From 13628b49b896a6143d067188d1d9b90c40e38e3d Mon Sep 17 00:00:00 2001
From: lohhiiccc <loic@lohic.dev>
Date: Fri, 12 Jun 2026 16:23:17 +0200
Subject: [PATCH] feat: ft_memcpy

---
 Makefile          |  3 ++-
 src/ft_memcpy.asm | 17 +++++++++++++++++
 src/libasm.h      |  5 +++--
 3 files changed, 22 insertions(+), 3 deletions(-)
 create mode 100644 src/ft_memcpy.asm

diff --git a/Makefile b/Makefile
index 5e636aa..6907a9d 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,8 @@ SRCS=$(SRC_DIR)/ft_strlen.asm \
 		 $(SRC_DIR)/ft_strcmp.asm \
 		 $(SRC_DIR)/ft_write.asm \
 		 $(SRC_DIR)/ft_read.asm \
-		 $(SRC_DIR)/ft_strdup.asm
+		 $(SRC_DIR)/ft_strdup.asm \
+		 $(SRC_DIR)/ft_memcpy.asm
 
 OBJS=$(patsubst $(SRC_DIR)/%.asm,$(OBJ_DIR)/%.o,$(SRCS))
 DEPS=$(OBJS:.o=.d)
diff --git a/src/ft_memcpy.asm b/src/ft_memcpy.asm
new file mode 100644
index 0000000..d4028bc
--- /dev/null
+++ b/src/ft_memcpy.asm
@@ -0,0 +1,17 @@
+global ft_memcpy
+section .text
+
+; rdi: dest
+; rsi: src
+; rdx: len
+
+ft_memcpy:
+	mov		rax, rdi
+	test	rdx, rdx
+	je		.done
+
+	cld
+	mov		rcx, rdx
+	rep		movsb
+.done:
+	ret
diff --git a/src/libasm.h b/src/libasm.h
index 829d0e8..2df3ccd 100644
--- a/src/libasm.h
+++ b/src/libasm.h
@@ -6,12 +6,13 @@
 extern "C" {
 #endif
 
-size_t	ft_strlen(char *str);
+size_t	ft_strlen(const char *str);
 char		*ft_strcpy(char *dest, const char *src);
 int			ft_strcmp (const char *p1, const char *p2);
 ssize_t	ft_write(int fildes, const void *buf, size_t nbyte);
 char		*strdup(const char *s);
-ssize_t	read(int fd, void *buf, size_t count);
+ssize_t	ft_read(int fd, void *buf, size_t count);
+void		*ft_memcpy(void *dest, const void *src, size_t n);
 
 #ifdef __cplusplus
 }