misc/w32scomb.c

   1 /*
   2  * W32SCOMB
   3  * DLL for Win32s
   4  *
   5  * Copyright (c) 1997 Andreas Mohr
   6  */
   7
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include <stdlib.h>
  11 #include "wintypes.h"
  12 #include "wine/winbase16.h"
  13 #include "module.h"
  14 #include "ldt.h"
  15 #include "selectors.h"
  16 #include "heap.h"
  17
  18 /***********************************************************************
  19  *           Get16DLLAddress       (KERNEL32)
  20  *
  21  * This function is used by a Win32s DLL if it wants to call a Win16 function.
  22  * A 16:16 segmented pointer to the function is returned.
  23  * Written without any docu.
  24  */
  25 SEGPTR WINAPI Get16DLLAddress(HMODULE32 handle, LPSTR func_name) {
  26         HANDLE32 ThunkHeap = HeapCreate(HEAP_WINE_SEGPTR | HEAP_WINE_CODESEG, 0, 64);
  27         LPBYTE x;
  28         LPVOID tmpheap = HeapAlloc(ThunkHeap, 0, 32);
  29         SEGPTR thunk = HEAP_GetSegptr(ThunkHeap, 0, tmpheap);
  30         DWORD proc_16;
  31         WORD cs;
  32
  33         if (!handle) handle=GetModuleHandle16("WIN32S16");
  34         proc_16 = (DWORD)WIN32_GetProcAddress16(handle, func_name);
  35
  36         x=PTR_SEG_TO_LIN(thunk);
  37         *x++=0xba; *(DWORD*)x=proc_16;x+=4;             /* movl proc_16, $edx */
  38         *x++=0xea; *(DWORD*)x=(DWORD)GetProcAddress32(GetModuleHandle32A("KERNEL32"),"QT_Thunk");x+=4;     /* jmpl QT_Thunk */
  39         GET_CS(cs); *(WORD*)x=(WORD)cs;
  40         return thunk;
  41 }