ft_memcmp.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   memcmp.c                                           :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: dramos-h <dramos-h@student.42urduli>       +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/12/01 09:13:41 by dramos-h          #+#    #+#             */
/*   Updated: 2022/12/01 09:13:44 by dramos-h         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "libft.h"

int	ft_memcmp(const void *s1, const void *s2, size_t n)
{
	size_t	i;

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

/* int main ()
{
    const char *s1 = "abcdefg";
    const char *s2 = "abcdefg";
    printf("%d\n", ft_memcmp(s1, s2, 9));
	
} */

/* DESCRIPTION
     The memcmp() function compares byte string s1 against byte string s2.
     Both strings are assumed to be n bytes long.

RETURN VALUES
     The memcmp() function returns zero if the two strings are identical, oth-
     erwise returns the difference between the first two differing bytes
     (treated as unsigned char values, so that `\200' is greater than `\0',
     for example).  Zero-length strings are always identical.  This behavior
:...skipping... */