1 files changed, 122 insertions, 0 deletions
diff --git a/ft_memcmp.c b/ft_memcmp.c
new file mode 100644
index 0000000..32f8eec
--- /dev/null
+++ b/ft_memcmp.c
@@ -0,0 +1,122 @@
+/*
+Libft Copyright (C) 2026 yctct
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "libft.h"
+
+int	ft_memcmp(const void *s1, const void *s2, size_t n)
+{
+	unsigned char	*cs1;
+	unsigned char	*cs2;
+	size_t			i;
+
+	cs1 = (unsigned char *)s1;
+	cs2 = (unsigned char *)s2;
+	i = 0;
+	if (n == 0)
+		return (0);
+	while (i < n - 1 && cs1[i] == cs2[i])
+		i++;
+	return (cs1[i] - cs2[i]);
+}
+
+/*
+#include <string.h>
+
+int	main(void)
+{
+	char	s[] = {-128, 0, 127, 0};
+	char	sCpy[] = {-128, 0, 127, 0};
+
+	printf("%i\n", ft_memcmp(s, sCpy, 4));
+	printf("%i\n", memcmp(s, sCpy, 4));
+	printf("%i\n", ft_memcmp("abcdefghij", "abcdefgxyz", 7));
+	printf("%i\n", memcmp("abcdefghij", "abcdefgxyz", 7));
+}
+int	ft_memcmp(const void *s1, const void *s2, size_t n)
+{
+	size_t			i;
+	unsigned char	*a;
+	unsigned char	*b;
+
+	i = 0;
+	a = (unsigned char *)s1;
+	b = (unsigned char *)s2;
+	if (s1 == s2 || n == 0)
+		return (0);
+	while (*a == *b && i < n - 1)
+	{
+		a++;
+		b++;
+		i++;
+	}
+	return (*a - *b);
+}
+*/
+/*
+int	main(void)
+{
+			char s[] = {-128, 0, 127, 0};
+			char sCpy[] = {-128, 0, 127, 0};
+			char s2[] = {0, 0, 127, 0};
+			char s3[] = {0, 0, 42, 0};
+
+	printf("\n");
+			printf("%i\n", ft_memcmp(s, sCpy, 4));
+			printf("%i\n", memcmp(s, sCpy, 4));
+	printf("\n");
+			printf("%i\n", ft_memcmp(s, s2, 0));
+			printf("%i\n", memcmp(s, s2, 0));
+	printf("\n");
+			printf("%i\n", ft_memcmp(s, s2, 1));
+			printf("%i\n", memcmp(s, s2, 1));
+	printf("\n");
+			printf("%i\n", ft_memcmp(s2, s, 1));
+			printf("%i\n", memcmp(s2, s, 1));
+	printf("\n");
+			printf("%i\n", ft_memcmp(s2, s3, 4));
+			printf("%i\n", memcmp(s2, s3, 4));
+	printf("\n");
+	printf("\n");
+	printf("%i\n", ft_memcmp("salut", "salut", 5));
+	printf("%i\n", memcmp("salut", "salut", 5));
+	printf("\n");
+	printf("%i\n", ft_memcmp("t\200", "t\0", 2));
+	printf("%i\n", memcmp("t\200", "t\0", 2));
+	printf("\n");
+	printf("%i\n", ft_memcmp("testss", "test", 5));
+	printf("%i\n", memcmp("testss", "test", 5));
+	printf("\n");
+	printf("%i\n", ft_memcmp("test", "tEst", 4));
+	printf("%i\n", memcmp("test", "tEst", 4));
+	printf("\n");
+	printf("%i\n", ft_memcmp("", "test", 4));
+	printf("%i\n", memcmp("", "test", 4));
+	printf("\n");
+	printf("%i\n", ft_memcmp("test", "", 4));
+	printf("%i\n", memcmp("test", "", 4));
+	printf("\n");
+	printf("%i\n", ft_memcmp("abcdefghij", "abcdefgxyz", 7));
+	printf("%i\n", memcmp("abcdefghij", "abcdefgxyz", 7));
+	printf("\n");
+	printf("%i\n", ft_memcmp("abcdefgh", "abcdwxyz", 6));
+	printf("%i\n", memcmp("abcdefgh", "abcdwxyz", 6));
+	printf("\n");
+	printf("%i\n", ft_memcmp("zyxbcdefgh", "abcdefgxyz", 0));
+	printf("%i\n", memcmp("zyxbcdefgh", "abcdefgxyz", 0));
+			return (0);
+}
+*/