metalsvm/arch/x86/kernel/string64.asm

; 
; Written by the Chair for Operating Systems, RWTH Aachen University
; 
; NO Copyright (C) 2010-2012, Stefan Lankes
; consider these trivial functions to be public domain.
; 
; These functions are distributed on an "AS IS" BASIS,
; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;

[BITS 64]
SECTION .text
global strcpy
strcpy:
   push rdi

L1:
   lodsb
   stosb
   test al, al
   jne L1
   
   pop rax
   ret

global strncpy
strncpy:
   push rdi
   mov rcx, rdx

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

L3:
   pop rax
   ret

SECTION .note.GNU-stack noalloc noexec nowrite progbits