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#include <boost/test/unit_test.hpp>
#include <limits>
#include "bignum.h"
#include "util.h"
BOOST_AUTO_TEST_SUITE(bignum_tests)
// For the following test case, it is useful to use additional tools.
//
// The simplest one to use is the compiler flag -ftrapv, which detects integer
// overflows and similar errors. However, due to optimizations and compilers
// taking advantage of undefined behavior sometimes it may not actually detect
// anything.
//
// You can also use compiler-based stack protection to possibly detect possible
// stack buffer overruns.
//
// For more accurate diagnostics, you can use an undefined arithmetic operation
// detector such as the clang-based tool:
//
// "IOC: An Integer Overflow Checker for C/C++"
//
// Available at: http://embed.cs.utah.edu/ioc/
//
// It might also be useful to use Google's AddressSanitizer to detect
// stack buffer overruns, which valgrind can't currently detect.
// Let's force this code not to be inlined, in order to actually
// test a generic version of the function. This increases the chance
// that -ftrapv will detect overflows.
NOINLINE void mysetint64(CBigNum& num, int64 n)
{
num.setint64(n);
}
// For each number, we do 2 tests: one with inline code, then we reset the
// value to 0, then the second one with a non-inlined function.
BOOST_AUTO_TEST_CASE(bignum_setint64)
{
int64 n;
{
n = 0;
CBigNum num(n);
BOOST_CHECK(num.ToString() == "0");
num.setulong(0);
BOOST_CHECK(num.ToString() == "0");
mysetint64(num, n);
BOOST_CHECK(num.ToString() == "0");
}
{
n = 1;
CBigNum num(n);
BOOST_CHECK(num.ToString() == "1");
num.setulong(0);
BOOST_CHECK(num.ToString() == "0");
mysetint64(num, n);
BOOST_CHECK(num.ToString() == "1");
}
{
n = -1;
CBigNum num(n);
BOOST_CHECK(num.ToString() == "-1");
num.setulong(0);
BOOST_CHECK(num.ToString() == "0");
mysetint64(num, n);
BOOST_CHECK(num.ToString() == "-1");
}
{
n = 5;
CBigNum num(n);
BOOST_CHECK(num.ToString() == "5");
num.setulong(0);
BOOST_CHECK(num.ToString() == "0");
mysetint64(num, n);
BOOST_CHECK(num.ToString() == "5");
}
{
n = -5;
CBigNum num(n);
BOOST_CHECK(num.ToString() == "-5");
num.setulong(0);
BOOST_CHECK(num.ToString() == "0");
mysetint64(num, n);
BOOST_CHECK(num.ToString() == "-5");
}
{
n = std::numeric_limits<int64>::min();
CBigNum num(n);
BOOST_CHECK(num.ToString() == "-9223372036854775808");
num.setulong(0);
BOOST_CHECK(num.ToString() == "0");
mysetint64(num, n);
BOOST_CHECK(num.ToString() == "-9223372036854775808");
}
{
n = std::numeric_limits<int64>::max();
CBigNum num(n);
BOOST_CHECK(num.ToString() == "9223372036854775807");
num.setulong(0);
BOOST_CHECK(num.ToString() == "0");
mysetint64(num, n);
BOOST_CHECK(num.ToString() == "9223372036854775807");
}
}
BOOST_AUTO_TEST_SUITE_END()
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