André Hentschel : oleaut32: Fix rounding.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 77acdcc016cd8954b07bbed1dca337323d368097
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=77acdcc016cd8954b07bbed1dc...

Author: André Hentschel 
Date:   Sun Feb 21 19:46:38 2010 +0100

oleaut32: Fix rounding.

---

dlls/oleaut32/tests/varformat.c |   10 ++++++++--
 dlls/oleaut32/varformat.c       |   11 ++++++++++-
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/dlls/oleaut32/tests/varformat.c b/dlls/oleaut32/tests/varformat.c
index 9d15fd9..d0975ed 100644
--- a/dlls/oleaut32/tests/varformat.c
+++ b/dlls/oleaut32/tests/varformat.c
@@ -381,8 +381,14 @@ static void test_VarFormat(void)
   VARFMT(VT_R8,V_R8,-0.1,".#",S_OK,"-.1");
   VARFMT(VT_R8,V_R8,0.099,"#.#",S_OK,".1");
   VARFMT(VT_R8,V_R8,0.0999,"#.##",S_OK,".1");
-  /* for large negative exponents, wine truncates instead of rounding */
-  todo_wine VARFMT(VT_R8,V_R8,0.099,"#.##",S_OK,".1");
+  VARFMT(VT_R8,V_R8,0.099,"#.##",S_OK,".1");
+  VARFMT(VT_R8,V_R8,0.0099,"#.##",S_OK,".01");
+  VARFMT(VT_R8,V_R8,0.0049,"#.##",S_OK,".");
+  VARFMT(VT_R8,V_R8,0.0094,"#.##",S_OK,".01");
+  VARFMT(VT_R8,V_R8,0.00099,"#.##",S_OK,".");
+  VARFMT(VT_R8,V_R8,0.0995,"#.##",S_OK,".1");
+  VARFMT(VT_R8,V_R8,8.0995,"#.##",S_OK,"8.1");
+  VARFMT(VT_R8,V_R8,0.0994,"#.##",S_OK,".1");

/* 'out' is not cleared */
diff --git a/dlls/oleaut32/varformat.c b/dlls/oleaut32/varformat.c
index f6c142d..370b4f0 100644
--- a/dlls/oleaut32/varformat.c
+++ b/dlls/oleaut32/varformat.c
@@ -1285,12 +1285,21 @@ static HRESULT VARIANT_FormatNumber(LPVARIANT pVarIn, LPOLESTR lpszFormat,
         have_frac = -pad;
         pad = 0;
       }
+      if(exponent < 0 && exponent > (-256 + have_int + have_frac))
+      {
+        /* Remove exponent notation */
+        memmove(rgbDig - exponent, rgbDig, have_int + have_frac);
+        ZeroMemory(rgbDig, -exponent);
+        have_frac -= exponent;
+        exponent = 0;
+      }
     }

/* Rounding the number */
     if (have_frac > need_frac)
     {
-      prgbDig = &rgbDig[have_int + need_frac];
+      prgbDig = &rgbDig[have_int + need_frac ? need_frac + 1 : 0];
+      if (*prgbDig < 5) prgbDig--;
       have_frac = need_frac;
       if (*prgbDig >= 5)
       {