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ft_memcmp.c
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ft_memcmp.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* ft_memcmp.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: akyoshid <akyoshid@student.42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/11/18 11:28:00 by akyoshid #+# #+# */
/* Updated: 2023/11/18 13:12:53 by akyoshid ### ########.fr */
/* */
/* ************************************************************************** */
// === DESCRIPTION ===
// Compare byte string s1 against byte string s2.
// Both strings are assumed to be n bytes long.
// === RETURN VALUES ===
// Return s1 - s2.
// If s1 and s2 are identical, return 0.
// Use unsigned characters for comparison, so that ‘\200’ is greater than ‘\0’.
// This behavior is not required by C
// and portable code should only depend on the sign of the returned value.
#include "libft.h"
int ft_memcmp(const void *s1, const void *s2, size_t n)
{
const unsigned char *p1;
const unsigned char *p2;
size_t i;
p1 = (const unsigned char *)s1;
p2 = (const unsigned char *)s2;
i = 0;
while (i < n)
{
if (p1[i] != p2[i])
return (p1[i] - p2[i]);
i++;
}
return (0);
}
// int main(void)
// {
// char str1[8] = "abcdefg\200";
// char str2[8] = "abcdefg";
// printf("%d\n", ft_memcmp(str1, str2, 8));
// printf("%d\n", memcmp(str1, str2, 8));
// return (0);
// }