-------------------------------------------------
                      VFP 9.0 FIX - THE COMMAND-LINE OPTIONS
                                  July 2019
                 -------------------------------------------------
                                     CCB



1. BUG:

     In vfp9 (and vfp6, vfp7, vfp8), the command-line options can only use <= 255 bytes, now it can use <= 4095 bytes.

     Usually, we can pass a maximum of 26 parameters from the command-line options.


2. CAUSE:

     There are some BUGs in the following code.


3. RESOLUTION:

     We can write some code to fix the BUG.

     Fun403e79 :: ; proc near
             push ebp                                                        ;0x00403e79 :        55
             mov ebp , esp                                                   ;0x00403e7a :        8bec
             sub esp , 05Ch                                                  ;0x00403e7c :        83ec5c
             mov  eax , dword ptr [ ebp + 8 ]                                ;0x00403e7f :        8b4508
             cmp  byte ptr [eax] , 00h                                       ;0x00403e82 :        803800
             push ebx                                                        ;0x00403e85 :        53
             push esi                                                        ;0x00403e86 :        56
             mov  esi , dword ptr [ ebp + 12 ]                               ;0x00403e87 :        8b750c
             push edi                                                        ;0x00403e8a :        57
             je Label403f1c                                                  ;0x00403e8b :        0f848b000000
             lea ecx ,  dword ptr [ eax + 1 ]                                ;0x00403e91 :        8d4801

     Label403e94 ::
             mov  dl , byte ptr [eax]                                        ;0x00403e94 :        8a10
             inc eax                                                         ;0x00403e96 :        40
             test dl , dl                                                    ;0x00403e97 :        84d2
             jne Label403e94                                                 ;0x00403e99 :        75f9
             sub eax , ecx                                                   ;0x00403e9b :        2bc1


     ;
     ;                 -------------------------------------------------
     ;                      VFP 9.0 FIX - THE COMMAND-LINE OPTIONS
     ;                                  July 2019
     ;                 -------------------------------------------------
     ;                                     CCB
     ;
     ; In vfp9, the command-line options can only use <= 255 bytes, now it can use <= 4095 bytes.
     ;
     ; 2019/7/10, by ccb
     ;

     ;         mov ebx , 0100h                                                 ;0x00403e9d :        bb00010000
             mov ebx , 01000h                                                 ;0x00403e9d :        bb00010000


             lea ecx ,  dword ptr [ esi + 0842h ]                            ;0x00403ea2 :        8d8e42080000
             mov edx , ebx                                                   ;0x00403ea8 :        8bd3
             mov  dword ptr [ ebp - 8 ] , eax                                ;0x00403eaa :        8945f8


     ;
     ;                 -------------------------------------------------
     ;                      VFP 9.0 FIX - THE COMMAND-LINE OPTIONS
     ;                                  July 2019
     ;                 -------------------------------------------------
     ;                                     CCB
     ;
     ; In vfp9, the command-line options can only use <= 255 bytes, now it can use <= 4095 bytes.
     ;
     ; 2019/7/10, by ccb
     ;

     ;         lea edi ,  dword ptr [ esi + 0942h ]                            ;0x00403ead :        8dbe42090000
             lea edi ,  dword ptr [ esi - 1000h ]                            ;0x00403ead :        8dbe42090000


             call Fun41b81c                                                  ;0x00403eb3 :        e864790100
             mov edx , ebx                                                   ;0x00403eb8 :        8bd3
             mov ecx , edi                                                   ;0x00403eba :        8bcf
             mov  dword ptr [ ebp - 4 ] , eax                                ;0x00403ebc :        8945fc
             call Fun41b81c                                                  ;0x00403ebf :        e858790100
             mov  ecx , dword ptr [ ebp - 4 ]                                ;0x00403ec4 :        8b4dfc
             add  ecx , dword ptr [ ebp - 8 ]                                ;0x00403ec7 :        034df8
             add eax , ecx                                                   ;0x00403eca :        03c1
             cmp eax , ebx                                                   ;0x00403ecc :        3bc3
             jnl Label403f16                                                 ;0x00403ece :        7d46
             mov  eax , dword ptr [ esi + 0A50h ]                            ;0x00403ed0 :        8b86500a0000
             xor edi , edi                                                   ;0x00403ed6 :        33ff
             cmp eax , edi                                                   ;0x00403ed8 :        3bc7
             je Label403f23                                                  ;0x00403eda :        7447
             cmp  dword ptr [ Data93a7fc ] , 03h                             ;0x00403edc :        833dfca7930003
             je Label5773eb                                                  ;0x00403ee3 :        0f8402351700
             cmp eax , 01h                                                   ;0x00403ee9 :        83f801
             mov eax , offset Data918008                                              ;0x00403eec :        b808809100
             je Label403ef8                                                  ;0x00403ef1 :        7405
             mov eax , offset Data918004                                              ;0x00403ef3 :        b804809100

     Label403ef8 ::
             push eax                                                        ;0x00403ef8 :        50


     ;
     ;                 -------------------------------------------------
     ;                      VFP 9.0 FIX - THE COMMAND-LINE OPTIONS
     ;                                  July 2019
     ;                 -------------------------------------------------
     ;                                     CCB
     ;
     ; In vfp9, the command-line options can only use <= 255 bytes, now it can use <= 4095 bytes.
     ;
     ; 2019/7/10, by ccb
     ;

     ;         lea edi ,  dword ptr [ esi + 0942h ]                            ;0x00403ef9 :        8dbe42090000
             lea edi ,  dword ptr [ esi - 1000h ]                            ;0x00403ef9 :        8dbe42090000


             call Fun42e055                                                  ;0x00403eff :        e851a10200
             push  dword ptr [ ebp + 8 ]                                     ;0x00403f04 :        ff7508
             call Fun42e055                                                  ;0x00403f07 :        e849a10200
             pushd offset Data917f4c                                                  ;0x00403f0c :        684c7f9100

     Label403f11 ::
             call Fun42e055                                                  ;0x00403f11 :        e83fa10200

     Label403f16 ::
             inc  dword ptr [ esi + 0A50h ]                                  ;0x00403f16 :        ff86500a0000

     Label403f1c ::
             pop edi                                                         ;0x00403f1c :        5f
             pop esi                                                         ;0x00403f1d :        5e
             pop ebx                                                         ;0x00403f1e :        5b
             leave                                                           ;0x00403f1f :        c9
             ret 08h                                                         ;0x00403f20 :        c20800


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, microsoft.com:
     https://social.msdn.microsoft.com/Forums/en-US/feeea559-4183-4fed-9081-3879e0d087de/command-line-parameters-length-limitation

     3, tek-tips.com:
     https://www.tek-tips.com/viewthread.cfm?qid=1062921
     https://www.tek-tips.com/viewthread.cfm?qid=1752644

     4, berezniker.com:
     https://www.berezniker.com/content/pages/visual-foxpro/how-pass-parameters-vfp-exe


6. OTHER:

     For reference only, there is no guarantees.

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