libft/ft_strtrim.c at main · metaskinn/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: metaskin <metaskin@student.42istanbul.c    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2026/01/04 21:07:12 by metaskin          #+#    #+#             */
/*   Updated: 2026/01/19 14:57:10 by metaskin         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_strtrim(char const *s1, char const *set)
{
	size_t	start;
	size_t	end;
	size_t	trim_len;
	char	*trimmed;

	if (!s1 || !set)
		return (NULL);
	start = 0;
	while (s1[start] && ft_strchr(set, s1[start]))
		start++;
	end = ft_strlen(s1);
	while (end > start && ft_strchr(set, s1[end - 1]))
		end--;
	trim_len = end - start;
	trimmed = (char *)malloc(trim_len + 1);
	if (!trimmed)
		return (NULL);
	ft_memcpy(trimmed, s1 + start, trim_len);
	trimmed[trim_len] = '\0';
	return (trimmed);
}