strtod.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2019 Tobias Hienzsch
 
#ifndef TETL_CSTDLIB_STRTOD_HPP
#define TETL_CSTDLIB_STRTOD_HPP
 
#include <etl/_strings/to_floating_point.hpp>
 
namespace etl {
 
/// \brief Interprets a floating point value in a byte string pointed to by str.
/// \param str Pointer to the null-terminated byte string to be interpreted.
/// \param last Pointer to a pointer to character.
/// \returns Floating point value corresponding to the contents of str on
/// success. If the converted value falls out of range of corresponding return
/// type, range error occurs and HUGE_VAL, HUGE_VALF or HUGE_VALL is returned.
/// If no conversion can be performed, `0` is returned and *last is set to str.
[[nodiscard]] constexpr auto strtod(char const* str, char const** last = nullptr) noexcept -> double
{
    auto result = strings::to_floating_point<double>(str);
    if (last != nullptr) {
        *last = result.end;
    }
    return result.value;
}
 
} // namespace etl
 
#endif // TETL_CSTDLIB_STRTOD_HPP