1// Copyright 2010 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_BASE_NUMBERS_FIXED_DTOA_H_
6#define V8_BASE_NUMBERS_FIXED_DTOA_H_
7
8#include "src/base/vector.h"
9
10namespace v8 {
11namespace base {
12
13// Produces digits necessary to print a given number with
14// 'fractional_count' digits after the decimal point.
15// The buffer must be big enough to hold the result plus one terminating null
16// character.
17//
18// The produced digits might be too short in which case the caller has to fill
19// the gaps with '0's.
20// Example: FastFixedDtoa(0.001, 5, ...) is allowed to return buffer = "1", and
21// decimal_point = -2.
22// Halfway cases are rounded towards +/-Infinity (away from 0). The call
23// FastFixedDtoa(0.15, 2, ...) thus returns buffer = "2", decimal_point = 0.
24// The returned buffer may contain digits that would be truncated from the
25// shortest representation of the input.
26//
27// This method only works for some parameters. If it can't handle the input it
28// returns false. The output is null-terminated when the function succeeds.
29V8_BASE_EXPORT bool FastFixedDtoa(double v, int fractional_count,
30                                  Vector<char> buffer, int* length,
31                                  int* decimal_point);
32
33}  // namespace base
34}  // namespace v8
35
36#endif  // V8_BASE_NUMBERS_FIXED_DTOA_H_
37