minix/lib/gnu/ieee_float/isinf.c

31 lines
542 B
C

/*
libc/ieee_float/isinf.c
Created: Oct 14, 1993 by Philip Homburg <philip@cs.vu.nl>
Implementation of isinf that directly tests the bits in an ieee float
*/
#define _MINIX_SOURCE
#include <sys/types.h>
#include <math.h>
#include "ieee_float.h"
int isinf(value)
double value;
{
struct f64 *f64p;
int exp;
f64p= (struct f64 *)&value;
exp= F64_GET_EXP(f64p);
if (exp != F64_EXP_MAX)
return 0;
return F64_GET_MANT_LOW(f64p) == 0 && F64_GET_MANT_HIGH(f64p) == 0;
}
/*
* $PchId: isinf.c,v 1.3 1996/02/22 21:01:39 philip Exp $
*/