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%include "defs.asm"
;************************* strcpy64.asm ************************************
; Author: Agner Fog
; Date created: 2008-07-19
; Last modified: 2011-07-01
; Description:
; Faster version of the standard strcpy function:
; char * A_strcpy(char * dest, const char * src);
; Copies zero-terminated string from src to dest, including terminating zero.
;
; Overriding standard function memcpy:
; The alias ?OVR_strcpy is changed to _strcpy in the object file if
; it is desired to override the standard library function strcpy.
;
; Optimization:
; Uses optimized functions A_strlen and A_memcpy. These functions allow
; calling without proper stack alignment.
;
; Copyright (c) 2011 GNU General Public License www.gnu.org/licenses
;******************************************************************************
default rel
global A_strcpy: function ; Function A_strcpy
global EXP(strcpy): function ; ?OVR removed if standard function memcpy overridden
; Imported from strlen64.asm
extern A_strlen
; Imported from memcpy64.asm
extern A_memcpy
SECTION .text align=16
; extern "C" char * A_strcpy(char * dest, const char * src) {
; return memcpy(dest, src, strlen(src)+1);
; }
; Function entry:
A_strcpy:
EXP(strcpy):
%IFDEF WINDOWS
%define Rpar1 rcx ; function parameter 1
%define Rpar2 rdx ; function parameter 2
%define Rpar3 r8 ; function parameter 3
%ENDIF
%IFDEF UNIX
%define Rpar1 rdi ; function parameter 1
%define Rpar2 rsi ; function parameter 2
%define Rpar3 rdx ; function parameter 3
%ENDIF
push Rpar1 ; dest
push Rpar2 ; src
mov Rpar1, Rpar2
; (A_strlen does not require stack alignment)
call A_strlen ; length of src
lea Rpar3,[rax+1] ; include terminating zero in length
pop Rpar2 ; src
pop Rpar1 ; dest
jmp A_memcpy ; copy and return
;A_strcpy ENDP
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