473 lines
13 KiB
C++
473 lines
13 KiB
C++
/*
|
|
* Cppcheck - A tool for static C/C++ code analysis
|
|
* Copyright (C) 2007-2009 Daniel Marjamäki and Cppcheck team.
|
|
*
|
|
* 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/
|
|
*/
|
|
|
|
#include "../src/tokenize.h"
|
|
#include "../src/checkother.h"
|
|
#include "testsuite.h"
|
|
#include <sstream>
|
|
|
|
extern std::ostringstream errout;
|
|
|
|
class TestOther : public TestFixture
|
|
{
|
|
public:
|
|
TestOther() : TestFixture("TestOther")
|
|
{ }
|
|
|
|
private:
|
|
|
|
|
|
void run()
|
|
{
|
|
TEST_CASE(zeroDiv1);
|
|
TEST_CASE(zeroDiv2);
|
|
|
|
TEST_CASE(delete1);
|
|
TEST_CASE(delete2);
|
|
|
|
TEST_CASE(unreachable1);
|
|
|
|
TEST_CASE(sprintf1); // Dangerous usage of sprintf
|
|
TEST_CASE(sprintf2);
|
|
TEST_CASE(sprintf3);
|
|
TEST_CASE(sprintf4); // struct member
|
|
|
|
TEST_CASE(strPlusChar1); // "/usr" + '/'
|
|
TEST_CASE(strPlusChar2); // "/usr" + ch
|
|
TEST_CASE(strPlusChar3); // ok: path + "/sub" + '/'
|
|
|
|
TEST_CASE(varScope1);
|
|
TEST_CASE(varScope2);
|
|
TEST_CASE(varScope3);
|
|
TEST_CASE(varScope4);
|
|
|
|
TEST_CASE(nullpointer1);
|
|
TEST_CASE(nullpointer2);
|
|
|
|
TEST_CASE(oldStylePointerCast);
|
|
}
|
|
|
|
void check(const char code[])
|
|
{
|
|
// Tokenize..
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
|
|
// Simplify token list..
|
|
tokenizer.simplifyTokenList();
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
// Check for redundant code..
|
|
Settings settings;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.WarningRedundantCode();
|
|
checkOther.CheckZeroDivision();
|
|
}
|
|
|
|
|
|
|
|
|
|
void zeroDiv1()
|
|
{
|
|
check("void foo()\n"
|
|
"{\n"
|
|
" int a = 0;\n"
|
|
" double b = 1.;\n"
|
|
" cout<<b/a;\n"
|
|
"}");
|
|
|
|
|
|
ASSERT_EQUALS("[test.cpp:5]: (error) Division by zero\n", errout.str());
|
|
}
|
|
|
|
void zeroDiv2()
|
|
{
|
|
check("void foo()\n"
|
|
"{\n"
|
|
" int sum = 0;\n"
|
|
" int n = 100;\n"
|
|
" for(int i = 0; i < n; i ++)\n"
|
|
" {\n"
|
|
" sum += i; \n"
|
|
" }\n"
|
|
" cout<<b/sum;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
|
|
check("void foo()\n"
|
|
"{\n"
|
|
" int a = 0 ? (2/0) : 0;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void delete1()
|
|
{
|
|
check("void foo()\n"
|
|
"{\n"
|
|
" if (p)\n"
|
|
" {\n"
|
|
" delete p;\n"
|
|
" p = 0;\n"
|
|
" }\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void delete2()
|
|
{
|
|
check("void foo()\n"
|
|
"{\n"
|
|
" if (p)\n"
|
|
" {\n"
|
|
" delete p;\n"
|
|
" }\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
|
|
|
|
check("void foo()\n"
|
|
"{\n"
|
|
" if (p)\n"
|
|
" delete p;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
|
|
|
|
check("void foo()\n"
|
|
"{\n"
|
|
" if (p != NULL)\n"
|
|
" delete p;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
|
|
|
|
check("void foo()\n"
|
|
"{\n"
|
|
" if (p)\n"
|
|
" delete [] p;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant condition. It is safe to deallocate a NULL pointer\n", errout.str());
|
|
}
|
|
|
|
void unreachable1()
|
|
{
|
|
check("void foo()\n"
|
|
"{\n"
|
|
" switch (p)\n"
|
|
" {\n"
|
|
" default:\n"
|
|
" return 0;\n"
|
|
" break;\n"
|
|
" }\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
|
|
|
|
void sprintfUsage(const char code[])
|
|
{
|
|
// Tokenize..
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
tokenizer.setVarId();
|
|
|
|
//tokenizer.tokens()->printOut( "tokens" );
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
// Check for redundant code..
|
|
Settings settings;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.InvalidFunctionUsage();
|
|
}
|
|
|
|
void sprintf1()
|
|
{
|
|
sprintfUsage("void foo()\n"
|
|
"{\n"
|
|
" char buf[100];\n"
|
|
" sprintf(buf,\"%s\",buf);\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Overlapping data buffer buf\n", errout.str());
|
|
}
|
|
|
|
void sprintf2()
|
|
{
|
|
sprintfUsage("void foo()\n"
|
|
"{\n"
|
|
" char buf[100];\n"
|
|
" sprintf(buf,\"%i\",sizeof(buf));\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void sprintf3()
|
|
{
|
|
sprintfUsage("void foo()\n"
|
|
"{\n"
|
|
" char buf[100];\n"
|
|
" sprintf(buf,\"%i\",sizeof(buf));\n"
|
|
" if (buf[0]);\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void sprintf4()
|
|
{
|
|
sprintfUsage("struct A\n"
|
|
"{\n"
|
|
" char filename[128];\n"
|
|
"};\n"
|
|
"\n"
|
|
"void foo()\n"
|
|
"{\n"
|
|
" const char* filename = \"hello\";\n"
|
|
" struct A a;\n"
|
|
" snprintf(a.filename, 128, \"%s\", filename);\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void strPlusChar(const char code[])
|
|
{
|
|
// Tokenize..
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
tokenizer.setVarId();
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
// Check for redundant code..
|
|
Settings settings;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.strPlusChar();
|
|
}
|
|
|
|
void strPlusChar1()
|
|
{
|
|
// Strange looking pointer arithmetic..
|
|
strPlusChar("void foo()\n"
|
|
"{\n"
|
|
" const char *p = \"/usr\" + '/';\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:3]: (error) Unusual pointer arithmetic\n", errout.str());
|
|
}
|
|
|
|
void strPlusChar2()
|
|
{
|
|
// Strange looking pointer arithmetic..
|
|
strPlusChar("void foo()\n"
|
|
"{\n"
|
|
" char ch = '/';\n"
|
|
" const char *p = \"/usr\" + ch;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Unusual pointer arithmetic\n", errout.str());
|
|
}
|
|
|
|
void strPlusChar3()
|
|
{
|
|
// Strange looking pointer arithmetic..
|
|
strPlusChar("void foo()\n"
|
|
"{\n"
|
|
" std::string temp = \"/tmp\";\n"
|
|
" std::string path = temp + '/' + \"sub\" + '/';\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
|
|
|
|
void varScope(const char code[])
|
|
{
|
|
// Tokenize..
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
tokenizer.simplifyTokenList();
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
// Check for redundant code..
|
|
Settings settings;
|
|
settings._checkCodingStyle = true;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.CheckVariableScope();
|
|
}
|
|
|
|
void varScope1()
|
|
{
|
|
varScope("unsigned short foo()\n"
|
|
"{\n"
|
|
" test_client CClient;\n"
|
|
" try\n"
|
|
" {\n"
|
|
" if (CClient.Open())\n"
|
|
" {\n"
|
|
" return 0;\n"
|
|
" }\n"
|
|
" }\n"
|
|
" catch (...)\n"
|
|
" {\n"
|
|
" return 2;\n"
|
|
" }\n"
|
|
"\n"
|
|
" try\n"
|
|
" {\n"
|
|
" CClient.Close();\n"
|
|
" }\n"
|
|
" catch (...)\n"
|
|
" {\n"
|
|
" return 2;\n"
|
|
" }\n"
|
|
"\n"
|
|
" return 1;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void varScope2()
|
|
{
|
|
varScope("int foo()\n"
|
|
"{\n"
|
|
" Error e;\n"
|
|
" e.SetValue(12);\n"
|
|
" throw e;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void varScope3()
|
|
{
|
|
varScope("void foo()\n"
|
|
"{\n"
|
|
" int i;\n"
|
|
" int *p = 0;\n"
|
|
" if (abc)\n"
|
|
" {\n"
|
|
" p = &i;\n"
|
|
" }\n"
|
|
" *p = 1;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void varScope4()
|
|
{
|
|
varScope("void foo()\n"
|
|
"{\n"
|
|
" int i;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
|
|
|
|
|
|
void checkNullPointer(const char code[])
|
|
{
|
|
// Tokenize..
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
tokenizer.setVarId();
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
// Check for redundant code..
|
|
Settings settings;
|
|
settings._checkCodingStyle = true;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.nullPointer();
|
|
}
|
|
|
|
|
|
void nullpointer1()
|
|
{
|
|
checkNullPointer("int foo(const Token *tok)\n"
|
|
"{\n"
|
|
" while (tok);\n"
|
|
" tok = tok->next();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (error) Possible null pointer dereference\n", errout.str());
|
|
}
|
|
|
|
void nullpointer2()
|
|
{
|
|
// Null pointer dereference can only happen with pointers
|
|
checkNullPointer("void foo()\n"
|
|
"{\n"
|
|
" Fred fred;\n"
|
|
" while (fred);\n"
|
|
" fred.hello();\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
void checkOldStylePointerCast(const char code[])
|
|
{
|
|
// Tokenize..
|
|
Tokenizer tokenizer;
|
|
std::istringstream istr(code);
|
|
tokenizer.tokenize(istr, "test.cpp");
|
|
tokenizer.setVarId();
|
|
|
|
// Clear the error buffer..
|
|
errout.str("");
|
|
|
|
// Check for redundant code..
|
|
Settings settings;
|
|
settings._checkCodingStyle = true;
|
|
CheckOther checkOther(&tokenizer, &settings, this);
|
|
checkOther.WarningOldStylePointerCast();
|
|
}
|
|
|
|
void oldStylePointerCast()
|
|
{
|
|
checkOldStylePointerCast("class Base;\n"
|
|
"void foo()\n"
|
|
"{\n"
|
|
" Base * b = (Base *) derived;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
|
|
|
|
|
|
checkOldStylePointerCast("class B;\n"
|
|
"class A\n"
|
|
"{\n"
|
|
" virtual void abc(B *) const = 0;\n"
|
|
"}\n");
|
|
ASSERT_EQUALS("", errout.str());
|
|
}
|
|
|
|
};
|
|
|
|
REGISTER_TEST(TestOther)
|
|
|