ft_memcmp: initial implementation

also fix a small clarity issue in ft_strncmp

Makefile

@@ -6,7 +6,7 @@
 #    By: kcolin <marvin@42.fr>                      +#+  +:+       +#+         #
 #                                                 +#+#+#+#+#+   +#+            #
 #    Created: 2024/10/14 13:43:59 by kcolin            #+#    #+#              #
-#    Updated: 2024/10/16 13:50:09 by kcolin           ###   ########.fr        #
+#    Updated: 2024/10/16 15:22:08 by kcolin           ###   ########.fr        #
 #                                                                              #
 # **************************************************************************** #
 
@@ -29,7 +29,8 @@ SOURCES = ft_isalpha.c \
 	ft_strchr.c \
 	ft_strrchr.c \
 	ft_strncmp.c \
-	ft_memchr.c
+	ft_memchr.c \
+	ft_memcmp.c
 OBJECTS = $(SOURCES:.c=.o)
 CC = gcc
 

ft_memcmp.c

@@ -0,0 +1,48 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_memcmp.c                                        :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/10/16 15:26:08 by kcolin            #+#    #+#             */
+/*   Updated: 2024/10/16 15:31:27 by kcolin           ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+
+int	ft_memcmp(const void *s1, const void *s2, size_t n)
+{
+	size_t	i;
+
+	i = 0;
+	while (1)
+	{
+		if (i >= n)
+			return (0);
+		if (((unsigned char *)s1)[i] != ((unsigned char *)s2)[i])
+			break ;
+		i++;
+	}
+	return (((unsigned char *)s1)[i] - ((unsigned char *)s2)[i]);
+}
+
+/*
+#include <stdio.h>
+#include <string.h>
+
+int	main(int argc, char **argv)
+{
+	size_t	cmp_len;
+
+	cmp_len = 0;
+	if (argc > 2)
+	{
+		printf("mine: %d\tlib: %d\n",
+			ft_memcmp(argv[1], argv[2], cmp_len),
+			memcmp(argv[1], argv[2], cmp_len));
+	}
+	return (0);
+}
+*/

ft_strncmp.c

@@ -17,7 +17,7 @@ int	ft_strncmp(const char *s1, const char *s2, size_t n)
 	size_t	i;
 
 	i = 0;
-	while (s1[i] != '\0' && s2[i] != 0)
+	while (s1[i] != '\0' && s2[i] != '\0')
 	{
 		if (i >= n)
 			return (0);

libft.h

@@ -6,7 +6,7 @@
 /*   By: kcolin <marvin@42.fr>                      +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2024/10/15 10:11:54 by kcolin            #+#    #+#             */
-/*   Updated: 2024/10/16 15:16:50 by kcolin           ###   ########.fr       */
+/*   Updated: 2024/10/16 15:25:46 by kcolin           ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -38,5 +38,6 @@ char	*ft_strrchr(const char *s, int c);
 int		ft_strncmp(const char *s1, const char *s2, size_t n);
 
 void	*ft_memchr(const void *s, int c, size_t n);
+int		ft_memcmp(const void *s1, const void *s2, size_t n);
 
 #endif