shithub: plan9front

ref: d2be4787c6e78df1a0fec1f6fdc75a616ecc1e1e
dir: /sys/src/libc/port/lnrand.c/

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

#define	MASK	0x7fffffffL

long
lnrand(long n)
{
	long slop, v;

	if(n < 0)
		return n;
	slop = MASK % n;
	do
		v = lrand();
	while(v <= slop);
	return v % n;
}