ft_substr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_substr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: mdahlstr <mdahlstr@student.hive.fi>        +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/04/24 16:03:54 by mdahlstr          #+#    #+#             */
/*   Updated: 2024/04/30 14:07:04 by mdahlstr         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

char	*ft_substr(char const *s, unsigned int start, size_t len)
{
	char			*substr;
	size_t			i;
	unsigned int	s_len;

	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;
	substr = malloc(sizeof(char) * (len + 1));
	if (!substr)
		return (0);
	i = 0;
	while (i < len)
	{
		substr[i] = s[start + i];
		i++;
	}
	substr[i] = '\0';
	return (substr);
}
/* Allocates (with malloc(3)) and returns a substring
from the string ’s’. The substring begins at index
’start’ and is of maximum size ’len’. 

Return value:
The substring.
NULL if the allocation fails. */