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1 files changed, 89 insertions, 0 deletions

diff --git a/mpz/rootrem.c b/mpz/rootrem.c
new file mode 100644
index 000000000..78d418471
--- /dev/null
+++ b/mpz/rootrem.c
@@ -0,0 +1,89 @@
+/* mpz_rootrem(root, rem, u, nth) --  Set ROOT to floor(U^(1/nth)) and
+   set REM to the remainder.  Return an indication if the result is exact.
+
+Copyright 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP 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 GNU MP 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 MP 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 <stdio.h>  /* for NULL */
+#include <stdlib.h> /* for abort */
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+int
+mpz_rootrem (mpz_ptr root, mpz_ptr rem, mpz_srcptr u, unsigned long int nth)
+{
+  mp_ptr rootp, up, remp;
+  mp_size_t us, un, rootn, remn;
+
+  up = PTR(u);
+  us = SIZ(u);
+
+  /* even roots of negatives provoke an exception */
+  if (us < 0 && (nth & 1) == 0)
+    SQRT_OF_NEGATIVE;
+
+  /* root extraction interpreted as c^(1/nth) means a zeroth root should
+     provoke a divide by zero, do this even if c==0 */
+  if (nth == 0)
+    DIVIDE_BY_ZERO;
+
+  if (us == 0)
+    {
+      if (root != NULL)
+	SIZ(root) = 0;
+      SIZ(rem) = 0;
+      return 1;			/* exact result */
+    }
+
+  un = ABS (us);
+  rootn = (un - 1) / nth + 1;
+
+  if (root != NULL)
+    {
+      rootp = MPZ_REALLOC (root, rootn);
+      up = PTR(u);
+    }
+  else
+    {
+      rootp = __GMP_ALLOCATE_FUNC_LIMBS (rootn);
+    }
+
+  MPZ_REALLOC (rem, un);
+  remp = PTR(rem);
+
+  if (nth == 1)
+    {
+      MPN_COPY (rootp, up, un);
+      remn = 0;
+    }
+  else
+    {
+      remn = mpn_rootrem (rootp, remp, up, un, nth);
+    }
+
+  if (root != NULL)
+    SIZ(root) = us >= 0 ? rootn : -rootn;
+  else
+    __GMP_FREE_FUNC_LIMBS (rootp, rootn);
+
+  SIZ(rem) = remn;
+
+  return remn == 0;
+}