forked from mirrors/gecko-dev
56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsExceptionHandlerUtils.h"
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#include "double-conversion/double-conversion.h"
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// Format a non-negative double to a string, without using C-library functions,
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// which need to be avoided (.e.g. bug 1240160, comment 10). Return false if
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// we failed to get the formatting done correctly.
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bool SimpleNoCLibDtoA(double aValue, char* aBuffer, int aBufferLength)
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{
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// aBufferLength is the size of the buffer. Be paranoid.
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aBuffer[aBufferLength-1] = '\0';
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if (aValue < 0) {
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return false;
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}
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int length, point, i;
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bool sign;
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bool ok = true;
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double_conversion::DoubleToStringConverter::DoubleToAscii(
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aValue,
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double_conversion::DoubleToStringConverter::SHORTEST,
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8,
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aBuffer,
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aBufferLength,
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&sign,
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&length,
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&point);
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// length does not account for the 0 terminator.
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if (length > point && (length+1) < (aBufferLength-1)) {
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// We have to insert a decimal point. Not worried about adding a leading zero
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// in the < 1 (point == 0) case.
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aBuffer[length+1] = '\0';
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for (i=length; i>point; i-=1) {
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aBuffer[i] = aBuffer[i-1];
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}
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aBuffer[i] = '.'; // Not worried about locales
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} else if (length < point) {
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// Trailing zeros scenario
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for (i=length; i<point; i+=1) {
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if (i >= aBufferLength-2) {
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ok = false;
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}
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aBuffer[i] = '0';
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}
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aBuffer[i] = '\0';
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}
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return ok;
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}
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