зеркало из https://github.com/github/ruby.git
70 строки
1.0 KiB
C
70 строки
1.0 KiB
C
/* public domain rewrite of isinf(3) */
|
|
|
|
#ifdef __osf__
|
|
|
|
#define _IEEE 1
|
|
#include <nan.h>
|
|
|
|
int
|
|
isinf(double n)
|
|
{
|
|
if (IsNANorINF(n) && IsINF(n)) {
|
|
return 1;
|
|
}
|
|
else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
#else
|
|
|
|
#include "ruby/3/config.h"
|
|
|
|
#if defined(HAVE_FINITE) && defined(HAVE_ISNAN)
|
|
|
|
#include <math.h>
|
|
#ifdef HAVE_IEEEFP_H
|
|
#include <ieeefp.h>
|
|
#endif
|
|
|
|
/*
|
|
* isinf may be provided only as a macro.
|
|
* ex. HP-UX, Solaris 10
|
|
* http://www.gnu.org/software/automake/manual/autoconf/Function-Portability.html
|
|
*/
|
|
#ifndef isinf
|
|
int
|
|
isinf(double n)
|
|
{
|
|
return (!finite(n) && !isnan(n));
|
|
}
|
|
#endif
|
|
|
|
#else
|
|
|
|
#ifdef HAVE_STRING_H
|
|
# include <string.h>
|
|
#else
|
|
# include <strings.h>
|
|
#endif
|
|
|
|
static double zero(void) { return 0.0; }
|
|
static double one (void) { return 1.0; }
|
|
static double inf (void) { return one() / zero(); }
|
|
|
|
int
|
|
isinf(double n)
|
|
{
|
|
static double pinf = 0.0;
|
|
static double ninf = 0.0;
|
|
|
|
if (pinf == 0.0) {
|
|
pinf = inf();
|
|
ninf = -pinf;
|
|
}
|
|
return memcmp(&n, &pinf, sizeof n) == 0
|
|
|| memcmp(&n, &ninf, sizeof n) == 0;
|
|
}
|
|
#endif
|
|
#endif
|