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/*
C99 compatibility for SciPy
The Rules:
- Every function definition must have compiler guard so that it is not defined twice.
- This file should only affect compilers that do not support C99 natively.
- All functions should be defined as "static" to limit linker conflicts.
*/
#ifndef SCIPY_C99_COMPAT
#define SCIPY_C99_COMPAT
#include <float.h>
#if defined(_MSC_VER) && _MSC_VER <= 1600
/* MSVC 2008 and MSVC 2010 */
#ifndef isnan
#define isnan(x) _isnan((x))
#endif
#ifndef signbit
static int signbit(double x)
{
return x > 0;
}
#endif
#ifndef copysign
static double copysign(double x, double y)
{
if (x >= 0) {
if (y >= 0) {
return x;
}
else {
return -x;
}
}
else {
if (y >= 0) {
return -x;
}
else {
return x;
}
}
}
#endif
#ifndef fmax
static double fmax(double x, double y)
{
/* z > nan for z != nan is required by C the standard */
int xnan = isnan(x), ynan = isnan(y);
if (xnan || ynan)
{
if (xnan && !ynan)
return y;
if (!xnan && ynan)
return x;
return x;
}
/* +0 > -0 is preferred by C the standard */
if (x == 0 && y == 0)
{
int xs = signbit(x), ys = signbit(y);
if (xs && !ys)
return y;
if (!xs && ys)
return x;
return x;
}
if (x > y) {
return x;
}
else {
return y;
}
}
#endif
#ifndef fmin
static double fmin(double x, double y)
{
/* z > nan for z != nan is required by C the standard */
int xnan = isnan(x), ynan = isnan(y);
if (xnan || ynan)
{
if (xnan && !ynan)
return y;
if (!xnan && ynan)
return x;
return x;
}
/* +0 > -0 is preferred by C the standard */
if (x == 0 && y == 0)
{
int xs = signbit(x), ys = signbit(y);
if (xs && !ys)
return x;
if (!xs && ys)
return y;
return y;
}
if (x > y) {
return y;
}
else {
return x;
}
}
#endif
#endif
#if (__STDC_VERSION__ < 199901L)
/* Hopefully fail in less cases */
/* For compilers which aren't MSVC and haven't defined isnan */
#ifndef isnan
#define isnan(x) ((x) != (x))
#endif
#ifndef isfinite
#ifdef _MSC_VER
/* MSVC 2015 and newer still don't have everything */
#define isfinite(x) _finite((x))
#else
#define isfinite(x) !isnan((x) + (-x))
#endif
#endif
#ifndef isinf
#define isinf(x) (!isfinite(x) && !isnan(x))
#endif
#ifndef fma
#define fma(x, y, z) ((x)*(y) + (z))
#endif
#endif
/*
* portable isnan/isinf; in cmath only available in C++11 and npy_math
* versions don't work well (they get undef'd by cmath, see gh-5689)
* Implementation based on npy_math.h
*/
#ifndef sc_isnan
#define sc_isnan isnan
#endif
#ifndef sc_isinf
#define sc_isinf isinf
#endif
#ifndef sc_isfinite
#define sc_isfinite isfinite
#endif
#ifndef sc_fma
#define sc_fma fma
#endif
#endif
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