1/*
2 * Copyright (C) 2019 Apple Inc. All rights reserved.
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20#include "config.h"
21#include "HexNumber.h"
22
23namespace WTF {
24
25namespace Internal {
26
27std::pair<LChar*, unsigned> appendHex(LChar* buffer, unsigned bufferSize, std::uintmax_t number, unsigned minimumDigits, HexConversionMode mode)
28{
29 auto end = buffer + bufferSize;
30 auto start = end;
31 auto hexDigits = hexDigitsForMode(mode);
32 do {
33 *--start = hexDigits[number & 0xF];
34 number >>= 4;
35 } while (number);
36 auto startWithLeadingZeros = end - std::min(minimumDigits, bufferSize);
37 if (start > startWithLeadingZeros) {
38 std::memset(startWithLeadingZeros, '0', start - startWithLeadingZeros);
39 start = startWithLeadingZeros;
40 }
41 return { start, end - start };
42}
43
44}
45
46} // namespace WTF
47