----------------------------------------------------------------------------------
                      VFP 9.0 FIX - THE MAXIMUM NUMBER OF CHARACTERS FOR THE GETENV() FUNCTION
                                November 2019
                 ----------------------------------------------------------------------------------
                                    CCB



1. BUG:

     In vfp9 (and vfp6, vfp7, vfp8), the maximum number of characters for the GETENV() function is 255,
     now the maximum number of characters for the GETENV() function is 8191.


2. CAUSE:

     There are some BUGs in the following code.


3. RESOLUTION:

     We can write some code to fix the BUG.

     Label45e0cc ::
             push ebp                                                        ;0x0045e0cc :        55
             mov ebp , esp                                                   ;0x0045e0cd :        8bec
             and esp , 0FFFFFFF8h                                            ;0x0045e0cf :        83e4f8


     ;
     ;                 ----------------------------------------------------------------------------------
     ;                      VFP 9.0 FIX - THE MAXIMUM NUMBER OF CHARACTERS FOR THE GETENV() FUNCTION
     ;                                November 2019
     ;                 ----------------------------------------------------------------------------------
     ;                                     CCB
     ;
     ; In vfp9, the maximum number of characters for the GETENV() function is 255,
     ; now the maximum number of characters for the GETENV() function is 8191.
     ;
     ; 2019/11/20, by ccb
     ;

             sub esp , 020Ch                                                 ;0x0045e0d2 :        81ec0c020000

             mov eax , 0220Ch                                                 ;0x0045e0d2 :        81ec0c020000
             call Fun42c118


             mov eax ,  dword ptr [ Data937090 ]                             ;0x0045e0d8 :        a190709300
             push ebx                                                        ;0x0045e0dd :        53
             push esi                                                        ;0x0045e0de :        56
             push edi                                                        ;0x0045e0df :        57


     ;
     ;                 ----------------------------------------------------------------------------------
     ;                      VFP 9.0 FIX - THE MAXIMUM NUMBER OF CHARACTERS FOR THE GETENV() FUNCTION
     ;                                November 2019
     ;                 ----------------------------------------------------------------------------------
     ;                                     CCB
     ;
     ; In vfp9, the maximum number of characters for the GETENV() function is 255,
     ; now the maximum number of characters for the GETENV() function is 8191.
     ;
     ; 2019/11/20, by ccb
     ;

     ;         mov  dword ptr [ esp + 0214h ] , eax                            ;0x0045e0e0 :        89842414020000
             mov  dword ptr [ esp + 0214h ][02000h] , eax                            ;0x0045e0e0 :        89842414020000


             call Fun420d8c                                                  ;0x0045e0e7 :        e8a02cfcff
             mov esi , eax                                                   ;0x0045e0ec :        8bf0
             mov  dword ptr [ esp + 12 ] , esi                               ;0x0045e0ee :        8974240c
             call Fun42371d                                                  ;0x0045e0f2 :        e82656fcff
             mov  ecx , dword ptr [ esi + 8 ]                                ;0x0045e0f7 :        8b4e08
             mov eax , 0FFh                                                  ;0x0045e0fa :        b8ff000000
             cmp ecx , eax                                                   ;0x0045e0ff :        3bc8
             ja Label45e105                                                  ;0x0045e101 :        7702
             mov eax , ecx                                                   ;0x0045e103 :        8bc1

     Label45e105 ::
             mov  edx , dword ptr [ esi + 32 ]                               ;0x0045e105 :        8b5620
             mov  esi , dword ptr [edx]                                      ;0x0045e108 :        8b32
             mov ecx , eax                                                   ;0x0045e10a :        8bc8
             mov edx , ecx                                                   ;0x0045e10c :        8bd1
             shr ecx , 02h                                                   ;0x0045e10e :        c1e902
             lea edi ,  dword ptr [ esp + 16 ]                               ;0x0045e111 :        8d7c2410
             rep movsd                                                       ;0x0045e115 :        f3a5
             mov ecx , edx                                                   ;0x0045e117 :        8bca
             and ecx , 03h                                                   ;0x0045e119 :        83e103
             rep movsb                                                       ;0x0045e11c :        f3a4
             lea esi ,  dword ptr [ esp + 16 ]                               ;0x0045e11e :        8d742410
             mov ecx , esi                                                   ;0x0045e122 :        8bce
             mov  byte ptr [ esp + eax + 16 ] , 00h                          ;0x0045e124 :        c644041000
             call Fun414a67                                                  ;0x0045e129 :        e83969fbff


     ;
     ;                 ----------------------------------------------------------------------------------
     ;                      VFP 9.0 FIX - THE MAXIMUM NUMBER OF CHARACTERS FOR THE GETENV() FUNCTION
     ;                                November 2019
     ;                 ----------------------------------------------------------------------------------
     ;                                     CCB
     ;
     ; In vfp9, the maximum number of characters for the GETENV() function is 255,
     ; now the maximum number of characters for the GETENV() function is 8191.
     ;
     ; 2019/11/20, by ccb
     ;

     ;         pushd 0100h                                                     ;0x0045e12e :        6800010000
             pushd 02000h                                                     ;0x0045e12e :        6800010000


             mov eax , esi                                                   ;0x0045e133 :        8bc6
             push eax                                                        ;0x0045e135 :        50
             lea ebx ,  dword ptr [ esp + 0118h ]                            ;0x0045e136 :        8d9c2418010000
             call Fun41513d                                                  ;0x0045e13d :        e8fb6ffbff
             mov  eax , dword ptr [ esp + 12 ]                               ;0x0045e142 :        8b44240c
             mov ecx , ebx                                                   ;0x0045e146 :        8bcb
             push ecx                                                        ;0x0045e148 :        51
             call Fun53c75b                                                  ;0x0045e149 :        e80de60d00


     ;
     ;                 ----------------------------------------------------------------------------------
     ;                      VFP 9.0 FIX - THE MAXIMUM NUMBER OF CHARACTERS FOR THE GETENV() FUNCTION
     ;                                November 2019
     ;                 ----------------------------------------------------------------------------------
     ;                                     CCB
     ;
     ; In vfp9, the maximum number of characters for the GETENV() function is 255,
     ; now the maximum number of characters for the GETENV() function is 8191.
     ;
     ; 2019/11/20, by ccb
     ;

     ;         mov  ecx , dword ptr [ esp + 0214h ]                            ;0x0045e14e :        8b8c2414020000
             mov  ecx , dword ptr [ esp + 0214h ][02000h]                            ;0x0045e14e :        8b8c2414020000


             call Fun42bf1d                                                  ;0x0045e155 :        e8c3ddfcff
             pop edi                                                         ;0x0045e15a :        5f
             pop esi                                                         ;0x0045e15b :        5e
             pop ebx                                                         ;0x0045e15c :        5b
             mov esp , ebp                                                   ;0x0045e15d :        8be5
             pop ebp                                                         ;0x0045e15f :        5d
             ret                                                             ;0x0045e160 :        c3


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_vfp9fix102.asp
     http://www.baiyujia.com/vfpdocuments/f_vfp9fix103.asp

     2, microsoft.com:
     https://blogs.msdn.microsoft.com/calvin_hsia/2005/12/09/getenv-environment-variable-question/


6. OTHER:

     For reference only, there is no guarantees.

     Any questions or suggestions, please send me an email at ccb2000@163.com.