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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2015 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 .
*/
#include "tokenize.h"
#include "checkstring.h"
#include "testsuite.h"
#include "preprocessor.h"
#include "testutils.h"
#include
extern std::ostringstream errout;
class TestString : public TestFixture {
public:
TestString() : TestFixture("TestString") {
}
private:
void run() {
TEST_CASE(alwaysTrueFalseStringCompare);
TEST_CASE(suspiciousStringCompare);
TEST_CASE(suspiciousStringCompare_char);
TEST_CASE(strPlusChar1); // "/usr" + '/'
TEST_CASE(strPlusChar2); // "/usr" + ch
TEST_CASE(strPlusChar3); // ok: path + "/sub" + '/'
TEST_CASE(strPlusChar4); // ast
TEST_CASE(sprintf1); // Dangerous usage of sprintf
TEST_CASE(sprintf2);
TEST_CASE(sprintf3);
TEST_CASE(sprintf4); // struct member
TEST_CASE(incorrectStringCompare);
}
void check(const char code[], const char filename[] = "test.cpp") {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("warning");
settings.addEnabled("style");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, filename);
// Check char variable usage..
CheckString checkString(&tokenizer, &settings, this);
checkString.runChecks(&tokenizer, &settings, this);
tokenizer.simplifyTokenList2();
checkString.runSimplifiedChecks(&tokenizer, &settings, this);
}
void check_preprocess_suppress(const char precode[]) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("warning");
// Preprocess file..
Preprocessor preprocessor(&settings, this);
std::list configurations;
std::string filedata;
std::istringstream fin(precode);
preprocessor.preprocess(fin, filedata, configurations, "test.cpp", settings._includePaths);
const std::string code = preprocessor.getcode(filedata, "", "test.cpp");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check..
CheckString checkString(&tokenizer, &settings, this);
checkString.checkAlwaysTrueOrFalseStringCompare();
}
void alwaysTrueFalseStringCompare() {
check("void f() {\n"
" if (strcmp(\"A\",\"A\")){}\n"
" if (strncmp(\"A\",\"A\",1)){}\n"
" if (strcasecmp(\"A\",\"A\")){}\n"
" if (strncasecmp(\"A\",\"A\",1)){}\n"
" if (memcmp(\"A\",\"A\",1)){}\n"
" if (strverscmp(\"A\",\"A\")){}\n"
" if (bcmp(\"A\",\"A\",1)){}\n"
" if (wcsncasecmp(L\"A\",L\"A\",1)){}\n"
" if (wcsncmp(L\"A\",L\"A\",1)){}\n"
" if (wmemcmp(L\"A\",L\"A\",1)){}\n"
" if (wcscmp(L\"A\",L\"A\")){}\n"
" if (wcscasecmp(L\"A\",L\"A\")){}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:3]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:4]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:5]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:6]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:7]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:8]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:9]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:10]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:11]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:12]: (warning) Unnecessary comparison of static strings.\n"
"[test.cpp:13]: (warning) Unnecessary comparison of static strings.\n", errout.str());
// avoid false positives when the address is modified #6415
check("void f(void *p, int offset) {\n"
" if (!memcmp(p, p + offset, 42)){}\n"
" if (!memcmp(p + offset, p, 42)){}\n"
" if (!memcmp(offset + p, p, 42)){}\n"
" if (!memcmp(p, offset + p, 42)){}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// avoid false positives when the address is modified #6415
check("void f(char *c, int offset) {\n"
" if (!memcmp(c, c + offset, 42)){}\n"
" if (!memcmp(c + offset, c, 42)){}\n"
" if (!memcmp(offset + c, c, 42)){}\n"
" if (!memcmp(c, offset + c, 42)){}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// avoid false positives when the address is modified #6415
check("void f(std::string s, int offset) {\n"
" if (!memcmp(s.c_str(), s.c_str() + offset, 42)){}\n"
" if (!memcmp(s.c_str() + offset, s.c_str(), 42)){}\n"
" if (!memcmp(offset + s.c_str(), s.c_str(), 42)){}\n"
" if (!memcmp(s.c_str(), offset + s.c_str(), 42)){}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"#define MACRO \"00FF00\"\n"
"int main()\n"
"{\n"
" if (strcmp(MACRO,\"00FF00\") == 0)"
" {"
" std::cout