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//
 
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
 
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//
 
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
 
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
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//
 
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// Official repository: https://github.com/boostorg/url
 
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//
 
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#include <boost/url/detail/config.hpp>
 
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#include <boost/url/grammar/charset.hpp>
 
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#include <boost/url/grammar/dec_octet_rule.hpp>
 
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#include <boost/url/grammar/digit_chars.hpp>
 
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#include <boost/url/grammar/error.hpp>
 
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namespace boost {
 
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namespace urls {
 
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namespace grammar {
 
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namespace implementation_defined {
 
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auto
 
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dec_octet_rule_t::
 
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parse(
 
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    char const*& it,
 
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    char const* const end
 
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        ) const noexcept ->
 
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    system::result<value_type>
 
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{
 
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    if(it == end)
 
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    {
 
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        // end
 
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        BOOST_URL_RETURN_EC(
 
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            error::mismatch);
 
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    }
 
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    if(! digit_chars(*it))
 
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    {
 
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        // expected DIGIT
 
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        BOOST_URL_RETURN_EC(
 
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            error::mismatch);
 
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    }
 
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    unsigned v = *it - '0';
 
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    ++it;
 
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    if( it == end ||
 
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        ! digit_chars(*it))
 
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    {
 
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        return static_cast<
 
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            value_type>(v);
 
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    }
 
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    if(v == 0)
 
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    {
 
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        // leading '0'
 
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        BOOST_URL_RETURN_EC(
 
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            error::invalid);
 
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    }
 
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    v = (10 * v) + *it - '0';
 
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    ++it;
 
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    if( it == end ||
 
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        ! digit_chars(*it))
 
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    {
 
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        return static_cast<
 
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            value_type>(v);
 
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    }
 
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    if(v > 25)
 
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    {
 
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        // integer overflow
 
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        BOOST_URL_RETURN_EC(
 
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            error::invalid);
 
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    }
 
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    v = (10 * v) + *it - '0';
 
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    if(v > 255)
 
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    {
 
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        // integer overflow
 
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        BOOST_URL_RETURN_EC(
 
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            error::invalid);
 
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    }
 
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    ++it;
 
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    if( it != end &&
 
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        digit_chars(*it))
 
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    {
 
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        // integer overflow
 
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        BOOST_URL_RETURN_EC(
 
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            error::invalid);
 
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    }
 
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    return static_cast<
 
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        value_type>(v);
 
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}
 
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} // implementation_defined
 
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} // grammar
 
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} // urls
 
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} // boost
 
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