1 files changed, 73 insertions, 0 deletions
diff --git a/ft_strncmp.c b/ft_strncmp.c
new file mode 100644
index 0000000..d4858dc
--- /dev/null
+++ b/ft_strncmp.c
@@ -0,0 +1,73 @@
+/*
+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_strncmp(const char *s1, const char *s2, size_t n)
+{
+	size_t	i;
+
+	i = 0;
+	while (i < n)
+	{
+		if ((s1[i] != s2[i]) || s1[i] == '\0')
+			return ((unsigned char)s1[i] - (unsigned char)s2[i]);
+		i++;
+	}
+	return (0);
+}
+/*
+#include <stdio.h>
+#include <string.h>
+
+int	main(void)
+{
+	char	str1[] = "ABC";
+	char	str2[] = "ABC";
+	char	str3[] = "AB";
+	char	str4[] = "ABA";
+	char	str5[] = "ABZ";
+	char	str6[] = "ABJ";
+	int		size;
+
+	printf("############ strncmp ############\n");
+	size = 3;
+	printf("%d\n", ft_strncmp(str1, str2, size));
+	printf("%d\n", strncmp(str1, str2, size));
+	size = 0;
+	printf("%d\n", ft_strncmp(str1, str1, size));
+	printf("%d\n", strncmp(str1, str1, size));
+	size = -1;
+	printf("%d\n", ft_strncmp(str1, str1, size));
+	printf("%d\n", strncmp(str1, str1, size));
+	size = 3;
+	printf("%d\n", ft_strncmp(str1, str3, size));
+	printf("%d\n", strncmp(str1, str3, size));
+	size = 3;
+	printf("%d\n", ft_strncmp(str4, str5, size));
+	printf("%d\n", strncmp(str4, str5, size));
+	size = 3;
+	printf("%d\n", ft_strncmp(str6, str1, size));
+	printf("%d\n", strncmp(str6, str1, size));
+	size = 6;
+	printf("%d\n", ft_strncmp("test\200", "test\0", size));
+	printf("%d\n", strncmp("test\200", "test\0", size));
+	size = 4;
+	printf("%d\n", ft_strncmp("\201", "A", size));
+	printf("%d\n", strncmp("\201", "A", size));
+}
+*/