first commit of v2 ft_printf

42-libft/ft_substr.c

@@ -0,0 +1,39 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_substr.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/06 13:20:55 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/12 13:51:23 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+char	*ft_substr(char const *s, unsigned int start, size_t len)
+{
+	size_t	i;
+	char	*sub_str;
+	size_t	s_len;
+
+	if (!s)
+		return (NULL);
+	s_len = ft_strlen(s);
+	if (start > s_len)
+		len = 0;
+	else if (s_len < (start + len))
+		len = s_len - start;
+	sub_str = malloc(sizeof(char) * (len + 1));
+	if (!sub_str)
+		return (NULL);
+	i = 0;
+	while (i < len)
+	{
+		sub_str[i] = s[start + i];
+		i++;
+	}
+	sub_str[i] = '\0';
+	return (sub_str);
+}