Add libgmp 6.2.0 to third_party
Don't build it yet. That will come in the next review.
Change-Id: Idf3266558165e5ab45f4a41c98cc8c838c8244d5
diff --git a/third_party/gmp/cxx/ismpznw.cc b/third_party/gmp/cxx/ismpznw.cc
new file mode 100644
index 0000000..84f2806
--- /dev/null
+++ b/third_party/gmp/cxx/ismpznw.cc
@@ -0,0 +1,72 @@
+/* __gmpz_operator_in_nowhite -- C++-style input of mpz_t, no whitespace skip.
+
+Copyright 2001, 2003 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 either:
+
+ * 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.
+
+or
+
+ * the GNU General Public License as published by the Free Software
+ Foundation; either version 2 of the License, or (at your option) any
+ later version.
+
+or both in parallel, as here.
+
+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 General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library. If not,
+see https://www.gnu.org/licenses/. */
+
+#include <cctype>
+#include <iostream>
+#include <string>
+#include "gmp-impl.h"
+
+using namespace std;
+
+
+// For g++ libstdc++ parsing see num_get<chartype,initer>::_M_extract_int in
+// include/bits/locale_facets.tcc.
+
+istream &
+__gmpz_operator_in_nowhite (istream &i, mpz_ptr z, char c)
+{
+ int base;
+ string s;
+ bool ok = false, zero, showbase;
+
+ if (c == '-' || c == '+') // sign
+ {
+ if (c == '-') // mpz_set_str doesn't accept '+'
+ s = "-";
+ i.get(c);
+ }
+
+ base = __gmp_istream_set_base(i, c, zero, showbase); // select the base
+ __gmp_istream_set_digits(s, i, c, ok, base); // read the number
+
+ if (i.good()) // last character read was non-numeric
+ i.putback(c);
+ else if (i.eof() && (ok || zero)) // stopped just before eof
+ i.clear(ios::eofbit);
+
+ if (ok)
+ ASSERT_NOCARRY (mpz_set_str (z, s.c_str(), base)); // extract the number
+ else if (zero)
+ mpz_set_ui(z, 0);
+ else
+ i.setstate(ios::failbit); // read failed
+
+ return i;
+}