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| 1 // Copyright 2010 the V8 project authors. All rights reserved. | 1 // Copyright 2011 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. |
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| 40 // For instance fixed(0.1, 4) becomes 0.1000 | 40 // For instance fixed(0.1, 4) becomes 0.1000 |
| 41 // If the input number is big, the output will be big. | 41 // If the input number is big, the output will be big. |
| 42 DTOA_FIXED, | 42 DTOA_FIXED, |
| 43 // Return a fixed number of digits, no matter what the exponent is. | 43 // Return a fixed number of digits, no matter what the exponent is. |
| 44 DTOA_PRECISION | 44 DTOA_PRECISION |
| 45 }; | 45 }; |
| 46 | 46 |
| 47 // The maximal length of digits a double can have in base 10. | 47 // The maximal length of digits a double can have in base 10. |
| 48 // Note that DoubleToAscii null-terminates its input. So the given buffer should | 48 // Note that DoubleToAscii null-terminates its input. So the given buffer should |
| 49 // be at least kBase10MaximalLength + 1 characters long. | 49 // be at least kBase10MaximalLength + 1 characters long. |
| 50 static const int kBase10MaximalLength = 17; | 50 const int kBase10MaximalLength = 17; |
| 51 | 51 |
| 52 // Converts the given double 'v' to ascii. | 52 // Converts the given double 'v' to ascii. |
| 53 // The result should be interpreted as buffer * 10^(point-length). | 53 // The result should be interpreted as buffer * 10^(point-length). |
| 54 // | 54 // |
| 55 // The output depends on the given mode: | 55 // The output depends on the given mode: |
| 56 // - SHORTEST: produce the least amount of digits for which the internal | 56 // - SHORTEST: produce the least amount of digits for which the internal |
| 57 // identity requirement is still satisfied. If the digits are printed | 57 // identity requirement is still satisfied. If the digits are printed |
| 58 // (together with the correct exponent) then reading this number will give | 58 // (together with the correct exponent) then reading this number will give |
| 59 // 'v' again. The buffer will choose the representation that is closest to | 59 // 'v' again. The buffer will choose the representation that is closest to |
| 60 // 'v'. If there are two at the same distance, than the one farther away | 60 // 'v'. If there are two at the same distance, than the one farther away |
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| 76 // 'DoubleToAscii' expects the given buffer to be big enough to hold all digits | 76 // 'DoubleToAscii' expects the given buffer to be big enough to hold all digits |
| 77 // and a terminating null-character. In SHORTEST-mode it expects a buffer of | 77 // and a terminating null-character. In SHORTEST-mode it expects a buffer of |
| 78 // at least kBase10MaximalLength + 1. Otherwise, the size of the output is | 78 // at least kBase10MaximalLength + 1. Otherwise, the size of the output is |
| 79 // limited to requested_digits digits plus the null terminator. | 79 // limited to requested_digits digits plus the null terminator. |
| 80 void DoubleToAscii(double v, DtoaMode mode, int requested_digits, | 80 void DoubleToAscii(double v, DtoaMode mode, int requested_digits, |
| 81 Vector<char> buffer, int* sign, int* length, int* point); | 81 Vector<char> buffer, int* sign, int* length, int* point); |
| 82 | 82 |
| 83 } } // namespace v8::internal | 83 } } // namespace v8::internal |
| 84 | 84 |
| 85 #endif // V8_DTOA_H_ | 85 #endif // V8_DTOA_H_ |
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