = '\0';
+	return (ft_strrev(s));
+}
+
+static int	ft_intlen_base(int n, int nbase)
+{
+	size_t	len;
+
+	len = 0;
+	if (n < 0 || n == 0)
+		len++;
+	while (!(n < 1 && n > -1))
+	{
+		n /= nbase;
+		len++;
+	}
+	return (len);
+}
+
+static char	*ft_strrev(char *s)
+{
+	int		len;
+	int		i;
+	int		j;
+	char	c;
+
+	len = ft_strlen(s);
+	i = 0;
+	while (i < (len / 2))
+	{
+		j = len - 1 - i;
+		c = s[i];
+		s[i] = s[j];
+		s[j] = c;
+		i++;
+	}
+	return (s);
+}