include/boost/url/grammar/impl/unsigned_rule.hpp
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100.0% List of functions (2/3)
Functions (3)
| Line | TLA | Hits | Source Code |
|---|---|---|---|
| 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 | BOOST_URL_CXX20_CONSTEXPR | ||
| 23 | auto | ||
| 24 | 2224x | unsigned_rule<U>:: | |
| 25 | parse( | ||
| 26 | char const*& it, | ||
| 27 | char const* end | ||
| 28 | ) const noexcept -> | ||
| 29 | system::result<value_type> | ||
| 30 | { | ||
| 31 | 2224x | if(it == end) | |
| 32 | { | ||
| 33 | // end | ||
| 34 | 425x | BOOST_URL_CONSTEXPR_RETURN_EC( | |
| 35 | error::mismatch); | ||
| 36 | } | ||
| 37 | 1799x | if(*it == '0') | |
| 38 | { | ||
| 39 | 52x | ++it; | |
| 40 | 77x | if( it == end || | |
| 41 | 25x | ! digit_chars(*it)) | |
| 42 | { | ||
| 43 | 46x | return U(0); | |
| 44 | } | ||
| 45 | // bad leading zero | ||
| 46 | 6x | BOOST_URL_CONSTEXPR_RETURN_EC( | |
| 47 | error::invalid); | ||
| 48 | } | ||
| 49 | 1747x | if(! digit_chars(*it)) | |
| 50 | { | ||
| 51 | // expected digit | ||
| 52 | 1045x | BOOST_URL_CONSTEXPR_RETURN_EC( | |
| 53 | error::mismatch); | ||
| 54 | } | ||
| 55 | 702x | constexpr U Digits10 = | |
| 56 | std::numeric_limits< | ||
| 57 | U>::digits10; | ||
| 58 | 702x | constexpr U ten = 10; | |
| 59 | 702x | char const* safe_end = nullptr; | |
| 60 | 702x | if(static_cast<std::size_t>( | |
| 61 | 702x | end - it) >= Digits10) | |
| 62 | 298x | safe_end = it + Digits10; | |
| 63 | else | ||
| 64 | 404x | safe_end = end; | |
| 65 | 702x | U u = *it - '0'; | |
| 66 | 702x | ++it; | |
| 67 | 2932x | while(it != safe_end && | |
| 68 | 1218x | digit_chars(*it)) | |
| 69 | { | ||
| 70 | 1012x | char const dig = *it - '0'; | |
| 71 | 1012x | u = u * ten + dig; | |
| 72 | 1012x | ++it; | |
| 73 | } | ||
| 74 | 1072x | if( it != end && | |
| 75 | 370x | digit_chars(*it)) | |
| 76 | { | ||
| 77 | 45x | constexpr U Max = ( | |
| 78 | std::numeric_limits< | ||
| 79 | U>::max)(); | ||
| 80 | constexpr | ||
| 81 | 45x | auto div = (Max / ten); | |
| 82 | constexpr | ||
| 83 | 45x | char rem = (Max % ten); | |
| 84 | 45x | char const dig = *it - '0'; | |
| 85 | 45x | if( u > div || ( | |
| 86 | 32x | u == div && dig > rem)) | |
| 87 | { | ||
| 88 | // integer overflow | ||
| 89 | 23x | BOOST_URL_CONSTEXPR_RETURN_EC( | |
| 90 | error::invalid); | ||
| 91 | } | ||
| 92 | 22x | u = u * ten + dig; | |
| 93 | 22x | ++it; | |
| 94 | 30x | if( it < end && | |
| 95 | 8x | digit_chars(*it)) | |
| 96 | { | ||
| 97 | // integer overflow | ||
| 98 | 6x | BOOST_URL_CONSTEXPR_RETURN_EC( | |
| 99 | error::invalid); | ||
| 100 | } | ||
| 101 | } | ||
| 102 | |||
| 103 | 673x | return u; | |
| 104 | } | ||
| 105 | |||
| 106 | } // grammar | ||
| 107 | } // urls | ||
| 108 | } // boost | ||
| 109 | |||
| 110 | #endif | ||
| 111 |