text: /*
   * Copyright (c) 2016-2022, OARC, Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. Neither the name of the copyright holder nor the names of its
   *    contributors may be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "config.h"
  
  #if defined(__FreeBSD__)
  #include <strings.h>
  #elif defined(__OpenBSD__)
  #include <string.h>
  #else
  #ifndef __STDC_WANT_LIB_EXT1__
  #define __STDC_WANT_LIB_EXT1__ 1
  #endif
  #include <string.h>
  #endif
  
  void dnscap_memzero(void* const pnt, const size_t len)
  {
  #if defined(__FreeBSD__) || defined(__OpenBSD__)
      explicit_bzero(pnt, len);
  #elif defined(__STDC_LIB_EXT1__)
      memset_s(pnt, 0, len);
  #else
      volatile unsigned char* volatile pnt_ = (volatile unsigned char* volatile)pnt;
      size_t i                              = (size_t)0U;
  
      while (i < len) {
          pnt_[i++] = 0U;
      }
  #endif
  }
  