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