ft_substr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_substr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: apuchill <apuchill@student.42sp.org.br>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/01/27 21:24:14 by apuchill          #+#    #+#             */
/*   Updated: 2020/02/19 14:06:58 by apuchill         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

/*
** LIBRARY: N/A
** SYNOPSIS: extract substring from string
**
** DESCRIPTION:
** 		Allocates (with malloc(3)) and returns a substring from the string ’s’.
**	The substring begins at index ’start’ and is of maximum size ’len’.
*/

#include "libft.h"

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

	if (!s || !(new_str = (char *)malloc(len + 1)))
		return (0);
	i = start;
	j = 0;
	while (i < ft_strlen(s) && j < len)
		new_str[j++] = s[i++];
	new_str[j] = '\0';
	return (new_str);
}