git: 9front

ref: c4a1c232c2d7af3fff0783f3947635faa9081168
dir: /sys/src/libc/port/nrand.c/

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#include	<u.h>
#include	<libc.h>

#define	MASK	0x7fffffffL

int
nrand(int n)
{
	long slop, v;

	if(n < 0)
		return n;
	if(n == 1)
		return 0;
	/* and if n == 0, you deserve what you get */
	slop = MASK % n;
	do
		v = lrand();
	while(v <= slop);
	return v % n;
}