1 files changed, 102 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/general/gr_math.cc b/gnuradio-core/src/lib/general/gr_math.cc
new file mode 100644
index 000000000..e2e7249e2
--- /dev/null
+++ b/gnuradio-core/src/lib/general/gr_math.cc
@@ -0,0 +1,102 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2003 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <gr_math.h>
+#include <math.h>
+
+/*
+ * Greatest Common Divisor, using Euclid's algorithm.
+ * [There are faster algorithms.  See Knuth 4.5.2 if you care]
+ */
+
+long
+gr_gcd (long m, long n)
+{
+  if (m < 0)
+    m = -m;
+  
+  if (n < 0)
+    n = -n;
+
+  while (n != 0){
+    long	t = m % n;
+    m = n;
+    n = t;
+  }
+
+  return m;
+}
+
+
+/*
+ * These really need some configure hacking to figure out the right answer.
+ * As a stop gap, try for a macro, and if not that, then try std::
+ */
+
+// returns a non-zero value if value is "not-a-number" (NaN), and 0 otherwise
+
+#if defined(isnan) || !defined(CXX_HAS_STD_ISNAN)
+
+int 
+gr_isnan (double value)
+{
+  return isnan (value);
+}
+
+#else
+
+int 
+gr_isnan (double value)
+{
+  return std::isnan (value);
+}
+
+#endif
+
+// returns a non-zero value if the value of x has its sign bit set.
+//
+// This  is  not  the  same  as `x < 0.0', because IEEE 754 floating point
+// allows zero to be signed.  The comparison `-0.0 < 0.0'  is  false,  but
+// `gr_signbit (-0.0)' will return a nonzero value.
+
+#ifdef signbit
+
+int 
+gr_signbit (double x)
+{
+  return signbit (x);
+}
+
+#else
+
+int 
+gr_signbit (double x)
+{
+  return std::signbit (x);
+}
+
+
+#endif