1// Copyright 2006-2008 the V8 project authors. All rights reserved.
2
3#include <stdlib.h>
4
5#include "v8.h"
6
7#include "bignum.h"
8#include "cctest.h"
9#include "diy-fp.h"
10#include "double.h"
11#include "strtod.h"
12
13using namespace v8::internal;
14
15static Vector<const char> StringToVector(const char* str) {
16  return Vector<const char>(str, StrLength(str));
17}
18
19
20static double StrtodChar(const char* str, int exponent) {
21  return Strtod(StringToVector(str), exponent);
22}
23
24
25TEST(Strtod) {
26  Vector<const char> vector;
27
28  vector = StringToVector("0");
29  CHECK_EQ(0.0, Strtod(vector, 1));
30  CHECK_EQ(0.0, Strtod(vector, 2));
31  CHECK_EQ(0.0, Strtod(vector, -2));
32  CHECK_EQ(0.0, Strtod(vector, -999));
33  CHECK_EQ(0.0, Strtod(vector, +999));
34
35  vector = StringToVector("1");
36  CHECK_EQ(1.0, Strtod(vector, 0));
37  CHECK_EQ(10.0, Strtod(vector, 1));
38  CHECK_EQ(100.0, Strtod(vector, 2));
39  CHECK_EQ(1e20, Strtod(vector, 20));
40  CHECK_EQ(1e22, Strtod(vector, 22));
41  CHECK_EQ(1e23, Strtod(vector, 23));
42  CHECK_EQ(1e35, Strtod(vector, 35));
43  CHECK_EQ(1e36, Strtod(vector, 36));
44  CHECK_EQ(1e37, Strtod(vector, 37));
45  CHECK_EQ(1e-1, Strtod(vector, -1));
46  CHECK_EQ(1e-2, Strtod(vector, -2));
47  CHECK_EQ(1e-5, Strtod(vector, -5));
48  CHECK_EQ(1e-20, Strtod(vector, -20));
49  CHECK_EQ(1e-22, Strtod(vector, -22));
50  CHECK_EQ(1e-23, Strtod(vector, -23));
51  CHECK_EQ(1e-25, Strtod(vector, -25));
52  CHECK_EQ(1e-39, Strtod(vector, -39));
53
54  vector = StringToVector("2");
55  CHECK_EQ(2.0, Strtod(vector, 0));
56  CHECK_EQ(20.0, Strtod(vector, 1));
57  CHECK_EQ(200.0, Strtod(vector, 2));
58  CHECK_EQ(2e20, Strtod(vector, 20));
59  CHECK_EQ(2e22, Strtod(vector, 22));
60  CHECK_EQ(2e23, Strtod(vector, 23));
61  CHECK_EQ(2e35, Strtod(vector, 35));
62  CHECK_EQ(2e36, Strtod(vector, 36));
63  CHECK_EQ(2e37, Strtod(vector, 37));
64  CHECK_EQ(2e-1, Strtod(vector, -1));
65  CHECK_EQ(2e-2, Strtod(vector, -2));
66  CHECK_EQ(2e-5, Strtod(vector, -5));
67  CHECK_EQ(2e-20, Strtod(vector, -20));
68  CHECK_EQ(2e-22, Strtod(vector, -22));
69  CHECK_EQ(2e-23, Strtod(vector, -23));
70  CHECK_EQ(2e-25, Strtod(vector, -25));
71  CHECK_EQ(2e-39, Strtod(vector, -39));
72
73  vector = StringToVector("9");
74  CHECK_EQ(9.0, Strtod(vector, 0));
75  CHECK_EQ(90.0, Strtod(vector, 1));
76  CHECK_EQ(900.0, Strtod(vector, 2));
77  CHECK_EQ(9e20, Strtod(vector, 20));
78  CHECK_EQ(9e22, Strtod(vector, 22));
79  CHECK_EQ(9e23, Strtod(vector, 23));
80  CHECK_EQ(9e35, Strtod(vector, 35));
81  CHECK_EQ(9e36, Strtod(vector, 36));
82  CHECK_EQ(9e37, Strtod(vector, 37));
83  CHECK_EQ(9e-1, Strtod(vector, -1));
84  CHECK_EQ(9e-2, Strtod(vector, -2));
85  CHECK_EQ(9e-5, Strtod(vector, -5));
86  CHECK_EQ(9e-20, Strtod(vector, -20));
87  CHECK_EQ(9e-22, Strtod(vector, -22));
88  CHECK_EQ(9e-23, Strtod(vector, -23));
89  CHECK_EQ(9e-25, Strtod(vector, -25));
90  CHECK_EQ(9e-39, Strtod(vector, -39));
91
92  vector = StringToVector("12345");
93  CHECK_EQ(12345.0, Strtod(vector, 0));
94  CHECK_EQ(123450.0, Strtod(vector, 1));
95  CHECK_EQ(1234500.0, Strtod(vector, 2));
96  CHECK_EQ(12345e20, Strtod(vector, 20));
97  CHECK_EQ(12345e22, Strtod(vector, 22));
98  CHECK_EQ(12345e23, Strtod(vector, 23));
99  CHECK_EQ(12345e30, Strtod(vector, 30));
100  CHECK_EQ(12345e31, Strtod(vector, 31));
101  CHECK_EQ(12345e32, Strtod(vector, 32));
102  CHECK_EQ(12345e35, Strtod(vector, 35));
103  CHECK_EQ(12345e36, Strtod(vector, 36));
104  CHECK_EQ(12345e37, Strtod(vector, 37));
105  CHECK_EQ(12345e-1, Strtod(vector, -1));
106  CHECK_EQ(12345e-2, Strtod(vector, -2));
107  CHECK_EQ(12345e-5, Strtod(vector, -5));
108  CHECK_EQ(12345e-20, Strtod(vector, -20));
109  CHECK_EQ(12345e-22, Strtod(vector, -22));
110  CHECK_EQ(12345e-23, Strtod(vector, -23));
111  CHECK_EQ(12345e-25, Strtod(vector, -25));
112  CHECK_EQ(12345e-39, Strtod(vector, -39));
113
114  vector = StringToVector("12345678901234");
115  CHECK_EQ(12345678901234.0, Strtod(vector, 0));
116  CHECK_EQ(123456789012340.0, Strtod(vector, 1));
117  CHECK_EQ(1234567890123400.0, Strtod(vector, 2));
118  CHECK_EQ(12345678901234e20, Strtod(vector, 20));
119  CHECK_EQ(12345678901234e22, Strtod(vector, 22));
120  CHECK_EQ(12345678901234e23, Strtod(vector, 23));
121  CHECK_EQ(12345678901234e30, Strtod(vector, 30));
122  CHECK_EQ(12345678901234e31, Strtod(vector, 31));
123  CHECK_EQ(12345678901234e32, Strtod(vector, 32));
124  CHECK_EQ(12345678901234e35, Strtod(vector, 35));
125  CHECK_EQ(12345678901234e36, Strtod(vector, 36));
126  CHECK_EQ(12345678901234e37, Strtod(vector, 37));
127  CHECK_EQ(12345678901234e-1, Strtod(vector, -1));
128  CHECK_EQ(12345678901234e-2, Strtod(vector, -2));
129  CHECK_EQ(12345678901234e-5, Strtod(vector, -5));
130  CHECK_EQ(12345678901234e-20, Strtod(vector, -20));
131  CHECK_EQ(12345678901234e-22, Strtod(vector, -22));
132  CHECK_EQ(12345678901234e-23, Strtod(vector, -23));
133  CHECK_EQ(12345678901234e-25, Strtod(vector, -25));
134  CHECK_EQ(12345678901234e-39, Strtod(vector, -39));
135
136  vector = StringToVector("123456789012345");
137  CHECK_EQ(123456789012345.0, Strtod(vector, 0));
138  CHECK_EQ(1234567890123450.0, Strtod(vector, 1));
139  CHECK_EQ(12345678901234500.0, Strtod(vector, 2));
140  CHECK_EQ(123456789012345e20, Strtod(vector, 20));
141  CHECK_EQ(123456789012345e22, Strtod(vector, 22));
142  CHECK_EQ(123456789012345e23, Strtod(vector, 23));
143  CHECK_EQ(123456789012345e35, Strtod(vector, 35));
144  CHECK_EQ(123456789012345e36, Strtod(vector, 36));
145  CHECK_EQ(123456789012345e37, Strtod(vector, 37));
146  CHECK_EQ(123456789012345e39, Strtod(vector, 39));
147  CHECK_EQ(123456789012345e-1, Strtod(vector, -1));
148  CHECK_EQ(123456789012345e-2, Strtod(vector, -2));
149  CHECK_EQ(123456789012345e-5, Strtod(vector, -5));
150  CHECK_EQ(123456789012345e-20, Strtod(vector, -20));
151  CHECK_EQ(123456789012345e-22, Strtod(vector, -22));
152  CHECK_EQ(123456789012345e-23, Strtod(vector, -23));
153  CHECK_EQ(123456789012345e-25, Strtod(vector, -25));
154  CHECK_EQ(123456789012345e-39, Strtod(vector, -39));
155
156  CHECK_EQ(0.0, StrtodChar("0", 12345));
157  CHECK_EQ(0.0, StrtodChar("", 1324));
158  CHECK_EQ(0.0, StrtodChar("000000000", 123));
159  CHECK_EQ(0.0, StrtodChar("2", -324));
160  CHECK_EQ(4e-324, StrtodChar("3", -324));
161  // It would be more readable to put non-zero literals on the left side (i.e.
162  //   CHECK_EQ(1e-325, StrtodChar("1", -325))), but then Gcc complains that
163  // they are truncated to zero.
164  CHECK_EQ(0.0, StrtodChar("1", -325));
165  CHECK_EQ(0.0, StrtodChar("1", -325));
166  CHECK_EQ(0.0, StrtodChar("20000", -328));
167  CHECK_EQ(40000e-328, StrtodChar("30000", -328));
168  CHECK_EQ(0.0, StrtodChar("10000", -329));
169  CHECK_EQ(0.0, StrtodChar("90000", -329));
170  CHECK_EQ(0.0, StrtodChar("000000001", -325));
171  CHECK_EQ(0.0, StrtodChar("000000001", -325));
172  CHECK_EQ(0.0, StrtodChar("0000000020000", -328));
173  CHECK_EQ(40000e-328, StrtodChar("00000030000", -328));
174  CHECK_EQ(0.0, StrtodChar("0000000010000", -329));
175  CHECK_EQ(0.0, StrtodChar("0000000090000", -329));
176
177  // It would be more readable to put the literals (and not V8_INFINITY) on the
178  // left side (i.e. CHECK_EQ(1e309, StrtodChar("1", 309))), but then Gcc
179  // complains that the floating constant exceeds range of 'double'.
180  CHECK_EQ(V8_INFINITY, StrtodChar("1", 309));
181  CHECK_EQ(1e308, StrtodChar("1", 308));
182  CHECK_EQ(1234e305, StrtodChar("1234", 305));
183  CHECK_EQ(1234e304, StrtodChar("1234", 304));
184  CHECK_EQ(V8_INFINITY, StrtodChar("18", 307));
185  CHECK_EQ(17e307, StrtodChar("17", 307));
186  CHECK_EQ(V8_INFINITY, StrtodChar("0000001", 309));
187  CHECK_EQ(1e308, StrtodChar("00000001", 308));
188  CHECK_EQ(1234e305, StrtodChar("00000001234", 305));
189  CHECK_EQ(1234e304, StrtodChar("000000001234", 304));
190  CHECK_EQ(V8_INFINITY, StrtodChar("0000000018", 307));
191  CHECK_EQ(17e307, StrtodChar("0000000017", 307));
192  CHECK_EQ(V8_INFINITY, StrtodChar("1000000", 303));
193  CHECK_EQ(1e308, StrtodChar("100000", 303));
194  CHECK_EQ(1234e305, StrtodChar("123400000", 300));
195  CHECK_EQ(1234e304, StrtodChar("123400000", 299));
196  CHECK_EQ(V8_INFINITY, StrtodChar("180000000", 300));
197  CHECK_EQ(17e307, StrtodChar("170000000", 300));
198  CHECK_EQ(V8_INFINITY, StrtodChar("00000001000000", 303));
199  CHECK_EQ(1e308, StrtodChar("000000000000100000", 303));
200  CHECK_EQ(1234e305, StrtodChar("00000000123400000", 300));
201  CHECK_EQ(1234e304, StrtodChar("0000000123400000", 299));
202  CHECK_EQ(V8_INFINITY, StrtodChar("00000000180000000", 300));
203  CHECK_EQ(17e307, StrtodChar("00000000170000000", 300));
204  CHECK_EQ(1.7976931348623157E+308, StrtodChar("17976931348623157", 292));
205  CHECK_EQ(1.7976931348623158E+308, StrtodChar("17976931348623158", 292));
206  CHECK_EQ(V8_INFINITY, StrtodChar("17976931348623159", 292));
207
208  // The following number is the result of 89255.0/1e22. Both floating-point
209  // numbers can be accurately represented with doubles. However on Linux,x86
210  // the floating-point stack is set to 80bits and the double-rounding
211  // introduces an error.
212  CHECK_EQ(89255e-22, StrtodChar("89255", -22));
213
214  // Some random values.
215  CHECK_EQ(358416272e-33, StrtodChar("358416272", -33));
216  CHECK_EQ(104110013277974872254e-225,
217           StrtodChar("104110013277974872254", -225));
218
219  CHECK_EQ(123456789e108, StrtodChar("123456789", 108));
220  CHECK_EQ(123456789e109, StrtodChar("123456789", 109));
221  CHECK_EQ(123456789e110, StrtodChar("123456789", 110));
222  CHECK_EQ(123456789e111, StrtodChar("123456789", 111));
223  CHECK_EQ(123456789e112, StrtodChar("123456789", 112));
224  CHECK_EQ(123456789e113, StrtodChar("123456789", 113));
225  CHECK_EQ(123456789e114, StrtodChar("123456789", 114));
226  CHECK_EQ(123456789e115, StrtodChar("123456789", 115));
227
228  CHECK_EQ(1234567890123456789012345e108,
229           StrtodChar("1234567890123456789012345", 108));
230  CHECK_EQ(1234567890123456789012345e109,
231           StrtodChar("1234567890123456789012345", 109));
232  CHECK_EQ(1234567890123456789012345e110,
233           StrtodChar("1234567890123456789012345", 110));
234  CHECK_EQ(1234567890123456789012345e111,
235           StrtodChar("1234567890123456789012345", 111));
236  CHECK_EQ(1234567890123456789012345e112,
237           StrtodChar("1234567890123456789012345", 112));
238  CHECK_EQ(1234567890123456789012345e113,
239           StrtodChar("1234567890123456789012345", 113));
240  CHECK_EQ(1234567890123456789012345e114,
241           StrtodChar("1234567890123456789012345", 114));
242  CHECK_EQ(1234567890123456789012345e115,
243           StrtodChar("1234567890123456789012345", 115));
244
245  CHECK_EQ(1234567890123456789052345e108,
246           StrtodChar("1234567890123456789052345", 108));
247  CHECK_EQ(1234567890123456789052345e109,
248           StrtodChar("1234567890123456789052345", 109));
249  CHECK_EQ(1234567890123456789052345e110,
250           StrtodChar("1234567890123456789052345", 110));
251  CHECK_EQ(1234567890123456789052345e111,
252           StrtodChar("1234567890123456789052345", 111));
253  CHECK_EQ(1234567890123456789052345e112,
254           StrtodChar("1234567890123456789052345", 112));
255  CHECK_EQ(1234567890123456789052345e113,
256           StrtodChar("1234567890123456789052345", 113));
257  CHECK_EQ(1234567890123456789052345e114,
258           StrtodChar("1234567890123456789052345", 114));
259  CHECK_EQ(1234567890123456789052345e115,
260           StrtodChar("1234567890123456789052345", 115));
261
262  CHECK_EQ(5.445618932859895e-255,
263           StrtodChar("5445618932859895362967233318697132813618813095743952975"
264                      "4392982234069699615600475529427176366709107287468930197"
265                      "8628345413991790019316974825934906752493984055268219809"
266                      "5012176093045431437495773903922425632551857520884625114"
267                      "6241265881735209066709685420744388526014389929047617597"
268                      "0302268848374508109029268898695825171158085457567481507"
269                      "4162979705098246243690189880319928315307816832576838178"
270                      "2563074014542859888710209237525873301724479666744537857"
271                      "9026553346649664045621387124193095870305991178772256504"
272                      "4368663670643970181259143319016472430928902201239474588"
273                      "1392338901353291306607057623202353588698746085415097902"
274                      "6640064319118728664842287477491068264828851624402189317"
275                      "2769161449825765517353755844373640588822904791244190695"
276                      "2998382932630754670573838138825217065450843010498555058"
277                      "88186560731", -1035));
278
279  // Boundary cases. Boundaries themselves should round to even.
280  //
281  // 0x1FFFFFFFFFFFF * 2^3 = 72057594037927928
282  //                   next: 72057594037927936
283  //               boundary: 72057594037927932  should round up.
284  CHECK_EQ(72057594037927928.0, StrtodChar("72057594037927928", 0));
285  CHECK_EQ(72057594037927936.0, StrtodChar("72057594037927936", 0));
286  CHECK_EQ(72057594037927936.0, StrtodChar("72057594037927932", 0));
287  CHECK_EQ(72057594037927928.0, StrtodChar("7205759403792793199999", -5));
288  CHECK_EQ(72057594037927936.0, StrtodChar("7205759403792793200001", -5));
289
290  // 0x1FFFFFFFFFFFF * 2^10 = 9223372036854774784
291  //                    next: 9223372036854775808
292  //                boundary: 9223372036854775296 should round up.
293  CHECK_EQ(9223372036854774784.0, StrtodChar("9223372036854774784", 0));
294  CHECK_EQ(9223372036854775808.0, StrtodChar("9223372036854775808", 0));
295  CHECK_EQ(9223372036854775808.0, StrtodChar("9223372036854775296", 0));
296  CHECK_EQ(9223372036854774784.0, StrtodChar("922337203685477529599999", -5));
297  CHECK_EQ(9223372036854775808.0, StrtodChar("922337203685477529600001", -5));
298
299  // 0x1FFFFFFFFFFFF * 2^50 = 10141204801825834086073718800384
300  //                    next: 10141204801825835211973625643008
301  //                boundary: 10141204801825834649023672221696 should round up.
302  CHECK_EQ(10141204801825834086073718800384.0,
303           StrtodChar("10141204801825834086073718800384", 0));
304  CHECK_EQ(10141204801825835211973625643008.0,
305           StrtodChar("10141204801825835211973625643008", 0));
306  CHECK_EQ(10141204801825835211973625643008.0,
307           StrtodChar("10141204801825834649023672221696", 0));
308  CHECK_EQ(10141204801825834086073718800384.0,
309           StrtodChar("1014120480182583464902367222169599999", -5));
310  CHECK_EQ(10141204801825835211973625643008.0,
311           StrtodChar("1014120480182583464902367222169600001", -5));
312
313  // 0x1FFFFFFFFFFFF * 2^99 = 5708990770823838890407843763683279797179383808
314  //                    next: 5708990770823839524233143877797980545530986496
315  //                boundary: 5708990770823839207320493820740630171355185152
316  // The boundary should round up.
317  CHECK_EQ(5708990770823838890407843763683279797179383808.0,
318           StrtodChar("5708990770823838890407843763683279797179383808", 0));
319  CHECK_EQ(5708990770823839524233143877797980545530986496.0,
320           StrtodChar("5708990770823839524233143877797980545530986496", 0));
321  CHECK_EQ(5708990770823839524233143877797980545530986496.0,
322           StrtodChar("5708990770823839207320493820740630171355185152", 0));
323  CHECK_EQ(5708990770823838890407843763683279797179383808.0,
324           StrtodChar("5708990770823839207320493820740630171355185151999", -3));
325  CHECK_EQ(5708990770823839524233143877797980545530986496.0,
326           StrtodChar("5708990770823839207320493820740630171355185152001", -3));
327
328  // The following test-cases got some public attention in early 2011 when they
329  // sent Java and PHP into an infinite loop.
330  CHECK_EQ(2.225073858507201e-308, StrtodChar("22250738585072011", -324));
331  CHECK_EQ(2.22507385850720138309e-308,
332           StrtodChar("22250738585072011360574097967091319759348195463516456480"
333                      "23426109724822222021076945516529523908135087914149158913"
334                      "03962110687008643869459464552765720740782062174337998814"
335                      "10632673292535522868813721490129811224514518898490572223"
336                      "07285255133155755015914397476397983411801999323962548289"
337                      "01710708185069063066665599493827577257201576306269066333"
338                      "26475653000092458883164330377797918696120494973903778297"
339                      "04905051080609940730262937128958950003583799967207254304"
340                      "36028407889577179615094551674824347103070260914462157228"
341                      "98802581825451803257070188608721131280795122334262883686"
342                      "22321503775666622503982534335974568884423900265498198385"
343                      "48794829220689472168983109969836584681402285424333066033"
344                      "98508864458040010349339704275671864433837704860378616227"
345                      "71738545623065874679014086723327636718751", -1076));
346}
347
348
349static int CompareBignumToDiyFp(const Bignum& bignum_digits,
350                                int bignum_exponent,
351                                DiyFp diy_fp) {
352  Bignum bignum;
353  bignum.AssignBignum(bignum_digits);
354  Bignum other;
355  other.AssignUInt64(diy_fp.f());
356  if (bignum_exponent >= 0) {
357    bignum.MultiplyByPowerOfTen(bignum_exponent);
358  } else {
359    other.MultiplyByPowerOfTen(-bignum_exponent);
360  }
361  if (diy_fp.e() >= 0) {
362    other.ShiftLeft(diy_fp.e());
363  } else {
364    bignum.ShiftLeft(-diy_fp.e());
365  }
366  return Bignum::Compare(bignum, other);
367}
368
369
370static bool CheckDouble(Vector<const char> buffer,
371                        int exponent,
372                        double to_check) {
373  DiyFp lower_boundary;
374  DiyFp upper_boundary;
375  Bignum input_digits;
376  input_digits.AssignDecimalString(buffer);
377  if (to_check == 0.0) {
378    const double kMinDouble = 4e-324;
379    // Check that the buffer*10^exponent < (0 + kMinDouble)/2.
380    Double d(kMinDouble);
381    d.NormalizedBoundaries(&lower_boundary, &upper_boundary);
382    return CompareBignumToDiyFp(input_digits, exponent, lower_boundary) <= 0;
383  }
384  if (to_check == V8_INFINITY) {
385    const double kMaxDouble = 1.7976931348623157e308;
386    // Check that the buffer*10^exponent >= boundary between kMaxDouble and inf.
387    Double d(kMaxDouble);
388    d.NormalizedBoundaries(&lower_boundary, &upper_boundary);
389    return CompareBignumToDiyFp(input_digits, exponent, upper_boundary) >= 0;
390  }
391  Double d(to_check);
392  d.NormalizedBoundaries(&lower_boundary, &upper_boundary);
393  if ((d.Significand() & 1) == 0) {
394    return CompareBignumToDiyFp(input_digits, exponent, lower_boundary) >= 0 &&
395        CompareBignumToDiyFp(input_digits, exponent, upper_boundary) <= 0;
396  } else {
397    return CompareBignumToDiyFp(input_digits, exponent, lower_boundary) > 0 &&
398        CompareBignumToDiyFp(input_digits, exponent, upper_boundary) < 0;
399  }
400}
401
402
403// Copied from v8.cc and adapted to make the function deterministic.
404static uint32_t DeterministicRandom() {
405  // Random number generator using George Marsaglia's MWC algorithm.
406  static uint32_t hi = 0;
407  static uint32_t lo = 0;
408
409  // Initialization values don't have any special meaning. (They are the result
410  // of two calls to random().)
411  if (hi == 0) hi = 0xbfe166e7;
412  if (lo == 0) lo = 0x64d1c3c9;
413
414  // Mix the bits.
415  hi = 36969 * (hi & 0xFFFF) + (hi >> 16);
416  lo = 18273 * (lo & 0xFFFF) + (lo >> 16);
417  return (hi << 16) + (lo & 0xFFFF);
418}
419
420
421static const int kBufferSize = 1024;
422static const int kShortStrtodRandomCount = 2;
423static const int kLargeStrtodRandomCount = 2;
424
425TEST(RandomStrtod) {
426  char buffer[kBufferSize];
427  for (int length = 1; length < 15; length++) {
428    for (int i = 0; i < kShortStrtodRandomCount; ++i) {
429      int pos = 0;
430      for (int j = 0; j < length; ++j) {
431        buffer[pos++] = random() % 10 + '0';
432      }
433      int exponent = DeterministicRandom() % (25*2 + 1) - 25 - length;
434      buffer[pos] = '\0';
435      Vector<const char> vector(buffer, pos);
436      double strtod_result = Strtod(vector, exponent);
437      CHECK(CheckDouble(vector, exponent, strtod_result));
438    }
439  }
440  for (int length = 15; length < 800; length += 2) {
441    for (int i = 0; i < kLargeStrtodRandomCount; ++i) {
442      int pos = 0;
443      for (int j = 0; j < length; ++j) {
444        buffer[pos++] = random() % 10 + '0';
445      }
446      int exponent = DeterministicRandom() % (308*2 + 1) - 308 - length;
447      buffer[pos] = '\0';
448      Vector<const char> vector(buffer, pos);
449      double strtod_result = Strtod(vector, exponent);
450      CHECK(CheckDouble(vector, exponent, strtod_result));
451    }
452  }
453}
454