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1 | /* |
2 | * | |
3 | * Copyright (c) 2004 | |
4 | * John Maddock | |
5 | * | |
6 | * Use, modification and distribution are subject to the | |
7 | * Boost Software License, Version 1.0. (See accompanying file | |
8 | * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | * | |
10 | */ | |
11 | ||
12 | /* | |
13 | * LOCATION: see http://www.boost.org for most recent version. | |
14 | * FILE regex_raw_buffer.cpp | |
15 | * VERSION see <boost/version.hpp> | |
16 | * DESCRIPTION: Member functions for class raw_storage. | |
17 | */ | |
18 | ||
19 | ||
20 | #define BOOST_REGEX_SOURCE | |
21 | #include <boost/config.hpp> | |
22 | #include <memory> | |
23 | #include <cstring> | |
24 | #include <boost/assert.hpp> | |
25 | #include <boost/regex/v4/regex_raw_buffer.hpp> | |
26 | ||
27 | #if defined(BOOST_NO_STDC_NAMESPACE) | |
28 | namespace std{ | |
29 | using ::memcpy; | |
30 | using ::memmove; | |
31 | } | |
32 | #endif | |
33 | ||
34 | ||
35 | namespace boost{ namespace BOOST_REGEX_DETAIL_NS{ | |
36 | ||
37 | void BOOST_REGEX_CALL raw_storage::resize(size_type n) | |
38 | { | |
39 | size_type newsize = start ? last - start : 1024; | |
40 | while(newsize < n) | |
41 | newsize *= 2; | |
42 | size_type datasize = end - start; | |
43 | // extend newsize to WORD/DWORD boundary: | |
44 | newsize = (newsize + padding_mask) & ~(padding_mask); | |
45 | ||
46 | // allocate and copy data: | |
47 | pointer ptr = static_cast<pointer>(::operator new(newsize)); | |
48 | BOOST_REGEX_NOEH_ASSERT(ptr) | |
49 | if(start) | |
50 | std::memcpy(ptr, start, datasize); | |
51 | ||
52 | // get rid of old buffer: | |
53 | ::operator delete(start); | |
54 | ||
55 | // and set up pointers: | |
56 | start = ptr; | |
57 | end = ptr + datasize; | |
58 | last = ptr + newsize; | |
59 | } | |
60 | ||
61 | void* BOOST_REGEX_CALL raw_storage::insert(size_type pos, size_type n) | |
62 | { | |
63 | BOOST_ASSERT(pos <= size_type(end - start)); | |
64 | if(size_type(last - end) < n) | |
65 | resize(n + (end - start)); | |
66 | void* result = start + pos; | |
67 | std::memmove(start + pos + n, start + pos, (end - start) - pos); | |
68 | end += n; | |
69 | return result; | |
70 | } | |
71 | ||
72 | }} // namespaces |