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math-compat.h: add implementation for isnan() for Visual C++

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Visual C++ does not have isnan(), so add fallback to
math-compat.h (could use _isnan() in this case, but
this makes it work for all cases where isnan is missing).

https://bugzilla.gnome.org/show_bug.cgi?id=679112
This commit is contained in:
Chun-wei Fan 2012-06-29 16:52:31 +08:00 committed by Tim-Philipp Müller
parent cb5e8f2bb4
commit 02c07aa854
1 changed files with 13 additions and 0 deletions
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13
gst/math-compat.h
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@ -36,15 +36,18 @@ G_BEGIN_DECLS
#define __GST_MATH_COMPAT_NEED_RINT
#define __GST_MATH_COMPAT_NEED_RINTF
#define __GST_MATH_COMPAT_NEED_ISNAN
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#undef __GST_MATH_COMPAT_NEED_RINT
#undef __GST_MATH_COMPAT_NEED_RINTF
#undef __GST_MATH_COMPAT_NEED_ISNAN
#endif
#if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L
#undef __GST_MATH_COMPAT_NEED_RINT
#undef __GST_MATH_COMPAT_NEED_RINTF
#undef __GST_MATH_COMPAT_NEED_ISNAN
#endif
#ifndef M_PI
@ -71,6 +74,12 @@ __gst_math_compat_rintf (float x)
return floorf (x + 0.5);
}
static inline gboolean
__gst_math_compat_isnan (double x)
{
return x != x;
}
#if defined (__GST_MATH_COMPAT_NEED_RINT) && !defined (rint)
#define rint(x) __gst_math_compat_rint(x)
#endif
@ -79,6 +88,10 @@ __gst_math_compat_rintf (float x)
#define rintf(x) __gst_math_compat_rintf(x)
#endif
#if defined (__GST_MATH_COMPAT_NEED_ISNAN) && !defined (isnan)
#define isnan(x) __gst_math_compat_isnan (x)
#endif
#ifndef NAN
#if G_BYTE_ORDER == G_BIG_ENDIAN
#define __GST_NAN_BYTES { 0x7f, 0xc0, 0, 0 }