1 files changed, 102 insertions, 0 deletions
diff --git a/src/modf.c b/src/modf.c
new file mode 100644
index 0000000..a16020b
--- /dev/null
+++ b/src/modf.c
@@ -0,0 +1,102 @@
+/* mpfr_modf -- Integral and fractional part.
+
+Copyright 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
+Contributed by the AriC and Caramel 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 "mpfr-impl.h"
+
+#define INEXPOS(y) ((y) == 0 ? 0 : (((y) > 0) ? 1 : 2))
+#define INEX(y,z) (INEXPOS(y) | (INEXPOS(z) << 2))
+
+/* Set iop to the integral part of op and fop to its fractional part */
+int
+mpfr_modf (mpfr_ptr iop, mpfr_ptr fop, mpfr_srcptr op, mpfr_rnd_t rnd_mode)
+{
+  mpfr_exp_t ope;
+  mpfr_prec_t opq;
+  int inexi, inexf;
+
+  MPFR_LOG_FUNC
+    (("op[%Pu]=%.*Rg rnd=%d",
+      mpfr_get_prec (op), mpfr_log_prec, op, rnd_mode),
+     ("iop[%Pu]=%.*Rg fop[%Pu]=%.*Rg",
+      mpfr_get_prec (iop), mpfr_log_prec, iop,
+      mpfr_get_prec (fop), mpfr_log_prec, fop));
+
+  MPFR_ASSERTN (iop != fop);
+
+  if ( MPFR_UNLIKELY (MPFR_IS_SINGULAR (op)) )
+    {
+      if (MPFR_IS_NAN (op))
+        {
+          MPFR_SET_NAN (iop);
+          MPFR_SET_NAN (fop);
+          MPFR_RET_NAN;
+        }
+      MPFR_SET_SAME_SIGN (iop, op);
+      MPFR_SET_SAME_SIGN (fop, op);
+      if (MPFR_IS_INF (op))
+        {
+          MPFR_SET_INF (iop);
+          MPFR_SET_ZERO (fop);
+          MPFR_RET (0);
+        }
+      else /* op is zero */
+        {
+          MPFR_ASSERTD (MPFR_IS_ZERO (op));
+          MPFR_SET_ZERO (iop);
+          MPFR_SET_ZERO (fop);
+          MPFR_RET (0);
+        }
+    }
+
+  ope = MPFR_GET_EXP (op);
+  opq = MPFR_PREC (op);
+
+  if (ope <= 0)   /* 0 < |op| < 1 */
+    {
+      inexf = (fop != op) ? mpfr_set (fop, op, rnd_mode) : 0;
+      MPFR_SET_SAME_SIGN (iop, op);
+      MPFR_SET_ZERO (iop);
+      MPFR_RET (INEX(0, inexf));
+    }
+  else if (ope >= opq) /* op has no fractional part */
+    {
+      inexi = (iop != op) ? mpfr_set (iop, op, rnd_mode) : 0;
+      MPFR_SET_SAME_SIGN (fop, op);
+      MPFR_SET_ZERO (fop);
+      MPFR_RET (INEX(inexi, 0));
+    }
+  else /* op has both integral and fractional parts */
+    {
+      if (iop != op)
+        {
+          inexi = mpfr_rint_trunc (iop, op, rnd_mode);
+          inexf = mpfr_frac (fop, op, rnd_mode);
+        }
+      else
+        {
+          MPFR_ASSERTN (fop != op);
+          inexf = mpfr_frac (fop, op, rnd_mode);
+          inexi = mpfr_rint_trunc (iop, op, rnd_mode);
+        }
+      MPFR_RET (INEX(inexi, inexf));
+    }
+}