Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 1 | // -*- C++ -*- |
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
Howard Hinnant | f5256e1 | 2010-05-11 21:36:01 +0000 | [diff] [blame] | 4 | // The LLVM Compiler Infrastructure |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 5 | // |
Howard Hinnant | b64f8b0 | 2010-11-16 22:09:02 +0000 | [diff] [blame] | 6 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 7 | // Source Licenses. See LICENSE.TXT for details. |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 8 | // |
| 9 | //===----------------------------------------------------------------------===// |
| 10 | |
| 11 | #ifndef _LIBCPP___STD_STREAM |
| 12 | #define _LIBCPP___STD_STREAM |
| 13 | |
| 14 | #include <__config> |
| 15 | #include <ostream> |
| 16 | #include <istream> |
| 17 | #include <__locale> |
| 18 | #include <cstdio> |
| 19 | |
Howard Hinnant | 08e1747 | 2011-10-17 20:05:10 +0000 | [diff] [blame^] | 20 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 21 | #pragma GCC system_header |
Howard Hinnant | 08e1747 | 2011-10-17 20:05:10 +0000 | [diff] [blame^] | 22 | #endif |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 23 | |
| 24 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 25 | |
| 26 | static const unsigned __limit = 8; |
| 27 | |
| 28 | // __stdinbuf |
| 29 | |
| 30 | template <class _CharT> |
| 31 | class _LIBCPP_HIDDEN __stdinbuf |
| 32 | : public basic_streambuf<_CharT, char_traits<_CharT> > |
| 33 | { |
| 34 | public: |
| 35 | typedef _CharT char_type; |
| 36 | typedef char_traits<char_type> traits_type; |
| 37 | typedef typename traits_type::int_type int_type; |
| 38 | typedef typename traits_type::pos_type pos_type; |
| 39 | typedef typename traits_type::off_type off_type; |
| 40 | typedef typename traits_type::state_type state_type; |
| 41 | |
| 42 | explicit __stdinbuf(FILE* __fp); |
| 43 | |
| 44 | protected: |
| 45 | virtual int_type underflow(); |
| 46 | virtual int_type uflow(); |
| 47 | virtual int_type pbackfail(int_type __c = traits_type::eof()); |
| 48 | virtual void imbue(const locale& __loc); |
| 49 | |
| 50 | private: |
| 51 | |
| 52 | FILE* __file_; |
| 53 | const codecvt<char_type, char, state_type>* __cv_; |
| 54 | state_type __st_; |
| 55 | int __encoding_; |
| 56 | bool __always_noconv_; |
| 57 | |
| 58 | __stdinbuf(const __stdinbuf&); |
| 59 | __stdinbuf& operator=(const __stdinbuf&); |
| 60 | |
| 61 | int_type __getchar(bool __consume); |
| 62 | }; |
| 63 | |
| 64 | template <class _CharT> |
| 65 | __stdinbuf<_CharT>::__stdinbuf(FILE* __fp) |
| 66 | : __file_(__fp), |
| 67 | __st_() |
| 68 | { |
| 69 | imbue(this->getloc()); |
| 70 | } |
| 71 | |
| 72 | template <class _CharT> |
| 73 | void |
| 74 | __stdinbuf<_CharT>::imbue(const locale& __loc) |
| 75 | { |
| 76 | __cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc); |
| 77 | __encoding_ = __cv_->encoding(); |
| 78 | __always_noconv_ = __cv_->always_noconv(); |
| 79 | if (__encoding_ > __limit) |
| 80 | __throw_runtime_error("unsupported locale for standard input"); |
| 81 | } |
| 82 | |
| 83 | template <class _CharT> |
| 84 | typename __stdinbuf<_CharT>::int_type |
| 85 | __stdinbuf<_CharT>::underflow() |
| 86 | { |
| 87 | return __getchar(false); |
| 88 | } |
| 89 | |
| 90 | template <class _CharT> |
| 91 | typename __stdinbuf<_CharT>::int_type |
| 92 | __stdinbuf<_CharT>::uflow() |
| 93 | { |
| 94 | return __getchar(true); |
| 95 | } |
| 96 | |
| 97 | template <class _CharT> |
| 98 | typename __stdinbuf<_CharT>::int_type |
| 99 | __stdinbuf<_CharT>::__getchar(bool __consume) |
| 100 | { |
| 101 | char __extbuf[__limit]; |
Howard Hinnant | 0949eed | 2011-06-30 21:18:19 +0000 | [diff] [blame] | 102 | int __nread = _VSTD::max(1, __encoding_); |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 103 | for (int __i = 0; __i < __nread; ++__i) |
| 104 | { |
| 105 | char __c = getc(__file_); |
| 106 | if (__c == EOF) |
| 107 | return traits_type::eof(); |
| 108 | __extbuf[__i] = static_cast<char>(__c); |
| 109 | } |
| 110 | char_type __1buf; |
| 111 | if (__always_noconv_) |
| 112 | __1buf = static_cast<char_type>(__extbuf[0]); |
| 113 | else |
| 114 | { |
| 115 | const char* __enxt; |
| 116 | char_type* __inxt; |
| 117 | codecvt_base::result __r; |
| 118 | do |
| 119 | { |
| 120 | state_type __sv_st = __st_; |
| 121 | __r = __cv_->in(__st_, __extbuf, __extbuf + __nread, __enxt, |
| 122 | &__1buf, &__1buf + 1, __inxt); |
| 123 | switch (__r) |
| 124 | { |
Howard Hinnant | 0949eed | 2011-06-30 21:18:19 +0000 | [diff] [blame] | 125 | case _VSTD::codecvt_base::ok: |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 126 | break; |
| 127 | case codecvt_base::partial: |
| 128 | __st_ = __sv_st; |
| 129 | if (__nread == sizeof(__extbuf)) |
| 130 | return traits_type::eof(); |
| 131 | { |
| 132 | char __c = getc(__file_); |
| 133 | if (__c == EOF) |
| 134 | return traits_type::eof(); |
| 135 | __extbuf[__nread] = static_cast<char>(__c); |
| 136 | } |
| 137 | ++__nread; |
| 138 | break; |
| 139 | case codecvt_base::error: |
| 140 | return traits_type::eof(); |
Howard Hinnant | 0949eed | 2011-06-30 21:18:19 +0000 | [diff] [blame] | 141 | case _VSTD::codecvt_base::noconv: |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 142 | __1buf = static_cast<char_type>(__extbuf[0]); |
| 143 | break; |
| 144 | } |
Howard Hinnant | 0949eed | 2011-06-30 21:18:19 +0000 | [diff] [blame] | 145 | } while (__r == _VSTD::codecvt_base::partial); |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 146 | } |
| 147 | if (!__consume) |
| 148 | { |
| 149 | for (int __i = __nread; __i > 0;) |
| 150 | { |
| 151 | if (ungetc(__extbuf[--__i], __file_) == EOF) |
| 152 | return traits_type::eof(); |
| 153 | } |
| 154 | } |
| 155 | return traits_type::to_int_type(__1buf); |
| 156 | } |
| 157 | |
| 158 | template <class _CharT> |
| 159 | typename __stdinbuf<_CharT>::int_type |
| 160 | __stdinbuf<_CharT>::pbackfail(int_type __c) |
| 161 | { |
| 162 | if (traits_type::eq_int_type(__c, traits_type::eof())) |
| 163 | return __c; |
| 164 | char __extbuf[__limit]; |
| 165 | char* __enxt; |
| 166 | const char_type __ci = traits_type::to_char_type(__c); |
| 167 | const char_type* __inxt; |
| 168 | switch (__cv_->out(__st_, &__ci, &__ci + 1, __inxt, |
| 169 | __extbuf, __extbuf + sizeof(__extbuf), __enxt)) |
| 170 | { |
Howard Hinnant | 0949eed | 2011-06-30 21:18:19 +0000 | [diff] [blame] | 171 | case _VSTD::codecvt_base::ok: |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 172 | break; |
Howard Hinnant | 0949eed | 2011-06-30 21:18:19 +0000 | [diff] [blame] | 173 | case _VSTD::codecvt_base::noconv: |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 174 | __extbuf[0] = static_cast<char>(__c); |
| 175 | __enxt = __extbuf + 1; |
| 176 | break; |
| 177 | case codecvt_base::partial: |
| 178 | case codecvt_base::error: |
| 179 | return traits_type::eof(); |
| 180 | } |
| 181 | while (__enxt > __extbuf) |
| 182 | if (ungetc(*--__enxt, __file_) == EOF) |
| 183 | return traits_type::eof(); |
Howard Hinnant | f5256e1 | 2010-05-11 21:36:01 +0000 | [diff] [blame] | 184 | return traits_type::not_eof(__c); |
Howard Hinnant | bc8d3f9 | 2010-05-11 19:42:16 +0000 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | // __stdoutbuf |
| 188 | |
| 189 | template <class _CharT> |
| 190 | class _LIBCPP_HIDDEN __stdoutbuf |
| 191 | : public basic_streambuf<_CharT, char_traits<_CharT> > |
| 192 | { |
| 193 | public: |
| 194 | typedef _CharT char_type; |
| 195 | typedef char_traits<char_type> traits_type; |
| 196 | typedef typename traits_type::int_type int_type; |
| 197 | typedef typename traits_type::pos_type pos_type; |
| 198 | typedef typename traits_type::off_type off_type; |
| 199 | typedef typename traits_type::state_type state_type; |
| 200 | |
| 201 | explicit __stdoutbuf(FILE* __fp); |
| 202 | |
| 203 | protected: |
| 204 | virtual int_type overflow (int_type __c = traits_type::eof()); |
| 205 | virtual int sync(); |
| 206 | virtual void imbue(const locale& __loc); |
| 207 | |
| 208 | private: |
| 209 | FILE* __file_; |
| 210 | const codecvt<char_type, char, state_type>* __cv_; |
| 211 | state_type __st_; |
| 212 | bool __always_noconv_; |
| 213 | |
| 214 | __stdoutbuf(const __stdoutbuf&); |
| 215 | __stdoutbuf& operator=(const __stdoutbuf&); |
| 216 | }; |
| 217 | |
| 218 | template <class _CharT> |
| 219 | __stdoutbuf<_CharT>::__stdoutbuf(FILE* __fp) |
| 220 | : __file_(__fp), |
| 221 | __cv_(&use_facet<codecvt<char_type, char, state_type> >(this->getloc())), |
| 222 | __st_(), |
| 223 | __always_noconv_(__cv_->always_noconv()) |
| 224 | { |
| 225 | } |
| 226 | |
| 227 | template <class _CharT> |
| 228 | typename __stdoutbuf<_CharT>::int_type |
| 229 | __stdoutbuf<_CharT>::overflow(int_type __c) |
| 230 | { |
| 231 | char __extbuf[__limit]; |
| 232 | char_type __1buf; |
| 233 | if (!traits_type::eq_int_type(__c, traits_type::eof())) |
| 234 | { |
| 235 | this->setp(&__1buf, &__1buf+1); |
| 236 | *this->pptr() = traits_type::to_char_type(__c); |
| 237 | this->pbump(1); |
| 238 | if (__always_noconv_) |
| 239 | { |
| 240 | if (fwrite(this->pbase(), sizeof(char_type), 1, __file_) != 1) |
| 241 | return traits_type::eof(); |
| 242 | } |
| 243 | else |
| 244 | { |
| 245 | char* __extbe = __extbuf; |
| 246 | codecvt_base::result __r; |
| 247 | do |
| 248 | { |
| 249 | const char_type* __e; |
| 250 | __r = __cv_->out(__st_, this->pbase(), this->pptr(), __e, |
| 251 | __extbuf, |
| 252 | __extbuf + sizeof(__extbuf), |
| 253 | __extbe); |
| 254 | if (__e == this->pbase()) |
| 255 | return traits_type::eof(); |
| 256 | if (__r == codecvt_base::noconv) |
| 257 | { |
| 258 | if (fwrite(this->pbase(), 1, 1, __file_) != 1) |
| 259 | return traits_type::eof(); |
| 260 | } |
| 261 | else if (__r == codecvt_base::ok || __r == codecvt_base::partial) |
| 262 | { |
| 263 | size_t __nmemb = static_cast<size_t>(__extbe - __extbuf); |
| 264 | if (fwrite(__extbuf, 1, __nmemb, __file_) != __nmemb) |
| 265 | return traits_type::eof(); |
| 266 | if (__r == codecvt_base::partial) |
| 267 | { |
| 268 | this->setp((char_type*)__e, this->pptr()); |
| 269 | this->pbump(this->epptr() - this->pbase()); |
| 270 | } |
| 271 | } |
| 272 | else |
| 273 | return traits_type::eof(); |
| 274 | } while (__r == codecvt_base::partial); |
| 275 | } |
| 276 | this->setp(0, 0); |
| 277 | } |
| 278 | return traits_type::not_eof(__c); |
| 279 | } |
| 280 | |
| 281 | template <class _CharT> |
| 282 | int |
| 283 | __stdoutbuf<_CharT>::sync() |
| 284 | { |
| 285 | char __extbuf[__limit]; |
| 286 | codecvt_base::result __r; |
| 287 | do |
| 288 | { |
| 289 | char* __extbe; |
| 290 | __r = __cv_->unshift(__st_, __extbuf, |
| 291 | __extbuf + sizeof(__extbuf), |
| 292 | __extbe); |
| 293 | size_t __nmemb = static_cast<size_t>(__extbe - __extbuf); |
| 294 | if (fwrite(__extbuf, 1, __nmemb, __file_) != __nmemb) |
| 295 | return -1; |
| 296 | } while (__r == codecvt_base::partial); |
| 297 | if (__r == codecvt_base::error) |
| 298 | return -1; |
| 299 | if (fflush(__file_)) |
| 300 | return -1; |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | template <class _CharT> |
| 305 | void |
| 306 | __stdoutbuf<_CharT>::imbue(const locale& __loc) |
| 307 | { |
| 308 | sync(); |
| 309 | __cv_ = &use_facet<codecvt<char_type, char, state_type> >(__loc); |
| 310 | __always_noconv_ = __cv_->always_noconv(); |
| 311 | } |
| 312 | |
| 313 | _LIBCPP_END_NAMESPACE_STD |
| 314 | |
| 315 | #endif // _LIBCPP___STD_STREAM |