From e3976c3f58084ccdee5b24cf526dae41b57018cd Mon Sep 17 00:00:00 2001
From: Lizzy Fleckenstein <eliasfleckenstein@web.de>
Date: Wed, 29 Nov 2023 15:59:59 +0100
Subject: add more memory functions

---
 Makefile         |  1 +
 stage3/memory.h  | 11 +++++++++++
 stage3/memory2.c | 22 ++++++++++++++++++++++
 3 files changed, 34 insertions(+)
 create mode 100644 stage3/memory.h
 create mode 100644 stage3/memory2.c

diff --git a/Makefile b/Makefile
index b9e677b..ae3b7fb 100644
--- a/Makefile
+++ b/Makefile
@@ -17,6 +17,7 @@ STAGE3 = \
 	stage3/halt.o \
 	stage3/framebuffer.o \
 	stage3/memory.o \
+	stage3/memory2.o \
 	stage3/paging.o \
 	stage3/heap.o \
 	stage3/font.o \
diff --git a/stage3/memory.h b/stage3/memory.h
new file mode 100644
index 0000000..774d596
--- /dev/null
+++ b/stage3/memory.h
@@ -0,0 +1,11 @@
+#ifndef _MEMORY_H_
+#define _MEMORY_H_
+
+#include "def.h"
+
+void memcpy(void *dst, const void *src, usize bytes); // memory.asm
+void memmove(void *dst, const void *src, usize bytes); // memory.asm
+int memcmp(const void *s1, const void *s2, usize n); // memory2.c
+u8 memsum(const void *ptr, usize size); // memory2.c
+
+#endif
diff --git a/stage3/memory2.c b/stage3/memory2.c
new file mode 100644
index 0000000..cca3cb1
--- /dev/null
+++ b/stage3/memory2.c
@@ -0,0 +1,22 @@
+#include "memory.h"
+
+int memcmp(const void *s1, const void *s2, usize n)
+{
+	for (usize i = 0; i < n; i++) {
+		unsigned char c1 = ((const unsigned char *) s1)[i];
+		unsigned char c2 = ((const unsigned char *) s2)[i];
+
+		if (c1 != c2)
+			return (int) c1 - (int) c2;
+	}
+
+	return 0;
+}
+
+u8 memsum(const void *ptr, usize size)
+{
+	u8 sum = 0;
+	for (usize i = 0; i < size; i++)
+		sum += ((const u8 *) ptr)[i];
+	return sum;
+}
-- 
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