Libft/ft_substr.c at main · ghamry03/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
/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_substr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: ommohame < ommohame@student.42abudhabi.ae> +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2021/12/28 00:46:59 by ommohame          #+#    #+#             */
/*   Updated: 2022/01/13 00:03:52 by ommohame         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

/*
* creates a sub string
* starts from s + start
* copies len times
*/
char	*ft_substr(char const *s, unsigned int start, size_t len)
{
	size_t	s_len;
	char	*sub;

	if (!s)
		return (NULL);
	s_len = ft_strlen(s);
	if (start > s_len)
		return (ft_strdup(""));
	if (len > s_len - start)
		len = s_len - start;
	sub = (char *)malloc(sizeof(char) * (len + 1));
	if (!sub)
		return (NULL);
	ft_strlcpy(sub, s + start, len + 1);
	return (sub);
}