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[ENHANCED] VFP 9.0 FIX - REPLACE COMMAND FIELDS COUNT
January 2024
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CCB
1. BUG:
In vfp9 (and vfp6, vfp7, vfp8), the REPLACE command can only use <= 127 fields, now it can use <= 255 fields.
There is no the bug for the UPDATE command, it can use <= 254 fields.
The bug was reported by Mike Yearwood.
2. CAUSE:
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Label52e420 ::
lea edx , dword ptr [ ebp - 28 ] ;0x0052e420 : 8d55e4
lea eax , dword ptr [ ebp + 0FFFFFF38h ] ;0x0052e423 : 8d8538ffffff
call Fun42c27f ;0x0052e429 : e851deefff
push edi ;0x0052e42e : 57
push eax ;0x0052e42f : 50
call Fun42c2be ;0x0052e430 : e889deefff
add esp , 08h ;0x0052e435 : 83c408
cmp eax , edi ;0x0052e438 : 3bc7
mov dword ptr [ ebp - 32 ] , eax ;0x0052e43a : 8945e0
jne Label52e3aa ;0x0052e43d : 0f8567ffffff
mov eax , dword ptr [ Data9370f8 ] ;0x0052e443 : a1f8709300
mov ecx , dword ptr [eax] ;0x0052e448 : 8b08
mov edx , dword ptr [ ecx + 0A8h ] ;0x0052e44a : 8b91a8000000
push edx ;0x0052e450 : 52
xor edx , edx ;0x0052e451 : 33d2
xor ecx , ecx ;0x0052e453 : 33c9
call Fun52d14e ;0x0052e455 : e8f4ecffff
mov eax , dword ptr [ Data9393ac ] ;0x0052e45a : a1ac939300
cmp byte ptr [eax] , 015h ;0x0052e45f : 803815
je Label5d8b1c ;0x0052e462 : 0f84b4a60a00
xor eax , eax ;0x0052e468 : 33c0
call Fun42c118 ;0x0052e46a : e8a9dcefff
mov edx , dword ptr [ Data9370c4 ] ;0x0052e46f : 8b15c4709300
mov eax , esp ;0x0052e475 : 8bc4
sub eax , edx ;0x0052e477 : 2bc2
cmp eax , 2 * 0600h ;0x0052e479 : 3d00060000
jle Label5d8b26 ;0x0052e47e : 0f8ea2a60a00
mov eax , 2 * 0600h ;0x0052e484 : b800060000
call Fun42c118 ;0x0052e489 : e88adcefff
mov dword ptr [ ebp - 16 ] , esp ;0x0052e48e : 8965f0
Label52e491 ::
mov ebx , dword ptr [ ebp - 8 ] ;0x0052e491 : 8b5df8
Label52e494 ::
;
; -------------------------------------------------
; VFP 9.0 FIX - REPLACE COMMAND FIELDS COUNT
; August 2014
; -------------------------------------------------
; CCB
;
; In vfp9, the REPLACE command can only use <= 127 fields, now it can use <= 255 fields.
;
; 2014/8/22, by ccb
;
cmp ebx , 2 * 080h ;0x0052e494 : 81fb80000000
jnl Label5d8b2e ;0x0052e49a : 0f8d8ea60a00
pushd 0FFFFFFFFh ;0x0052e4a0 : 6aff
mov edx , 01100h ;0x0052e4a2 : ba00110000
lea ecx , dword ptr [ ebp - 80 ] ;0x0052e4a7 : 8d4db0
call Fun421184 ;0x0052e4aa : e8d52cefff
mov edx , dword ptr [ ebp - 16 ] ;0x0052e4af : 8b55f0
mov ax , word ptr [ ebp - 72 ] ;0x0052e4b2 : 668b45b8
lea ecx , dword ptr [ ebx + 2 * ebx ] ;0x0052e4b6 : 8d0c5b
lea edi , dword ptr [ edx + 4 * ecx ] ;0x0052e4b9 : 8d3c8a
mov ecx , dword ptr [ Data9370f8 ] ;0x0052e4bc : 8b0df8709300
mov word ptr [edi] , ax ;0x0052e4c2 : 668907
mov edx , dword ptr [ecx] ;0x0052e4c5 : 8b11
mov eax , dword ptr [ edx + 8 ] ;0x0052e4c7 : 8b4208
test eax , eax ;0x0052e4ca : 85c0
je Label5d8b38 ;0x0052e4cc : 0f8466a60a00
mov edx , dword ptr [ ebp - 76 ] ;0x0052e4d2 : 8b55b4
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
2, codeplex.com:
http://vfpx.codeplex.com/workitem/35381
3, foxite.com:
http://www.foxite.com/archives/undocummented-limitation-found-0000003165.htm
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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