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ft_memcmp.c
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ft_memcmp.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_memcmp.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dalves-p <dalves-p@student.42sp.org.br> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2021/05/27 16:15:29 by dalves-p #+# #+# */
/* Updated: 2022/05/26 19:07:05 by dalves-p ### ########.fr */
/* */
/* ************************************************************************** */
#include "libft.h"
/*
** LIBRARY: <strings.h>
** DESCRIPTION:
** The memcmp() function compares the first n bytes (interpreted as
** unsigned char) of the memory areas s1 and s2.
** It returns an integer less than, equal to, or greater than zero if the
** first n bytes of s1 is found, respectively, to be less than, to match, or be
** greater than the first n bytes of s2.
** For a nonzero return value, the sign is determined by the sign of the
** difference between the first pair of bytes (interpreted as unsigned char)
** that differ in s1 and s2.
*/
int ft_memcmp(const void *s1, const void *s2, size_t n)
{
size_t i;
i = 0;
if (!s1 && !s2)
return (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);
}