| Hal Canary | 3c36ef6 | 2018-01-02 16:25:53 -0500 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2017 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #ifndef SkFloatToDecimal_DEFINED |
| 9 | #define SkFloatToDecimal_DEFINED |
| 10 | |
| 11 | constexpr unsigned kMaximumSkFloatToDecimalLength = 49; |
| 12 | |
| 13 | /** \fn SkFloatToDecimal |
| 14 | Convert a float into a decimal string. |
| 15 | |
| 16 | The resulting string will be in the form `[-]?([0-9]*\.)?[0-9]+` (It does |
| 17 | not use scientific notation.) and `sscanf(output, "%f", &x)` will return |
| 18 | the original value if the value is finite. This function accepts all |
| 19 | possible input values. |
| 20 | |
| 21 | INFINITY and -INFINITY are rounded to FLT_MAX and -FLT_MAX. |
| 22 | |
| 23 | NAN values are converted to 0. |
| 24 | |
| 25 | This function will always add a terminating '\0' to the output. |
| 26 | |
| 27 | @param value Any floating-point number |
| 28 | @param output The buffer to write the string into. Must be non-null. |
| 29 | |
| 30 | @return strlen(output) |
| 31 | */ |
| 32 | unsigned SkFloatToDecimal(float value, char output[kMaximumSkFloatToDecimalLength]); |
| 33 | |
| 34 | #endif // SkFloatToDecimal_DEFINED |