libbackup/ft_memcmp.c at master · Wouterbeets/libbackup · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   ft_memcmp.c                                        :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: wbeets <wbeets@student.42.fr>              +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2015/03/20 11:56:55 by wbeets            #+#    #+#             */
/*   Updated: 2015/03/20 11:56:55 by wbeets           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_memcmp(const void *s1, const void *s2, size_t n)
{
	unsigned char	*ptr1;
	unsigned char	*ptr2;
	int				i;

	if (!s1 && !s2 && !n)
		return (0);
	i = 0;
	ptr1 = (unsigned char *)s1;
	ptr2 = (unsigned char *)s2;
	while (n--)
	{
		if (ptr1[i] != ptr2[i])
			return (ptr1[i] - ptr2[i]);
		i++;
	}
	return (0);
}