42_libft/ft_substr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_substr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/09/28 18:53:44 by cchauvet          #+#    #+#             */
/*   Updated: 2022/10/05 20:53:19 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_substr(char const *s, unsigned int start, size_t len)
{
	ssize_t	size;
	char	*ptr;

	if (s == NULL)
		return (NULL);
	size = ft_strlen(s);
	size -= start;
	if (size < 0)
		size = 0;
	if ((size_t)size > len)
		size = len;
	ptr = malloc((size + 1) * sizeof(char));
	if (ptr == NULL)
		return (NULL);
	ptr[size] = '\0';
	while (size-- > 0)
		ptr[size] = s[start + size];
	return (ptr);
}