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https://github.com/portapack-mayhem/mayhem-firmware.git
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6574272ca8
* Show .1 MHz in pretty freqman string * Refactor load to user FreqmanDB * Recon file parsing cleanup * use strtol for parse_int * recon file cleanup * Fix bugs in Recon changes * PR feedback --------- Co-authored-by: kallanreed <kallanreed@noreply.github.com>
92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
/*
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* Copyright (C) 2023 Kyle Reed
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*
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* This file is part of PortaPack.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for 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; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __CONVERT_H__
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#define __CONVERT_H__
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#include <cstdlib>
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#include <cstring>
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#include <limits>
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#include <string>
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#include <string_view>
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#include <type_traits>
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constexpr size_t max_parse_int_length = 64;
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/* This undefined type is used to see the size of the
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* unhandled type and to create a compilation error. */
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template <size_t N>
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struct UnhandledSize;
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/* Returns true when errno is ERANGE. */
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inline bool range_error() {
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return errno == ERANGE;
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}
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/* Assigns 'value' to 'out_val' and returns true if 'value' is
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* in bounds for type TOut. */
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template <typename TVal, typename TOut>
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bool checked_assign(TVal value, TOut& out_val) {
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// No chance for overflow, just return.
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if constexpr (sizeof(TVal) <= sizeof(TOut)) {
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out_val = value;
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return true;
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}
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out_val = static_cast<TOut>(value);
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return value >= static_cast<TVal>(std::numeric_limits<TOut>::min()) &&
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value <= static_cast<TVal>(std::numeric_limits<TOut>::max());
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}
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/* Zero-allocation conversion helper. 'str' must be smaller than 'max_parse_int_length'. */
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template <typename T>
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std::enable_if_t<std::is_integral_v<T>, bool> parse_int(std::string_view str, T& out_val, int base = 10) {
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// Always initialize the output.
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out_val = {};
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if (str.size() > max_parse_int_length)
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return false;
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// Copy onto the stack and null terminate.
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char zstr[max_parse_int_length + 1];
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std::memcpy(zstr, str.data(), str.size());
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zstr[str.size()] = '\0';
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// A little C++ type magic to select the correct conversion function.
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if constexpr (sizeof(T) == sizeof(long long)) {
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if constexpr (std::is_unsigned_v<T>)
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return checked_assign(strtoull(zstr, nullptr, base), out_val) && !range_error();
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else
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return checked_assign(strtoll(zstr, nullptr, base), out_val) && !range_error();
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} else if constexpr (sizeof(T) <= sizeof(long)) {
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if constexpr (std::is_unsigned_v<T>)
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return checked_assign(strtoul(zstr, nullptr, base), out_val) && !range_error();
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else
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return checked_assign(strtol(zstr, nullptr, base), out_val) && !range_error();
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} else {
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UnhandledSize<sizeof(T) * 8> unhandled_case;
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return false;
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}
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return true;
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}
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#endif /*__CONVERT_H__*/ |