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; Copyright (C) 2000 MySQL AB
;
; This library is free software; you can redistribute it and/or
; modify it under the terms of the GNU Library General Public
; License as published by the Free Software Foundation; version 2
; of the License.
;
; This library is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
; Library General Public License for more details.
;
; You should have received a copy of the GNU Library General Public
; License along with this library; if not, write to the Free
; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
; MA 02111-1307, USA
TITLE Optimized strxmov for MSDOS / Intel 8086
ifndef M_I386
.8087
DOSSEG
.MODEL LARGE
.CODE
PUBLIC _strxmov
_strxmov PROC
mov bx,sp
add bx,4
push si
push di
mov cx,ds ; Save ds
ASSUME DS: NOTHING
ASSUME ES: NOTHING
les di,DWORD PTR ss:[bx] ; dst
jmp next_str
start_str:
mov al,ds:[si]
movsb ; move arg
and al,al
jnz start_str ; Not last
dec di
next_str:
add bx,4
lds si,DWORD PTR ss:[bx]
mov ax,ds
or ax,si
jnz start_str
mov byte ptr es:[di],0 ; Force end null (if no source)
mov ds,cx
mov ax,di ; Return ptr to last 0
mov dx,es
pop di
pop si
ret
_strxmov ENDP
else
include macros.asm
begcode strxmov
public _strxmov
_strxmov PROC near
ASSUME DS: NOTHING
ASSUME ES: NOTHING
push EBP
mov EBP,ESP
mov EDX,EBX ; Save EBX
mov ECX,ESI ; Save ESI
push EDI
mov EDI,8[EBP] ; Get destination
lea EBX,8[EBP] ; Get adress to first source - 4
xor al,al
jmp next_str
start_str: movsb
cmp AL,[EDI-1]
jne start_str
dec EDI ; Don't copy last null
next_str: add EBX,4
mov ESI,[EBX]
or ESI,ESI
jne start_str
mov byte ptr [EDI],0 ; Force last null
mov EAX,EDI ; Return ptr to null
pop EDI
mov ESI,ECX
mov EBX,EDX
pop EBP
ret
_strxmov endp
endcode strxmov
endif
END
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