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
13 using namespace v8::internal;
14
StringToVector(const char * str)15 static Vector<const char> StringToVector(const char* str) {
16 return Vector<const char>(str, StrLength(str));
17 }
18
19
StrtodChar(const char * str,int exponent)20 static double StrtodChar(const char* str, int exponent) {
21 return Strtod(StringToVector(str), exponent);
22 }
23
24
TEST(Strtod)25 TEST(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
CompareBignumToDiyFp(const Bignum & bignum_digits,int bignum_exponent,DiyFp diy_fp)349 static 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
CheckDouble(Vector<const char> buffer,int exponent,double to_check)370 static 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.
DeterministicRandom()404 static 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
421 static const int kBufferSize = 1024;
422 static const int kShortStrtodRandomCount = 2;
423 static const int kLargeStrtodRandomCount = 2;
424
TEST(RandomStrtod)425 TEST(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