Environment variable not visible

You can test the GetEnvironmentVariableA results with a small program like this:

Code:

format PE console
entry start

section '.text' code readable executable

start:

        push    0FFFFFFF5h ; STD_OUTPUT_HANDLE
        call    [GetStdHandle]
        mov     ebx,eax

        call    [GetCommandLineA]
        mov     esi,eax
      @@:
        lodsb
        test    al,al
        jz      fail
        cmp     al,20h
        jne     @b
      @@:
        lodsb
        cmp     al,20h
        je      @b
        dec     esi

        push    1000h
        push    buffer
        push    esi
        call    [GetEnvironmentVariableA]
        push    0
        push    tmp
        push    eax
        push    buffer
        push    ebx
        call    [WriteFile]

fail:
        push    0
        call    [ExitProcess]


display_string:
        ret

section '.data' data readable writeable

  buffer rb 1000h
  tmp dd ?

section '.idata' import data readable writeable

  dd 0,0,0,RVA kernel_name,RVA kernel_table
  dd 0,0,0,0,0

  kernel_table:
    ExitProcess dd RVA _ExitProcess
    GetCommandLineA dd RVA _GetCommandLineA
    GetEnvironmentVariableA dd RVA _GetEnvironmentVariableA
    GetStdHandle dd RVA _GetStdHandle
    WriteFile dd RVA _WriteFile
    dd 0

  kernel_name db 'KERNEL32.DLL',0

  _ExitProcess dw 0
    db 'ExitProcess',0
  _GetCommandLineA dw 0
    db 'GetCommandLineA',0
  _GetEnvironmentVariableA dw 0
    db 'GetEnvironmentVariableA',0
  _GetStdHandle dw 0
    db 'GetStdHandle',0
  _WriteFile dw 0
    db 'WriteFile',0

section '.reloc' fixups data readable discardable       ; needed for Win32s

It seems that HX implementation is case-sensitive, while DOS converts names to upper case:

Code:

C:\ASM\HXRT217\BIN>set include=C:\INCLUDE
C:\ASM\HXRT217\BIN>getenv include
C:\ASM\HXRT217\BIN>getenv INCLUDE
C:\INCLUDE