1 files changed, 147 insertions, 0 deletions
diff --git a/gsl-1.9/sys/infnan.c b/gsl-1.9/sys/infnan.c
new file mode 100644
index 0000000..fc38404
--- /dev/null
+++ b/gsl-1.9/sys/infnan.c
@@ -0,0 +1,147 @@
+/* sys/infnan.c
+ * 
+ * Copyright (C) 2001, 2004 Brian Gough
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <config.h>
+#include <math.h>
+
+#if HAVE_IEEEFP_H
+#include <ieeefp.h>
+#endif
+
+double gsl_nan (void);
+double gsl_posinf (void);
+double gsl_neginf (void);
+double gsl_fdiv (const double x, const double y);
+
+double gsl_nan (void)
+{
+  return gsl_fdiv (0.0, 0.0);
+}
+
+double gsl_posinf (void)
+{
+  return gsl_fdiv (+1.0, 0.0);
+}
+
+double gsl_neginf (void)
+{
+  return gsl_fdiv (-1.0, 0.0);
+}
+
+
+int gsl_isnan (const double x);
+int gsl_isinf (const double x);
+int gsl_finite (const double x);
+
+#if defined(_MSC_VER) /* Microsoft Visual C++ */
+#include <float.h>
+int
+gsl_isnan (const double x)
+{
+  return _isnan(x);
+}
+
+int
+gsl_isinf (const double x)
+{
+  int fpc = _fpclass(x);
+
+  if (fpc == _FPCLASS_PINF)
+    return +1;
+  else if (fpc == _FPCLASS_NINF)
+    return -1;
+  else 
+    return 0;
+}
+
+int
+gsl_finite (const double x)
+{
+  return _finite(x);
+}
+#elif HAVE_IEEE_COMPARISONS
+int
+gsl_isnan (const double x)
+{
+  int status = (x != x);
+  return status;
+}
+
+int
+gsl_isinf (const double x)
+{
+  double y = x - x;
+  int s = (y != y);
+
+  if (s && x > 0)
+    return +1;
+  else if (s && x < 0)
+    return -1;
+  else
+    return 0;
+}
+
+int
+gsl_finite (const double x)
+{
+  const double y = x - x;
+  int status = (y == y);
+  return status;
+}
+#else
+
+#if HAVE_DECL_ISNAN
+int
+gsl_isnan (const double x)
+{
+  return isnan(x);
+}
+#endif
+
+#if HAVE_DECL_ISINF
+int
+gsl_isinf (const double x)
+{
+    return isinf(x);
+}
+#else
+int
+gsl_isinf (const double x)
+{
+    return (! gsl_finite(x)) && (! gsl_isnan(x));
+}
+#endif
+
+
+#if HAVE_DECL_FINITE
+int
+gsl_finite (const double x)
+{
+  return finite(x);
+}
+#elif HAVE_DECL_ISFINITE
+int
+gsl_finite (const double x)
+{
+  return isfinite(x);
+}
+#endif
+
+#endif
+