ft_substr.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_substr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: adiaz-lo <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/01/13 10:35:25 by adiaz-lo          #+#    #+#             */
/*   Updated: 2020/01/13 10:49:30 by adiaz-lo         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

/*
** This function allocates (using 'malloc()') and returns a substring from the
** string 's'.
** The substring begins at index 'start' and is as maximum size 'len'.
*/

#include "libft.h"

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

	if (!s)
		return (NULL);
	if ((unsigned int)ft_strlen(s) < start)
		return (ft_strdup(""));
	size = ft_strlen(s + start);
	if (size < len)
		len = size;
	if (!(tab = (char *)malloc((len + 1) * sizeof(char))))
		return (NULL);
	count = 0;
	while (count < len)
	{
		tab[count] = s[start + count];
		count++;
	}
	tab[count] = '\0';
	return (tab);
}