1// Copyright 2014 the V8 project authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include "src/ostreams.h" 6#include "src/objects.h" 7 8#if V8_OS_WIN 9#if _MSC_VER < 1900 10#define snprintf sprintf_s 11#endif 12#endif 13 14namespace v8 { 15namespace internal { 16 17OFStreamBase::OFStreamBase(FILE* f) : f_(f) {} 18 19 20OFStreamBase::~OFStreamBase() {} 21 22 23int OFStreamBase::sync() { 24 std::fflush(f_); 25 return 0; 26} 27 28 29OFStreamBase::int_type OFStreamBase::overflow(int_type c) { 30 return (c != EOF) ? std::fputc(c, f_) : c; 31} 32 33 34std::streamsize OFStreamBase::xsputn(const char* s, std::streamsize n) { 35 return static_cast<std::streamsize>( 36 std::fwrite(s, 1, static_cast<size_t>(n), f_)); 37} 38 39 40OFStream::OFStream(FILE* f) : std::ostream(nullptr), buf_(f) { 41 DCHECK_NOT_NULL(f); 42 rdbuf(&buf_); 43} 44 45 46OFStream::~OFStream() {} 47 48 49namespace { 50 51// Locale-independent predicates. 52bool IsPrint(uint16_t c) { return 0x20 <= c && c <= 0x7e; } 53bool IsSpace(uint16_t c) { return (0x9 <= c && c <= 0xd) || c == 0x20; } 54bool IsOK(uint16_t c) { return (IsPrint(c) || IsSpace(c)) && c != '\\'; } 55 56 57std::ostream& PrintUC16(std::ostream& os, uint16_t c, bool (*pred)(uint16_t)) { 58 char buf[10]; 59 const char* format = pred(c) ? "%c" : (c <= 0xff) ? "\\x%02x" : "\\u%04x"; 60 snprintf(buf, sizeof(buf), format, c); 61 return os << buf; 62} 63 64 65std::ostream& PrintUC32(std::ostream& os, int32_t c, bool (*pred)(uint16_t)) { 66 if (c <= String::kMaxUtf16CodeUnit) { 67 return PrintUC16(os, static_cast<uint16_t>(c), pred); 68 } 69 char buf[13]; 70 snprintf(buf, sizeof(buf), "\\u{%06x}", c); 71 return os << buf; 72} 73 74} // namespace 75 76 77std::ostream& operator<<(std::ostream& os, const AsReversiblyEscapedUC16& c) { 78 return PrintUC16(os, c.value, IsOK); 79} 80 81 82std::ostream& operator<<(std::ostream& os, const AsEscapedUC16ForJSON& c) { 83 if (c.value == '\n') return os << "\\n"; 84 if (c.value == '\r') return os << "\\r"; 85 if (c.value == '\t') return os << "\\t"; 86 if (c.value == '\"') return os << "\\\""; 87 return PrintUC16(os, c.value, IsOK); 88} 89 90 91std::ostream& operator<<(std::ostream& os, const AsUC16& c) { 92 return PrintUC16(os, c.value, IsPrint); 93} 94 95 96std::ostream& operator<<(std::ostream& os, const AsUC32& c) { 97 return PrintUC32(os, c.value, IsPrint); 98} 99 100std::ostream& operator<<(std::ostream& os, const AsHex& hex) { 101 char buf[20]; 102 snprintf(buf, sizeof(buf), "%.*" PRIx64, hex.min_width, hex.value); 103 return os << buf; 104} 105 106} // namespace internal 107} // namespace v8 108