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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2025 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 "checkvaarg.h"
#include "errortypes.h"
#include "fixture.h"
#include "helpers.h"
#include "settings.h"
#include <cstddef>
class TestVaarg : public TestFixture {
public:
TestVaarg() : TestFixture("TestVaarg") {}
private:
const Settings settings = settingsBuilder().severity(Severity::warning).build();
#define check(...) check_(__FILE__, __LINE__, __VA_ARGS__)
template<size_t size>
void check_(const char* file, int line, const char (&code)[size]) {
// Tokenize..
SimpleTokenizer tokenizer(settings, *this);
ASSERT_LOC(tokenizer.tokenize(code), file, line);
// Check..
runChecks<CheckVaarg>(tokenizer, this);
}
void run() override {
TEST_CASE(wrongParameterTo_va_start);
TEST_CASE(referenceAs_va_start);
TEST_CASE(va_end_missing);
TEST_CASE(va_list_usedBeforeStarted);
TEST_CASE(va_start_subsequentCalls);
TEST_CASE(unknownFunctionScope);
}
void wrongParameterTo_va_start() {
check("void Format(char* szFormat, char* szBuffer, size_t nSize, ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szFormat);\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) 'szFormat' given to va_start() is not last named argument of the function. Did you intend to pass 'nSize'?\n", errout_str());
check("void Format(char* szFormat, char* szBuffer, size_t nSize, ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) 'szBuffer' given to va_start() is not last named argument of the function. Did you intend to pass 'nSize'?\n", errout_str());
check("void Format(char* szFormat, char* szBuffer, size_t nSize, ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, nSize);\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("", errout_str());
check("int main(int argc, char *argv[]) {\n"
" long(^addthem)(const char *, ...) = ^long(const char *format, ...) {\n"
" va_list argp;\n"
" va_start(argp, format);\n"
" c = va_arg(argp, int);\n"
" };\n"
"}"); // Don't crash (#6032)
ASSERT_EQUALS("[test.cpp:6]: (error) va_list 'argp' was opened but not closed by va_end().\n", errout_str());
check("void Format(char* szFormat, char* szBuffer, size_t nSize, ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr);\n"
" va_end(arg_ptr);\n"
"}"); // Don't crash if less than expected arguments are given.
ASSERT_EQUALS("", errout_str());
check("void assertf_fail(const char *assertion, const char *file, int line, const char *func, const char* msg, ...) {\n"
" struct A {\n"
" A(char* buf, int size) {}\n"
" void printf(const char * format, ...) {\n"
" va_list args;\n"
" va_start(args, format);\n"
" va_end(args);\n"
" }\n"
" };\n"
"}"); // Inner class (#6453)
ASSERT_EQUALS("", errout_str());
}
void referenceAs_va_start() {
check("void Format(char* szFormat, char (&szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Using reference 'szBuffer' as parameter for va_start() results in undefined behaviour.\n", errout_str());
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("", errout_str());
}
void va_end_missing() {
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("", errout_str());
// #6186
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
" try {\n"
" throw sth;\n"
" } catch(...) {\n"
" va_end(arg_ptr);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout_str());
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) va_list 'arg_ptr' was opened but not closed by va_end().\n", errout_str());
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
" if(sth) return;\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) va_list 'arg_ptr' was opened but not closed by va_end().\n", errout_str());
// #8124
check("void f(int n, ...)\n"
"{\n"
" va_list ap;\n"
" va_start(ap, n);\n"
" std::vector<std::string> v(n);\n"
" std::generate_n(v.begin(), n, [&ap]()\n"
" {\n"
" return va_arg(ap, const char*);\n"
" });\n"
" va_end(ap);\n"
"}");
ASSERT_EQUALS("", errout_str());
check("void f(int n, ...)\n"
"{\n"
" va_list ap;\n"
" va_start(ap, n);\n"
" std::vector<std::string> v(n);\n"
" std::generate_n(v.begin(), n, [&ap]()\n"
" {\n"
" return va_arg(ap, const char*);\n"
" });\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (error) va_list 'ap' was opened but not closed by va_end().\n", errout_str());
}
void va_list_usedBeforeStarted() {
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" return va_arg(arg_ptr, float);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) va_list 'arg_ptr' used before va_start() was called.\n", errout_str());
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" foo(arg_ptr);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) va_list 'arg_ptr' used before va_start() was called.\n", errout_str());
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_copy(f, arg_ptr);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) va_list 'arg_ptr' used before va_start() was called.\n", errout_str());
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
" va_end(arg_ptr);\n"
" return va_arg(arg_ptr, float);\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) va_list 'arg_ptr' used before va_start() was called.\n", errout_str());
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) va_list 'arg_ptr' used before va_start() was called.\n", errout_str());
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
" va_end(arg_ptr);\n"
" va_start(arg_ptr, szBuffer);\n"
" foo(va_arg(arg_ptr, float));\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("", errout_str());
// #6066
check("void Format(va_list v1) {\n"
" va_list v2;\n"
" va_copy(v2, v1);\n"
" foo(va_arg(v1, float));\n"
" va_end(v2);\n"
"}");
ASSERT_EQUALS("", errout_str());
// #7527
check("void foo(int flag1, int flag2, ...) {\n"
" switch (flag1) {\n"
" default:\n"
" va_list vargs;\n"
" va_start(vargs, flag2);\n"
" if (flag2) {\n"
" va_end(vargs);\n"
" break;\n"
" }\n"
" int data = va_arg(vargs, int);\n"
" va_end(vargs);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout_str());
// #7533
check("void action_push(int type, ...) {\n"
" va_list args;\n"
" va_start(args, type);\n"
" switch (push_mode) {\n"
" case UNDO:\n"
" list_add(&act->node, &to_redo);\n"
" break;\n"
" case REDO:\n"
" list_add(&act->node, &to_undo);\n"
" break;\n"
" }\n"
" va_end(args);\n"
"}");
ASSERT_EQUALS("", errout_str());
check("void action_push(int type, ...) {\n"
" va_list args;\n"
" va_start(args, type);\n"
" switch (push_mode) {\n"
" case UNDO:\n"
" list_add(&act->node, &to_redo);\n"
" va_end(args);\n"
" break;\n"
" case REDO:\n"
" list_add(&act->node, &to_undo);\n"
" va_end(args);\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout_str());
check("void action_push(int type, ...) {\n"
" va_list args;\n"
" va_start(args, type);\n"
" switch (push_mode) {\n"
" case UNDO:\n"
" list_add(&act->node, &to_redo);\n"
" break;\n"
" case REDO:\n"
" list_add(&act->node, &to_undo);\n"
" va_end(args);\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:13]: (error) va_list 'args' was opened but not closed by va_end().\n", errout_str());
// #8043
check("void redisvFormatCommand(char *format, va_list ap, bool flag) {\n"
" va_list _cpy;\n"
" va_copy(_cpy, ap);\n"
" if (flag)\n"
" goto fmt_valid;\n"
" va_end(_cpy);\n"
" goto format_err;\n"
"fmt_valid:\n"
" sdscatvprintf(curarg, _format, _cpy);\n"
" va_end(_cpy);\n"
"format_err:\n"
"}");
ASSERT_EQUALS("", errout_str());
}
void va_start_subsequentCalls() {
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
" va_start(arg_ptr, szBuffer);\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) va_start() or va_copy() called subsequently on 'arg_ptr' without va_end() in between.\n", errout_str());
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list vl1;\n"
" va_start(vl1, szBuffer);\n"
" va_copy(vl1, vl1);\n"
" va_end(vl1);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) va_start() or va_copy() called subsequently on 'vl1' without va_end() in between.\n", errout_str());
check("void Format(char* szFormat, char (*szBuffer)[_Size], ...) {\n"
" va_list arg_ptr;\n"
" va_start(arg_ptr, szBuffer);\n"
" va_end(arg_ptr);\n"
" va_start(arg_ptr, szBuffer);\n"
" va_end(arg_ptr);\n"
"}");
ASSERT_EQUALS("", errout_str());
}
void unknownFunctionScope() {
check("void BG_TString::Format() {\n"
" BG_TChar * f;\n"
" va_start(args,f);\n"
" BG_TString result(f);\n"
"}");
ASSERT_EQUALS("", errout_str());
// #7559
check("void mowgli_object_message_broadcast(mowgli_object_t *self, const char *name, ...) {\n"
" va_list va;\n"
" MOWGLI_LIST_FOREACH(n, self->klass->message_handlers.head) {\n"
" if (!strcasecmp(sig2->name, name))\n"
" break;\n"
" }\n"
" va_start(va, name);\n"
" va_end(va);\n"
"}");
}
};
REGISTER_TEST(TestVaarg)
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