git: purgatorio

ref: 15b2a406cc0e11377cee12b5a112c003f7250a7f
dir: /libkern/floor.c/

View raw version 
#include <lib9.h>
/*
 * floor and ceil-- greatest integer <= arg
 * (resp least >=)
 */

double
floor(double d)
{
	double fract;

	if(d < 0) {
		fract = modf(-d, &d);
		if(fract != 0.0)
			d += 1;
		d = -d;
	} else
		modf(d, &d);
	return d;
}

double
ceil(double d)
{
	return -floor(-d);
}