From 098330c845b052d5bc89471fbd85264e9dc8889b Mon Sep 17 00:00:00 2001
From: Mathieu Maret <mathieu.maret@gmail.com>
Date: Sun, 5 Mar 2023 20:34:24 +0100
Subject: [PATCH] Add memmove to klibc

---
 core/klibc.c | 10 ++++++++++
 core/klibc.h |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/core/klibc.c b/core/klibc.c
index 6a98c78..fbef3b5 100644
--- a/core/klibc.c
+++ b/core/klibc.c
@@ -30,6 +30,16 @@ int memcmp(const void *aptr, const void *bptr, size_t size)
 /* Threshhold for punting to the byte copier.  */
 #define TOO_SMALL(LEN)  ((LEN) < BIGBLOCKSIZE)
 
+void *memmove(void *dst, const void *src, size_t n)
+{
+    char *dstChar       = dst;
+    const char *srcChar = src;
+    for (size_t i = 0; i < n; i++) {
+        *(dstChar++) = *(srcChar++);
+    }
+    return dst;
+}
+
 void *memcpy(void *dst0, const void *src0, size_t len0)
 {
 #if 0
diff --git a/core/klibc.h b/core/klibc.h
index d29103a..435282e 100644
--- a/core/klibc.h
+++ b/core/klibc.h
@@ -11,7 +11,15 @@
      ((c) == '\v'))
 #define isprint(c) ((' ' <= (c)) && ((c) <= '~'))
 
+/** compares the first @param n bytes (each interpreted as
+ *      unsigned char) of the memory areas @param s1 and @param s2.
+ */
 int memcmp(const void *s1, const void *s2, size_t n);
+
+/**
+ * copies n bytes from memory area src to memory area dest. The memory areas may overlap
+ */
+void *memmove(void *dest, const void *src, size_t n);
 void *memcpy(void *dest, const void *src, size_t n);
 void *memset(void *s, int c, size_t n);
 char *itoa(long long int value, char *str, int base);