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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2022 Alan de Freitas (alandefreitas at gmail dot com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/boostorg/url | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_URL_GRAMMAR_IMPL_UNSIGNED_RULE_HPP | ||
| 11 | #define BOOST_URL_GRAMMAR_IMPL_UNSIGNED_RULE_HPP | ||
| 12 | |||
| 13 | #include <boost/url/grammar/error.hpp> | ||
| 14 | #include <boost/url/grammar/digit_chars.hpp> | ||
| 15 | #include <algorithm> // VFALCO grr.. | ||
| 16 | |||
| 17 | namespace boost { | ||
| 18 | namespace urls { | ||
| 19 | namespace grammar { | ||
| 20 | |||
| 21 | template<class U> | ||
| 22 | auto | ||
| 23 | 1682 | unsigned_rule<U>:: | |
| 24 | parse( | ||
| 25 | char const*& it, | ||
| 26 | char const* end | ||
| 27 | ) const noexcept -> | ||
| 28 | system::result<value_type> | ||
| 29 | { | ||
| 30 |
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1682 | if(it == end) |
| 31 | { | ||
| 32 | // end | ||
| 33 | 371 | BOOST_URL_RETURN_EC( | |
| 34 | error::mismatch); | ||
| 35 | } | ||
| 36 |
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1311 | if(*it == '0') |
| 37 | { | ||
| 38 | 49 | ++it; | |
| 39 |
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73 | if( it == end || |
| 40 |
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24 | ! digit_chars(*it)) |
| 41 | { | ||
| 42 | 43 | return U(0); | |
| 43 | } | ||
| 44 | // bad leading zero | ||
| 45 | 6 | BOOST_URL_RETURN_EC( | |
| 46 | error::invalid); | ||
| 47 | } | ||
| 48 |
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1262 | if(! digit_chars(*it)) |
| 49 | { | ||
| 50 | // expected digit | ||
| 51 | 871 | BOOST_URL_RETURN_EC( | |
| 52 | error::mismatch); | ||
| 53 | } | ||
| 54 | static constexpr U Digits10 = | ||
| 55 | std::numeric_limits< | ||
| 56 | U>::digits10; | ||
| 57 | static constexpr U ten = 10; | ||
| 58 | char const* safe_end; | ||
| 59 | 391 | if(static_cast<std::size_t>( | |
| 60 |
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391 | end - it) >= Digits10) |
| 61 | 185 | safe_end = it + Digits10; | |
| 62 | else | ||
| 63 | 206 | safe_end = end; | |
| 64 | 391 | U u = *it - '0'; | |
| 65 | 391 | ++it; | |
| 66 |
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1587 | while(it != safe_end && |
| 67 | 684 | digit_chars(*it)) | |
| 68 | { | ||
| 69 | 512 | char const dig = *it - '0'; | |
| 70 | 512 | u = u * ten + dig; | |
| 71 | 512 | ++it; | |
| 72 | } | ||
| 73 |
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642 | if( it != end && |
| 74 | 251 | digit_chars(*it)) | |
| 75 | { | ||
| 76 | static constexpr U Max = ( | ||
| 77 | std::numeric_limits< | ||
| 78 | U>::max)(); | ||
| 79 | static constexpr | ||
| 80 | auto div = (Max / ten); | ||
| 81 | static constexpr | ||
| 82 | char rem = (Max % ten); | ||
| 83 | 44 | char const dig = *it - '0'; | |
| 84 |
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44 | if( u > div || ( |
| 85 |
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31 | u == div && dig > rem)) |
| 86 | { | ||
| 87 | // integer overflow | ||
| 88 | 23 | BOOST_URL_RETURN_EC( | |
| 89 | error::invalid); | ||
| 90 | } | ||
| 91 | 21 | u = u * ten + dig; | |
| 92 | 21 | ++it; | |
| 93 |
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28 | if( it < end && |
| 94 | 7 | digit_chars(*it)) | |
| 95 | { | ||
| 96 | // integer overflow | ||
| 97 | 6 | BOOST_URL_RETURN_EC( | |
| 98 | error::invalid); | ||
| 99 | } | ||
| 100 | } | ||
| 101 | |||
| 102 | 362 | return u; | |
| 103 | } | ||
| 104 | |||
| 105 | } // grammar | ||
| 106 | } // urls | ||
| 107 | } // boost | ||
| 108 | |||
| 109 | #endif | ||
| 110 |