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[BUG/PRB.] VFP 9.0 FIX - THE DISPLAY WIDTH AND THE DECIMAL PLACES OF NUMERIC DATA FOR NUMERIC OPERATORS
January 2024
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CCB
1. BUG:
In vfp9 (and vfp6, vfp7, vfp8), for numeric operators,
usually the maximum display width of numeric data is 40 (0x28), the maximum decimal places of numeric data is 18 (0x12),
but somtimes the display width of numeric data is a negative integer, or the decimal places of numeric data is a negative integer.
The bug occurs in the following operators and functions:
addition (+) operator
subtraction (-) operator
multiplication (*) operator
division (/) operator
modulus (%) operator or MOD() function
ROUND() function
In Visual FoxPro Advanced, for numeric operators,
the maximum display width of numeric data is 40 (0x28), the maximum decimal places of numeric data is 18 (0x12),
and there is no the bug.
2. CAUSE:
There are some BUGs in the following code.
3. RESOLUTION:
We can write some code to fix the BUG.
Label420ee3 ::
je Label58fc5e ;0x00420ee3 : 0f8475ed1600
cmp eax , 04949h ;0x00420ee9 : 3d49490000
jg Label525e70 ;0x00420eee : 0f8f7c4f1000
jne Label420f26 ;0x00420ef4 : 7530
lea edx , dword ptr [ ebx + 12 ] ;0x00420ef6 : 8d530c
lea ecx , dword ptr [ esi + 12 ] ;0x00420ef9 : 8d4e0c
call Fun525dbc ;0x00420efc : e8bb4e1000
test eax , eax ;0x00420f01 : 85c0
jne Label58fc85 ;0x00420f03 : 0f857ced1600
mov eax , dword ptr [ esi + 4 ] ;0x00420f09 : 8b4604
mov ebx , dword ptr [ ebx + 4 ] ;0x00420f0c : 8b5b04
cmp eax , ebx ;0x00420f0f : 3bc3
;
; ------------------------------------------------------------------------------------------------------
; VFP 9.0 FIX - THE DISPLAY WIDTH AND THE DECIMAL PLACES OF NUMERIC DATA FOR NUMERIC OPERATORS
; February 2023
; ------------------------------------------------------------------------------------------------------
; CCB
;
; In vfp9 (and vfp6, vfp7, vfp8), for the addition (+) operator,
; usually the maximum display width of numeric data is 40 (0x28), the maximum decimal places of numeric data is 18 (0x12),
; but somtimes the display width of numeric data is a negative integer, or the decimal places of numeric data is a negative integer.
; In Visual FoxPro Advanced, for the addition (+) operator,
; the maximum display width of numeric data is 40 (0x28), the maximum decimal places of numeric data is 18 (0x12),
; and there is no the bug.
;
; 2023/2/10, by ccb
;
; jle Label5067d4 ;0x00420f11 : 0f8ebd580e00
jbe Label5067d4 ;0x00420f11 : 0f8ebd580e00
Label420f17 ::
mov dword ptr [ esi + 4 ] , eax ;0x00420f17 : 894604
inc eax ;0x00420f1a : 40
cmp eax , 028h ;0x00420f1b : 83f828
;
; ------------------------------------------------------------------------------------------------------
; VFP 9.0 FIX - THE DISPLAY WIDTH AND THE DECIMAL PLACES OF NUMERIC DATA FOR NUMERIC OPERATORS
; February 2023
; ------------------------------------------------------------------------------------------------------
; CCB
;
; In vfp9 (and vfp6, vfp7, vfp8), for the addition (+) operator,
; usually the maximum display width of numeric data is 40 (0x28), the maximum decimal places of numeric data is 18 (0x12),
; but somtimes the display width of numeric data is a negative integer, or the decimal places of numeric data is a negative integer.
; In Visual FoxPro Advanced, for the addition (+) operator,
; the maximum display width of numeric data is 40 (0x28), the maximum decimal places of numeric data is 18 (0x12),
; and there is no the bug.
;
; 2023/2/10, by ccb
;
; jnl Label58fc91 ;0x00420f1e : 0f8d6ded1600
jnb Label58fc91 ;0x00420f1e : 0f8d6ded1600
jmp Label420eab ;0x00420f24 : eb85
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
http://www.baiyujia.com/vfpdocuments/f_vfp9fix86.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix105.asp
http://www.baiyujia.com/vfpdocuments/f_vfp9fix243.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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