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/* -*- 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;
}