Small code fix up

- Moved memcmp function to temporary libc/mem.h
- I/O functions are inlined
- ATA_DEVICE read function won't print the 512 bytes by default

src/libc/include/mem.h

@@ -1,3 +1,5 @@
+#pragma once
+// NOTE: These should not be inline 
 inline void* memset (void* ptr, int value, size_t num){
     for( int i = 0; i < num; i++ )
     {
@@ -6,3 +8,23 @@ inline void* memset (void* ptr, int value, size_t num){
     }
     return ptr;
 }
+
+
+
+inline int memcmp( const void* ptr1, const void* ptr2, size_t num)
+    {
+        const unsigned char * cs = (const unsigned char*) ptr1;
+        const unsigned char * ct = (const unsigned char*) ptr2;
+
+
+        for (int i = 0 ; i < num ; i++, cs++, ct++ ){
+           if( *cs < *ct){
+               return -1;
+           } else if( *cs > *ct){
+               return 1;
+           }
+        } 
+
+        return 0;
+
+    }