libft/ft_substr.c at master · sshresthh/libft · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_substr.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: sshresth <sshresth@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/03/11 13:58:49 by sshresth          #+#    #+#             */
/*   Updated: 2024/03/22 12:51:41 by sshresth         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

static char	*ft_strnew(size_t n)
{
	char	*str;

	str = (char *)malloc(sizeof(char) * (n + 1));
	if (!str)
		return (NULL);
	return (str);
}

char	*ft_substr(char const *s, unsigned int start, size_t len)
{
	char	*str;
	char	*sptr;

	if (!s)
		return (NULL);
	if (start > ft_strlen(s))
		len = 0;
	else if (len > (ft_strlen(s) - start))
		len = ft_strlen(s) - start;
	str = ft_strnew(len);
	if (!str)
		return (NULL);
	s += start;
	sptr = str;
	*(str + len) = '\0';
	while (len-- && *s)
		*str++ = *s++;
	return (sptr);
}