[PATCH v2 1/2] propsys: Implement VariantToStringWithDefault.

[Mohamad Al-Jaf]

Signed-off-by: Mohamad Al-Jaf <mohamadaljaf at gmail.com>
---
v2: - Support byref BSTR.
    - Support nested VARIANT including byref BSTR.
---
 dlls/propsys/propsys.spec |  2 +-
 dlls/propsys/propvar.c    | 46 +++++++++++++++++++++++++++++++++++++++
 include/propvarutil.h     |  6 +++++
 3 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/dlls/propsys/propsys.spec b/dlls/propsys/propsys.spec
index 15749952e95..7391cf4aaa2 100644
--- a/dlls/propsys/propsys.spec
+++ b/dlls/propsys/propsys.spec
@@ -194,7 +194,7 @@
 @ stub VariantToStringAlloc
 @ stub VariantToStringArray
 @ stub VariantToStringArrayAlloc
-@ stub VariantToStringWithDefault
+@ stdcall VariantToStringWithDefault(ptr wstr)
 @ stub VariantToUInt16
 @ stub VariantToUInt16Array
 @ stub VariantToUInt16ArrayAlloc
diff --git a/dlls/propsys/propvar.c b/dlls/propsys/propvar.c
index 8f6c52f7aa7..09f9a8aa892 100644
--- a/dlls/propsys/propvar.c
+++ b/dlls/propsys/propvar.c
@@ -416,6 +416,52 @@ PCWSTR WINAPI PropVariantToStringWithDefault(REFPROPVARIANT propvarIn, LPCWSTR p
     return pszDefault;
 }
 
+/******************************************************************
+ *  VariantToStringWithDefault   (PROPSYS.@)
+ */
+PCWSTR WINAPI VariantToStringWithDefault(const VARIANT *pvar, LPCWSTR pszDefault)
+{
+    TRACE("(%p, %s)\n", pvar, debugstr_w(pszDefault));
+
+    switch(V_VT(pvar))
+    {
+        case VT_BSTR:
+        {
+            if (V_BSTR(pvar) == NULL)
+                return L"";
+
+            return V_BSTR(pvar);
+        }
+        case VT_BYREF | VT_BSTR:
+        {
+            if (*V_BSTRREF(pvar) == NULL)
+                return L"";
+
+            return *V_BSTRREF(pvar);
+        }
+        case VT_BYREF | VT_VARIANT:
+        {
+            if (V_VT(V_VARIANTREF(pvar)) == VT_BSTR)
+            {
+                if (V_BSTR(V_VARIANTREF(pvar)) == NULL)
+                    return L"";
+
+                return V_BSTR(V_VARIANTREF(pvar));
+            }
+
+            if (V_VT(V_VARIANTREF(pvar)) == (VT_BYREF | VT_BSTR))
+            {
+                if (*V_BSTRREF(V_VARIANTREF(pvar)) == NULL)
+                    return L"";
+
+                return *V_BSTRREF(V_VARIANTREF(pvar));
+            }
+        }
+    }
+
+    return pszDefault;
+}
+
 
 /******************************************************************
  *  PropVariantChangeType   (PROPSYS.@)
diff --git a/include/propvarutil.h b/include/propvarutil.h
index 36a670f56e6..2515d71b3b6 100644
--- a/include/propvarutil.h
+++ b/include/propvarutil.h
@@ -93,6 +93,7 @@ HRESULT WINAPI PropVariantToBoolean(REFPROPVARIANT propvarIn, BOOL *ret);
 HRESULT WINAPI PropVariantToBuffer(REFPROPVARIANT propvarIn, void *ret, UINT cb);
 HRESULT WINAPI PropVariantToString(REFPROPVARIANT propvarIn, PWSTR ret, UINT cch);
 PCWSTR WINAPI PropVariantToStringWithDefault(REFPROPVARIANT propvarIn, LPCWSTR pszDefault);
+PCWSTR WINAPI VariantToStringWithDefault(const VARIANT *pvar, LPCWSTR pszDefault);
 
 HRESULT WINAPI PropVariantToStringAlloc(REFPROPVARIANT propvarIn, WCHAR **ret);
 
@@ -201,6 +202,11 @@ inline BOOL IsPropVariantString(REFPROPVARIANT propvar)
     return (PropVariantToStringWithDefault(propvar, NULL) != NULL);
 }
 
+inline BOOL IsVariantString(const VARIANT *pvar)
+{
+    return (VariantToStringWithDefault(pvar, NULL) != NULL);
+}
+
 #endif /* NO_PROPVAR_INLINES */
 #endif /* __cplusplus */
 
-- 
2.35.1