shithub: drawterm-fdroid

ref: 0818148b0432a1b11d2feb72cca47156a603e884
dir: drawterm-fdroid/libc/frand.c

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

#define	MASK	0x7fffffffL
#define	NORM	(1.0/(1.0+MASK))

double
frand(void)
{
	double x;

	do {
		x = lrand() * NORM;
		x = (x + lrand()) * NORM;
	} while(x >= 1);
	return x;
}