Initial revision

1 files changed, 107 insertions, 0 deletions

diff --git a/mpz/sqrtrem.c b/mpz/sqrtrem.c
new file mode 100644
index 000000000..757cc5dd5
--- /dev/null
+++ b/mpz/sqrtrem.c
@@ -0,0 +1,107 @@
+/* mpz_sqrtrem(root,rem,x) -- Set ROOT to floor(sqrt(X)) and REM
+   to the remainder, i.e. X - ROOT**2.
+
+Copyright (C) 1991, 1993, 1994, 1996 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 Library General Public License as published by
+the Free Software Foundation; either version 2 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library 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 "gmp.h"
+#include "gmp-impl.h"
+
+#ifndef BERKELEY_MP
+void
+#if __STDC__
+mpz_sqrtrem (mpz_ptr root, mpz_ptr rem, mpz_srcptr op)
+#else
+mpz_sqrtrem (root, rem, op)
+     mpz_ptr root;
+     mpz_ptr rem;
+     mpz_srcptr op;
+#endif
+#else /* BERKELEY_MP */
+void
+#if __STDC__
+msqrt (mpz_srcptr op, mpz_ptr root, mpz_ptr rem)
+#else
+msqrt (op, root, rem)
+     mpz_srcptr op;
+     mpz_ptr root;
+     mpz_ptr rem;
+#endif
+#endif /* BERKELEY_MP */
+{
+  mp_size_t op_size, root_size, rem_size;
+  mp_ptr root_ptr, op_ptr;
+  mp_ptr free_me = NULL;
+  mp_size_t free_me_size;
+  TMP_DECL (marker);
+
+  TMP_MARK (marker);
+  op_size = op->_mp_size;
+  if (op_size < 0)
+    op_size = 1 / (op_size > 0); /* Divide by zero for negative OP.  */
+
+  if (rem->_mp_alloc < op_size)
+    _mpz_realloc (rem, op_size);
+
+  /* The size of the root is accurate after this simple calculation.  */
+  root_size = (op_size + 1) / 2;
+
+  root_ptr = root->_mp_d;
+  op_ptr = op->_mp_d;
+
+  if (root->_mp_alloc < root_size)
+    {
+      if (root_ptr == op_ptr)
+	{
+	  free_me = root_ptr;
+	  free_me_size = root->_mp_alloc;
+	}
+      else
+	(*_mp_free_func) (root_ptr, root->_mp_alloc * BYTES_PER_MP_LIMB);
+
+      root->_mp_alloc = root_size;
+      root_ptr = (mp_ptr) (*_mp_allocate_func) (root_size * BYTES_PER_MP_LIMB);
+      root->_mp_d = root_ptr;
+    }
+  else
+    {
+      /* Make OP not overlap with ROOT.  */
+      if (root_ptr == op_ptr)
+	{
+	  /* ROOT and OP are identical.  Allocate temporary space for OP.  */
+	  op_ptr = (mp_ptr) TMP_ALLOC (op_size * BYTES_PER_MP_LIMB);
+	  /* Copy to the temporary space.  Hack: Avoid temporary variable
+	     by using ROOT_PTR.  */
+	  MPN_COPY (op_ptr, root_ptr, op_size);
+	}
+    }
+
+  rem_size = mpn_sqrtrem (root_ptr, rem->_mp_d, op_ptr, op_size);
+
+  root->_mp_size = root_size;
+
+  /* Write remainder size last, to enable us to define this function to
+     give only the square root remainder, if the user calls if with
+     ROOT == REM.  */
+  rem->_mp_size = rem_size;
+
+  if (free_me != NULL)
+    (*_mp_free_func) (free_me, free_me_size * BYTES_PER_MP_LIMB);
+  TMP_FREE (marker);
+}