summaryrefslogtreecommitdiffstats
path: root/security/nss/gtests/google_test/gtest/src/gtest-printers.cc
blob: 1b68fcb500550f8d0846b158455a126bbc4bfdf1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
// Copyright 2007, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


// Google Test - The Google C++ Testing and Mocking Framework
//
// This file implements a universal value printer that can print a
// value of any type T:
//
//   void ::testing::internal::UniversalPrinter<T>::Print(value, ostream_ptr);
//
// It uses the << operator when possible, and prints the bytes in the
// object otherwise.  A user can override its behavior for a class
// type Foo by defining either operator<<(::std::ostream&, const Foo&)
// or void PrintTo(const Foo&, ::std::ostream*) in the namespace that
// defines Foo.

#include "gtest/gtest-printers.h"

#include <stdio.h>

#include <cctype>
#include <cstdint>
#include <cwchar>
#include <ostream>  // NOLINT
#include <string>
#include <type_traits>

#include "gtest/internal/gtest-port.h"
#include "src/gtest-internal-inl.h"

namespace testing {

namespace {

using ::std::ostream;

// Prints a segment of bytes in the given object.
GTEST_ATTRIBUTE_NO_SANITIZE_MEMORY_
GTEST_ATTRIBUTE_NO_SANITIZE_ADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_HWADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_THREAD_
void PrintByteSegmentInObjectTo(const unsigned char* obj_bytes, size_t start,
                                size_t count, ostream* os) {
  char text[5] = "";
  for (size_t i = 0; i != count; i++) {
    const size_t j = start + i;
    if (i != 0) {
      // Organizes the bytes into groups of 2 for easy parsing by
      // human.
      if ((j % 2) == 0)
        *os << ' ';
      else
        *os << '-';
    }
    GTEST_SNPRINTF_(text, sizeof(text), "%02X", obj_bytes[j]);
    *os << text;
  }
}

// Prints the bytes in the given value to the given ostream.
void PrintBytesInObjectToImpl(const unsigned char* obj_bytes, size_t count,
                              ostream* os) {
  // Tells the user how big the object is.
  *os << count << "-byte object <";

  const size_t kThreshold = 132;
  const size_t kChunkSize = 64;
  // If the object size is bigger than kThreshold, we'll have to omit
  // some details by printing only the first and the last kChunkSize
  // bytes.
  if (count < kThreshold) {
    PrintByteSegmentInObjectTo(obj_bytes, 0, count, os);
  } else {
    PrintByteSegmentInObjectTo(obj_bytes, 0, kChunkSize, os);
    *os << " ... ";
    // Rounds up to 2-byte boundary.
    const size_t resume_pos = (count - kChunkSize + 1)/2*2;
    PrintByteSegmentInObjectTo(obj_bytes, resume_pos, count - resume_pos, os);
  }
  *os << ">";
}

// Helpers for widening a character to char32_t. Since the standard does not
// specify if char / wchar_t is signed or unsigned, it is important to first
// convert it to the unsigned type of the same width before widening it to
// char32_t.
template <typename CharType>
char32_t ToChar32(CharType in) {
  return static_cast<char32_t>(
      static_cast<typename std::make_unsigned<CharType>::type>(in));
}

}  // namespace

namespace internal {

// Delegates to PrintBytesInObjectToImpl() to print the bytes in the
// given object.  The delegation simplifies the implementation, which
// uses the << operator and thus is easier done outside of the
// ::testing::internal namespace, which contains a << operator that
// sometimes conflicts with the one in STL.
void PrintBytesInObjectTo(const unsigned char* obj_bytes, size_t count,
                          ostream* os) {
  PrintBytesInObjectToImpl(obj_bytes, count, os);
}

// Depending on the value of a char (or wchar_t), we print it in one
// of three formats:
//   - as is if it's a printable ASCII (e.g. 'a', '2', ' '),
//   - as a hexadecimal escape sequence (e.g. '\x7F'), or
//   - as a special escape sequence (e.g. '\r', '\n').
enum CharFormat {
  kAsIs,
  kHexEscape,
  kSpecialEscape
};

// Returns true if c is a printable ASCII character.  We test the
// value of c directly instead of calling isprint(), which is buggy on
// Windows Mobile.
inline bool IsPrintableAscii(char32_t c) { return 0x20 <= c && c <= 0x7E; }

// Prints c (of type char, char8_t, char16_t, char32_t, or wchar_t) as a
// character literal without the quotes, escaping it when necessary; returns how
// c was formatted.
template <typename Char>
static CharFormat PrintAsCharLiteralTo(Char c, ostream* os) {
  const char32_t u_c = ToChar32(c);
  switch (u_c) {
    case L'\0':
      *os << "\\0";
      break;
    case L'\'':
      *os << "\\'";
      break;
    case L'\\':
      *os << "\\\\";
      break;
    case L'\a':
      *os << "\\a";
      break;
    case L'\b':
      *os << "\\b";
      break;
    case L'\f':
      *os << "\\f";
      break;
    case L'\n':
      *os << "\\n";
      break;
    case L'\r':
      *os << "\\r";
      break;
    case L'\t':
      *os << "\\t";
      break;
    case L'\v':
      *os << "\\v";
      break;
    default:
      if (IsPrintableAscii(u_c)) {
        *os << static_cast<char>(c);
        return kAsIs;
      } else {
        ostream::fmtflags flags = os->flags();
        *os << "\\x" << std::hex << std::uppercase << static_cast<int>(u_c);
        os->flags(flags);
        return kHexEscape;
      }
  }
  return kSpecialEscape;
}

// Prints a char32_t c as if it's part of a string literal, escaping it when
// necessary; returns how c was formatted.
static CharFormat PrintAsStringLiteralTo(char32_t c, ostream* os) {
  switch (c) {
    case L'\'':
      *os << "'";
      return kAsIs;
    case L'"':
      *os << "\\\"";
      return kSpecialEscape;
    default:
      return PrintAsCharLiteralTo(c, os);
  }
}

static const char* GetCharWidthPrefix(char) {
  return "";
}

static const char* GetCharWidthPrefix(signed char) {
  return "";
}

static const char* GetCharWidthPrefix(unsigned char) {
  return "";
}

#ifdef __cpp_char8_t
static const char* GetCharWidthPrefix(char8_t) {
  return "u8";
}
#endif

static const char* GetCharWidthPrefix(char16_t) {
  return "u";
}

static const char* GetCharWidthPrefix(char32_t) {
  return "U";
}

static const char* GetCharWidthPrefix(wchar_t) {
  return "L";
}

// Prints a char c as if it's part of a string literal, escaping it when
// necessary; returns how c was formatted.
static CharFormat PrintAsStringLiteralTo(char c, ostream* os) {
  return PrintAsStringLiteralTo(ToChar32(c), os);
}

#ifdef __cpp_char8_t
static CharFormat PrintAsStringLiteralTo(char8_t c, ostream* os) {
  return PrintAsStringLiteralTo(ToChar32(c), os);
}
#endif

static CharFormat PrintAsStringLiteralTo(char16_t c, ostream* os) {
  return PrintAsStringLiteralTo(ToChar32(c), os);
}

static CharFormat PrintAsStringLiteralTo(wchar_t c, ostream* os) {
  return PrintAsStringLiteralTo(ToChar32(c), os);
}

// Prints a character c (of type char, char8_t, char16_t, char32_t, or wchar_t)
// and its code. '\0' is printed as "'\\0'", other unprintable characters are
// also properly escaped using the standard C++ escape sequence.
template <typename Char>
void PrintCharAndCodeTo(Char c, ostream* os) {
  // First, print c as a literal in the most readable form we can find.
  *os << GetCharWidthPrefix(c) << "'";
  const CharFormat format = PrintAsCharLiteralTo(c, os);
  *os << "'";

  // To aid user debugging, we also print c's code in decimal, unless
  // it's 0 (in which case c was printed as '\\0', making the code
  // obvious).
  if (c == 0)
    return;
  *os << " (" << static_cast<int>(c);

  // For more convenience, we print c's code again in hexadecimal,
  // unless c was already printed in the form '\x##' or the code is in
  // [1, 9].
  if (format == kHexEscape || (1 <= c && c <= 9)) {
    // Do nothing.
  } else {
    *os << ", 0x" << String::FormatHexInt(static_cast<int>(c));
  }
  *os << ")";
}

void PrintTo(unsigned char c, ::std::ostream* os) { PrintCharAndCodeTo(c, os); }
void PrintTo(signed char c, ::std::ostream* os) { PrintCharAndCodeTo(c, os); }

// Prints a wchar_t as a symbol if it is printable or as its internal
// code otherwise and also as its code.  L'\0' is printed as "L'\\0'".
void PrintTo(wchar_t wc, ostream* os) { PrintCharAndCodeTo(wc, os); }

// TODO(dcheng): Consider making this delegate to PrintCharAndCodeTo() as well.
void PrintTo(char32_t c, ::std::ostream* os) {
  *os << std::hex << "U+" << std::uppercase << std::setfill('0') << std::setw(4)
      << static_cast<uint32_t>(c);
}

// Prints the given array of characters to the ostream.  CharType must be either
// char, char8_t, char16_t, char32_t, or wchar_t.
// The array starts at begin, the length is len, it may include '\0' characters
// and may not be NUL-terminated.
template <typename CharType>
GTEST_ATTRIBUTE_NO_SANITIZE_MEMORY_
GTEST_ATTRIBUTE_NO_SANITIZE_ADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_HWADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_THREAD_
static CharFormat PrintCharsAsStringTo(
    const CharType* begin, size_t len, ostream* os) {
  const char* const quote_prefix = GetCharWidthPrefix(*begin);
  *os << quote_prefix << "\"";
  bool is_previous_hex = false;
  CharFormat print_format = kAsIs;
  for (size_t index = 0; index < len; ++index) {
    const CharType cur = begin[index];
    if (is_previous_hex && IsXDigit(cur)) {
      // Previous character is of '\x..' form and this character can be
      // interpreted as another hexadecimal digit in its number. Break string to
      // disambiguate.
      *os << "\" " << quote_prefix << "\"";
    }
    is_previous_hex = PrintAsStringLiteralTo(cur, os) == kHexEscape;
    // Remember if any characters required hex escaping.
    if (is_previous_hex) {
      print_format = kHexEscape;
    }
  }
  *os << "\"";
  return print_format;
}

// Prints a (const) char/wchar_t array of 'len' elements, starting at address
// 'begin'.  CharType must be either char or wchar_t.
template <typename CharType>
GTEST_ATTRIBUTE_NO_SANITIZE_MEMORY_
GTEST_ATTRIBUTE_NO_SANITIZE_ADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_HWADDRESS_
GTEST_ATTRIBUTE_NO_SANITIZE_THREAD_
static void UniversalPrintCharArray(
    const CharType* begin, size_t len, ostream* os) {
  // The code
  //   const char kFoo[] = "foo";
  // generates an array of 4, not 3, elements, with the last one being '\0'.
  //
  // Therefore when printing a char array, we don't print the last element if
  // it's '\0', such that the output matches the string literal as it's
  // written in the source code.
  if (len > 0 && begin[len - 1] == '\0') {
    PrintCharsAsStringTo(begin, len - 1, os);
    return;
  }

  // If, however, the last element in the array is not '\0', e.g.
  //    const char kFoo[] = { 'f', 'o', 'o' };
  // we must print the entire array.  We also print a message to indicate
  // that the array is not NUL-terminated.
  PrintCharsAsStringTo(begin, len, os);
  *os << " (no terminating NUL)";
}

// Prints a (const) char array of 'len' elements, starting at address 'begin'.
void UniversalPrintArray(const char* begin, size_t len, ostream* os) {
  UniversalPrintCharArray(begin, len, os);
}

#ifdef __cpp_char8_t
// Prints a (const) char8_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const char8_t* begin, size_t len, ostream* os) {
  UniversalPrintCharArray(begin, len, os);
}
#endif

// Prints a (const) char16_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const char16_t* begin, size_t len, ostream* os) {
  UniversalPrintCharArray(begin, len, os);
}

// Prints a (const) char32_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const char32_t* begin, size_t len, ostream* os) {
  UniversalPrintCharArray(begin, len, os);
}

// Prints a (const) wchar_t array of 'len' elements, starting at address
// 'begin'.
void UniversalPrintArray(const wchar_t* begin, size_t len, ostream* os) {
  UniversalPrintCharArray(begin, len, os);
}

namespace {

// Prints a null-terminated C-style string to the ostream.
template <typename Char>
void PrintCStringTo(const Char* s, ostream* os) {
  if (s == nullptr) {
    *os << "NULL";
  } else {
    *os << ImplicitCast_<const void*>(s) << " pointing to ";
    PrintCharsAsStringTo(s, std::char_traits<Char>::length(s), os);
  }
}

}  // anonymous namespace

void PrintTo(const char* s, ostream* os) { PrintCStringTo(s, os); }

#ifdef __cpp_char8_t
void PrintTo(const char8_t* s, ostream* os) { PrintCStringTo(s, os); }
#endif

void PrintTo(const char16_t* s, ostream* os) { PrintCStringTo(s, os); }

void PrintTo(const char32_t* s, ostream* os) { PrintCStringTo(s, os); }

// MSVC compiler can be configured to define whar_t as a typedef
// of unsigned short. Defining an overload for const wchar_t* in that case
// would cause pointers to unsigned shorts be printed as wide strings,
// possibly accessing more memory than intended and causing invalid
// memory accesses. MSVC defines _NATIVE_WCHAR_T_DEFINED symbol when
// wchar_t is implemented as a native type.
#if !defined(_MSC_VER) || defined(_NATIVE_WCHAR_T_DEFINED)
// Prints the given wide C string to the ostream.
void PrintTo(const wchar_t* s, ostream* os) { PrintCStringTo(s, os); }
#endif  // wchar_t is native

namespace {

bool ContainsUnprintableControlCodes(const char* str, size_t length) {
  const unsigned char *s = reinterpret_cast<const unsigned char *>(str);

  for (size_t i = 0; i < length; i++) {
    unsigned char ch = *s++;
    if (std::iscntrl(ch)) {
        switch (ch) {
        case '\t':
        case '\n':
        case '\r':
          break;
        default:
          return true;
        }
      }
  }
  return false;
}

bool IsUTF8TrailByte(unsigned char t) { return 0x80 <= t && t<= 0xbf; }

bool IsValidUTF8(const char* str, size_t length) {
  const unsigned char *s = reinterpret_cast<const unsigned char *>(str);

  for (size_t i = 0; i < length;) {
    unsigned char lead = s[i++];

    if (lead <= 0x7f) {
      continue;  // single-byte character (ASCII) 0..7F
    }
    if (lead < 0xc2) {
      return false;  // trail byte or non-shortest form
    } else if (lead <= 0xdf && (i + 1) <= length && IsUTF8TrailByte(s[i])) {
      ++i;  // 2-byte character
    } else if (0xe0 <= lead && lead <= 0xef && (i + 2) <= length &&
               IsUTF8TrailByte(s[i]) &&
               IsUTF8TrailByte(s[i + 1]) &&
               // check for non-shortest form and surrogate
               (lead != 0xe0 || s[i] >= 0xa0) &&
               (lead != 0xed || s[i] < 0xa0)) {
      i += 2;  // 3-byte character
    } else if (0xf0 <= lead && lead <= 0xf4 && (i + 3) <= length &&
               IsUTF8TrailByte(s[i]) &&
               IsUTF8TrailByte(s[i + 1]) &&
               IsUTF8TrailByte(s[i + 2]) &&
               // check for non-shortest form
               (lead != 0xf0 || s[i] >= 0x90) &&
               (lead != 0xf4 || s[i] < 0x90)) {
      i += 3;  // 4-byte character
    } else {
      return false;
    }
  }
  return true;
}

void ConditionalPrintAsText(const char* str, size_t length, ostream* os) {
  if (!ContainsUnprintableControlCodes(str, length) &&
      IsValidUTF8(str, length)) {
    *os << "\n    As Text: \"" << str << "\"";
  }
}

}  // anonymous namespace

void PrintStringTo(const ::std::string& s, ostream* os) {
  if (PrintCharsAsStringTo(s.data(), s.size(), os) == kHexEscape) {
    if (GTEST_FLAG(print_utf8)) {
      ConditionalPrintAsText(s.data(), s.size(), os);
    }
  }
}

#ifdef __cpp_char8_t
void PrintU8StringTo(const ::std::u8string& s, ostream* os) {
  PrintCharsAsStringTo(s.data(), s.size(), os);
}
#endif

void PrintU16StringTo(const ::std::u16string& s, ostream* os) {
  PrintCharsAsStringTo(s.data(), s.size(), os);
}

void PrintU32StringTo(const ::std::u32string& s, ostream* os) {
  PrintCharsAsStringTo(s.data(), s.size(), os);
}

#if GTEST_HAS_STD_WSTRING
void PrintWideStringTo(const ::std::wstring& s, ostream* os) {
  PrintCharsAsStringTo(s.data(), s.size(), os);
}
#endif  // GTEST_HAS_STD_WSTRING

}  // namespace internal

}  // namespace testing