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1912 lines (1814 loc) · 111 KB
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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2014 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 "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];
for (const Token *tok = scope->classStart; tok && tok != scope->classEnd; tok = tok->next()) {
if (Token::Match(tok, "std :: cout|cerr !!.") && tok->next()->astParent() && tok->next()->astParent()->astOperand1() == tok->next()) {
const Token* tok2 = tok->next();
while (tok2->astParent() && tok2->astParent()->str() == "<<") {
tok2 = tok2->astParent();
if (tok2->astOperand2() && Token::Match(tok2->astOperand2()->previous(), "std :: cout|cerr"))
coutCerrMisusageError(tok, tok2->astOperand2()->strAt(1));
}
}
}
}
}
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_OM };
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_OM;
}
struct Filepointer {
OpenMode mode;
unsigned int mode_indent;
enum Operation {NONE, UNIMPORTANT, READ, WRITE, POSITIONING, OPEN, CLOSE, UNKNOWN_OP} lastOperation;
unsigned int op_indent;
enum AppendMode { UNKNOWN_AM, APPEND, APPEND_EX };
AppendMode append_mode;
Filepointer(OpenMode mode_ = UNKNOWN_OM)
: mode(mode_), mode_indent(0), lastOperation(NONE), op_indent(0), append_mode(UNKNOWN_AM) {
}
};
void CheckIO::checkFileUsage()
{
static const char* _whitelist[] = {
"clearerr", "feof", "ferror", "fgetpos", "ftell", "setbuf", "setvbuf", "ungetc", "ungetwc"
};
static const std::set<std::string> whitelist(_whitelist, _whitelist + sizeof(_whitelist)/sizeof(*_whitelist));
const bool windows = _settings->isWindowsPlatform();
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_OM)));
else
filepointers.insert(std::make_pair(var->declarationId(), Filepointer(CLOSED)));
} else {
filepointers.insert(std::make_pair(var->declarationId(), Filepointer(UNKNOWN_OM)));
// 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_OM;
}
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_OM;
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" &&
(windows ? (tok->str() != "_wfopen" && tok->str() != "_wfreopen") : true))) {
std::map<unsigned int, Filepointer>::iterator i = filepointers.find(tok->varId());
if (i != filepointers.end()) {
i->second.mode = UNKNOWN_OM;
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" ||
(windows && (tok->str() == "_wfopen" || tok->str() == "_wfreopen"))) &&
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 (windows && Token::Match(tok, "fopen_s|freopen_s|_wfopen_s|_wfreopen_s ( & %var%")) {
const Token* modeTok = tok->tokAt(2)->nextArgument()->nextArgument();
if (modeTok && modeTok->type() == Token::eString)
mode = modeTok->strValue();
fileTok = tok->tokAt(3);
operation = Filepointer::OPEN;
} else if ((tok->str() == "rewind" || tok->str() == "fseek" || tok->str() == "fsetpos" || tok->str() == "fflush") ||
(windows && tok->str() == "_fseeki64")) {
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() == "fgetwc" ||
tok->str() == "fgets" || tok->str() == "fgetws" || tok->str() == "fread" ||
tok->str() == "fscanf" || tok->str() == "fwscanf" || tok->str() == "getc" ||
(windows && (tok->str() == "fscanf_s" || tok->str() == "fwscanf_s"))) {
if (tok->str().find("scanf") != std::string::npos)
fileTok = tok->tokAt(2);
else
fileTok = tok->linkAt(1)->previous();
operation = Filepointer::READ;
} else if (tok->str() == "fputc" || tok->str() == "fputwc" ||
tok->str() == "fputs" || tok->str() == "fputws" || tok->str() == "fwrite" ||
tok->str() == "fprintf" || tok->str() == "fwprintf" || tok->str() == "putcc" ||
(windows && (tok->str() == "fprintf_s" || tok->str() == "fwprintf_s"))) {
if (tok->str().find("printf") != std::string::npos)
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" || tok->str() == "ungetwc") && 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_OM)));
}
Filepointer& f = filepointers[fileTok->varId()];
switch (operation) {
case Filepointer::OPEN:
f.mode = getMode(mode);
if (mode.find('a') != std::string::npos) {
if (f.mode == RW_MODE)
f.append_mode = Filepointer::APPEND_EX;
else
f.append_mode = Filepointer::APPEND;
}
f.mode_indent = indent;
break;
case Filepointer::POSITIONING:
if (f.mode == CLOSED)
useClosedFileError(tok);
else if (f.append_mode == Filepointer::APPEND && tok->str() != "fflush" && _settings->isEnabled("warning"))
seekOnAppendedFileError(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_OM;
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_OM;
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.");
}
void CheckIO::seekOnAppendedFileError(const Token *tok)
{
reportError(tok, Severity::warning,
"seekOnAppendedFile", "Repositioning operation performed on a file opened in append mode has no effect.");
}
//---------------------------------------------------------------------------
// scanf without field width limits can crash with huge input data
//---------------------------------------------------------------------------
void CheckIO::invalidScanf()
{
if (!_settings->isEnabled("warning") && !_settings->isEnabled("portability"))
return;
const bool windows = _settings->isWindowsPlatform();
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 = nullptr;
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 do not 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((unsigned char)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' && !windows && _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 findFormat(unsigned int arg, const Token *firstArg,
const Token **formatStringTok, const Token **formatArgTok)
{
const Token* argTok = firstArg;
for (unsigned int i = 0; i < arg && argTok; ++i)
argTok = argTok->nextArgument();
if (Token::Match(argTok, "%str% [,)]")) {
*formatArgTok = argTok->nextArgument();
*formatStringTok = argTok;
return true;
} else if (Token::Match(argTok, "%var% [,)]") &&
(argTok->variable() &&
Token::Match(argTok->variable()->typeStartToken(), "char|wchar_t") &&
(argTok->variable()->isPointer() ||
(argTok->variable()->dimensions().size() == 1 &&
argTok->variable()->dimensionKnown(0) &&
argTok->variable()->dimension(0) != 0)))) {
*formatArgTok = argTok->nextArgument();
*formatStringTok = nullptr;
if (argTok->variable()) {
const Token *varTok = argTok->variable()->nameToken();
if (Token::Match(varTok, "%var% ; %var% = %str% ;") &&
varTok->str() == varTok->strAt(2) &&
Token::Match(varTok->tokAt(-4), "const char|wchar_t * const")) {
*formatStringTok = varTok->tokAt(4);
} else if (Token::Match(varTok, "%var% [ %num% ] = %str% ;") &&
Token::Match(varTok->tokAt(-2), "const char|wchar_t")) {
*formatStringTok = varTok->tokAt(5);
}
}
return true;
}
return false;
}
// Utility function returning whether iToTest equals iTypename or iOptionalPrefix+iTypename
inline bool typesMatch(const std::string& iToTest, const std::string& iTypename, const std::string& iOptionalPrefix = "std::")
{
return (iToTest == iTypename) || (iToTest == iOptionalPrefix + iTypename);
}
void CheckIO::checkWrongPrintfScanfArguments()
{
const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();
const bool warning = _settings->isEnabled("warning");
const bool windows = _settings->isWindowsPlatform();
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
const Token* formatStringTok = 0; // Points to format string token
std::string formatString;
bool scan = false;
bool scanf_s = false;
int formatStringArgNo = -1;
if (Token::Match(tok->next(), "( %any%") && _settings->library.formatstr_function(tok->str())) {
const std::map<int, Library::ArgumentChecks>& argumentChecks = _settings->library.argumentChecks.at(tok->str());
for (std::map<int, Library::ArgumentChecks>::const_iterator i = argumentChecks.begin(); i != argumentChecks.end(); ++i) {
if (i->second.formatstr) {
formatStringArgNo = i->first - 1;
break;
}
}
scan = _settings->library.formatstr_scan(tok->str());
scanf_s = _settings->library.formatstr_secure(tok->str());
}
if (formatStringArgNo >= 0) {
// formatstring found in library. Find format string and first argument belonging to format string.
if (!findFormat(formatStringArgNo, tok->tokAt(2), &formatStringTok, &argListTok))
continue;
} else if (windows && Token::Match(tok, "Format|AppendFormat (") &&
Token::Match(tok->tokAt(-2), "%var% .") && tok->tokAt(-2)->variable() &&
tok->tokAt(-2)->variable()->typeStartToken()->str() == "CString") {
// Find second parameter and format string
if (!findFormat(0, tok->tokAt(2), &formatStringTok, &argListTok))
continue;
} else if (Token::simpleMatch(tok, "swprintf (") && Token::Match(tok->tokAt(2)->nextArgument(), "%str%")) {
// Find third parameter and format string
if (!findFormat(1, tok->tokAt(2), &formatStringTok, &argListTok))
continue;
} else if (Token::simpleMatch(tok, "swprintf (") && !Token::Match(tok->tokAt(2)->nextArgument(), "%str%")) {
// Find forth parameter and format string
if (!findFormat(2, tok->tokAt(2), &formatStringTok, &argListTok))
continue;
} else if (windows && Token::Match(tok, "sprintf_s|swprintf_s (")) {
// template <size_t size> int sprintf_s(char (&buffer)[size], const char *format, ...);
if (findFormat(1, tok->tokAt(2), &formatStringTok, &argListTok)) {
if (!formatStringTok)
continue;
}
// int sprintf_s(char *buffer, size_t sizeOfBuffer, const char *format, ...);
else if (findFormat(2, tok->tokAt(2), &formatStringTok, &argListTok)) {
if (!formatStringTok)
continue;
}
} else if (windows && Token::Match(tok, "_snprintf_s|_snwprintf_s (")) {
// template <size_t size> int _snprintf_s(char (&buffer)[size], size_t count, const char *format, ...);
if (findFormat(2, tok->tokAt(2), &formatStringTok, &argListTok)) {
if (!formatStringTok)
continue;
}
// int _snprintf_s(char *buffer, size_t sizeOfBuffer, size_t count, const char *format, ...);
else if (findFormat(3, tok->tokAt(2), &formatStringTok, &argListTok)) {
if (!formatStringTok)
continue;
}
} else {
continue;
}
if (formatStringTok)
formatString = formatStringTok->str();
else
continue;
// Count format string parameters..
unsigned int numFormat = 0;
unsigned int numSecure = 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 (scanf_s) {
numSecure++;
if (argListTok) {
argListTok = argListTok->nextArgument();
}
}
if (i == formatString.end())
break;
} else if (percent) {
percent = false;
bool _continue = false;
bool skip = false;
std::string width;
unsigned int parameterPosition = 0;
bool hasParameterPosition = false;
while (i != formatString.end() && *i != '[' && !std::isalpha((unsigned char)*i)) {
if (*i == '*') {
skip = true;
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() && *i == '[') {
while (i != formatString.end()) {
if (*i == ']') {
if (!skip) {
numFormat++;
if (argListTok)
argListTok = argListTok->nextArgument();
}
break;
}
++i;
}
if (scanf_s && !skip) {
numSecure++;
if (argListTok) {
argListTok = argListTok->nextArgument();
}
}
_continue = true;
}
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
ArgumentInfo argInfo(argListTok, _settings);
if (argInfo.typeToken && !argInfo.isLibraryType(_settings)) {
if (scan) {
std::string specifier;
bool done = false;
while (!done) {
switch (*i) {
case 's':
specifier += *i;
if (argInfo.variableInfo && argInfo.isKnownType() && argInfo.variableInfo->isArray() && (argInfo.variableInfo->dimensions().size() == 1) && argInfo.variableInfo->dimensions()[0].known) {
if (!width.empty()) {
int numWidth = std::atoi(width.c_str());
if (numWidth != (argInfo.variableInfo->dimension(0) - 1))
invalidScanfFormatWidthError(tok, numFormat, numWidth, argInfo.variableInfo);
}
}
if (argListTok && argListTok->type() != Token::eString &&
argInfo.isKnownType() && argInfo.isArrayOrPointer() &&
(!Token::Match(argInfo.typeToken, "char|wchar_t") ||
argInfo.typeToken->strAt(-1) == "const")) {
if (!(argInfo.isArrayOrPointer() && argInfo.element && !argInfo.typeToken->isStandardType()))
invalidScanfArgTypeError_s(tok, numFormat, specifier, &argInfo);
}
if (scanf_s) {
numSecure++;
if (argListTok) {
argListTok = argListTok->nextArgument();
}
}
done = true;
break;
case 'c':
if (scanf_s) {
numSecure++;
if (argListTok) {
argListTok = argListTok->nextArgument();
}
}
done = true;
break;
case 'x':
case 'X':
case 'o':
specifier += *i;
if (argInfo.typeToken->type() == Token::eString)
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
else if (argInfo.isKnownType()) {
if (!Token::Match(argInfo.typeToken, "char|short|int|long")) {
if (argInfo.typeToken->isStandardType() || !argInfo.element)
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else if (!argInfo.isArrayOrPointer() ||
argInfo.typeToken->strAt(-1) == "const") {
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else {
switch (specifier[0]) {
case 'h':
if (specifier[1] == 'h') {
if (argInfo.typeToken->str() != "char")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else if (argInfo.typeToken->str() != "short")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 'l':
if (specifier[1] == 'l') {
if (argInfo.typeToken->str() != "long" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
else if (typesMatch(argInfo.typeToken->originalName(), "size_t") ||
typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t") ||
typesMatch(argInfo.typeToken->originalName(), "intmax_t", "u"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else if (argInfo.typeToken->str() != "long" || argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
else if (typesMatch(argInfo.typeToken->originalName(), "size_t") ||
typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t") ||
typesMatch(argInfo.typeToken->originalName(), "intmax_t", "u"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 'I':
if (specifier.find("I64") != std::string::npos) {
if (argInfo.typeToken->str() != "long" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else if (specifier.find("I32") != std::string::npos) {
if (argInfo.typeToken->str() != "int" || argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else if (!typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t") &&
!typesMatch(argInfo.typeToken->originalName(), "size_t"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 'j':
if (argInfo.typeToken->originalName() != "uintmax_t")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 'z':
if (!typesMatch(argInfo.typeToken->originalName(), "size_t"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 't':
if (!typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 'L':
if (argInfo.typeToken->str() != "long" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
default:
if (argInfo.typeToken->str() != "int")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
else if (typesMatch(argInfo.typeToken->originalName(), "size_t") ||
typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t") ||
typesMatch(argInfo.typeToken->originalName(), "intmax_t", "u"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
}
}
}
done = true;
break;
case 'n':
case 'd':
case 'i':
specifier += *i;
if (argInfo.typeToken->type() == Token::eString)
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
else if (argInfo.isKnownType()) {
if (!Token::Match(argInfo.typeToken, "char|short|int|long")) {
if (argInfo.typeToken->isStandardType() || !argInfo.element)
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
} else if (argInfo.typeToken->isUnsigned() ||
!argInfo.isArrayOrPointer() ||
argInfo.typeToken->strAt(-1) == "const") {
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
} else {
switch (specifier[0]) {
case 'h':
if (specifier[1] == 'h') {
if (argInfo.typeToken->str() != "char")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
} else if (argInfo.typeToken->str() != "short")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
break;
case 'l':
if (specifier[1] == 'l') {
if (argInfo.typeToken->str() != "long" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
else if (typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t") ||
argInfo.typeToken->originalName() == "intmax_t")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
} else if (argInfo.typeToken->str() != "long" || argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
else if (typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t") ||
argInfo.typeToken->originalName() == "intmax_t")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
break;
case 'I':
if (specifier.find("I64") != std::string::npos) {
if (argInfo.typeToken->str() != "long" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
} else if (specifier.find("I32") != std::string::npos) {
if (argInfo.typeToken->str() != "int" || argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
} else if (!typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
break;
case 'j':
if (argInfo.typeToken->originalName() != "intmax_t")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
break;
case 'z':
if (!typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t") &&
!typesMatch(argInfo.typeToken->originalName(), "ssize_t"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
break;
case 't':
if (!typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
break;
case 'L':
if (argInfo.typeToken->str() != "long" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
break;
default:
if (argInfo.typeToken->str() != "int")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
else if (typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t") ||
argInfo.typeToken->originalName() == "intmax_t")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, false);
break;
}
}
}
done = true;
break;
case 'u':
specifier += *i;
if (argInfo.typeToken->type() == Token::eString)
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
else if (argInfo.isKnownType()) {
if (!Token::Match(argInfo.typeToken, "char|short|int|long")) {
if (argInfo.typeToken->isStandardType() || !argInfo.element)
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else if (!argInfo.typeToken->isUnsigned() ||
!argInfo.isArrayOrPointer() ||
argInfo.typeToken->strAt(-1) == "const") {
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else {
switch (specifier[0]) {
case 'h':
if (specifier[1] == 'h') {
if (argInfo.typeToken->str() != "char")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else if (argInfo.typeToken->str() != "short")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 'l':
if (specifier[1] == 'l') {
if (argInfo.typeToken->str() != "long" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
else if (typesMatch(argInfo.typeToken->originalName(), "size_t") ||
argInfo.typeToken->originalName() == "uintmax_t")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else if (argInfo.typeToken->str() != "long" || argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
else if (typesMatch(argInfo.typeToken->originalName(), "size_t") ||
argInfo.typeToken->originalName() == "uintmax_t")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 'I':
if (specifier.find("I64") != std::string::npos) {
if (argInfo.typeToken->str() != "long" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else if (specifier.find("I32") != std::string::npos) {
if (argInfo.typeToken->str() != "int" || argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
} else if (!typesMatch(argInfo.typeToken->originalName(), "size_t"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 'j':
if (argInfo.typeToken->originalName() != "uintmax_t")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 'z':
if (!typesMatch(argInfo.typeToken->originalName(), "size_t"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 't':
if (!typesMatch(argInfo.typeToken->originalName(), "ptrdiff_t"))
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
case 'L':
if (argInfo.typeToken->str() != "long" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
else if (typesMatch(argInfo.typeToken->originalName(), "size_t") ||
argInfo.typeToken->originalName() == "uintmax_t")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
default:
if (argInfo.typeToken->str() != "int")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
else if (typesMatch(argInfo.typeToken->originalName(), "size_t") ||
typesMatch(argInfo.typeToken->originalName(), "ssize_t") ||
argInfo.typeToken->originalName() == "uintmax_t")
invalidScanfArgTypeError_int(tok, numFormat, specifier, &argInfo, true);
break;
}
}
}
done = true;
break;
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
case 'a':
specifier += *i;
if (argInfo.typeToken->type() == Token::eString)
invalidScanfArgTypeError_float(tok, numFormat, specifier, &argInfo);
else if (argInfo.isKnownType()) {
if (!Token::Match(argInfo.typeToken, "float|double")) {
if (argInfo.typeToken->isStandardType())
invalidScanfArgTypeError_float(tok, numFormat, specifier, &argInfo);
} else if (!argInfo.isArrayOrPointer() ||
argInfo.typeToken->strAt(-1) == "const") {
invalidScanfArgTypeError_float(tok, numFormat, specifier, &argInfo);
} else {
switch (specifier[0]) {
case 'l':
if (specifier[1] == 'l') {
if (argInfo.typeToken->str() != "double" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_float(tok, numFormat, specifier, &argInfo);
} else if (argInfo.typeToken->str() != "double" || argInfo.typeToken->isLong())
invalidScanfArgTypeError_float(tok, numFormat, specifier, &argInfo);
break;
case 'L':
if (argInfo.typeToken->str() != "double" || !argInfo.typeToken->isLong())
invalidScanfArgTypeError_float(tok, numFormat, specifier, &argInfo);
break;
default:
if (argInfo.typeToken->str() != "float")
invalidScanfArgTypeError_float(tok, numFormat, specifier, &argInfo);
break;
}
}
}
done = true;
break;
case 'I':
if ((i+1 != formatString.end() && *(i+1) == '6' &&
i+2 != formatString.end() && *(i+2) == '4') ||
(i+1 != formatString.end() && *(i+1) == '3' &&
i+2 != formatString.end() && *(i+2) == '2')) {
specifier += *i++;
specifier += *i++;
if ((i+1) != formatString.end() && !isalpha(*(i+1))) {
specifier += *i;
invalidLengthModifierError(tok, numFormat, specifier);
done = true;
} else {
specifier += *i++;
}
} else {
if ((i+1) != formatString.end() && !isalpha(*(i+1))) {
specifier += *i;
invalidLengthModifierError(tok, numFormat, specifier);
done = true;
} else {
specifier += *i++;
}
}
break;
case 'h':
case 'l':
if (i+1 != formatString.end() && *(i+1) == *i)
specifier += *i++;
// fallthrough
case 'j':
case 'q':
case 't':
case 'z':
case 'L':
// Expect an alphabetical character after these specifiers
if (i != formatString.end() && !isalpha(*(i+1))) {
specifier += *i;
invalidLengthModifierError(tok, numFormat, specifier);
done = true;
} else {
specifier += *i++;