1 files changed, 131 insertions, 0 deletions
diff --git a/mpfr/tests/tsgn.c b/mpfr/tests/tsgn.c
new file mode 100644
index 0000000000..b7d208b57b
--- /dev/null
+++ b/mpfr/tests/tsgn.c
@@ -0,0 +1,131 @@
+/* tsgn -- Test for the sign of a floating point number.
+
+Copyright 2003, 2006-2016 Free Software Foundation, Inc.
+Contributed by the AriC and Caramba projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU 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 3 of the License, or (at your
+option) any later version.
+
+The GNU 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 GNU MPFR Library; see the file COPYING.LESSER.  If not, see
+http://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
+51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mpfr-test.h"
+
+static void
+check_special (void)
+{
+  mpfr_t x;
+  int ret = 0;
+
+  mpfr_init (x);
+  MPFR_SET_ZERO (x);
+  if ((mpfr_sgn) (x) != 0 || mpfr_sgn (x) != 0)
+    {
+      printf("Sgn error for 0.\n");
+      ret = 1;
+    }
+  MPFR_SET_INF (x);
+  MPFR_SET_POS (x);
+  if ((mpfr_sgn) (x) != 1 || mpfr_sgn (x) != 1)
+    {
+      printf("Sgn error for +Inf.\n");
+      ret = 1;
+    }
+  MPFR_SET_INF (x);
+  MPFR_SET_NEG (x);
+  if ((mpfr_sgn) (x) != -1 || mpfr_sgn (x) != -1)
+    {
+      printf("Sgn error for -Inf.\n");
+      ret = 1;
+    }
+  MPFR_SET_NAN (x);
+  mpfr_clear_flags ();
+  if ((mpfr_sgn) (x) != 0 || !mpfr_erangeflag_p ())
+    {
+      printf("Sgn error for NaN.\n");
+      ret = 1;
+    }
+  mpfr_clear_flags ();
+  if (mpfr_sgn (x) != 0 || !mpfr_erangeflag_p ())
+    {
+      printf("Sgn error for NaN.\n");
+      ret = 1;
+    }
+  mpfr_clear (x);
+  if (ret)
+    exit (ret);
+}
+
+static void
+check_sgn(void)
+{
+  mpfr_t x;
+  int i, s1, s2;
+
+  mpfr_init(x);
+  for(i = 0 ; i < 100 ; i++)
+    {
+      mpfr_urandomb (x, RANDS);
+      if (i&1)
+        {
+          MPFR_SET_POS(x);
+          s2 = 1;
+        }
+      else
+        {
+          MPFR_SET_NEG(x);
+          s2 = -1;
+        }
+      s1 = mpfr_sgn(x);
+      if (s1 < -1 || s1 > 1)
+        {
+          printf("Error for sgn: out of range.\n");
+          goto lexit;
+        }
+      else if (MPFR_IS_NAN(x) || MPFR_IS_ZERO(x))
+        {
+          if (s1 != 0)
+            {
+              printf("Error for sgn: Nan or Zero should return 0.\n");
+              goto lexit;
+            }
+        }
+      else if (s1 != s2)
+        {
+          printf("Error for sgn. Return %d instead of %d.\n", s1, s2);
+          goto lexit;
+        }
+    }
+  mpfr_clear(x);
+  return;
+
+ lexit:
+  mpfr_clear(x);
+  exit(1);
+}
+
+int
+main (int argc, char *argv[])
+{
+  tests_start_mpfr ();
+
+  check_special ();
+  check_sgn ();
+
+  tests_end_mpfr ();
+  return 0;
+}