/******************************************************************************
 *
 * Copyright 2017 Xaptum, 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
 *
 *****************************************************************************/

#include "explicit_bzero.h"

#ifdef _WIN32
#include <windows.h>
#elif defined(HAVE_MEMSET_S)
#include <string.h>
#include <stdlib.h>
#endif

void explicit_bzero(void *const pnt, const size_t len)
{
#ifdef _WIN32
    SecureZeroMemory(pnt, len);
#elif defined(HAVE_MEMSET_S)
    if (len > 0U && memset_s(pnt, (rsize_t) len, 0, (rsize_t) len) != 0) {
        abort();
    }
#elif defined(HAVE_EXPLICIT_BZERO)
    explicit_bzero(pnt, 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
}