. /src /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/CPPAlliance/http 7   // Official repository: https://github.com/CPPAlliance/http
8   // 8   //
9   9  
10   #ifndef BOOST_HTTP_DETAIL_MOVE_CHARS_HPP 10   #ifndef BOOST_HTTP_DETAIL_MOVE_CHARS_HPP
11   #define BOOST_HTTP_DETAIL_MOVE_CHARS_HPP 11   #define BOOST_HTTP_DETAIL_MOVE_CHARS_HPP
12   12  
13   #include <boost/core/detail/string_view.hpp> 13   #include <boost/core/detail/string_view.hpp>
14   #include <cstring> 14   #include <cstring>
15   #include <functional> 15   #include <functional>
16   16  
17   namespace boost { 17   namespace boost {
18   namespace http { 18   namespace http {
19   namespace detail { 19   namespace detail {
20   20  
21   // Moves characters, and adjusts any passed 21   // Moves characters, and adjusts any passed
22   // views if they point to any moved characters. 22   // views if they point to any moved characters.
23   23  
24   // true if s completely overlapped by buf 24   // true if s completely overlapped by buf
25   inline 25   inline
26   bool 26   bool
HITCBC 27   198 is_overlapping( 27   198 is_overlapping(
28   core::string_view buf, 28   core::string_view buf,
29   core::string_view s) noexcept 29   core::string_view s) noexcept
30   { 30   {
HITCBC 31   198 auto const b0 = buf.data(); 31   198 auto const b0 = buf.data();
HITCBC 32   198 auto const e0 = b0 + buf.size(); 32   198 auto const e0 = b0 + buf.size();
HITCBC 33   198 auto const b1 = s.data(); 33   198 auto const b1 = s.data();
HITCBC 34   198 auto const e1 = b1 + s.size(); 34   198 auto const e1 = b1 + s.size();
35   auto const less_equal = 35   auto const less_equal =
36   std::less_equal<char const*>(); 36   std::less_equal<char const*>();
HITCBC 37   198 if(less_equal(e0, b1)) 37   198 if(less_equal(e0, b1))
HITCBC 38   4 return false; 38   4 return false;
HITCBC 39   194 if(less_equal(e1, b0)) 39   194 if(less_equal(e1, b0))
HITCBC 40   188 return false; 40   188 return false;
41   // partial overlap is undefined 41   // partial overlap is undefined
HITCBC 42   6 BOOST_ASSERT(less_equal(e1, e0)); 42   6 BOOST_ASSERT(less_equal(e1, e0));
HITCBC 43   6 BOOST_ASSERT(less_equal(b0, b1)); 43   6 BOOST_ASSERT(less_equal(b0, b1));
HITCBC 44   6 return true; 44   6 return true;
45   } 45   }
46   46  
47   inline 47   inline
48   void 48   void
HITCBC 49   110 move_chars_impl( 49   110 move_chars_impl(
50   char*, 50   char*,
51   char const*, 51   char const*,
52   core::string_view const&) noexcept 52   core::string_view const&) noexcept
53   { 53   {
HITCBC 54   110 } 54   110 }
55   55  
56   template<class... Sn> 56   template<class... Sn>
57   void 57   void
HITCBC 58   220 move_chars_impl( 58   220 move_chars_impl(
59   char* dest, 59   char* dest,
60   char const* src, 60   char const* src,
61   core::string_view const& buf, 61   core::string_view const& buf,
62   core::string_view* s, 62   core::string_view* s,
63   Sn&&... sn) noexcept 63   Sn&&... sn) noexcept
64   { 64   {
HITCBC 65   418 if( s != nullptr && 65   418 if( s != nullptr &&
HITCBC 66   198 is_overlapping(buf, *s)) 66   198 is_overlapping(buf, *s))
67   { 67   {
HITCBC 68   6 *s = { s->data() + (dest - src), s->size() }; 68   6 *s = { s->data() + (dest - src), s->size() };
69   } 69   }
HITCBC 70   220 move_chars_impl(dest, src, buf, sn...); 70   220 move_chars_impl(dest, src, buf, sn...);
HITCBC 71   220 } 71   220 }
72   72  
73   template<class... Args> 73   template<class... Args>
74   void 74   void
HITCBC 75   110 move_chars( 75   110 move_chars(
76   char* dest, 76   char* dest,
77   char const* src, 77   char const* src,
78   std::size_t n, 78   std::size_t n,
79   Args&&... args) noexcept 79   Args&&... args) noexcept
80   { 80   {
HITCBC 81   110 move_chars_impl( 81   110 move_chars_impl(
82   dest, 82   dest,
83   src, 83   src,
HITCBC 84   110 core::string_view(src, n), 84   110 core::string_view(src, n),
85   args...); 85   args...);
HITCBC 86   110 std::memmove( 86   110 std::memmove(
87   dest, src, n); 87   dest, src, n);
HITCBC 88   110 } 88   110 }
89   89  
90   } // detail 90   } // detail
91   } // http 91   } // http
92   } // boost 92   } // boost
93   93  
94   #endif 94   #endif