; 
; Copyright 2010 Stefan Lankes, Chair for Operating Systems,
;                               RWTH Aachen University
;
; Licensed under the Apache License, Version 2.0 (the "License");
; you may not use this file except in compliance with the License.
; You may obtain a copy of the License at
;
;     http://www.apache.org/licenses/LICENSE-2.0
;
; Unless required by applicable law or agreed to in writing, software
; distributed under the License is distributed on an "AS IS" BASIS,
; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
; See the License for the specific language governing permissions and
; limitations under the License.
;
; This file is part of metalsvm.

; This is the kernel's entry point. We could either call main here,
; or we can use this to setup the stack or other nice stuff, like
; perhaps setting up the GDT and segments. Please note that interrupts
; are disabled at this point: More on interrupts later!

[BITS 32]
SECTION .code
global strcpy
strcpy:
   push ebp
   mov ebp, esp
   push edi
   push esi

   mov esi, [ebp+12]
   mov edi, [ebp+8]

L1:
   lodsb
   stosb
   test al, al
   jne L1
   
   mov eax, [ebp+8]
   pop esi
   pop edi
   pop ebp
   ret

global strncpy
strncpy:
   push ebp
   mov ebp, esp
   push edi
   push esi

   mov ecx, [ebp+16]
   mov esi, [ebp+12]
   mov edi, [ebp+8]

L2:
   dec ecx
   js L3
   lodsb
   stosb
   test al, al
   jne L1
   rep
   stosb

L3:
   mov eax, [ebp+8]
   pop esi
   pop edi
   pop ebp
   ret