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[BUG/PRB.] VFP 9.0 FIX - CHECK AVAILABLE MEMORY FOR CREATING A BINARY INDEX
January 2024
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CCB
1. BUG:
If we enable checking available memory for creating a binary index in Visual FoxPro Advanced,
but there is not enough memory to create the binary index,
it will cause the error "There is not enough memory to complete this operation (Error 43)".
It is the startup default for Visual FoxPro Advanced.
If we disable checking available memory for creating a binary index in Visual FoxPro Advanced,
but there is not enough memory to create the binary index,
it will enter an infinite loop, it is the same as Visual FoxPro 9.0 and earlier versions.
There is the bug for creating a binary index in Visual FoxPro 9.0.
There is no the bug for creating a non-binary index in Visual FoxPro 9.0.
There is no the bug in Visual FoxPro 8.0 and earlier versions.
2. CAUSE:
To create a binary index in Visual FoxPro,
it needs 16 bytes per record.
If RECCOUNT()=90000000,
it needs 16 * 90000000 = 1440000000 bytes < 1466695680 bytes (the SYS(3050,1) default setting),
so it can create the binary index.
If RECCOUNT()=100000000,
it needs 16 * 100000000 = 1600000000 bytes > 1466695680 bytes (the SYS(3050,1) default setting),
so it can't create the binary index.
3. RESOLUTION:
We can write some code to fix the BUG.
Fun4203bc :: ; proc near
mov eax , dword ptr [ Data937584 ] ;0x004203bc : a184759300
mov ecx , dword ptr [ Data9370d4 ] ;0x004203c1 : 8b0dd4709300
push ebx ;0x004203c7 : 53
push ebp ;0x004203c8 : 55
mov ebp , dword ptr [ esp + 12 ] ;0x004203c9 : 8b6c240c
mov ebx , dword ptr [ ebp + 24 ] ;0x004203cd : 8b5d18
push esi ;0x004203d0 : 56
sub eax , dword ptr [ Data9392ac ] ;0x004203d1 : 2b05ac929300
add ebx , 04h ;0x004203d7 : 83c304
cmp ecx , eax ;0x004203da : 3bc8
mov dword ptr [ esp + 16 ] , 00h ;0x004203dc : c744241000000000
jb Label5a5bcb ;0x004203e4 : 0f82e1571800
sub ecx , eax ;0x004203ea : 2bc8
Label4203ec ::
mov eax , dword ptr [ Data937784 ] ;0x004203ec : a184779300
add eax , ecx ;0x004203f1 : 03c1
mov ecx , eax ;0x004203f3 : 8bc8
shr ecx , 1 ;0x004203f5 : d1e9
cmp eax , 020000h ;0x004203f7 : 3d00000200
jbe Label420485 ;0x004203fc : 0f8683000000
lea esi , dword ptr [ eax + 0FFFE0000h ] ;0x00420402 : 8db00000feff
Label420408 ::
cmp ecx , esi ;0x00420408 : 3bce
ja Label5a5bd2 ;0x0042040a : 0f87c2571800
Label420410 ::
test esi , esi ;0x00420410 : 85f6
je Label5a5bd9 ;0x00420412 : 0f84c1571800
mov ecx , dword ptr [ ebp + 28 ] ;0x00420418 : 8b4d1c
mov eax , ecx ;0x0042041b : 8bc1
imul eax , ebx ;0x0042041d : 0fafc3
cmp eax , 01h ;0x00420420 : 83f801
jbe Label5a5be3 ;0x00420423 : 0f86ba571800
Label420429 ::
;
; --------------------------------------------------------------------------
; VFP 9.0 FIX - CHECK AVAILABLE MEMORY FOR CREATING A BINARY INDEX
; September 2020
; --------------------------------------------------------------------------
; CCB
;
; Check available memory for creating a binary index.
;
; 2020/9/21, by ccb
;
cmp dword ptr vfpa_sys9036_data,00h
je Label42042a
cmp dword ptr [ esp + 0Ch ] , offset Label41eae2 ;; Fun41ea8e .. ; proc near
jne Label42042a
cmp dword ptr [ esp + 0Ch + (4+08h+74h) ] , offset Label422b9b ;; Fun422926 .. ; proc near
jne Label42042a
test byte ptr [ ebp + 66 ] , 02h
je Label42042a
cmp eax , esi
ja Label5a5bd9
Label42042a ::
dec eax ;0x00420429 : 48
xor edx , edx ;0x0042042a : 33d2
div esi ;0x0042042c : f7f6
push edi ;0x0042042e : 57
pushd 00h ;0x0042042f : 6a00
mov esi , eax ;0x00420431 : 8bf0
mov eax , ecx ;0x00420433 : 8bc1
inc esi ;0x00420435 : 46
cdq ;0x00420436 : 99
idiv esi ;0x00420437 : f7fe
mov esi , eax ;0x00420439 : 8bf0
add esi , 02h ;0x0042043b : 83c602
mov edi , esi ;0x0042043e : 8bfe
imul edi , ebx ;0x00420440 : 0faffb
call Fun42db6a ;0x00420443 : e822d70000
test eax , eax ;0x00420448 : 85c0
mov dword ptr [ ebp + 36 ] , eax ;0x0042044a : 894524
je Label5a5bed ;0x0042044d : 0f849a571800
Label420453 ::
mov ecx , dword ptr [ ebp + 36 ] ;0x00420453 : 8b4d24
xor eax , eax ;0x00420456 : 33c0
test esi , esi ;0x00420458 : 85f6
pop edi ;0x0042045a : 5f
jle Label5a5c25 ;0x0042045b : 0f8ec4571800
mov eax , esi ;0x00420461 : 8bc6
nop ;0x00420463 : 90
Label420464 ::
mov edx , dword ptr [ esp + 16 ] ;0x00420464 : 8b542410
mov dword ptr [ecx] , edx ;0x00420468 : 8911
mov dword ptr [ esp + 16 ] , ecx ;0x0042046a : 894c2410
add ecx , ebx ;0x0042046e : 03cb
dec eax ;0x00420470 : 48
jne Label420464 ;0x00420471 : 75f1
mov eax , dword ptr [ esp + 16 ] ;0x00420473 : 8b442410
mov ecx , dword ptr [ esp + 20 ] ;0x00420477 : 8b4c2414
mov dword ptr [ecx] , eax ;0x0042047b : 8901
mov eax , esi ;0x0042047d : 8bc6
pop esi ;0x0042047f : 5e
pop ebp ;0x00420480 : 5d
pop ebx ;0x00420481 : 5b
ret 08h ;0x00420482 : c20800
4. APPLIES TO:
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
http://www.baiyujia.com/vfpdocuments/f_vfp9fix125.asp
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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