msvcrt: Add support for _flushall to clear all input buffer.

dlls/msvcrt/file.c

@@ -780,7 +780,7 @@ static int msvcrt_flush_all_buffers(int mask)
  */
 int CDECL MSVCRT__flushall(void)
 {
-    return msvcrt_flush_all_buffers(MSVCRT__IOWRT);
+    return msvcrt_flush_all_buffers(MSVCRT__IOWRT | MSVCRT__IOREAD);
 }
 
 /*********************************************************************
@@ -789,7 +789,7 @@ int CDECL MSVCRT__flushall(void)
 int CDECL MSVCRT_fflush(MSVCRT_FILE* file)
 {
     if(!file) {
-        MSVCRT__flushall();
+        msvcrt_flush_all_buffers(MSVCRT__IOWRT);
     } else if(file->_flag & MSVCRT__IOWRT) {
         int res;
 

dlls/msvcrt/tests/file.c

@@ -635,7 +635,7 @@ static void test_fflush( void )
   ok(ret >= 0, "unexpected ret %d\n", ret);
   memset(buf2, '?', sizeof(buf2));
   fread(buf2, 1, sizeof(buf2), tempfh);
-  todo_wine ok(memcmp(buf1, buf2, sizeof(buf1)) == 0, "Got unexpected data (%c)\n", buf2[0]);
+  ok(memcmp(buf1, buf2, sizeof(buf1)) == 0, "Got unexpected data (%c)\n", buf2[0]);
 
   fclose(tempfh);