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1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2010 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
11 // with the distribution. | 11 // with the distribution. |
12 // * Neither the name of Google Inc. nor the names of its | 12 // * Neither the name of Google Inc. nor the names of its |
13 // contributors may be used to endorse or promote products derived | 13 // contributors may be used to endorse or promote products derived |
14 // from this software without specific prior written permission. | 14 // from this software without specific prior written permission. |
15 // | 15 // |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | 27 |
28 #ifndef V8_GRISU3_H_ | 28 #ifndef V8_FAST_DTOA_H_ |
29 #define V8_GRISU3_H_ | 29 #define V8_FAST_DTOA_H_ |
30 | 30 |
31 namespace v8 { | 31 namespace v8 { |
32 namespace internal { | 32 namespace internal { |
33 | 33 |
34 // Grisu3 will produce at most kGrisu3MaximalLength digits. This does not | 34 // FastDtoa will produce at most kFastDtoaMaximalLength digits. This does not |
35 // include the terminating '\0' character. | 35 // include the terminating '\0' character. |
36 static const int kGrisu3MaximalLength = 17; | 36 static const int kFastDtoaMaximalLength = 17; |
37 | 37 |
38 // Provides a decimal representation of v. | 38 // Provides a decimal representation of v. |
39 // v must satisfy v != 0 and it must not be Infinity or NaN. | 39 // v must not be (positive or negative) zero and it must not be Infinity or NaN. |
40 // Returns true if it succeeds, otherwise the result can not be trusted. | 40 // Returns true if it succeeds, otherwise the result can not be trusted. |
41 // There will be *length digits inside the buffer followed by a null terminator. | 41 // There will be *length digits inside the buffer followed by a null terminator. |
42 // If the function returns true then | 42 // If the function returns true then |
43 // v == (double) (buffer * 10^(decimal-point - length)). | 43 // v == (double) (buffer * 10^(point - length)). |
44 // The digits in the buffer are the shortest representation possible: no | 44 // The digits in the buffer are the shortest representation possible: no |
45 // 0.099999999999 instead of 0.1. | 45 // 0.099999999999 instead of 0.1. |
46 // The last digit will be closest to the actual v. That is, even if several | 46 // The last digit will be closest to the actual v. That is, even if several |
47 // digits might correctly yield 'v' when read again, the buffer will contain the | 47 // digits might correctly yield 'v' when read again, the buffer will contain the |
48 // one closest to v. | 48 // one closest to v. |
49 // The variable 'sign' will be '0' if the given number is positive, and '1' | 49 // The variable 'sign' will be '0' if the given number is positive, and '1' |
50 // otherwise. | 50 // otherwise. |
51 bool grisu3(double d, char* buffer, int* sign, int* length, int* decimal_point); | 51 bool FastDtoa(double d, char* buffer, int* sign, int* length, int* point); |
52 | 52 |
53 } } // namespace v8::internal | 53 } } // namespace v8::internal |
54 | 54 |
55 #endif // V8_GRISU3_H_ | 55 #endif // V8_FAST_DTOA_H_ |
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