/*
 * Copyright (C) 2022 - 2026, Stephan Mueller <smueller@chronox.de>
 *
 * License: see LICENSE file in root directory
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
 * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR 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 NOT ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 */

#ifndef GETRANDOM_H
#define GETRANDOM_H

#include <errno.h>
#include <limits.h>
#include <stdint.h>
#include <sys/random.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef GRND_SEED
#define GRND_SEED 0x0010
#endif
#ifndef GRND_FULLY_SEEDED
#define GRND_FULLY_SEEDED 0x0020
#endif

static inline ssize_t __getrandom(uint8_t *buffer, size_t bufferlen,
				  unsigned int flags)
{
	return getrandom(buffer, bufferlen, flags);
}

static inline ssize_t getrandom_urandom(uint8_t *buffer, size_t bufferlen)
{
	return __getrandom(buffer, bufferlen, 0);
}

static inline ssize_t getrandom_random(uint8_t *buffer, size_t bufferlen)
{
	return __getrandom(buffer, bufferlen, GRND_RANDOM);
}

static inline ssize_t getrandom_seed_initial(uint8_t *buffer, size_t bufferlen)
{
	return __getrandom(buffer, bufferlen, GRND_SEED);
}

static inline ssize_t getrandom_seed(uint8_t *buffer, size_t bufferlen)
{
	return __getrandom(buffer, bufferlen, GRND_SEED | GRND_FULLY_SEEDED);
}

#ifdef __cplusplus
}
#endif

#endif /* GETRANDOM_H */
