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/*
* Copyright Andrey Semashev 2022.
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
* http://www.boost.org/LICENSE_1_0.txt)
*/
/*!
* \file snprintf_test.cpp
* \author Andrey Semashev
* \date 06.12.2022
*
* This file contains tests for \c boost::core::snprintf.
*/
#include <boost/core/snprintf.hpp>
#include <cstddef>
#include <cstring>
#include <boost/core/lightweight_test.hpp>
void test_snprintf()
{
char buf[11];
std::memset(buf, 0xFF, sizeof(buf));
std::size_t buf_size = sizeof(buf) - 1u;
int res = boost::core::snprintf(buf, buf_size, "%s", "0123");
BOOST_TEST_EQ(res, 4);
int cmp_res = std::memcmp(buf, "0123", sizeof("0123"));
BOOST_TEST_EQ(cmp_res, 0);
std::memset(buf, 0xFF, sizeof(buf));
// Suppress compiler checks for buffer overflow
const char* volatile str = "0123456789";
res = boost::core::snprintf(buf, buf_size, "%s", str);
BOOST_TEST_GE(res, 10);
cmp_res = std::memcmp(buf, "012345678", sizeof("012345678"));
BOOST_TEST_EQ(cmp_res, 0);
BOOST_TEST_EQ(buf[10], static_cast< char >(~static_cast< char >(0)));
std::memset(buf, 0xFF, sizeof(buf));
res = boost::core::snprintf(buf, 0, "%s", str);
BOOST_TEST_GE(res, 0);
BOOST_TEST_EQ(buf[0], static_cast< char >(~static_cast< char >(0)));
}
void test_swprintf()
{
wchar_t buf[11];
std::memset(buf, 0xFF, sizeof(buf));
std::size_t buf_size = sizeof(buf) / sizeof(*buf) - 1u;
int res = boost::core::swprintf(buf, buf_size, L"%ls", L"0123");
BOOST_TEST_EQ(res, 4);
int cmp_res = std::memcmp(buf, L"0123", sizeof(L"0123"));
BOOST_TEST_EQ(cmp_res, 0);
std::memset(buf, 0xFF, sizeof(buf));
// Suppress compiler checks for buffer overflow
const wchar_t* volatile str = L"0123456789";
res = boost::core::swprintf(buf, buf_size, L"%ls", str);
BOOST_TEST_LT(res, 0);
// swprintf may or may not write to the buffer in case of overflow.
// E.g. glibc 2.35 doesn't and libc on MacOS 11 does.
BOOST_TEST_EQ(buf[10], static_cast< wchar_t >(~static_cast< wchar_t >(0)));
std::memset(buf, 0xFF, sizeof(buf));
res = boost::core::swprintf(buf, 0, L"%ls", str);
BOOST_TEST_LT(res, 0);
BOOST_TEST_EQ(buf[0], static_cast< wchar_t >(~static_cast< wchar_t >(0)));
}
int main()
{
test_snprintf();
test_swprintf();
return boost::report_errors();
}
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