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

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/* ************************************************************************** */
/*                                                                            */
/*                                                        ::::::::            */
/*   ft_substr.c                                        :+:    :+:            */
/*                                                     +:+                    */
/*   By: nsterk <marvin@codam.nl>                     +#+                     */
/*                                                   +#+                      */
/*   Created: 2020/09/24 21:24:38 by nsterk        #+#    #+#                 */
/*   Updated: 2021/03/03 01:45:55 by nsterk        ########   odam.nl         */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

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

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