cppcheck/testdivision.cpp

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/*
* c++check - c/c++ syntax checking
* Copyright (C) 2007 Daniel Marjamäki
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/
*/
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// Check for dangerous division..
// such as "svar / uvar". Treating "svar" as unsigned data is not good
#define UNIT_TESTING
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#include "tokenize.h"
#include "checkother.h"
#include "testsuite.h"
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#include <sstream>
extern std::ostringstream errout;
class TestDivision : public TestFixture
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{
public:
TestDivision() : TestFixture("TestDivision")
{ }
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private:
void check( const char code[] )
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize( istr, "test.cpp" );
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// Clear the error buffer..
errout.str("");
// Check for unsigned divisions..
CheckOther checkOther( &tokenizer, this );
checkOther.CheckUnsignedDivision();
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}
void run()
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{
TEST_CASE( division1 );
TEST_CASE( division2 );
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TEST_CASE( division3 );
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TEST_CASE( division4 );
TEST_CASE( division5 );
TEST_CASE( division6 );
TEST_CASE( division7 );
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}
void division1()
{
check( "void f()\n"
"{\n"
" int ivar = -2;\n"
" unsigned int uvar = 2;\n"
" return ivar / uvar;\n"
"}\n" );
ASSERT_EQUALS( std::string("[test.cpp:5]: Warning: Division with signed and unsigned operators\n"), errout.str() );
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}
void division2()
{
check( "void f()\n"
"{\n"
" int ivar = -2;\n"
" unsigned int uvar = 2;\n"
" return uvar / ivar;\n"
"}\n" );
ASSERT_EQUALS( std::string("[test.cpp:5]: Warning: Division with signed and unsigned operators\n"), errout.str() );
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}
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void division3()
{
check( "typedef int s32;\n"
"typedef unsigned int u32;\n"
"void f()\n"
"{\n"
" s32 ivar = -2;\n"
" u32 uvar = 2;\n"
" return uvar / ivar;\n"
"}\n" );
ASSERT_EQUALS( std::string("[test.cpp:7]: Warning: Division with signed and unsigned operators\n"), errout.str() );
}
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void division4()
{
check( "void f1()\n"
"{\n"
" int i1;\n"
"}\n"
"\n"
"void f2(unsigned int i1)\n"
"{\n"
" unsigned int i2;\n"
" result = i2 / i1;\n"
);
ASSERT_EQUALS( std::string(""), errout.str() );
}
void division5()
{
check( "#define USER_HASH (16)\n"
"void foo()\n"
"{\n"
" unsigned int val = 32;\n"
" val = val / USER_HASH;\n"
);
ASSERT_EQUALS( std::string(""), errout.str() );
}
void division6()
{
check( "void foo()\n"
"{\n"
" unsigned int val = 32;\n"
" int i = val / -2;\n"
);
ASSERT_EQUALS( std::string("[test.cpp:4]: Unsigned division. The result will be wrong.\n"), errout.str() );
}
void division7()
{
check( "void foo()\n"
"{\n"
" unsigned int val = 32;\n"
" int i = -96 / val;\n"
);
ASSERT_EQUALS( std::string("[test.cpp:4]: Unsigned division. The result will be wrong.\n"), errout.str() );
}
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};
REGISTER_TEST( TestDivision )
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