1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
; Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either
; version 2 of the License, or (at your option) any later version.
;
; 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
|
