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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strtrim.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: hyojeong <hyojeong@student.42seoul.kr>     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/03/10 13:57:12 by hyojeong          #+#    #+#             */
/*   Updated: 2022/03/19 19:14:22 by hyojeong         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include <stdlib.h>
#include "libft.h"

char	*ft_strtrim(char const *s1, char const *set)
{
	size_t		start;
	size_t		end;
	size_t		len;
	char		*str;

	if (set == 0)
		return (ft_strdup(s1));
	start = 0;
	len = ft_strlen(s1);
	end = len;
	while (s1[start] && ft_strchr(set, s1[start]))
		start++;
	while (s1[end - 1] && ft_strchr(set, s1[end - 1]))
	{
		if (end - 1 < 1)
			break ;
		end--;
	}
	if (start > end)
		return (ft_strdup(""));
	str = (char *)malloc(sizeof(char) * (end - start + 1));
	if (str == 0)
		return (0);
	ft_strlcpy(str, s1 + start, end - start + 1);
	return (str);
}