1 files changed, 20 insertions, 0 deletions
diff --git a/kernel/libc/string/memcpy.c b/kernel/libc/string/memcpy.c
new file mode 100644
index 0000000..5c04407
--- /dev/null
+++ b/kernel/libc/string/memcpy.c
@@ -0,0 +1,20 @@
+#include "../include/string.h"
+
+void *
+memcpy(void *dest, const void *src, uint32_t n) {
+  unsigned char *d = dest;
+  const unsigned char *s = src;
+
+  for (; n >= 8; n -= 8, d += 8, s += 8)
+    *(uint64_t *)d = *(uint64_t *)s;
+
+  for (; n >= 4; n -= 4, d += 4, s += 4)
+    *(uint32_t *)d = *(uint32_t *)s;
+
+  for (; n >= 2; n -= 2, d += 2, s += 2)
+    *(uint16_t *)d = *(uint16_t *)s;
+
+  for (; n; n--)
+    *d++ = *s++;
+  return dest;
+}