mirror of
https://github.com/Atmosphere-NX/Atmosphere
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105 lines
3.7 KiB
C++
105 lines
3.7 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include "os_utility.hpp"
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namespace ams::os::impl {
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namespace {
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constexpr void ExpandUnsignedValueToAsciiImpl(char *dst, u64 value) {
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/* Determine size needed. */
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constexpr size_t SizeNeeded = (BITSIZEOF(value) / 4) * sizeof(char);
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/* Write null-terminator. */
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dst[SizeNeeded] = '\x00';
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/* Write characters. */
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for (size_t i = 0; i < SizeNeeded; ++i) {
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/* Determine current character. */
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const auto nybble = (value & 0xF);
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const char cur_c = (nybble < 10) ? ('0' + nybble) : ('A' + nybble - 10);
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/* Write current character. */
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dst[SizeNeeded - 1 - i] = cur_c;
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/* Shift to next nybble. */
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value >>= 4;
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}
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}
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}
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void ExpandUnsignedValueToAscii(char *dst, u64 value) {
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return ExpandUnsignedValueToAsciiImpl(dst, value);
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}
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/* Test correctness. */
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#if 0
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namespace {
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consteval bool TestExpandUnsignedValueToAsciiImpl(const char *expected, u64 value) {
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/* Create buffer. */
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char buffer[17] = {
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'\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC', '\xCC'
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};
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/* Validate buffer is initially garbage. */
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for (size_t i = 0; i < util::size(buffer); ++i) {
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if (buffer[i] != '\xCC') {
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return false;
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}
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}
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/* Expand the value into the buffer. */
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ExpandUnsignedValueToAsciiImpl(buffer, value);
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/* Verify the result. */
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for (size_t i = 0; i < util::size(buffer); ++i) {
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if (buffer[i] != expected[i]) {
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return false;
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}
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}
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/* Verify null-termination. */
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if (buffer[util::size(buffer) - 1] != 0) {
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return false;
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}
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return true;
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}
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#define DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(v) static_assert(TestExpandUnsignedValueToAsciiImpl( #v , UINT64_C(0x##v)))
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(0000000000000000);
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(FFFFFFFFFFFFFFFF);
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(FFFFFFFF00000000);
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(00000000FFFFFFFF);
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(FFFF0000FFFF0000);
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(0000FFFF0000FFFF);
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(F0F0F0F0F0F0F0F0);
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(0F0F0F0F0F0F0F0F);
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(0123456789ABCDEF);
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(FEDCBA9876543210);
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DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL(A5A5A5A5A5A5A5A5);
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#undef DO_TEST_EXPAND_UNSIGNED_VALUE_TO_ASCII_IMPL
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}
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#endif
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}
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