Mandatory finished

libft/ft_strtrim.c

@@ -0,0 +1,87 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_strtrim.c                                       :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/06 16:31:38 by dgaillet          #+#    #+#             */
+/*   Updated: 2025/11/12 13:50:53 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+static int	test_charset(char c, char const *set)
+{
+	if (!set[0])
+		return (0);
+	if (c == set[0])
+		return (1);
+	return (test_charset(c, set + 1));
+}
+
+static size_t	end_trim(char const *s1, char const *set)
+{
+	int	i;
+
+	i = 0;
+	if (!s1[0])
+		return (0);
+	while (s1[i])
+		i++;
+	i--;
+	while (test_charset(s1[i], set))
+		i--;
+	return (i);
+}
+
+static size_t	start_trim(char const *s1, char const *set)
+{
+	size_t	i;
+
+	i = 0;
+	while (test_charset(s1[i], set))
+		i++;
+	return (i);
+}
+
+static int	is_empty(char const *s1, char const *set)
+{
+	size_t	i;
+
+	i = 0;
+	while (s1[i])
+	{
+		if (!test_charset(s1[i], set))
+			return (0);
+		i++;
+	}
+	return (1);
+}
+
+char	*ft_strtrim(char const *s1, char const *set)
+{
+	size_t	start;
+	size_t	end;
+	size_t	i;
+	char	*str;
+
+	if (!s1 || !set)
+		return (NULL);
+	i = 0;
+	if (is_empty(s1, set))
+		return (ft_calloc(1, sizeof(char)));
+	start = start_trim(s1, set);
+	end = end_trim(s1, set);
+	str = malloc(sizeof(char) * (end - start + 2));
+	if (!str)
+		return (NULL);
+	while (start + i <= end)
+	{
+		str[i] = s1[i + start];
+		i++;
+	}
+	str[i] = '\0';
+	return (str);
+}