ft_strncmp.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_strncmp.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: apuchill <apuchill@student.42sp.org.br>    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2019/12/02 22:59:36 by apuchill          #+#    #+#             */
/*   Updated: 2020/02/19 15:11:04 by apuchill         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

/*
** LIBRARY: <string.h>
** SYNOPSIS: compare strings (size-bounded)
**
** DESCRIPTION:
** 		The strcmp() and strncmp() functions lexicographically compare the null-
**	terminated strings s1 and s2.
** 		The strncmp() function compares not more than n characters.  Because
**	strncmp() is designed for comparing strings rather than binary data,
**	characters that appear after a `\0' character are not compared.
*/

#include "libft.h"

int		ft_strncmp(const char *s1, const char *s2, size_t n)
{
	size_t	i;

	if (n == 0)
		return (0);
	i = 0;
	while (s1[i] == s2[i] && s1[i] != '\0')
	{
		if (i < (n - 1))
			i++;
		else
			return (0);
	}
	return ((unsigned char)(s1[i]) - (unsigned char)(s2[i]));
}