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