add lltoa

ft_lltoa.c

@@ -0,0 +1,62 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_lltoa.c                                         :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/07 13:06:35 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/12/07 12:29:25 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+static size_t	count_digits(long long n)
+{
+	size_t	size;
+
+	size = 0;
+	if (n <= 0)
+		size++;
+	while (n)
+	{
+		n /= 10;
+		size++;
+	}
+	return (size);
+}
+
+static void	insert_char(char *str, unsigned long long nbr, size_t index)
+{
+	while (nbr)
+	{
+		str[index--] = nbr % 10 + '0';
+		nbr /= 10;
+	}
+}
+
+char	*ft_lltoa(long long n)
+{
+	unsigned long long	nbr;
+	char			*str;
+	size_t			size;
+
+	nbr = n;
+	if (n < 0)
+		nbr = n * -1;
+	size = count_digits(n);
+	str = malloc(sizeof(char) * (size + 1));
+	if (!str)
+		return (NULL);
+	str[size] = '\0';
+	if (nbr == 0)
+		str[0] = '0';
+	else
+	{
+		if (n < 0)
+			str[0] = '-';
+		insert_char(str, nbr, size - 1);
+	}
+	return (str);
+}

libft.h

@@ -6,7 +6,7 @@
 /*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/11/05 09:49:43 by dgaillet          #+#    #+#             */
-/*   Updated: 2025/11/12 17:05:00 by dgaillet         ###   ########lyon.fr   */
+/*   Updated: 2025/12/07 12:29:43 by dgaillet         ###   ########lyon.fr   */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -67,5 +67,6 @@ void	ft_lstdelone(t_list *lst, void (*del)(void *));
 void	ft_lstclear(t_list **lst, void (*del)(void *));
 void	ft_lstiter(t_list *lst, void (*f)(void *));
 t_list	*ft_lstmap(t_list *lst, void *(*f)(void *), void (*del)(void *));
+char	*ft_lltoa(long long n);
 
 #endif