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// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_OSTREAMS_H_
#define V8_OSTREAMS_H_
#include <cstddef>
#include <cstdio>
#include <cstring>
#include <ostream> // NOLINT
#include <streambuf>
#include "include/v8config.h"
#include "src/base/macros.h"
#include "src/globals.h"
namespace v8 {
namespace internal {
class OFStreamBase : public std::streambuf {
public:
explicit OFStreamBase(FILE* f);
virtual ~OFStreamBase();
protected:
FILE* const f_;
virtual int sync();
virtual int_type overflow(int_type c);
virtual std::streamsize xsputn(const char* s, std::streamsize n);
};
// An output stream writing to a file.
class V8_EXPORT_PRIVATE OFStream : public std::ostream {
public:
explicit OFStream(FILE* f);
virtual ~OFStream();
private:
OFStreamBase buf_;
};
// Wrappers to disambiguate uint16_t and uc16.
struct AsUC16 {
explicit AsUC16(uint16_t v) : value(v) {}
uint16_t value;
};
struct AsUC32 {
explicit AsUC32(int32_t v) : value(v) {}
int32_t value;
};
struct AsReversiblyEscapedUC16 {
explicit AsReversiblyEscapedUC16(uint16_t v) : value(v) {}
uint16_t value;
};
struct AsEscapedUC16ForJSON {
explicit AsEscapedUC16ForJSON(uint16_t v) : value(v) {}
uint16_t value;
};
// Output the given value as hex, with a minimum width and optional prefix (0x).
// E.g. AsHex(23, 3, true) produces "0x017". Produces an empty string if both
// {min_width} and the value are 0.
struct AsHex {
explicit AsHex(uint64_t v, uint8_t min_width = 1, bool with_prefix = false)
: value(v), min_width(min_width), with_prefix(with_prefix) {}
uint64_t value;
uint8_t min_width;
bool with_prefix;
};
// Output the given value as hex, separated in individual bytes.
// E.g. AsHexBytes(0x231712, 4) produces "12 17 23 00" if output as little
// endian (default), and "00 23 17 12" as big endian. Produces an empty string
// if both {min_bytes} and the value are 0.
struct AsHexBytes {
enum ByteOrder { kLittleEndian, kBigEndian };
explicit AsHexBytes(uint64_t v, uint8_t min_bytes = 1,
ByteOrder byte_order = kLittleEndian)
: value(v), min_bytes(min_bytes), byte_order(byte_order) {}
uint64_t value;
uint8_t min_bytes;
ByteOrder byte_order;
};
// Writes the given character to the output escaping everything outside of
// printable/space ASCII range. Additionally escapes '\' making escaping
// reversible.
std::ostream& operator<<(std::ostream& os, const AsReversiblyEscapedUC16& c);
// Same as AsReversiblyEscapedUC16 with additional escaping of \n, \r, " and '.
V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
const AsEscapedUC16ForJSON& c);
// Writes the given character to the output escaping everything outside
// of printable ASCII range.
std::ostream& operator<<(std::ostream& os, const AsUC16& c);
// Writes the given character to the output escaping everything outside
// of printable ASCII range.
std::ostream& operator<<(std::ostream& os, const AsUC32& c);
V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os, const AsHex& v);
V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
const AsHexBytes& v);
} // namespace internal
} // namespace v8
#endif // V8_OSTREAMS_H_
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