util.c

/*
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *
 * An earlier version of this file was originally released into the public
 * domain by its authors. It has been modified to make the code compile and
 * link as part of the Google Authenticator project. These changes are
 * copyrighted by Google Inc. and released under the Apache License,
 * Version 2.0.
 *
 * The previous authors' terms are included below:
 */

/*****************************************************************************
 *
 * File:    util.c
 *
 * Purpose: Collection of cross file utility functions.
 *
 * This code is in the public domain
 *
 *****************************************************************************
 */

#ifndef HAVE_EXPLICIT_BZERO
#include <string.h>

void explicit_bzero(void *s, size_t len) {
  memset(s, '\0', len);
  asm volatile("" ::: "memory");
}
#endif