/* -*- 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

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsExceptionHandlerUtils.h"

#include "double-conversion/double-conversion.h"

// Format a non-negative double to a string, without using C-library functions,

// which need to be avoided (.e.g. bug 1240160, comment 10).  Return false if

// we failed to get the formatting done correctly.

bool SimpleNoCLibDtoA(double aValue, char* aBuffer, int aBufferLength)

{

  // aBufferLength is the size of the buffer.  Be paranoid.

  aBuffer[aBufferLength-1] = '\0';

  if (aValue < 0) {

    return false;

  }

  int length, point, i;

  bool sign;

  bool ok = true;

  double_conversion::DoubleToStringConverter::DoubleToAscii(

                                     aValue,

                                     double_conversion::DoubleToStringConverter::SHORTEST,

                                     8,

                                     aBuffer,

                                     aBufferLength,

                                     &sign,

                                     &length,

                                     &point);

  // length does not account for the 0 terminator.

  if (length > point && (length+1) < (aBufferLength-1)) {

    // We have to insert a decimal point.  Not worried about adding a leading zero

    // in the < 1 (point == 0) case.

    aBuffer[length+1] = '\0';

    for (i=length; i>point; i-=1) {

      aBuffer[i] = aBuffer[i-1];

    }

    aBuffer[i] = '.'; // Not worried about locales

  } else if (length < point) {

    // Trailing zeros scenario

    for (i=length; i<point; i+=1) {

      if (i >= aBufferLength-2) {

        ok = false;

      }

      aBuffer[i] = '0';

    }

    aBuffer[i] = '\0';

  }

  return ok;

}