ft_strtrim.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kfujita <kfujita@student.42tokyo.jp>       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/04/18 05:00:01 by kfujita           #+#    #+#             */
/*   Updated: 2022/04/25 23:30:14 by kfujita          ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include <stddef.h>
#include "ft_string.h"
 
char    *ft_strtrim(char const *s1, char const *set)
{
    size_t      s1_len;
    const char  *s1_end;
 
    if (s1 == NULL)
        return (NULL);
    if (set == NULL || *s1 == '\0')
        return (ft_strdup(s1));
    s1_len = ft_strlen(s1);
    s1_end = s1 + s1_len - 1;
    while (*s1 != '\0' && ft_strchr(set, *s1) != NULL)
        s1++;
    if (*s1 == '\0')
        return (ft_strdup(""));
    while (ft_strchr(set, *s1_end) != NULL)
        s1_end--;
    return (ft_strndup(s1, (size_t)s1_end - (size_t)s1 + 1));
}