859 lines
43 KiB
C++
859 lines
43 KiB
C++
/*
|
|
* Cppcheck - A tool for static C/C++ code analysis
|
|
* Copyright (C) 2007-2013 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 "checkio.h"
|
|
|
|
#include "tokenize.h"
|
|
#include "token.h"
|
|
#include "errorlogger.h"
|
|
#include "symboldatabase.h"
|
|
|
|
#include <cctype>
|
|
#include <cstdlib>
|
|
|
|
//---------------------------------------------------------------------------
|
|
|
|
// Register CheckIO..
|
|
namespace {
|
|
CheckIO instance;
|
|
}
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// std::cout << std::cout;
|
|
//---------------------------------------------------------------------------
|
|
void CheckIO::checkCoutCerrMisusage()
|
|
{
|
|
const SymbolDatabase * const symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
std::size_t functions = symbolDatabase->functionScopes.size();
|
|
for (std::size_t i = 0; i < functions; ++i) {
|
|
const Scope * scope = symbolDatabase->functionScopes[i];
|
|
bool firstCout = false;
|
|
for (const Token *tok = scope->classStart; tok && tok != scope->classEnd; tok = tok->next()) {
|
|
if (tok->str() == "(")
|
|
tok = tok->link();
|
|
|
|
if (Token::Match(tok, "std :: cout|cerr")) {
|
|
if (firstCout && tok->strAt(-1) == "<<" && tok->strAt(3) != ".") {
|
|
coutCerrMisusageError(tok, tok->strAt(2));
|
|
firstCout = false;
|
|
} else if (tok->strAt(3) == "<<")
|
|
firstCout = true;
|
|
} else if (firstCout && tok->str() == ";")
|
|
firstCout = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckIO::coutCerrMisusageError(const Token* tok, const std::string& streamName)
|
|
{
|
|
reportError(tok, Severity::error, "coutCerrMisusage", "Invalid usage of output stream: '<< std::" + streamName + "'.");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// fflush(stdin) <- fflush only applies to output streams in ANSI C
|
|
// fread(); fwrite(); <- consecutive read/write statements require repositioning in between
|
|
// fopen("","r"); fwrite(); <- write to read-only file (or vice versa)
|
|
// fclose(); fread(); <- Use closed file
|
|
//---------------------------------------------------------------------------
|
|
enum OpenMode {CLOSED, READ_MODE, WRITE_MODE, RW_MODE, UNKNOWN};
|
|
static OpenMode getMode(const std::string& str)
|
|
{
|
|
if (str.find('+', 1) != std::string::npos)
|
|
return RW_MODE;
|
|
else if (str.find('w') != std::string::npos || str.find('a') != std::string::npos)
|
|
return WRITE_MODE;
|
|
else if (str.find('r') != std::string::npos)
|
|
return READ_MODE;
|
|
return UNKNOWN;
|
|
}
|
|
|
|
struct Filepointer {
|
|
OpenMode mode;
|
|
unsigned int mode_indent;
|
|
enum Operation {NONE, UNIMPORTANT, READ, WRITE, POSITIONING, OPEN, CLOSE, UNKNOWN_OP} lastOperation;
|
|
unsigned int op_indent;
|
|
Filepointer(OpenMode mode_ = UNKNOWN)
|
|
: mode(mode_), mode_indent(0), lastOperation(NONE), op_indent(0) {
|
|
}
|
|
};
|
|
|
|
void CheckIO::checkFileUsage()
|
|
{
|
|
static const char* _whitelist[] = {
|
|
"clearerr", "feof", "ferror", "fgetpos", "ftell", "setbuf", "setvbuf", "ungetc"
|
|
};
|
|
static const std::set<std::string> whitelist(_whitelist, _whitelist + sizeof(_whitelist)/sizeof(*_whitelist));
|
|
|
|
std::map<unsigned int, Filepointer> filepointers;
|
|
|
|
const SymbolDatabase* symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
std::size_t varListSize = symbolDatabase->getVariableListSize();
|
|
for (std::size_t i = 1; i < varListSize; ++i) {
|
|
const Variable* var = symbolDatabase->getVariableFromVarId(i);
|
|
if (!var || !var->declarationId() || var->isArray() || !Token::simpleMatch(var->typeStartToken(), "FILE *"))
|
|
continue;
|
|
|
|
if (var->isLocal()) {
|
|
if (var->nameToken()->strAt(1) == "(") // initialize by calling "ctor"
|
|
filepointers.insert(std::make_pair(var->declarationId(), Filepointer(UNKNOWN)));
|
|
else
|
|
filepointers.insert(std::make_pair(var->declarationId(), Filepointer(CLOSED)));
|
|
} else {
|
|
filepointers.insert(std::make_pair(var->declarationId(), Filepointer(UNKNOWN)));
|
|
// TODO: If all fopen calls we find open the file in the same type, we can set Filepointer::mode
|
|
}
|
|
}
|
|
|
|
std::size_t functions = symbolDatabase->functionScopes.size();
|
|
for (std::size_t j = 0; j < functions; ++j) {
|
|
const Scope * scope = symbolDatabase->functionScopes[j];
|
|
unsigned int indent = 0;
|
|
for (const Token *tok = scope->classStart; tok != scope->classEnd; tok = tok->next()) {
|
|
if (tok->str() == "{")
|
|
indent++;
|
|
else if (tok->str() == "}") {
|
|
indent--;
|
|
for (std::map<unsigned int, Filepointer>::iterator i = filepointers.begin(); i != filepointers.end(); ++i) {
|
|
if (indent < i->second.mode_indent) {
|
|
i->second.mode_indent = 0;
|
|
i->second.mode = UNKNOWN;
|
|
}
|
|
if (indent < i->second.op_indent) {
|
|
i->second.op_indent = 0;
|
|
i->second.lastOperation = Filepointer::UNKNOWN_OP;
|
|
}
|
|
}
|
|
} else if (tok->str() == "return" || tok->str() == "continue" || tok->str() == "break") { // Reset upon return, continue or break
|
|
for (std::map<unsigned int, Filepointer>::iterator i = filepointers.begin(); i != filepointers.end(); ++i) {
|
|
i->second.mode_indent = 0;
|
|
i->second.mode = UNKNOWN;
|
|
i->second.op_indent = 0;
|
|
i->second.lastOperation = Filepointer::UNKNOWN_OP;
|
|
}
|
|
} else if (tok->varId() && Token::Match(tok, "%var% =") && (tok->strAt(2) != "fopen" && tok->strAt(2) != "freopen" && tok->strAt(2) != "tmpfile")) {
|
|
std::map<unsigned int, Filepointer>::iterator i = filepointers.find(tok->varId());
|
|
if (i != filepointers.end()) {
|
|
i->second.mode = UNKNOWN;
|
|
i->second.lastOperation = Filepointer::UNKNOWN_OP;
|
|
}
|
|
} else if (Token::Match(tok, "%var% (") && tok->previous() && (!tok->previous()->isName() || Token::Match(tok->previous(), "return|throw"))) {
|
|
std::string mode;
|
|
const Token* fileTok = 0;
|
|
Filepointer::Operation operation = Filepointer::NONE;
|
|
|
|
if ((tok->str() == "fopen" || tok->str() == "freopen" || tok->str() == "tmpfile") && tok->strAt(-1) == "=") {
|
|
if (tok->str() != "tmpfile") {
|
|
const Token* modeTok = tok->tokAt(2)->nextArgument();
|
|
if (modeTok && modeTok->type() == Token::eString)
|
|
mode = modeTok->strValue();
|
|
} else
|
|
mode = "wb+";
|
|
fileTok = tok->tokAt(-2);
|
|
operation = Filepointer::OPEN;
|
|
} else if (tok->str() == "rewind" || tok->str() == "fseek" || tok->str() == "fsetpos" || tok->str() == "fflush") {
|
|
if (Token::simpleMatch(tok, "fflush ( stdin )"))
|
|
fflushOnInputStreamError(tok, tok->strAt(2));
|
|
else {
|
|
fileTok = tok->tokAt(2);
|
|
operation = Filepointer::POSITIONING;
|
|
}
|
|
} else if (tok->str() == "fgetc" || tok->str() == "fgets" || tok->str() == "fread" || tok->str() == "fscanf" || tok->str() == "getc") {
|
|
if (tok->str() == "fscanf")
|
|
fileTok = tok->tokAt(2);
|
|
else
|
|
fileTok = tok->linkAt(1)->previous();
|
|
operation = Filepointer::READ;
|
|
} else if (tok->str() == "fputc" || tok->str() == "fputs" || tok->str() == "fwrite" || tok->str() == "fprintf" || tok->str() == "putcc") {
|
|
if (tok->str() == "fprintf")
|
|
fileTok = tok->tokAt(2);
|
|
else
|
|
fileTok = tok->linkAt(1)->previous();
|
|
operation = Filepointer::WRITE;
|
|
} else if (tok->str() == "fclose") {
|
|
fileTok = tok->tokAt(2);
|
|
operation = Filepointer::CLOSE;
|
|
} else if (whitelist.find(tok->str()) != whitelist.end()) {
|
|
fileTok = tok->tokAt(2);
|
|
if (tok->str() == "ungetc" && fileTok)
|
|
fileTok = fileTok->nextArgument();
|
|
operation = Filepointer::UNIMPORTANT;
|
|
} else if (!Token::Match(tok, "if|for|while|catch|switch")) {
|
|
const Token* const end2 = tok->linkAt(1);
|
|
for (const Token* tok2 = tok->tokAt(2); tok2 != end2; tok2 = tok2->next()) {
|
|
if (tok2->varId() && filepointers.find(tok2->varId()) != filepointers.end()) {
|
|
fileTok = tok2;
|
|
operation = Filepointer::UNKNOWN_OP; // Assume that repositioning was last operation and that the file is opened now
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
while (Token::Match(fileTok, "%var% ."))
|
|
fileTok = fileTok->tokAt(2);
|
|
|
|
if (!fileTok || !fileTok->varId())
|
|
continue;
|
|
|
|
if (filepointers.find(fileTok->varId()) == filepointers.end()) { // function call indicates: Its a File
|
|
filepointers.insert(std::make_pair(fileTok->varId(), Filepointer(UNKNOWN)));
|
|
}
|
|
Filepointer& f = filepointers[fileTok->varId()];
|
|
|
|
switch (operation) {
|
|
case Filepointer::OPEN:
|
|
f.mode = getMode(mode);
|
|
f.mode_indent = indent;
|
|
break;
|
|
case Filepointer::POSITIONING:
|
|
if (f.mode == CLOSED)
|
|
useClosedFileError(tok);
|
|
break;
|
|
case Filepointer::READ:
|
|
if (f.mode == CLOSED)
|
|
useClosedFileError(tok);
|
|
else if (f.mode == WRITE_MODE)
|
|
readWriteOnlyFileError(tok);
|
|
else if (f.lastOperation == Filepointer::WRITE)
|
|
ioWithoutPositioningError(tok);
|
|
break;
|
|
case Filepointer::WRITE:
|
|
if (f.mode == CLOSED)
|
|
useClosedFileError(tok);
|
|
else if (f.mode == READ_MODE)
|
|
writeReadOnlyFileError(tok);
|
|
else if (f.lastOperation == Filepointer::READ)
|
|
ioWithoutPositioningError(tok);
|
|
break;
|
|
case Filepointer::CLOSE:
|
|
if (f.mode == CLOSED)
|
|
useClosedFileError(tok);
|
|
else
|
|
f.mode = CLOSED;
|
|
f.mode_indent = indent;
|
|
break;
|
|
case Filepointer::UNIMPORTANT:
|
|
if (f.mode == CLOSED)
|
|
useClosedFileError(tok);
|
|
break;
|
|
case Filepointer::UNKNOWN_OP:
|
|
f.mode = UNKNOWN;
|
|
f.mode_indent = 0;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
if (operation != Filepointer::NONE && operation != Filepointer::UNIMPORTANT) {
|
|
f.op_indent = indent;
|
|
f.lastOperation = operation;
|
|
}
|
|
}
|
|
}
|
|
for (std::map<unsigned int, Filepointer>::iterator i = filepointers.begin(); i != filepointers.end(); ++i) {
|
|
i->second.op_indent = 0;
|
|
i->second.mode = UNKNOWN;
|
|
i->second.lastOperation = Filepointer::UNKNOWN_OP;
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckIO::fflushOnInputStreamError(const Token *tok, const std::string &varname)
|
|
{
|
|
reportError(tok, Severity::error,
|
|
"fflushOnInputStream", "fflush() called on input stream '" + varname + "' results in undefined behaviour.");
|
|
}
|
|
|
|
void CheckIO::ioWithoutPositioningError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::error,
|
|
"IOWithoutPositioning", "Read and write operations without a call to a positioning function (fseek, fsetpos or rewind) or fflush in between result in undefined behaviour.");
|
|
}
|
|
|
|
void CheckIO::readWriteOnlyFileError(const Token *tok)
|
|
{
|
|
|
|
reportError(tok, Severity::error,
|
|
"readWriteOnlyFile", "Read operation on a file that was opened only for writing.");
|
|
}
|
|
|
|
void CheckIO::writeReadOnlyFileError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::error,
|
|
"writeReadOnlyFile", "Write operation on a file that was opened only for reading.");
|
|
}
|
|
|
|
void CheckIO::useClosedFileError(const Token *tok)
|
|
{
|
|
reportError(tok, Severity::error,
|
|
"useClosedFile", "Used file that is not opened.");
|
|
}
|
|
|
|
|
|
//---------------------------------------------------------------------------
|
|
// scanf without field width limits can crash with huge input data
|
|
//---------------------------------------------------------------------------
|
|
void CheckIO::invalidScanf()
|
|
{
|
|
if (!_settings->isEnabled("warning") && !_settings->isEnabled("portability"))
|
|
return;
|
|
|
|
const SymbolDatabase * const symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
std::size_t functions = symbolDatabase->functionScopes.size();
|
|
for (std::size_t j = 0; j < functions; ++j) {
|
|
const Scope * scope = symbolDatabase->functionScopes[j];
|
|
for (const Token *tok = scope->classStart->next(); tok != scope->classEnd; tok = tok->next()) {
|
|
const Token *formatToken = 0;
|
|
if (Token::Match(tok, "scanf|vscanf ( %str% ,"))
|
|
formatToken = tok->tokAt(2);
|
|
else if (Token::Match(tok, "sscanf|vsscanf|fscanf|vfscanf (")) {
|
|
const Token* nextArg = tok->tokAt(2)->nextArgument();
|
|
if (nextArg && nextArg->type() == Token::eString)
|
|
formatToken = nextArg;
|
|
else
|
|
continue;
|
|
} else
|
|
continue;
|
|
|
|
bool format = false;
|
|
|
|
// scan the string backwards, so we dont need to keep states
|
|
const std::string &formatstr(formatToken->str());
|
|
for (unsigned int i = 1; i < formatstr.length(); i++) {
|
|
if (formatstr[i] == '%')
|
|
format = !format;
|
|
|
|
else if (!format)
|
|
continue;
|
|
|
|
else if (std::isdigit(formatstr[i]) || formatstr[i] == '*') {
|
|
format = false;
|
|
}
|
|
|
|
else if (std::isalpha(formatstr[i]) || formatstr[i] == '[') {
|
|
if ((formatstr[i] == 's' || formatstr[i] == '[' || formatstr[i] == 'S' || (formatstr[i] == 'l' && formatstr[i+1] == 's')) && _settings->isEnabled("warning")) // #3490 - field width limits are only necessary for string input
|
|
invalidScanfError(tok, false);
|
|
else if (formatstr[i] != 'n' && formatstr[i] != 'c' && _settings->platformType != Settings::Win32A && _settings->platformType != Settings::Win32W && _settings->platformType != Settings::Win64 && _settings->isEnabled("portability"))
|
|
invalidScanfError(tok, true); // Warn about libc bug in versions prior to 2.13-25
|
|
format = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckIO::invalidScanfError(const Token *tok, bool portability)
|
|
{
|
|
if (portability)
|
|
reportError(tok, Severity::portability,
|
|
"invalidscanf", "scanf without field width limits can crash with huge input data on some versions of libc.\n"
|
|
"scanf without field width limits can crash with huge input data on libc versions older than 2.13-25. Add a field "
|
|
"width specifier to fix this problem:\n"
|
|
" %i => %3i\n"
|
|
"\n"
|
|
"Sample program that can crash:\n"
|
|
"\n"
|
|
"#include <stdio.h>\n"
|
|
"int main()\n"
|
|
"{\n"
|
|
" int a;\n"
|
|
" scanf(\"%i\", &a);\n"
|
|
" return 0;\n"
|
|
"}\n"
|
|
"\n"
|
|
"To make it crash:\n"
|
|
"perl -e 'print \"5\"x2100000' | ./a.out");
|
|
else
|
|
reportError(tok, Severity::warning,
|
|
"invalidscanf", "scanf without field width limits can crash with huge input data.\n"
|
|
"scanf without field width limits can crash with huge input data. Add a field width "
|
|
"specifier to fix this problem:\n"
|
|
" %s => %20s\n"
|
|
"\n"
|
|
"Sample program that can crash:\n"
|
|
"\n"
|
|
"#include <stdio.h>\n"
|
|
"int main()\n"
|
|
"{\n"
|
|
" char c[5];\n"
|
|
" scanf(\"%s\", c);\n"
|
|
" return 0;\n"
|
|
"}\n"
|
|
"\n"
|
|
"To make it crash, type in more than 5 characters.");
|
|
}
|
|
|
|
//---------------------------------------------------------------------------
|
|
// printf("%u", "xyz"); // Wrong argument type
|
|
// printf("%u%s", 1); // Too few arguments
|
|
// printf("", 1); // Too much arguments
|
|
//---------------------------------------------------------------------------
|
|
static bool isComplexType(const Variable* var, const Token* varTypeTok)
|
|
{
|
|
if (var->type())
|
|
return (true);
|
|
|
|
static std::set<std::string> knownTypes;
|
|
if (knownTypes.empty()) {
|
|
knownTypes.insert("struct"); // If a type starts with the struct keyword, its a complex type
|
|
knownTypes.insert("string");
|
|
knownTypes.insert("wstring");
|
|
}
|
|
|
|
if (varTypeTok->str() == "std")
|
|
varTypeTok = varTypeTok->tokAt(2);
|
|
return ((knownTypes.find(varTypeTok->str()) != knownTypes.end() || (varTypeTok->strAt(1) == "<" && varTypeTok->linkAt(1) && varTypeTok->linkAt(1)->strAt(1) != "::")) && !var->isPointer() && !var->isArray());
|
|
}
|
|
|
|
static bool isKnownType(const Variable* var, const Token* varTypeTok)
|
|
{
|
|
return (varTypeTok->isStandardType() || varTypeTok->next()->isStandardType() || isComplexType(var, varTypeTok));
|
|
}
|
|
|
|
void CheckIO::checkWrongPrintfScanfArguments()
|
|
{
|
|
const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
|
|
bool warning = _settings->isEnabled("warning");
|
|
|
|
std::size_t functions = symbolDatabase->functionScopes.size();
|
|
for (std::size_t j = 0; j < functions; ++j) {
|
|
const Scope * scope = symbolDatabase->functionScopes[j];
|
|
for (const Token *tok = scope->classStart->next(); tok != scope->classEnd; tok = tok->next()) {
|
|
if (!tok->isName()) continue;
|
|
|
|
const Token* argListTok = 0; // Points to first va_list argument
|
|
std::string formatString;
|
|
|
|
if (Token::Match(tok->next(), "( %any%")) {
|
|
const Token *arg = tok->tokAt(2);
|
|
int argnr = 1;
|
|
while (arg) {
|
|
if (Token::Match(arg, "%str% [,)]") && _settings->library.isargformatstr(tok->str(),argnr)) {
|
|
formatString = arg->str();
|
|
if (arg->strAt(1) == ",")
|
|
argListTok = arg->tokAt(2);
|
|
else
|
|
argListTok = 0;
|
|
break;
|
|
}
|
|
|
|
arg = arg->nextArgument();
|
|
argnr++;
|
|
}
|
|
}
|
|
|
|
if (!formatString.empty()) {
|
|
/* formatstring found in library */
|
|
} else if (Token::Match(tok, "printf|scanf|wprintf|wscanf ( %str%")) {
|
|
formatString = tok->strAt(2);
|
|
if (tok->strAt(3) == ",") {
|
|
argListTok = tok->tokAt(4);
|
|
} else if (tok->strAt(3) == ")") {
|
|
argListTok = 0;
|
|
} else {
|
|
continue;
|
|
}
|
|
} else if (Token::Match(tok, "sprintf|fprintf|sscanf|fscanf|swscanf|fwprintf|fwscanf ( %any%") || (Token::simpleMatch(tok, "swprintf (") && Token::Match(tok->tokAt(2)->nextArgument(), "%str%"))) {
|
|
const Token* formatStringTok = tok->tokAt(2)->nextArgument(); // Find second parameter (format string)
|
|
if (Token::Match(formatStringTok, "%str% [,)]")) {
|
|
argListTok = formatStringTok->nextArgument(); // Find third parameter (first argument of va_args)
|
|
formatString = formatStringTok->str();
|
|
} else {
|
|
continue;
|
|
}
|
|
} else if (Token::Match(tok, "snprintf|fnprintf (") || (Token::simpleMatch(tok, "swprintf (") && !Token::Match(tok->tokAt(2)->nextArgument(), "%str%"))) {
|
|
const Token* formatStringTok = tok->tokAt(2);
|
|
for (int i = 0; i < 2 && formatStringTok; i++) {
|
|
formatStringTok = formatStringTok->nextArgument(); // Find third parameter (format string)
|
|
}
|
|
if (Token::Match(formatStringTok, "%str% [,)]")) {
|
|
argListTok = formatStringTok->nextArgument(); // Find fourth parameter (first argument of va_args)
|
|
formatString = formatStringTok->str();
|
|
} else {
|
|
continue;
|
|
}
|
|
} else {
|
|
continue;
|
|
}
|
|
|
|
// Count format string parameters..
|
|
bool scan = Token::Match(tok, "sscanf|fscanf|scanf|swscanf|fwscanf|wscanf");
|
|
unsigned int numFormat = 0;
|
|
bool percent = false;
|
|
const Token* argListTok2 = argListTok;
|
|
std::set<unsigned int> parameterPositionsUsed;
|
|
for (std::string::iterator i = formatString.begin(); i != formatString.end(); ++i) {
|
|
if (*i == '%') {
|
|
percent = !percent;
|
|
} else if (percent && *i == '[') {
|
|
while (i != formatString.end()) {
|
|
if (*i == ']') {
|
|
numFormat++;
|
|
if (argListTok)
|
|
argListTok = argListTok->nextArgument();
|
|
percent = false;
|
|
break;
|
|
}
|
|
++i;
|
|
}
|
|
if (i == formatString.end())
|
|
break;
|
|
} else if (percent) {
|
|
percent = false;
|
|
|
|
bool _continue = false;
|
|
std::string width;
|
|
unsigned int parameterPosition = 0;
|
|
bool hasParameterPosition = false;
|
|
while (i != formatString.end() && *i != ']' && !std::isalpha(*i)) {
|
|
if (*i == '*') {
|
|
if (scan)
|
|
_continue = true;
|
|
else {
|
|
numFormat++;
|
|
if (argListTok)
|
|
argListTok = argListTok->nextArgument();
|
|
}
|
|
} else if (std::isdigit(*i)) {
|
|
width += *i;
|
|
} else if (*i == '$') {
|
|
parameterPosition = static_cast<unsigned int>(std::atoi(width.c_str()));
|
|
hasParameterPosition = true;
|
|
width.clear();
|
|
}
|
|
++i;
|
|
}
|
|
if (i == formatString.end())
|
|
break;
|
|
if (_continue)
|
|
continue;
|
|
|
|
if (scan || *i != 'm') { // %m is a non-standard extension that requires no parameter on print functions.
|
|
++numFormat;
|
|
|
|
// Handle parameter positions (POSIX extension) - Ticket #4900
|
|
if (hasParameterPosition) {
|
|
if (parameterPositionsUsed.find(parameterPosition) == parameterPositionsUsed.end())
|
|
parameterPositionsUsed.insert(parameterPosition);
|
|
else // Parameter already referenced, hence don't consider it a new format
|
|
--numFormat;
|
|
}
|
|
|
|
// Perform type checks
|
|
if (argListTok && Token::Match(argListTok->next(), "[,)]")) { // We can currently only check the type of arguments matching this simple pattern.
|
|
const Variable *variableInfo = argListTok->variable();
|
|
const Token* varTypeTok = variableInfo ? variableInfo->typeStartToken() : NULL;
|
|
if (varTypeTok && varTypeTok->str() == "static")
|
|
varTypeTok = varTypeTok->next();
|
|
|
|
if (scan && varTypeTok) {
|
|
if (warning && ((!variableInfo->isPointer() && !variableInfo->isArray()) || varTypeTok->strAt(-1) == "const"))
|
|
invalidScanfArgTypeError(tok, tok->str(), numFormat);
|
|
|
|
if (*i == 's' && variableInfo && isKnownType(variableInfo, varTypeTok) && variableInfo->isArray() && (variableInfo->dimensions().size() == 1) && variableInfo->dimensions()[0].known) {
|
|
if (!width.empty()) {
|
|
int numWidth = std::atoi(width.c_str());
|
|
if (numWidth != (variableInfo->dimension(0) - 1))
|
|
invalidScanfFormatWidthError(tok, numFormat, numWidth, variableInfo);
|
|
}
|
|
}
|
|
} else if (!scan && warning) {
|
|
std::string specifier;
|
|
bool done = false;
|
|
while (!done) {
|
|
switch (*i) {
|
|
case 's':
|
|
if (variableInfo && argListTok->type() != Token::eString && isKnownType(variableInfo, varTypeTok) && (!variableInfo->isPointer() && !variableInfo->isArray()))
|
|
invalidPrintfArgTypeError_s(tok, numFormat);
|
|
done = true;
|
|
break;
|
|
case 'n':
|
|
if ((varTypeTok && isKnownType(variableInfo, varTypeTok) && ((!variableInfo->isPointer() && !variableInfo->isArray()) || varTypeTok->strAt(-1) == "const")) || argListTok->type() == Token::eString)
|
|
invalidPrintfArgTypeError_n(tok, numFormat);
|
|
done = true;
|
|
break;
|
|
case 'c':
|
|
case 'x':
|
|
case 'X':
|
|
case 'o':
|
|
if (varTypeTok && isKnownType(variableInfo, varTypeTok) && !Token::Match(varTypeTok, "bool|short|long|int|char|size_t") && !variableInfo->isPointer() && !variableInfo->isArray()) {
|
|
specifier += *i;
|
|
invalidPrintfArgTypeError_int(tok, numFormat, specifier);
|
|
} else if (argListTok->type() == Token::eString) {
|
|
specifier += *i;
|
|
invalidPrintfArgTypeError_int(tok, numFormat, specifier);
|
|
}
|
|
done = true;
|
|
break;
|
|
case 'd':
|
|
case 'i':
|
|
if (varTypeTok && isKnownType(variableInfo, varTypeTok) && !variableInfo->isPointer() && !variableInfo->isArray()) {
|
|
if ((varTypeTok->isUnsigned() || !Token::Match(varTypeTok, "bool|short|long|int")) && varTypeTok->str() != "char") {
|
|
specifier += *i;
|
|
invalidPrintfArgTypeError_sint(tok, numFormat, specifier);
|
|
}
|
|
} else if (argListTok->type() == Token::eString) {
|
|
specifier += *i;
|
|
invalidPrintfArgTypeError_sint(tok, numFormat, specifier);
|
|
}
|
|
done = true;
|
|
break;
|
|
case 'u':
|
|
if (varTypeTok && isKnownType(variableInfo, varTypeTok) && !variableInfo->isPointer() && !variableInfo->isArray()) {
|
|
if ((!varTypeTok->isUnsigned() || !Token::Match(varTypeTok, "char|short|long|int|size_t")) && varTypeTok->str() != "bool") {
|
|
specifier += *i;
|
|
invalidPrintfArgTypeError_uint(tok, numFormat, specifier);
|
|
}
|
|
} else if (argListTok->type() == Token::eString) {
|
|
specifier += *i;
|
|
invalidPrintfArgTypeError_uint(tok, numFormat, specifier);
|
|
}
|
|
done = true;
|
|
break;
|
|
case 'p':
|
|
if (varTypeTok && isKnownType(variableInfo, varTypeTok) && !Token::Match(varTypeTok, "short|long|int|size_t") && !variableInfo->isPointer() && !variableInfo->isArray())
|
|
invalidPrintfArgTypeError_p(tok, numFormat);
|
|
else if (argListTok->type() == Token::eString)
|
|
invalidPrintfArgTypeError_p(tok, numFormat);
|
|
done = true;
|
|
break;
|
|
case 'e':
|
|
case 'E':
|
|
case 'f':
|
|
case 'g':
|
|
case 'G':
|
|
if (varTypeTok && ((isKnownType(variableInfo, varTypeTok) && !Token::Match(varTypeTok, "float|double")) || variableInfo->isPointer() || variableInfo->isArray())) {
|
|
specifier += *i;
|
|
invalidPrintfArgTypeError_float(tok, numFormat, specifier);
|
|
} else if (argListTok->type() == Token::eString) {
|
|
specifier += *i;
|
|
invalidPrintfArgTypeError_float(tok, numFormat, specifier);
|
|
}
|
|
done = true;
|
|
break;
|
|
case 'h': // Can be 'hh' (signed char or unsigned char) or 'h' (short int or unsigned short int)
|
|
case 'l': // Can be 'll' (long long int or unsigned long long int) or 'l' (long int or unsigned long int)
|
|
// If the next character is the same (which makes 'hh' or 'll') then expect another alphabetical character
|
|
if (i != formatString.end() && *(i+1) == *i) {
|
|
if (i+1 != formatString.end()) {
|
|
if (!isalpha(*(i+2))) {
|
|
std::string modifier;
|
|
modifier += *i;
|
|
modifier += *(i+1);
|
|
invalidLengthModifierError(tok, numFormat, modifier);
|
|
done = true;
|
|
} else {
|
|
specifier = *i++;
|
|
specifier += *i++;
|
|
}
|
|
} else {
|
|
done = true;
|
|
}
|
|
} else {
|
|
if (i != formatString.end()) {
|
|
if (!isalpha(*(i+1))) {
|
|
std::string modifier;
|
|
modifier += *i;
|
|
invalidLengthModifierError(tok, numFormat, modifier);
|
|
done = true;
|
|
} else {
|
|
specifier = *i++;
|
|
}
|
|
} else {
|
|
done = true;
|
|
}
|
|
}
|
|
break;
|
|
case 'I': // Microsoft extension: I for size_t and ptrdiff_t, I32 for __int32, and I64 for __int64
|
|
if (i != formatString.end()) {
|
|
if (isalpha(*(i+1))) {
|
|
specifier = *i++;
|
|
} else if (*(i+1) == '3' && *(i+2) == '2' && isalpha(*(i+3))) {
|
|
specifier = *i++;
|
|
specifier += *i++;
|
|
specifier += *i++;
|
|
} else if (*(i+1) == '6' && *(i+2) == '4' && isalpha(*(i+3))) {
|
|
specifier = *i++;
|
|
specifier += *i++;
|
|
specifier += *i++;
|
|
}
|
|
}
|
|
break;
|
|
case 'j': // intmax_t or uintmax_t
|
|
case 'z': // size_t
|
|
case 't': // ptrdiff_t
|
|
case 'L': // long double
|
|
// Expect an alphabetical character after these specifiers
|
|
if (i != formatString.end() && !isalpha(*(i+1))) {
|
|
std::string modifier;
|
|
modifier += *i;
|
|
invalidLengthModifierError(tok, numFormat, modifier);
|
|
done = true;
|
|
} else {
|
|
specifier = *i++;
|
|
}
|
|
break;
|
|
default:
|
|
done = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (argListTok)
|
|
argListTok = argListTok->nextArgument(); // Find next argument
|
|
}
|
|
}
|
|
}
|
|
|
|
// Count printf/scanf parameters..
|
|
unsigned int numFunction = 0;
|
|
while (argListTok2) {
|
|
numFunction++;
|
|
argListTok2 = argListTok2->nextArgument(); // Find next argument
|
|
}
|
|
|
|
// Check that all parameter positions reference an actual parameter
|
|
for (std::set<unsigned int>::const_iterator it = parameterPositionsUsed.begin() ; it != parameterPositionsUsed.end() ; ++it) {
|
|
if (((*it == 0) || (*it > numFormat)) && _settings->isEnabled("warning"))
|
|
wrongPrintfScanfPosixParameterPositionError(tok, tok->str(), *it, numFormat);
|
|
}
|
|
|
|
// Mismatching number of parameters => warning
|
|
if (numFormat != numFunction)
|
|
wrongPrintfScanfArgumentsError(tok, tok->str(), numFormat, numFunction);
|
|
}
|
|
}
|
|
}
|
|
|
|
void CheckIO::wrongPrintfScanfArgumentsError(const Token* tok,
|
|
const std::string &functionName,
|
|
unsigned int numFormat,
|
|
unsigned int numFunction)
|
|
{
|
|
Severity::SeverityType severity = numFormat > numFunction ? Severity::error : Severity::warning;
|
|
if (severity != Severity::error && !_settings->isEnabled("style"))
|
|
return;
|
|
|
|
std::ostringstream errmsg;
|
|
errmsg << functionName
|
|
<< " format string has "
|
|
<< numFormat
|
|
<< " parameters but "
|
|
<< (numFormat > numFunction ? "only " : "")
|
|
<< numFunction
|
|
<< " are given.";
|
|
|
|
reportError(tok, severity, "wrongPrintfScanfArgNum", errmsg.str());
|
|
}
|
|
|
|
void CheckIO::wrongPrintfScanfPosixParameterPositionError(const Token* tok, const std::string& functionName,
|
|
unsigned int index, unsigned int numFunction)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << functionName << ": ";
|
|
if (index == 0) {
|
|
errmsg << "parameter positions start at 1, not 0";
|
|
} else {
|
|
errmsg << "referencing parameter " << index << " while " << numFunction << " arguments given";
|
|
}
|
|
reportError(tok, Severity::warning, "wrongPrintfScanfParameterPositionError", errmsg.str());
|
|
}
|
|
|
|
void CheckIO::invalidScanfArgTypeError(const Token* tok, const std::string &functionName, unsigned int numFormat)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << functionName << " argument no. " << numFormat << ": requires a non-const pointer or array as argument.";
|
|
reportError(tok, Severity::warning, "invalidScanfArgType", errmsg.str());
|
|
}
|
|
void CheckIO::invalidPrintfArgTypeError_s(const Token* tok, unsigned int numFormat)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "%s in format string (no. " << numFormat << ") requires a char* given in the argument list.";
|
|
reportError(tok, Severity::warning, "invalidPrintfArgType_s", errmsg.str());
|
|
}
|
|
void CheckIO::invalidPrintfArgTypeError_n(const Token* tok, unsigned int numFormat)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "%n in format string (no. " << numFormat << ") requires a pointer to an non-const integer given in the argument list.";
|
|
reportError(tok, Severity::warning, "invalidPrintfArgType_n", errmsg.str());
|
|
}
|
|
void CheckIO::invalidPrintfArgTypeError_p(const Token* tok, unsigned int numFormat)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "%p in format string (no. " << numFormat << ") requires an address given in the argument list.";
|
|
reportError(tok, Severity::warning, "invalidPrintfArgType_p", errmsg.str());
|
|
}
|
|
void CheckIO::invalidPrintfArgTypeError_int(const Token* tok, unsigned int numFormat, const std::string& specifier)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "%" << specifier << " in format string (no. " << numFormat << ") requires an integer given in the argument list.";
|
|
reportError(tok, Severity::warning, "invalidPrintfArgType_int", errmsg.str());
|
|
}
|
|
void CheckIO::invalidPrintfArgTypeError_uint(const Token* tok, unsigned int numFormat, const std::string& specifier)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "%" << specifier << " in format string (no. " << numFormat << ") requires an unsigned integer given in the argument list.";
|
|
reportError(tok, Severity::warning, "invalidPrintfArgType_uint", errmsg.str());
|
|
}
|
|
void CheckIO::invalidPrintfArgTypeError_sint(const Token* tok, unsigned int numFormat, const std::string& specifier)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "%" << specifier << " in format string (no. " << numFormat << ") requires a signed integer given in the argument list.";
|
|
reportError(tok, Severity::warning, "invalidPrintfArgType_sint", errmsg.str());
|
|
}
|
|
void CheckIO::invalidPrintfArgTypeError_float(const Token* tok, unsigned int numFormat, const std::string& specifier)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "%" << specifier << " in format string (no. " << numFormat << ") requires a floating point number given in the argument list.";
|
|
reportError(tok, Severity::warning, "invalidPrintfArgType_float", errmsg.str());
|
|
}
|
|
void CheckIO::invalidLengthModifierError(const Token* tok, unsigned int numFormat, const std::string& modifier)
|
|
{
|
|
std::ostringstream errmsg;
|
|
errmsg << "'" << modifier << "' in format string (no. " << numFormat << ") is a length modifier and cannot be used without a conversion specifier.";
|
|
reportError(tok, Severity::warning, "invalidLengthModifierError", errmsg.str());
|
|
}
|
|
|
|
void CheckIO::invalidScanfFormatWidthError(const Token* tok, unsigned int numFormat, int width, const Variable *var)
|
|
{
|
|
std::ostringstream errmsg;
|
|
Severity::SeverityType severity = Severity::warning;
|
|
bool inconclusive = false;
|
|
|
|
if (var) {
|
|
if (var->dimension(0) > width) {
|
|
if (!_settings->inconclusive)
|
|
return;
|
|
inconclusive = true;
|
|
errmsg << "Width " << width << " given in format string (no. " << numFormat << ") is smaller than destination buffer"
|
|
<< " '" << var->name() << "[" << var->dimension(0) << "]'.";
|
|
} else {
|
|
errmsg << "Width " << width << " given in format string (no. " << numFormat << ") is larger than destination buffer '"
|
|
<< var->name() << "[" << var->dimension(0) << "]', use %" << (var->dimension(0) - 1) << "s to prevent overflowing it.";
|
|
severity = Severity::error;
|
|
}
|
|
|
|
} else
|
|
errmsg << "Width " << width << " given in format string (no. " << numFormat << ") doesn't match destination buffer.";
|
|
|
|
if (severity == Severity::error || _settings->isEnabled("style"))
|
|
reportError(tok, severity, "invalidScanfFormatWidth", errmsg.str(), inconclusive);
|
|
}
|