xref: /dflybsd-src/test/stress/stress2/lib/random_int.c (revision 86d7f5d305c6adaa56ff4582ece9859d73106103)
186d7f5d3SJohn Marino /*-
286d7f5d3SJohn Marino  * Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
386d7f5d3SJohn Marino  * All rights reserved.
486d7f5d3SJohn Marino  *
586d7f5d3SJohn Marino  * Redistribution and use in source and binary forms, with or without
686d7f5d3SJohn Marino  * modification, are permitted provided that the following conditions
786d7f5d3SJohn Marino  * are met:
886d7f5d3SJohn Marino  * 1. Redistributions of source code must retain the above copyright
986d7f5d3SJohn Marino  *    notice, this list of conditions and the following disclaimer.
1086d7f5d3SJohn Marino  * 2. Redistributions in binary form must reproduce the above copyright
1186d7f5d3SJohn Marino  *    notice, this list of conditions and the following disclaimer in the
1286d7f5d3SJohn Marino  *    documentation and/or other materials provided with the distribution.
1386d7f5d3SJohn Marino  *
1486d7f5d3SJohn Marino  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
1586d7f5d3SJohn Marino  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1686d7f5d3SJohn Marino  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1786d7f5d3SJohn Marino  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
1886d7f5d3SJohn Marino  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1986d7f5d3SJohn Marino  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2086d7f5d3SJohn Marino  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2186d7f5d3SJohn Marino  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2286d7f5d3SJohn Marino  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2386d7f5d3SJohn Marino  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2486d7f5d3SJohn Marino  * SUCH DAMAGE.
2586d7f5d3SJohn Marino  *
2686d7f5d3SJohn Marino  */
2786d7f5d3SJohn Marino 
2886d7f5d3SJohn Marino #include <stdlib.h>
2986d7f5d3SJohn Marino 
3086d7f5d3SJohn Marino int
random_int(int mi,int ma)3186d7f5d3SJohn Marino random_int(int mi, int ma)
3286d7f5d3SJohn Marino {
3386d7f5d3SJohn Marino 	return (arc4random()  % (ma - mi + 1) + mi);
3486d7f5d3SJohn Marino }
3586d7f5d3SJohn Marino 
3686d7f5d3SJohn Marino #ifdef TEST
3786d7f5d3SJohn Marino #include <stdio.h>
3886d7f5d3SJohn Marino int
main()3986d7f5d3SJohn Marino main()
4086d7f5d3SJohn Marino {
4186d7f5d3SJohn Marino 	int i, j, min, max, r;
4286d7f5d3SJohn Marino 	min = 100;
4386d7f5d3SJohn Marino 	max = 1;
4486d7f5d3SJohn Marino 	for (i = 0; i < 10000; i++) {
4586d7f5d3SJohn Marino 		j += (r = random_int(1,100));
4686d7f5d3SJohn Marino 		if (max < r)
4786d7f5d3SJohn Marino 			max = r;
4886d7f5d3SJohn Marino 		if (min > r)
4986d7f5d3SJohn Marino 			min = r;
5086d7f5d3SJohn Marino 	}
5186d7f5d3SJohn Marino 	printf("Average is %d, min = %d, max = %d\n", j / 10000, min, max);
5286d7f5d3SJohn Marino 	return (0);
5386d7f5d3SJohn Marino }
5486d7f5d3SJohn Marino #endif
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