ntdll: Unify the checks for asynchronous NtReadFile behaviour.

dlls/ntdll/file.c

@@ -587,7 +587,7 @@ NTSTATUS WINAPI NtReadFile(HANDLE hFile, HANDLE hEvent,
     ULONG total = 0;
     enum server_fd_type type;
     ULONG_PTR cvalue = apc ? 0 : (ULONG_PTR)apc_user;
-    BOOL send_completion = FALSE;
+    BOOL send_completion = FALSE, async_read;
 
     TRACE("(%p,%p,%p,%p,%p,%p,0x%08x,%p,%p),partial stub!\n",
           hFile,hEvent,apc,apc_user,io_status,buffer,length,offset,key);
@@ -604,9 +604,11 @@ NTSTATUS WINAPI NtReadFile(HANDLE hFile, HANDLE hEvent,
         goto done;
     }
 
+    async_read = !(options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
+
     if (type == FD_TYPE_FILE)
     {
-        if (!(options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT)) && (!offset || offset->QuadPart < 0))
+        if (async_read && (!offset || offset->QuadPart < 0))
         {
             status = STATUS_INVALID_PARAMETER;
             goto done;
@@ -623,7 +625,7 @@ NTSTATUS WINAPI NtReadFile(HANDLE hFile, HANDLE hEvent,
                     goto done;
                 }
             }
-            if (options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT))
+            if (!async_read)
                 /* update file pointer position */
                 lseek( unix_handle, offset->QuadPart + result, SEEK_SET );
 
@@ -634,7 +636,7 @@ NTSTATUS WINAPI NtReadFile(HANDLE hFile, HANDLE hEvent,
     }
     else if (type == FD_TYPE_SERIAL)
     {
-        if (!(options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT)) && (!offset || offset->QuadPart < 0))
+        if (async_read && (!offset || offset->QuadPart < 0))
         {
             status = STATUS_INVALID_PARAMETER;
             goto done;
@@ -675,7 +677,7 @@ NTSTATUS WINAPI NtReadFile(HANDLE hFile, HANDLE hEvent,
             goto done;
         }
 
-        if (!(options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT)))
+        if (async_read)
         {
             async_fileio_read *fileio;
             BOOL avail_mode;