Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame^] | 1 | // Copyright 2010 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 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. |
| 27 | |
| 28 | #ifndef V8_FAST_DTOA_H_ |
| 29 | #define V8_FAST_DTOA_H_ |
| 30 | |
| 31 | namespace v8 { |
| 32 | namespace internal { |
| 33 | |
| 34 | // FastDtoa will produce at most kFastDtoaMaximalLength digits. This does not |
| 35 | // include the terminating '\0' character. |
| 36 | static const int kFastDtoaMaximalLength = 17; |
| 37 | |
| 38 | // Provides a decimal representation of v. |
| 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. |
| 41 | // There will be *length digits inside the buffer followed by a null terminator. |
| 42 | // If the function returns true then |
| 43 | // v == (double) (buffer * 10^(point - length)). |
| 44 | // The digits in the buffer are the shortest representation possible: no |
| 45 | // 0.099999999999 instead of 0.1. |
| 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 |
| 48 | // one closest to v. |
| 49 | // The variable 'sign' will be '0' if the given number is positive, and '1' |
| 50 | // otherwise. |
| 51 | bool FastDtoa(double d, |
| 52 | Vector<char> buffer, |
| 53 | int* sign, |
| 54 | int* length, |
| 55 | int* point); |
| 56 | |
| 57 | } } // namespace v8::internal |
| 58 | |
| 59 | #endif // V8_FAST_DTOA_H_ |