ft_strtrim.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tspoof <tspoof@student.hive.fi>            +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/11/05 14:05:22 by tspoof            #+#    #+#             */
/*   Updated: 2022/11/09 18:58:39 by tspoof           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "libft.h"
 
char    *ft_strtrim(char const *s1, char const *set)
{
    char    *ptr;
    size_t  start_idx;
    size_t  end_idx;
 
    if (!s1 || !set)
        return (NULL);
    start_idx = 0;
    end_idx = ft_strlen(s1);
    while (ft_strchr(set, s1[start_idx]) && start_idx < end_idx)
        start_idx++;
    while (ft_strchr(set, s1[end_idx]) && start_idx < end_idx)
        end_idx--;
    ptr = ft_substr(s1 + start_idx, 0, end_idx - start_idx + 1);
    if (!ptr)
        return (NULL);
    return (ptr);
}