shlwapi: Fix wnsprintfA/wvnsprintfA %S conversion.

dlls/shlwapi/wsprintf.c

@@ -245,7 +245,7 @@ static INT WPRINTF_ParseFormatW( LPCWSTR format, WPRINTF_FORMAT *res )
  *           WPRINTF_GetLen
  */
 static UINT WPRINTF_GetLen( WPRINTF_FORMAT *format, WPRINTF_DATA *arg,
-                              LPSTR number, UINT maxlen )
+                            LPSTR number, UINT maxlen, BOOL dst_is_wide )
 {
     UINT len;
 
@@ -264,8 +264,18 @@ static UINT WPRINTF_GetLen( WPRINTF_FORMAT *format, WPRINTF_DATA *arg,
         return (format->precision = len);
     case WPR_WSTRING:
         if (!arg->lpcwstr_view) arg->lpcwstr_view = null_stringW;
-        for (len = 0; !format->precision || (len < format->precision); len++)
-            if (!*(arg->lpcwstr_view + len)) break;
+        if (dst_is_wide)
+        {
+            for (len = 0; !format->precision || (len < format->precision); len++)
+                if (!*(arg->lpcwstr_view + len)) break;
+        }
+        else
+        {
+            LPCWSTR p = arg->lpcwstr_view;
+            for (len = 0; (!format->precision || len < format->precision) && *p; p++)
+                len += WideCharToMultiByte( CP_ACP, 0, p, 1, NULL, 0, NULL, NULL );
+            if (format->precision && len > format->precision) len = format->precision;
+        }
         if (len > maxlen) len = maxlen;
         return (format->precision = len);
     case WPR_SIGNED:
@@ -365,7 +375,7 @@ INT WINAPI wvnsprintfA( LPSTR buffer, INT maxlen, LPCSTR spec, __ms_va_list args
             break;
         }
 
-        len = WPRINTF_GetLen( &format, &argData, number, maxlen - 1 );
+        len = WPRINTF_GetLen( &format, &argData, number, maxlen - 1, FALSE );
         sign = 0;
         if (!(format.flags & WPRINTF_LEFTALIGN))
             for (i = format.precision; i < format.width; i++, maxlen--)
@@ -385,7 +395,15 @@ INT WINAPI wvnsprintfA( LPSTR buffer, INT maxlen, LPCSTR spec, __ms_va_list args
         case WPR_WSTRING:
             {
                 LPCWSTR ptr = argData.lpcwstr_view;
-                for (i = 0; i < len; i++) *p++ = (CHAR)*ptr++;
+                for (i = 0; i < len; ptr++)
+                {
+                    CHAR mb[5]; /* 5 is MB_LEN_MAX */
+                    int ret = WideCharToMultiByte( CP_ACP, 0, ptr, 1, mb, sizeof(mb), NULL, NULL );
+                    i += ret;
+                    if (i > len) ret = len - (p - buffer);
+                    memcpy( p, mb, ret );
+                    p += ret;
+                }
             }
             break;
         case WPR_HEXA:
@@ -472,7 +490,7 @@ INT WINAPI wvnsprintfW( LPWSTR buffer, INT maxlen, LPCWSTR spec, __ms_va_list ar
             break;
         }
 
-        len = WPRINTF_GetLen( &format, &argData, number, maxlen - 1 );
+        len = WPRINTF_GetLen( &format, &argData, number, maxlen - 1, TRUE );
         sign = 0;
         if (!(format.flags & WPRINTF_LEFTALIGN))
             for (i = format.precision; i < format.width; i++, maxlen--)