| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.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_DETAIL_MOVE_CHARS_HPP | ||
| 11 | #define BOOST_URL_DETAIL_MOVE_CHARS_HPP | ||
| 12 | |||
| 13 | #include <boost/core/detail/string_view.hpp> | ||
| 14 | #include <boost/assert.hpp> | ||
| 15 | #include <cstring> | ||
| 16 | #include <functional> | ||
| 17 | |||
| 18 | namespace boost { | ||
| 19 | namespace urls { | ||
| 20 | namespace detail { | ||
| 21 | |||
| 22 | // Moves characters, and adjusts any passed | ||
| 23 | // views if they point to any moved characters. | ||
| 24 | |||
| 25 | // true if s completely overlapped by buf | ||
| 26 | inline | ||
| 27 | bool | ||
| 28 | 1288 | is_overlapping( | |
| 29 | core::string_view buf, | ||
| 30 | core::string_view s) noexcept | ||
| 31 | { | ||
| 32 | 1288 | auto const b0 = buf.data(); | |
| 33 | 1288 | auto const e0 = b0 + buf.size(); | |
| 34 | 1288 | auto const b1 = s.data(); | |
| 35 | 1288 | auto const e1 = b1 + s.size(); | |
| 36 | auto const less_equal = | ||
| 37 | std::less_equal<char const*>(); | ||
| 38 |
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1288 | if(less_equal(e0, b1)) |
| 39 | 88 | return false; | |
| 40 |
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1200 | if(less_equal(e1, b0)) |
| 41 | 1198 | return false; | |
| 42 | // partial overlap is undefined | ||
| 43 |
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2 | BOOST_ASSERT(less_equal(e1, e0)); |
| 44 |
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2 | BOOST_ASSERT(less_equal(b0, b1)); |
| 45 | 2 | return true; | |
| 46 | } | ||
| 47 | |||
| 48 | inline | ||
| 49 | void | ||
| 50 | 1924 | move_chars_impl( | |
| 51 | std::ptrdiff_t, | ||
| 52 | core::string_view const&) noexcept | ||
| 53 | { | ||
| 54 | 1924 | } | |
| 55 | |||
| 56 | template<class... Sn> | ||
| 57 | void | ||
| 58 | 2576 | move_chars_impl( | |
| 59 | std::ptrdiff_t d, | ||
| 60 | core::string_view const& buf, | ||
| 61 | core::string_view& s, | ||
| 62 | Sn&... sn) noexcept | ||
| 63 | { | ||
| 64 |
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2576 | if(is_overlapping(buf, s)) |
| 65 | 4 | s = {s.data() + d, s.size()}; | |
| 66 | 2576 | move_chars_impl(d, buf, sn...); | |
| 67 | 2576 | } | |
| 68 | |||
| 69 | template<class... Args> | ||
| 70 | void | ||
| 71 | 3848 | move_chars( | |
| 72 | char* dest, | ||
| 73 | char const* src, | ||
| 74 | std::size_t n, | ||
| 75 | Args&... args) noexcept | ||
| 76 | { | ||
| 77 | 3848 | move_chars_impl( | |
| 78 | dest - src, | ||
| 79 | 3848 | core::string_view(src, n), | |
| 80 | args...); | ||
| 81 | 3848 | std::memmove( | |
| 82 | dest, src, n); | ||
| 83 | 3848 | } | |
| 84 | |||
| 85 | } // detail | ||
| 86 | } // urls | ||
| 87 | } // boost | ||
| 88 | |||
| 89 | #endif | ||
| 90 |