1 files changed, 40 insertions, 0 deletions
diff --git a/sgn.c b/sgn.c
new file mode 100644
index 000000000..1c7cdcea0
--- /dev/null
+++ b/sgn.c
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+/* mpfr_sgn -- Sign of a floating point number.
+
+Copyright 2003 Free Software Foundation.
+Contributed by the Spaces project, INRIA Lorraine.
+
+This file is part of the MPFR Library.
+
+The MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The MPFR Library 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "mpfr.h"
+#include "mpfr-impl.h"
+
+int
+mpfr_sgn (mpfr_srcptr a)
+{
+  if (MPFR_UNLIKELY( MPFR_IS_SINGULAR(a) ))
+    {
+      /* Only infinite is signed */
+      if (MPFR_IS_INF(a))
+	return MPFR_INT_SIGN(a);
+      else
+	return 0;
+    }
+  return MPFR_INT_SIGN(a);
+}