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
7 #if V8_OS_WIN
8 #if _MSC_VER < 1900
9 #define snprintf sprintf_s
10 #endif
11 #endif
12
13 namespace v8 {
14 namespace internal {
15
OFStreamBase(FILE * f)16 OFStreamBase::OFStreamBase(FILE* f) : f_(f) {}
17
18
~OFStreamBase()19 OFStreamBase::~OFStreamBase() {}
20
21
sync()22 int OFStreamBase::sync() {
23 std::fflush(f_);
24 return 0;
25 }
26
27
overflow(int_type c)28 OFStreamBase::int_type OFStreamBase::overflow(int_type c) {
29 return (c != EOF) ? std::fputc(c, f_) : c;
30 }
31
32
xsputn(const char * s,std::streamsize n)33 std::streamsize OFStreamBase::xsputn(const char* s, std::streamsize n) {
34 return static_cast<std::streamsize>(
35 std::fwrite(s, 1, static_cast<size_t>(n), f_));
36 }
37
38
OFStream(FILE * f)39 OFStream::OFStream(FILE* f) : std::ostream(nullptr), buf_(f) {
40 DCHECK_NOT_NULL(f);
41 rdbuf(&buf_);
42 }
43
44
~OFStream()45 OFStream::~OFStream() {}
46
47
48 namespace {
49
50 // Locale-independent predicates.
IsPrint(uint16_t c)51 bool IsPrint(uint16_t c) { return 0x20 <= c && c <= 0x7e; }
IsSpace(uint16_t c)52 bool IsSpace(uint16_t c) { return (0x9 <= c && c <= 0xd) || c == 0x20; }
IsOK(uint16_t c)53 bool IsOK(uint16_t c) { return (IsPrint(c) || IsSpace(c)) && c != '\\'; }
54
55
PrintUC16(std::ostream & os,uint16_t c,bool (* pred)(uint16_t))56 std::ostream& PrintUC16(std::ostream& os, uint16_t c, bool (*pred)(uint16_t)) {
57 char buf[10];
58 const char* format = pred(c) ? "%c" : (c <= 0xff) ? "\\x%02x" : "\\u%04x";
59 snprintf(buf, sizeof(buf), format, c);
60 return os << buf;
61 }
62
63 } // namespace
64
65
operator <<(std::ostream & os,const AsReversiblyEscapedUC16 & c)66 std::ostream& operator<<(std::ostream& os, const AsReversiblyEscapedUC16& c) {
67 return PrintUC16(os, c.value, IsOK);
68 }
69
70
operator <<(std::ostream & os,const AsEscapedUC16ForJSON & c)71 std::ostream& operator<<(std::ostream& os, const AsEscapedUC16ForJSON& c) {
72 if (c.value == '\n') return os << "\\n";
73 if (c.value == '\r') return os << "\\r";
74 if (c.value == '\t') return os << "\\t";
75 if (c.value == '\"') return os << "\\\"";
76 return PrintUC16(os, c.value, IsOK);
77 }
78
79
operator <<(std::ostream & os,const AsUC16 & c)80 std::ostream& operator<<(std::ostream& os, const AsUC16& c) {
81 return PrintUC16(os, c.value, IsPrint);
82 }
83
84 } // namespace internal
85 } // namespace v8
86