git: 9front

ref: 1d563ec8e9a5a485597a9f9c24d1f5a698f2c8a3
dir: /sys/src/libc/port/lnrand.c/

View raw version 
#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;
}