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00034 #ifndef _STDIO_SYNC_FILEBUF_H
00035 #define _STDIO_SYNC_FILEBUF_H 1
00036
00037 #pragma GCC system_header
00038
00039 #include <streambuf>
00040 #include <unistd.h>
00041 #include <cstdio>
00042
00043 #ifdef _GLIBCXX_USE_WCHAR_T
00044 #include <cwchar>
00045 #endif
00046
00047 namespace __gnu_cxx
00048 {
00049 template<typename _CharT, typename _Traits = std::char_traits<_CharT> >
00050 class stdio_sync_filebuf : public std::basic_streambuf<_CharT, _Traits>
00051 {
00052 public:
00053
00054 typedef _CharT char_type;
00055 typedef _Traits traits_type;
00056 typedef typename traits_type::int_type int_type;
00057 typedef typename traits_type::pos_type pos_type;
00058 typedef typename traits_type::off_type off_type;
00059
00060 private:
00061
00062 std::__c_file* const _M_file;
00063
00064
00065
00066 int_type _M_unget_buf;
00067
00068 public:
00069 explicit
00070 stdio_sync_filebuf(std::__c_file* __f)
00071 : _M_file(__f), _M_unget_buf(traits_type::eof())
00072 { }
00073
00081 std::__c_file* const
00082 file() { return this->_M_file; }
00083
00084 protected:
00085 int_type
00086 syncgetc();
00087
00088 int_type
00089 syncungetc(int_type __c);
00090
00091 int_type
00092 syncputc(int_type __c);
00093
00094 virtual int_type
00095 underflow()
00096 {
00097 int_type __c = this->syncgetc();
00098 return this->syncungetc(__c);
00099 }
00100
00101 virtual int_type
00102 uflow()
00103 {
00104
00105 _M_unget_buf = this->syncgetc();
00106 return _M_unget_buf;
00107 }
00108
00109 virtual int_type
00110 pbackfail(int_type __c = traits_type::eof())
00111 {
00112 int_type __ret;
00113 const int_type __eof = traits_type::eof();
00114
00115
00116 if (traits_type::eq_int_type(__c, __eof))
00117 {
00118 if (!traits_type::eq_int_type(_M_unget_buf, __eof))
00119 __ret = this->syncungetc(_M_unget_buf);
00120 else
00121 __ret = __eof;
00122 }
00123 else
00124 __ret = this->syncungetc(__c);
00125
00126
00127 _M_unget_buf = __eof;
00128 return __ret;
00129 }
00130
00131 virtual std::streamsize
00132 xsgetn(char_type* __s, std::streamsize __n);
00133
00134 virtual int_type
00135 overflow(int_type __c = traits_type::eof())
00136 {
00137 int_type __ret;
00138 if (traits_type::eq_int_type(__c, traits_type::eof()))
00139 {
00140 if (std::fflush(_M_file))
00141 __ret = traits_type::eof();
00142 else
00143 __ret = traits_type::not_eof(__c);
00144 }
00145 else
00146 __ret = this->syncputc(__c);
00147 return __ret;
00148 }
00149
00150 virtual std::streamsize
00151 xsputn(const char_type* __s, std::streamsize __n);
00152
00153 virtual int
00154 sync()
00155 { return std::fflush(_M_file); }
00156
00157 virtual std::streampos
00158 seekoff(std::streamoff __off, std::ios_base::seekdir __dir,
00159 std::ios_base::openmode = std::ios_base::in | std::ios_base::out)
00160 {
00161 std::streampos __ret(std::streamoff(-1));
00162 int __whence;
00163 if (__dir == std::ios_base::beg)
00164 __whence = SEEK_SET;
00165 else if (__dir == std::ios_base::cur)
00166 __whence = SEEK_CUR;
00167 else
00168 __whence = SEEK_END;
00169 #ifdef _GLIBCXX_USE_LFS
00170 if (!fseeko64(_M_file, __off, __whence))
00171 __ret = std::streampos(ftello64(_M_file));
00172 #else
00173 if (!fseek(_M_file, __off, __whence))
00174 __ret = std::streampos(std::ftell(_M_file));
00175 #endif
00176 return __ret;
00177 }
00178
00179 virtual std::streampos
00180 seekpos(std::streampos __pos,
00181 std::ios_base::openmode __mode =
00182 std::ios_base::in | std::ios_base::out)
00183 { return seekoff(std::streamoff(__pos), std::ios_base::beg, __mode); }
00184 };
00185
00186 template<>
00187 inline stdio_sync_filebuf<char>::int_type
00188 stdio_sync_filebuf<char>::syncgetc()
00189 { return std::getc(_M_file); }
00190
00191 template<>
00192 inline stdio_sync_filebuf<char>::int_type
00193 stdio_sync_filebuf<char>::syncungetc(int_type __c)
00194 { return std::ungetc(__c, _M_file); }
00195
00196 template<>
00197 inline stdio_sync_filebuf<char>::int_type
00198 stdio_sync_filebuf<char>::syncputc(int_type __c)
00199 { return std::putc(__c, _M_file); }
00200
00201 template<>
00202 inline std::streamsize
00203 stdio_sync_filebuf<char>::xsgetn(char* __s, std::streamsize __n)
00204 {
00205 std::streamsize __ret = std::fread(__s, 1, __n, _M_file);
00206 if (__ret > 0)
00207 _M_unget_buf = traits_type::to_int_type(__s[__ret - 1]);
00208 else
00209 _M_unget_buf = traits_type::eof();
00210 return __ret;
00211 }
00212
00213 template<>
00214 inline std::streamsize
00215 stdio_sync_filebuf<char>::xsputn(const char* __s, std::streamsize __n)
00216 { return std::fwrite(__s, 1, __n, _M_file); }
00217
00218 #ifdef _GLIBCXX_USE_WCHAR_T
00219 template<>
00220 inline stdio_sync_filebuf<wchar_t>::int_type
00221 stdio_sync_filebuf<wchar_t>::syncgetc()
00222 { return std::getwc(_M_file); }
00223
00224 template<>
00225 inline stdio_sync_filebuf<wchar_t>::int_type
00226 stdio_sync_filebuf<wchar_t>::syncungetc(int_type __c)
00227 { return std::ungetwc(__c, _M_file); }
00228
00229 template<>
00230 inline stdio_sync_filebuf<wchar_t>::int_type
00231 stdio_sync_filebuf<wchar_t>::syncputc(int_type __c)
00232 { return std::putwc(__c, _M_file); }
00233
00234 template<>
00235 inline std::streamsize
00236 stdio_sync_filebuf<wchar_t>::xsgetn(wchar_t* __s, std::streamsize __n)
00237 {
00238 std::streamsize __ret = 0;
00239 const int_type __eof = traits_type::eof();
00240 while (__n--)
00241 {
00242 int_type __c = this->syncgetc();
00243 if (traits_type::eq_int_type(__c, __eof))
00244 break;
00245 __s[__ret] = traits_type::to_char_type(__c);
00246 ++__ret;
00247 }
00248
00249 if (__ret > 0)
00250 _M_unget_buf = traits_type::to_int_type(__s[__ret - 1]);
00251 else
00252 _M_unget_buf = traits_type::eof();
00253 return __ret;
00254 }
00255
00256 template<>
00257 inline std::streamsize
00258 stdio_sync_filebuf<wchar_t>::xsputn(const wchar_t* __s,
00259 std::streamsize __n)
00260 {
00261 std::streamsize __ret = 0;
00262 const int_type __eof = traits_type::eof();
00263 while (__n--)
00264 {
00265 if (traits_type::eq_int_type(this->syncputc(*__s++), __eof))
00266 break;
00267 ++__ret;
00268 }
00269 return __ret;
00270 }
00271 #endif
00272
00273 #if _GLIBCXX_EXTERN_TEMPLATE
00274 extern template class stdio_sync_filebuf<char>;
00275 #ifdef _GLIBCXX_USE_WCHAR_T
00276 extern template class stdio_sync_filebuf<wchar_t>;
00277 #endif
00278 #endif
00279 }
00280
00281 #endif