advapi32: Return required buffer size in RegLoadMUIString.

dlls/advapi32/registry.c

@@ -3112,7 +3112,7 @@ LSTATUS WINAPI RegOpenUserClassesRoot(
  * avoid importing user32, which is higher level than advapi32. Helper for
  * RegLoadMUIString.
  */
-static LONG load_string(HINSTANCE hModule, UINT resId, LPWSTR pwszBuffer, INT cMaxChars)
+static LONG load_string(HINSTANCE hModule, UINT resId, LPWSTR pwszBuffer, INT cMaxChars, UINT *reqChars)
 {
     HGLOBAL hMemory;
     HRSRC hResource;
@@ -3133,6 +3133,7 @@ static LONG load_string(HINSTANCE hModule, UINT resId, LPWSTR pwszBuffer, INT cM
     /* Strings are length-prefixed. Lowest nibble of resId is an index. */
     idxString = resId & 0xf;
     while (idxString--) pString += *pString + 1;
+    *reqChars = *pString + 1;
 
     /* If no buffer is given, return here. */
     if (!pwszBuffer) return ERROR_MORE_DATA;
@@ -3221,6 +3222,8 @@ LSTATUS WINAPI RegLoadMUIStringW(HKEY hKey, LPCWSTR pwszValue, LPWSTR pwszBuffer
     result = ERROR_SUCCESS;
     if (*pwszExpandedBuffer != '@') { /* '@' is the prefix for resource based string entries. */
         lstrcpynW(pwszBuffer, pwszExpandedBuffer, cbBuffer / sizeof(WCHAR));
+        if (pcbData)
+            *pcbData = (strlenW(pwszExpandedBuffer) + 1) * sizeof(WCHAR);
     } else {
         WCHAR *pComma = strrchrW(pwszExpandedBuffer, ','), *pNewBuffer;
         const WCHAR backslashW[] = {'\\',0};
@@ -3264,7 +3267,10 @@ LSTATUS WINAPI RegLoadMUIStringW(HKEY hKey, LPCWSTR pwszValue, LPWSTR pwszBuffer
         hModule = LoadLibraryExW(pwszTempBuffer, NULL,
                                  LOAD_LIBRARY_AS_DATAFILE | LOAD_LIBRARY_AS_IMAGE_RESOURCE);
         if (hModule) {
-            result = load_string(hModule, uiStringId, pwszBuffer, cbBuffer/sizeof(WCHAR));
+            DWORD reqChars;
+            result = load_string(hModule, uiStringId, pwszBuffer, cbBuffer/sizeof(WCHAR), &reqChars);
+            if (pcbData && (result == ERROR_SUCCESS || result == ERROR_MORE_DATA))
+                *pcbData = reqChars * sizeof(WCHAR);
             FreeLibrary(hModule);
         }
         else

dlls/advapi32/tests/registry.c

@@ -3892,7 +3892,7 @@ static void test_RegLoadMUIString(void)
     size = 0xdeadbeef;
     ret = pRegLoadMUIStringW(hkey, tz_valueW, NULL, 0, &size, 0, NULL);
     ok(ret == ERROR_MORE_DATA, "got %d, expected ERROR_MORE_DATA\n", ret);
-    todo_wine ok(size == text_size, "got %u, expected %u\n", size, text_size);
+    ok(size == text_size, "got %u, expected %u\n", size, text_size);
 
     memset(bufW, 0xff, sizeof(bufW));
     ret = pRegLoadMUIStringW(hkey, tz_valueW, bufW, sizeof(WCHAR)+1, &size, 0, NULL);
@@ -3903,7 +3903,7 @@ static void test_RegLoadMUIString(void)
     memset(bufW, 0xff, sizeof(bufW));
     ret = pRegLoadMUIStringW(hkey, tz_valueW, bufW, sizeof(WCHAR)*2, &size, 0, NULL);
     todo_wine ok(ret == ERROR_MORE_DATA, "got %d, expected ERROR_MORE_DATA\n", ret);
-    todo_wine ok(size == text_size || broken(size == text_size + sizeof(WCHAR) /* vista */),
+    ok(size == text_size || broken(size == text_size + sizeof(WCHAR) /* vista */),
        "got %u, expected %u\n", size, text_size);
     todo_wine ok(bufW[0] == 0xffff, "got 0x%04x, expected 0xffff\n", bufW[0]);
 
@@ -3911,9 +3911,8 @@ static void test_RegLoadMUIString(void)
     memset(bufW, 0xff, sizeof(bufW));
     ret = pRegLoadMUIStringW(hkey, tz_valueW, bufW, ARRAY_SIZE(bufW), &size, 0, NULL);
     ok(ret == ERROR_SUCCESS, "got %d, expected ERROR_SUCCESS\n", ret);
-    todo_wine ok(size == text_size, "got %u, expected %u\n", size, text_size);
-    size = min(size, sizeof(bufW));
-    todo_wine ok(!memcmp(textW, bufW, size), "got %s, expected %s\n",
+    ok(size == text_size, "got %u, expected %u\n", size, text_size);
+    ok(!memcmp(textW, bufW, size), "got %s, expected %s\n",
        wine_dbgstr_wn(bufW, size / sizeof(WCHAR)), wine_dbgstr_wn(textW, text_size / sizeof(WCHAR)));
 
     ret = pRegLoadMUIStringA(hkey, tz_value, buf, ARRAY_SIZE(buf), &size, 0, NULL);
@@ -3926,9 +3925,8 @@ static void test_RegLoadMUIString(void)
     memset(bufW, 0xff, sizeof(bufW));
     ret = pRegLoadMUIStringW(hkey, tz_valueW, bufW, ARRAY_SIZE(bufW), &size, 0, sysdirW);
     ok(ret == ERROR_SUCCESS, "got %d, expected ERROR_SUCCESS\n", ret);
-    todo_wine ok(size == text_size, "got %u, expected %u\n", size, text_size);
-    size = min(size, sizeof(bufW));
-    todo_wine ok(!memcmp(textW, bufW, size), "got %s, expected %s\n",
+    ok(size == text_size, "got %u, expected %u\n", size, text_size);
+    ok(!memcmp(textW, bufW, size), "got %s, expected %s\n",
        wine_dbgstr_wn(bufW, size / sizeof(WCHAR)), wine_dbgstr_wn(textW, text_size / sizeof(WCHAR)));
 
     ret = pRegLoadMUIStringA(hkey, tz_value, buf, ARRAY_SIZE(buf), &size, 0, sysdir);