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/* public domain rewrite of isnan(3) */
#include "ruby/missing.h"
/*
* isnan() may be a macro, a function or both.
* (The C99 standard defines that isnan() is a macro, though.)
* http://www.gnu.org/software/automake/manual/autoconf/Function-Portability.html
*
* macro only: uClibc
* both: GNU libc
*
* This file is compile if no isnan() function is available.
* (autoconf AC_REPLACE_FUNCS detects only the function.)
* The macro is detected by following #ifndef.
*/
#ifndef isnan
static int double_ne(double n1, double n2);
int
isnan(double n)
{
return double_ne(n, n);
}
static int
double_ne(double n1, double n2)
{
return n1 != n2;
}
#endif
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