| 79 | | class parser_buf : public ::std::basic_streambuf<charT, traits> |
| 80 | | { |
| 81 | | typedef ::std::basic_streambuf<charT, traits> base_type; |
| 82 | | typedef typename base_type::int_type int_type; |
| 83 | | typedef typename base_type::char_type char_type; |
| 84 | | typedef typename base_type::pos_type pos_type; |
| 85 | | typedef ::std::streamsize streamsize; |
| 86 | | typedef typename base_type::off_type off_type; |
| 87 | | public: |
| 88 | | parser_buf() : base_type() { setbuf(0, 0); } |
| 89 | | const charT* getnext() { return this->gptr(); } |
| 90 | | protected: |
| 91 | | std::basic_streambuf<charT, traits>* setbuf(char_type* s, streamsize n); |
| 92 | | typename parser_buf<charT, traits>::pos_type seekpos(pos_type sp, ::std::ios_base::openmode which); |
| 93 | | typename parser_buf<charT, traits>::pos_type seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which); |
| 94 | | private: |
| 95 | | parser_buf& operator=(const parser_buf&); |
| 96 | | parser_buf(const parser_buf&); |
| 97 | | }; |
| | 80 | class parser_buf |
| | 81 | : public boost::detail::basic_pointerbuf<charT, std::basic_streambuf<charT, traits> > |
| | 82 | {}; |
| 99 | | template<class charT, class traits> |
| 100 | | std::basic_streambuf<charT, traits>* |
| 101 | | parser_buf<charT, traits>::setbuf(char_type* s, streamsize n) |
| 102 | | { |
| 103 | | this->setg(s, s, s + n); |
| 104 | | return this; |
| 105 | | } |
| 106 | | |
| 107 | | template<class charT, class traits> |
| 108 | | typename parser_buf<charT, traits>::pos_type |
| 109 | | parser_buf<charT, traits>::seekoff(off_type off, ::std::ios_base::seekdir way, ::std::ios_base::openmode which) |
| 110 | | { |
| 111 | | typedef typename boost::int_t<sizeof(way) * CHAR_BIT>::least cast_type; |
| 112 | | |
| 113 | | if(which & ::std::ios_base::out) |
| 114 | | return pos_type(off_type(-1)); |
| 115 | | std::ptrdiff_t size = this->egptr() - this->eback(); |
| 116 | | std::ptrdiff_t pos = this->gptr() - this->eback(); |
| 117 | | charT* g = this->eback(); |
| 118 | | switch(static_cast<cast_type>(way)) |
| 119 | | { |
| 120 | | case ::std::ios_base::beg: |
| 121 | | if((off < 0) || (off > size)) |
| 122 | | return pos_type(off_type(-1)); |
| 123 | | else |
| 124 | | this->setg(g, g + off, g + size); |
| 125 | | break; |
| 126 | | case ::std::ios_base::end: |
| 127 | | if((off < 0) || (off > size)) |
| 128 | | return pos_type(off_type(-1)); |
| 129 | | else |
| 130 | | this->setg(g, g + size - off, g + size); |
| 131 | | break; |
| 132 | | case ::std::ios_base::cur: |
| 133 | | { |
| 134 | | std::ptrdiff_t newpos = static_cast<std::ptrdiff_t>(pos + off); |
| 135 | | if((newpos < 0) || (newpos > size)) |
| 136 | | return pos_type(off_type(-1)); |
| 137 | | else |
| 138 | | this->setg(g, g + newpos, g + size); |
| 139 | | break; |
| 140 | | } |
| 141 | | default: ; |
| 142 | | } |
| 143 | | #ifdef BOOST_MSVC |
| 144 | | #pragma warning(push) |
| 145 | | #pragma warning(disable:4244) |
| 146 | | #endif |
| 147 | | return static_cast<pos_type>(this->gptr() - this->eback()); |
| 148 | | #ifdef BOOST_MSVC |
| 149 | | #pragma warning(pop) |
| 150 | | #endif |
| 151 | | } |
| 152 | | |
| 153 | | template<class charT, class traits> |
| 154 | | typename parser_buf<charT, traits>::pos_type |
| 155 | | parser_buf<charT, traits>::seekpos(pos_type sp, ::std::ios_base::openmode which) |
| 156 | | { |
| 157 | | if(which & ::std::ios_base::out) |
| 158 | | return pos_type(off_type(-1)); |
| 159 | | off_type size = static_cast<off_type>(this->egptr() - this->eback()); |
| 160 | | charT* g = this->eback(); |
| 161 | | if(off_type(sp) <= size) |
| 162 | | { |
| 163 | | this->setg(g, g + off_type(sp), g + size); |
| 164 | | } |
| 165 | | return pos_type(off_type(-1)); |
| 166 | | } |
| 167 | | |
