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/isfuns.cc b/third_party/gmp/cxx/isfuns.cc
new file mode 100644
index 0000000..0cc0db0
--- /dev/null
+++ b/third_party/gmp/cxx/isfuns.cc
@@ -0,0 +1,115 @@
+/* Auxiliary functions for C++-style input of GMP types.
+
+Copyright 2001 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;
+
+
+int
+__gmp_istream_set_base (istream &i, char &c, bool &zero, bool &showbase)
+{
+ int base;
+
+ zero = showbase = false;
+ switch (i.flags() & ios::basefield)
+ {
+ case ios::dec:
+ base = 10;
+ break;
+ case ios::hex:
+ base = 16;
+ break;
+ case ios::oct:
+ base = 8;
+ break;
+ default:
+ showbase = true; // look for initial "0" or "0x" or "0X"
+ if (c == '0')
+ {
+ if (! i.get(c))
+ c = 0; // reset or we might loop indefinitely
+
+ if (c == 'x' || c == 'X')
+ {
+ base = 16;
+ i.get(c);
+ }
+ else
+ {
+ base = 8;
+ zero = true; // if no other digit is read, the "0" counts
+ }
+ }
+ else
+ base = 10;
+ break;
+ }
+
+ return base;
+}
+
+void
+__gmp_istream_set_digits (string &s, istream &i, char &c, bool &ok, int base)
+{
+ switch (base)
+ {
+ case 10:
+ while (isdigit(c))
+ {
+ ok = true; // at least a valid digit was read
+ s += c;
+ if (! i.get(c))
+ break;
+ }
+ break;
+ case 8:
+ while (isdigit(c) && c != '8' && c != '9')
+ {
+ ok = true; // at least a valid digit was read
+ s += c;
+ if (! i.get(c))
+ break;
+ }
+ break;
+ case 16:
+ while (isxdigit(c))
+ {
+ ok = true; // at least a valid digit was read
+ s += c;
+ if (! i.get(c))
+ break;
+ }
+ break;
+ }
+}