. /include/boost/url /detail /move_chars.hpp
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1   // 1   //
2   // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) 2   // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
3   // 3   //
4   // Distributed under the Boost Software License, Version 1.0. (See accompanying 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) 5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6   // 6   //
7   // Official repository: https://github.com/boostorg/url 7   // Official repository: https://github.com/boostorg/url
8   // 8   //
9   9  
10   #ifndef BOOST_URL_DETAIL_MOVE_CHARS_HPP 10   #ifndef BOOST_URL_DETAIL_MOVE_CHARS_HPP
11   #define BOOST_URL_DETAIL_MOVE_CHARS_HPP 11   #define BOOST_URL_DETAIL_MOVE_CHARS_HPP
12   12  
13   #include <boost/core/detail/string_view.hpp> 13   #include <boost/core/detail/string_view.hpp>
14   #include <boost/assert.hpp> 14   #include <boost/assert.hpp>
15   #include <cstring> 15   #include <cstring>
16   #include <functional> 16   #include <functional>
17   17  
18   namespace boost { 18   namespace boost {
19   namespace urls { 19   namespace urls {
20   namespace detail { 20   namespace detail {
21   21  
22   // Moves characters, and adjusts any passed 22   // Moves characters, and adjusts any passed
23   // views if they point to any moved characters. 23   // views if they point to any moved characters.
24   24  
25   // true if s completely overlapped by buf 25   // true if s completely overlapped by buf
26   inline 26   inline
27   bool 27   bool
HITCBC 28   5539 is_overlapping( 28   5543 is_overlapping(
29   core::string_view buf, 29   core::string_view buf,
30   core::string_view s) noexcept 30   core::string_view s) noexcept
31   { 31   {
HITCBC 32   5539 auto const b0 = buf.data(); 32   5543 auto const b0 = buf.data();
HITCBC 33   5539 auto const e0 = b0 + buf.size(); 33   5543 auto const e0 = b0 + buf.size();
HITCBC 34   5539 auto const b1 = s.data(); 34   5543 auto const b1 = s.data();
HITCBC 35   5539 auto const e1 = b1 + s.size(); 35   5543 auto const e1 = b1 + s.size();
36   auto const less_equal = 36   auto const less_equal =
37   std::less_equal<char const*>(); 37   std::less_equal<char const*>();
HITCBC 38   5539 if(less_equal(e0, b1)) 38   5543 if(less_equal(e0, b1))
HITCBC 39   2020 return false; 39   2020 return false;
HITCBC 40   3519 if(less_equal(e1, b0)) 40   3523 if(less_equal(e1, b0))
HITCBC 41   3517 return false; 41   3521 return false;
42   // partial overlap is undefined 42   // partial overlap is undefined
HITCBC 43   2 BOOST_ASSERT(less_equal(e1, e0)); 43   2 BOOST_ASSERT(less_equal(e1, e0));
HITCBC 44   2 BOOST_ASSERT(less_equal(b0, b1)); 44   2 BOOST_ASSERT(less_equal(b0, b1));
HITCBC 45   2 return true; 45   2 return true;
46   } 46   }
47   47  
48   inline 48   inline
49   void 49   void
HITCBC 50   6847 move_chars_impl( 50   6849 move_chars_impl(
51   std::ptrdiff_t, 51   std::ptrdiff_t,
52   core::string_view const&) noexcept 52   core::string_view const&) noexcept
53   { 53   {
HITCBC 54   6847 } 54   6849 }
55   55  
56   template<class... Sn> 56   template<class... Sn>
57   void 57   void
HITCBC 58   5539 move_chars_impl( 58   5543 move_chars_impl(
59   std::ptrdiff_t d, 59   std::ptrdiff_t d,
60   core::string_view const& buf, 60   core::string_view const& buf,
61   core::string_view& s, 61   core::string_view& s,
62   Sn&... sn) noexcept 62   Sn&... sn) noexcept
63   { 63   {
HITCBC 64   5539 if(is_overlapping(buf, s)) 64   5543 if(is_overlapping(buf, s))
HITCBC 65   2 s = {s.data() + d, s.size()}; 65   2 s = {s.data() + d, s.size()};
HITCBC 66   5539 move_chars_impl(d, buf, sn...); 66   5543 move_chars_impl(d, buf, sn...);
HITCBC 67   5539 } 67   5543 }
68   68  
69   template<class... Args> 69   template<class... Args>
70   void 70   void
HITCBC 71   6847 move_chars( 71   6849 move_chars(
72   char* dest, 72   char* dest,
73   char const* src, 73   char const* src,
74   std::size_t n, 74   std::size_t n,
75   Args&... args) noexcept 75   Args&... args) noexcept
76   { 76   {
HITCBC 77   6847 move_chars_impl( 77   6849 move_chars_impl(
78   dest - src, 78   dest - src,
HITCBC 79   6847 core::string_view(src, n), 79   6849 core::string_view(src, n),
80   args...); 80   args...);
HITCBC 81   6847 std::memmove( 81   6849 std::memmove(
82   dest, src, n); 82   dest, src, n);
HITCBC 83   6847 } 83   6849 }
84   84  
85   } // detail 85   } // detail
86   } // urls 86   } // urls
87   } // boost 87   } // boost
88   88  
89   #endif 89   #endif