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Editing: random.h

/*
 * util/random.h - thread safe random generator, which is reasonably secure.
 * 
 * Copyright (c) 2007, NLnet Labs. All rights reserved.
 * 
 * This software is open source.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * 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.
 * 
 * Neither the name of the NLNET LABS 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.
 */

#ifndef UTIL_RANDOM_H
#define UTIL_RANDOM_H

/**
 * \file
 * Thread safe random functions. Similar to arc4random() with an explicit
 * initialisation routine.
 */

/**
 * random state structure.
 */
struct ub_randstate;

/**
 * Initialize a random generator state for use 
 * @param from: if not NULL, the seed is taken from this random structure.
 * 	can be used to seed random states via a parent-random-state that
 * 	is itself seeded with entropy.
 * @return new state or NULL alloc failure.
 */
struct ub_randstate* ub_initstate(struct ub_randstate* from);

/**
 * Generate next random number from the state passed along.
 * Thread safe, so random numbers are repeatable.
 * @param state: must have been initialised with ub_initstate.
 * @return: random 31 bit value.
 */
long int ub_random(struct ub_randstate* state);

/**
 * Generate random number between 0 and x-1.  No modulo bias.
 * @param state: must have been initialised with ub_initstate.
 * @param x: an upper limit. not (negative or zero). must be smaller than 2**31.
 * @return: random value between 0..x-1. Possibly more than one
 * random number is picked from the random stream to satisfy this.
 */
long int ub_random_max(struct ub_randstate* state, long int x);

/**
 * Delete the random state.
 * @param state: to delete.
 */
void ub_randfree(struct ub_randstate* state);

#endif /* UTIL_RANDOM_H */

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