#### Source code

#### Revision control

#### Copy as Markdown

#### Other Tools

```
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
```

```
* vim: set ts=8 sts=2 et sw=2 tw=80:
```

```
* This Source Code Form is subject to the terms of the Mozilla Public
```

```
* License, v. 2.0. If a copy of the MPL was not distributed with this
```

```
```

```
#ifndef util_DoubleToString_h
```

```
#define util_DoubleToString_h
```

```
```

```
/*
```

```
* Public interface to portable double-precision floating point to string
```

```
* and back conversion package.
```

```
*/
```

```
```

```
struct DtoaState;
```

```
```

```
namespace js {
```

```
```

```
extern DtoaState* NewDtoaState();
```

```
```

```
extern void DestroyDtoaState(DtoaState* state);
```

```
```

```
} // namespace js
```

```
```

```
/* Maximum number of characters (including trailing null) that a DTOSTR_STANDARD
```

```
* or DTOSTR_STANDARD_EXPONENTIAL conversion can produce. This maximum is
```

```
* reached for a number like -0.0000012345678901234567. */
```

```
#define DTOSTR_STANDARD_BUFFER_SIZE 26
```

```
```

```
/*
```

```
* DO NOT USE THIS FUNCTION IF YOU CAN AVOID IT. js::NumberToCString() is a
```

```
* better function to use.
```

```
*
```

```
* Convert d to a string in the given base. The integral part of d will be
```

```
* printed exactly in that base, regardless of how large it is, because there
```

```
* is no exponential notation for non-base-ten numbers. The fractional part
```

```
* will be rounded to as few digits as possible while still preserving the
```

```
* round-trip property (analogous to that of printing decimal numbers). In
```

```
* other words, if one were to read the resulting string in via a hypothetical
```

```
* base-number-reading routine that rounds to the nearest IEEE double (and to
```

```
* an even significand if there are two equally near doubles), then the result
```

```
* would equal d (except for -0.0, which converts to "0", and NaN, which is
```

```
* not equal to itself).
```

```
*
```

```
* Return nullptr if out of memory. If the result is not nullptr, it must be
```

```
* released via js_free().
```

```
*/
```

```
char* js_dtobasestr(DtoaState* state, int base, double d);
```

```
```

```
#endif /* util_DoubleToString_h */
```