[Bug 4654] ebasePro 2.12 doesn't start properly--missing plugin

Wine Bugs wine-bugs at winehq.org
Mon May 28 19:42:22 CDT 2007


------- Additional Comments From focht at gmx.net  2007-28-05 19:42 -------

--- quote ---
I thought even Wine's declaration of $I10_OUTPUT may be wrong.
--- quote ---

Indeed, completely wrong ;-)
Following is the likely $I10_OUTPUT prototype and a working test case for you
(windows msvcrt.dll).
I had to trick M$ VC++ to accept 10-byte long double data (long double is always
mapped to 64 bit double).

--- snip sample code ---
#include <windows.h>
#include <stdio.h>

typedef struct _I10_DATA
  unsigned short decimal_point_pos; /* decimal-point position */
  char sign; /* sign indicator: "-", " " */
  unsigned char digits; /* number of digits returned (excluding NULL term) */
  char digit_buf[1]; /* storage to digits string (including NULL terminator) */
} I10_DATA, *PI10_DATA;

 10-byte long double is a IEEE754 extended precision float
 long double:


Where S=sign, E=exp, F=fractional part. 
The long double exponent is biased by 16383 and the doubles is biased by 1023. 

 * struct to fool the idiot compiler into not generating floating point
 * instructions when copying and pushing [long] double values
typedef struct
  unsigned char ldbl[10]; 

   "I10_OUTPUT" prototype
   LONGDOUBLE arg1 = long double value (10 bytes)
   long arg2 = number of desired digits
   long arg3 = flag? (0)
   PI10_DATA arg4 = pointer to result data

   returns: 1 if ok, 0 if NAN, INFINITY ...
typedef long (*PFN_I10_OUTPUT)(LONGDOUBLE, long, long, PI10_DATA);

int main(int argc, char* argv[])
   HMODULE hMod = LoadLibrary( "msvcrt.dll");
   PFN_I10_OUTPUT pfn = (PFN_I10_OUTPUT) GetProcAddress( hMod, "$I10_OUTPUT");

   int num_digits = 7;
   PI10_DATA buf = (PI10_STRUCT) HeapAlloc( GetProcessHeap(), 0,

   double dblNum = -12.3456789;
   _asm {
          fld dblNum;
          fstp TBYTE PTR [ld];

   long res = pfn( ld, num_digits, 0, buf);

   printf( "digits: %d, decimal point: %d, sign: '%c', digits: '%s'\n",
	   buf->digits,  buf->decimal_point_pos, buf->sign, buf->digit_buf);

   /* digits: 7, decimal point: 2, sign: '-', digits: '1234568' */

   HeapFree( GetProcessHeap(), 0, buf);
   FreeLibrary( hMod);

   return 0;
--- snip sample code ---

If you need more prototypes keep asking ... though that float stuff is not
really my preferred domain :-)


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