skeletton untested project

libft/ft_itoa.c

@@ -0,0 +1,83 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_itoa.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: thrieg <thrieg@student.42mulhouse.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/15 15:29:15 by thrieg            #+#    #+#             */
+/*   Updated: 2025/02/16 19:03:49 by thrieg           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+static void	ft_swap(char *a, char *b)
+{
+	char	c;
+
+	c = *a;
+	*a = *b;
+	*b = c;
+}
+
+static void	ft_reverse_buff(char buff[11], size_t(len))
+{
+	size_t	index;
+
+	if (buff[0] == '-')
+	{
+		index = 1;
+		while ((len / 2) >= index)
+		{
+			ft_swap(&buff[index], &buff[len - index]);
+			index++;
+		}
+	}
+	else
+	{
+		index = 0;
+		while (((len - 1) / 2) >= index)
+		{
+			ft_swap(&buff[index], &buff[len - index - 1]);
+			index++;
+		}
+	}
+}
+
+static char	*subfunction(char *ret, char buff[11], size_t buff_len)
+{
+	ft_reverse_buff(buff, buff_len);
+	ft_memcpy(ret, (const void *)buff, buff_len);
+	ret[buff_len] = '\0';
+	return (ret);
+}
+
+//only works if an int is 32 bits, I'll maybe change it later for the bonuses
+char	*ft_itoa(int n)
+{
+	char	*ret;
+	char	buff[11];
+	size_t	buff_len;
+
+	if (n <= -2147483648)
+		return (ft_strdup("-2147483648"));
+	if (n == 0)
+		return (ft_strdup("0"));
+	buff_len = 0;
+	if (n < 0)
+	{
+		buff[0] = '-';
+		buff_len++;
+		n *= -1;
+	}
+	while (n > 0)
+	{
+		buff[buff_len++] = (n % 10) + '0';
+		n /= 10;
+	}
+	ret = malloc(sizeof(char) * (buff_len) + 1);
+	if (!ret)
+		return (NULL);
+	return (subfunction(ret, buff, buff_len));
+}