/*

                            __  __            _

                         ___\ \/ /_ __   __ _| |_

                        / _ \\  /| '_ \ / _` | __|

                       |  __//  \| |_) | (_| | |_

                        \___/_/\_\ .__/ \__,_|\__|

                                 |_| XML parser

   Copyright (c) 2026 Sebastian Pipping <sebastian@pipping.org>

   Copyright (c) 2026 Matthew Fernandez <matthew.fernandez@gmail.com>

   Licensed under the MIT license:

   Permission is  hereby granted,  free of charge,  to any  person obtaining

   a  copy  of  this  software   and  associated  documentation  files  (the

   "Software"),  to  deal in  the  Software  without restriction,  including

   without  limitation the  rights  to use,  copy,  modify, merge,  publish,

   distribute, sublicense, and/or sell copies of the Software, and to permit

   persons  to whom  the Software  is  furnished to  do so,  subject to  the

   following conditions:

   The above copyright  notice and this permission notice  shall be included

   in all copies or substantial portions of the Software.

   THE  SOFTWARE  IS  PROVIDED  "AS  IS",  WITHOUT  WARRANTY  OF  ANY  KIND,

   EXPRESS  OR IMPLIED,  INCLUDING  BUT  NOT LIMITED  TO  THE WARRANTIES  OF

   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

   NO EVENT SHALL THE AUTHORS OR  COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

   DAMAGES OR  OTHER LIABILITY, WHETHER  IN AN  ACTION OF CONTRACT,  TORT OR

   OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

   USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

#include "random_getentropy.h"

// NOTE: Please keep this block in sync with its two siblings in files

//       `configure.ac` and `ConfigureChecks.cmake`!

#if defined(__APPLE__)

#  include <sys/random.h>

#else

#  if defined(__GLIBC__) && ! defined(_DEFAULT_SOURCE)

#    define _DEFAULT_SOURCE 1

#  endif

#  if ! defined(_GNU_SOURCE)

#    define _GNU_SOURCE 1 /* for musl */

#  endif

#  include <unistd.h>

#endif // ! defined(__APPLE__)

#include "memory_sanitizer.h"

#include <errno.h>

bool

writeRandomBytes_getentropy(void *target, size_t count) {

  errno = 0;

  const bool success = getentropy(target, count);

  // MSan does not understand `getentropy`, so explain its effects

  if (success)

    MSAN_UNPOISON(target, count);

  return success;

}