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[BUG/PRB.] VFP 9.0 FIX - SYS(2001) FUNCTION
January 2024
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CCB
1. BUG:
In vfp9 (and vfp6, vfp7, vfp8), the SYS(2001,"INDEX") function returns the incorrect result (2001).
There is the bug for the following SYS(2001) functions:
SYS(2001,"INDEX")
SYS(2001,"NOCPTRANS")
SYS(2001,"RELATION")
SYS(2001,"FIELDS",1)
There is no the bug for the SYS(2001,"ORDER") function and other SYS(2001) functions.
There is a test program:
*PROC testsys2001indexfunction
SET INDEX TO tmp2.idx ADDITIVE
?SET("INDEX") && returns the correct result
?SYS(2001,"INDEX") && returns the incorrect result (2001) in vfp9!
WAIT
RETURN
* END OF PROC TESTSYS2001INDEXFUNCTION.
2. CAUSE:
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Label60c1ac ::
mov eax , dword ptr [ Data9370f8 ] ;0x0060c1ac : a1f8709300
mov eax , dword ptr [eax] ;0x0060c1b1 : 8b00
mov eax , dword ptr [ eax + 32 ] ;0x0060c1b3 : 8b4020
or dword ptr [ ebp + 12 ] , 0FFFFFFFFh ;0x0060c1b6 : 834d0cff
test eax , eax ;0x0060c1ba : 85c0
je Label60c1cb ;0x0060c1bc : 740d
test byte ptr [ eax + 16 ] , 020h ;0x0060c1be : f6401020
je Label60c1cb ;0x0060c1c2 : 7407
mov eax , dword ptr [eax] ;0x0060c1c4 : 8b00
mov edi , dword ptr [ eax + 104 ] ;0x0060c1c6 : 8b7868
jmp Label60c1cd ;0x0060c1c9 : eb02
Label60c1cb ::
xor edi , edi ;0x0060c1cb : 33ff
Label60c1cd ::
mov eax , dword ptr [ ebp + 20 ] ;0x0060c1cd : 8b4514
;
; -------------------------------------------------------
; VFP 9.0 FIX - SYS(2001,"INDEX") FUNCTION
; January 2023
; -------------------------------------------------------
; CCB
;
; In vfp9, the SYS(2001,"INDEX") function returns 2001.
;
; 2023/1/10, by ccb
;
mov byte ptr [eax] , 048h
and dword ptr [ eax + 8 ] , 00h ;0x0060c1d0 : 83600800
test edi , edi ;0x0060c1d4 : 85ff
je Label60c274 ;0x0060c1d6 : 0f8498000000
Label60c1dc ::
mov eax , dword ptr [ Data9370f8 ] ;0x0060c1dc : a1f8709300
mov eax , dword ptr [eax] ;0x0060c1e1 : 8b00
mov eax , dword ptr [ eax + 32 ] ;0x0060c1e3 : 8b4020
lea esi , dword ptr [ ebp + 0FFFFFD90h ] ;0x0060c1e6 : 8db590fdffff
call Fun435d6b ;0x0060c1ec : e87a9be2ff
mov esi , eax ;0x0060c1f1 : 8bf0
mov eax , dword ptr [ ebp + 12 ] ;0x0060c1f3 : 8b450c
cmp eax , dword ptr [esi] ;0x0060c1f6 : 3b06
je Label60c252 ;0x0060c1f8 : 7458
mov ebx , dword ptr [ ebp + 8 ] ;0x0060c1fa : 8b5d08
cmp byte ptr [ebx] , 00h ;0x0060c1fd : 803b00
jne Label60c20b ;0x0060c200 : 7509
cmp dword ptr [ ebp + 0FFFFFDBCh ] , 0FFFFFFFCh ;0x0060c202 : 83bdbcfdfffffc
jne Label60c218 ;0x0060c209 : 750d
Label60c20b ::
lea eax , dword ptr [ ebp + 0FFFFFDB0h ] ;0x0060c20b : 8d85b0fdffff
mov ecx , ebx ;0x0060c211 : 8bcb
call Fun62bb05 ;0x0060c213 : e8edf80100
Label60c218 ::
mov eax , ebx ;0x0060c218 : 8bc3
lea ecx , dword ptr [ eax + 1 ] ;0x0060c21a : 8d4801
Label60c21d ::
mov dl , byte ptr [eax] ;0x0060c21d : 8a10
inc eax ;0x0060c21f : 40
test dl , dl ;0x0060c220 : 84d2
jne Label60c21d ;0x0060c222 : 75f9
sub eax , ecx ;0x0060c224 : 2bc1
mov ecx , dword ptr [esi] ;0x0060c226 : 8b0e
mov esi , dword ptr [ ebp + 8 ] ;0x0060c228 : 8b7508
lea edx , dword ptr [ esi + eax ] ;0x0060c22b : 8d1406
mov dword ptr [ ebp + 12 ] , ecx ;0x0060c22e : 894d0c
call Fun52d969 ;0x0060c231 : e83317f2ff
mov ebx , dword ptr [ ebp + 20 ] ;0x0060c236 : 8b5d14
pushd 0106h ;0x0060c239 : 6806010000
push esi ;0x0060c23e : 56
call Fun8e5cef ;0x0060c23f : e8ab9a2d00
test eax , eax ;0x0060c244 : 85c0
je Label60c252 ;0x0060c246 : 740a
mov dword ptr [ ebp + 0FFFFFDBCh ] , 0FFFFFFFCh ;0x0060c248 : c785bcfdfffffcffffff
Label60c252 ::
mov eax , dword ptr [edi] ;0x0060c252 : 8b07
mov edi , dword ptr [ eax + 48 ] ;0x0060c254 : 8b7830
test edi , edi ;0x0060c257 : 85ff
jne Label60c1dc ;0x0060c259 : 7581
cmp dword ptr [ ebp + 0FFFFFDBCh ] , 0FFFFFFFCh ;0x0060c25b : 83bdbcfdfffffc
jne Label60c274 ;0x0060c262 : 7510
mov ebx , dword ptr [ ebp + 20 ] ;0x0060c264 : 8b5d14
pushd 0106h ;0x0060c267 : 6806010000
push dword ptr [ ebp + 8 ] ;0x0060c26c : ff7508
call Fun8e5cef ;0x0060c26f : e87b9a2d00
Label60c274 ::
mov eax , dword ptr [ Data9370f8 ] ;0x0060c274 : a1f8709300
mov eax , dword ptr [eax] ;0x0060c279 : 8b00
mov eax , dword ptr [ eax + 32 ] ;0x0060c27b : 8b4020
test eax , eax ;0x0060c27e : 85c0
je Label60c3c5 ;0x0060c280 : 0f843f010000
test byte ptr [ eax + 16 ] , 020h ;0x0060c286 : f6401020
je Label60c3c5 ;0x0060c28a : 0f8435010000
cmp dword ptr [ eax + 52 ] , 00h ;0x0060c290 : 83783400
je Label60c3c5 ;0x0060c294 : 0f842b010000
mov ecx , dword ptr [ ebp + 8 ] ;0x0060c29a : 8b4d08
mov eax , ecx ;0x0060c29d : 8bc1
lea esi , dword ptr [ eax + 1 ] ;0x0060c29f : 8d7001
Label60c2a2 ::
mov dl , byte ptr [eax] ;0x0060c2a2 : 8a10
inc eax ;0x0060c2a4 : 40
test dl , dl ;0x0060c2a5 : 84d2
jne Label60c2a2 ;0x0060c2a7 : 75f9
sub eax , esi ;0x0060c2a9 : 2bc6
pushd 08091h ;0x0060c2ab : 6891800000
add eax , ecx ;0x0060c2b0 : 03c1
pushd offset Data92b024 ;0x0060c2b2 : 6824b09200
push eax ;0x0060c2b7 : 50
call Fun43089c ;0x0060c2b8 : e8df45e2ff
add esp , 0Ch ;0x0060c2bd : 83c40c
4. APPLIES TO:
VFP 6.0.8167.0
VFP 6.0.8961.0 (SP5)
VFP 7.0.0.9262
VFP 7.0.0.9465 (SP1)
VFP 8.0.0.2521
VFP 8.0.0.3117 (SP1)
VFP 9.0.0.2412
VFP 9.0.0.3504 (SP1)
VFP 9.0.0.4611 (SP2)
VFP 9.0.0.5015 (SP2)
VFP 9.0.0.5411 (SP2)
VFP 9.0.0.5721 (SP2)
VFP 9.0.0.5815 (SP2)
VFP 9.0.0.6303 (SP2)
VFP 9.0.0.6602 (SP2)
VFP 9.0.0.7423 (SP2)
The bug has been fixed in VFP Advanced.
5. REFERENCE WEBSITES:
1, baiyujia.com:
http://www.baiyujia.com
6. OTHER:
For reference only, there is no guarantees.
Any questions or suggestions, please send me an email at ccb2000@163.com.
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