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//===----- FormatStringParsing.h - Format String Parsing --------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This provides some shared functions between printf and scanf format string
// parsing code.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_LIB_ANALYSIS_FORMATSTRINGPARSING_H
#define LLVM_CLANG_LIB_ANALYSIS_FORMATSTRINGPARSING_H
#include "clang/AST/ASTContext.h"
#include "clang/AST/Type.h"
#include "clang/AST/FormatString.h"
namespace clang {
class LangOptions;
template <typename T>
class UpdateOnReturn {
T &ValueToUpdate;
const T &ValueToCopy;
public:
UpdateOnReturn(T &valueToUpdate, const T &valueToCopy)
: ValueToUpdate(valueToUpdate), ValueToCopy(valueToCopy) {}
~UpdateOnReturn() {
ValueToUpdate = ValueToCopy;
}
};
namespace analyze_format_string {
OptionalAmount ParseAmount(const char *&Beg, const char *E);
OptionalAmount ParseNonPositionAmount(const char *&Beg, const char *E,
unsigned &argIndex);
OptionalAmount ParsePositionAmount(FormatStringHandler &H,
const char *Start, const char *&Beg,
const char *E, PositionContext p);
bool ParseFieldWidth(FormatStringHandler &H,
FormatSpecifier &CS,
const char *Start, const char *&Beg, const char *E,
unsigned *argIndex);
bool ParseArgPosition(FormatStringHandler &H,
FormatSpecifier &CS, const char *Start,
const char *&Beg, const char *E);
bool ParseVectorModifier(FormatStringHandler &H,
FormatSpecifier &FS, const char *&Beg, const char *E,
const LangOptions &LO);
/// Returns true if a LengthModifier was parsed and installed in the
/// FormatSpecifier& argument, and false otherwise.
bool ParseLengthModifier(FormatSpecifier &FS, const char *&Beg, const char *E,
const LangOptions &LO, bool IsScanf = false);
/// Returns true if the invalid specifier in \p SpecifierBegin is a UTF-8
/// string; check that it won't go further than \p FmtStrEnd and write
/// up the total size in \p Len.
bool ParseUTF8InvalidSpecifier(const char *SpecifierBegin,
const char *FmtStrEnd, unsigned &Len);
template <typename T> class SpecifierResult {
T FS;
const char *Start;
bool Stop;
public:
SpecifierResult(bool stop = false)
: Start(nullptr), Stop(stop) {}
SpecifierResult(const char *start,
const T &fs)
: FS(fs), Start(start), Stop(false) {}
const char *getStart() const { return Start; }
bool shouldStop() const { return Stop; }
bool hasValue() const { return Start != nullptr; }
const T &getValue() const {
assert(hasValue());
return FS;
}
const T &getValue() { return FS; }
};
} // end analyze_format_string namespace
} // end clang namespace
#endif
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