125f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// Copyright 2010 the V8 project authors. All rights reserved. 2b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// Use of this source code is governed by a BSD-style license that can be 3b8a8cc1952d61a2f3a2568848933943a543b5d3eBen Murdoch// found in the LICENSE file. 425f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen 525f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen#ifndef V8_FIXED_DTOA_H_ 625f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen#define V8_FIXED_DTOA_H_ 725f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen 8014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch#include "src/vector.h" 9014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch 1025f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsennamespace v8 { 1125f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsennamespace internal { 1225f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen 1325f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// Produces digits necessary to print a given number with 1425f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// 'fractional_count' digits after the decimal point. 1525f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// The buffer must be big enough to hold the result plus one terminating null 1625f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// character. 1725f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// 1825f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// The produced digits might be too short in which case the caller has to fill 1925f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// the gaps with '0's. 2025f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// Example: FastFixedDtoa(0.001, 5, ...) is allowed to return buffer = "1", and 2125f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// decimal_point = -2. 2225f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// Halfway cases are rounded towards +/-Infinity (away from 0). The call 2325f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// FastFixedDtoa(0.15, 2, ...) thus returns buffer = "2", decimal_point = 0. 2425f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// The returned buffer may contain digits that would be truncated from the 2525f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// shortest representation of the input. 2625f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// 2725f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// This method only works for some parameters. If it can't handle the input it 2825f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen// returns false. The output is null-terminated when the function succeeds. 2925f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsenbool FastFixedDtoa(double v, int fractional_count, 3025f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen Vector<char> buffer, int* length, int* decimal_point); 3125f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen 32014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch} // namespace internal 33014dc512cdd3e367bee49a713fdc5ed92584a3e5Ben Murdoch} // namespace v8 3425f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen 3525f6136652d8341ed047e7fc1a450af5bd218ea9Kristian Monsen#endif // V8_FIXED_DTOA_H_ 36