// 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