libft/ft_substr.c at main · rubenoid/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        ::::::::            */
/*   ft_substr.c                                        :+:    :+:            */
/*                                                     +:+                    */
/*   By: rvan-sch <rvan-sch@student.codam.nl>         +#+                     */
/*                                                   +#+                      */
/*   Created: 2019/11/22 20:51:51 by rvan-sch      #+#    #+#                 */
/*   Updated: 2019/11/22 20:52:27 by rvan-sch      ########   odam.nl         */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

	if (s == 0)
		return (0);
	if (ft_strlen(s) < start)
		return (ft_strdup(""));
	if (ft_strlen(s) < start + len)
		sub = (char *)malloc((ft_strlen(s) - start) * sizeof(char) + 1);
	else
		sub = (char *)malloc(len * sizeof(char) + 1);
	if (!sub)
		return (NULL);
	i = 0;
	while (i < len && s[start])
	{
		sub[i] = s[start];
		i++;
		start++;
	}
	sub[i] = '\0';
	return (sub);
}