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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.
#include "src/ostreams.h"
#include "src/objects.h"
#include "src/objects/string.h"
#if V8_OS_WIN
#if _MSC_VER < 1900
#define snprintf sprintf_s
#endif
#endif
#if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT)
#define LOG_TAG "v8"
#include <android/log.h> // NOLINT
#endif
namespace v8 {
namespace internal {
OFStreamBase::OFStreamBase(FILE* f) : f_(f) {}
int OFStreamBase::sync() {
std::fflush(f_);
return 0;
}
OFStreamBase::int_type OFStreamBase::overflow(int_type c) {
return (c != EOF) ? std::fputc(c, f_) : c;
}
std::streamsize OFStreamBase::xsputn(const char* s, std::streamsize n) {
return static_cast<std::streamsize>(
std::fwrite(s, 1, static_cast<size_t>(n), f_));
}
OFStream::OFStream(FILE* f) : std::ostream(nullptr), buf_(f) {
DCHECK_NOT_NULL(f);
rdbuf(&buf_);
}
#if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT)
AndroidLogStream::~AndroidLogStream() {
// If there is anything left in the line buffer, print it now, even though it
// was not terminated by a newline.
if (!line_buffer_.empty()) {
__android_log_write(ANDROID_LOG_INFO, LOG_TAG, line_buffer_.c_str());
}
}
std::streamsize AndroidLogStream::xsputn(const char* s, std::streamsize n) {
const char* const e = s + n;
while (s < e) {
const char* newline = reinterpret_cast<const char*>(memchr(s, '\n', e - s));
size_t line_chars = (newline ? newline : e) - s;
line_buffer_.append(s, line_chars);
// Without terminating newline, keep the characters in the buffer for the
// next invocation.
if (!newline) break;
// Otherwise, write out the first line, then continue.
__android_log_write(ANDROID_LOG_INFO, LOG_TAG, line_buffer_.c_str());
line_buffer_.clear();
s = newline + 1;
}
return n;
}
#endif
namespace {
// Locale-independent predicates.
bool IsPrint(uint16_t c) { return 0x20 <= c && c <= 0x7E; }
bool IsSpace(uint16_t c) { return (0x9 <= c && c <= 0xD) || c == 0x20; }
bool IsOK(uint16_t c) { return (IsPrint(c) || IsSpace(c)) && c != '\\'; }
std::ostream& PrintUC16(std::ostream& os, uint16_t c, bool (*pred)(uint16_t)) {
char buf[10];
const char* format = pred(c) ? "%c" : (c <= 0xFF) ? "\\x%02x" : "\\u%04x";
snprintf(buf, sizeof(buf), format, c);
return os << buf;
}
std::ostream& PrintUC16ForJSON(std::ostream& os, uint16_t c,
bool (*pred)(uint16_t)) {
// JSON does not allow \x99; must use \u0099.
char buf[10];
const char* format = pred(c) ? "%c" : "\\u%04x";
snprintf(buf, sizeof(buf), format, c);
return os << buf;
}
std::ostream& PrintUC32(std::ostream& os, int32_t c, bool (*pred)(uint16_t)) {
if (c <= String::kMaxUtf16CodeUnit) {
return PrintUC16(os, static_cast<uint16_t>(c), pred);
}
char buf[13];
snprintf(buf, sizeof(buf), "\\u{%06x}", c);
return os << buf;
}
} // namespace
std::ostream& operator<<(std::ostream& os, const AsReversiblyEscapedUC16& c) {
return PrintUC16(os, c.value, IsOK);
}
std::ostream& operator<<(std::ostream& os, const AsEscapedUC16ForJSON& c) {
if (c.value == '\n') return os << "\\n";
if (c.value == '\r') return os << "\\r";
if (c.value == '\t') return os << "\\t";
if (c.value == '\"') return os << "\\\"";
return PrintUC16ForJSON(os, c.value, IsOK);
}
std::ostream& operator<<(std::ostream& os, const AsUC16& c) {
return PrintUC16(os, c.value, IsPrint);
}
std::ostream& operator<<(std::ostream& os, const AsUC32& c) {
return PrintUC32(os, c.value, IsPrint);
}
std::ostream& operator<<(std::ostream& os, const AsHex& hex) {
// Each byte uses up to two characters. Plus two characters for the prefix,
// plus null terminator.
DCHECK_GE(sizeof(hex.value) * 2, hex.min_width);
static constexpr size_t kMaxHexLength = 3 + sizeof(hex.value) * 2;
char buf[kMaxHexLength];
snprintf(buf, kMaxHexLength, "%s%.*" PRIx64, hex.with_prefix ? "0x" : "",
hex.min_width, hex.value);
return os << buf;
}
std::ostream& operator<<(std::ostream& os, const AsHexBytes& hex) {
uint8_t bytes = hex.min_bytes;
while (bytes < sizeof(hex.value) && (hex.value >> (bytes * 8) != 0)) ++bytes;
for (uint8_t b = 0; b < bytes; ++b) {
if (b) os << " ";
uint8_t printed_byte =
hex.byte_order == AsHexBytes::kLittleEndian ? b : bytes - b - 1;
os << AsHex((hex.value >> (8 * printed_byte)) & 0xFF, 2);
}
return os;
}
} // namespace internal
} // namespace v8
#undef snprintf
#undef LOG_TAG
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