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1 /* |
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2 |
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3 Copyright (C) 2000 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #if !defined (octave_c_file_ptr_stream_h) |
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24 #define octave_c_file_ptr_stream_h 1 |
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25 |
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26 #ifdef __GNUG__ |
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27 #pragma interface |
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28 #endif |
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29 |
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30 #include <iostream> |
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31 #include <fstream> |
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32 #include <cstdio> |
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33 |
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34 // |
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35 // The c_file_ptr_buf requires a std::filebuf that accepts an open |
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36 // file descriptor. This feature, while not part of the ISO C++ |
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37 // standard, is supported by a variety of C++ compiler runtimes, |
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38 // albeit in slightly different ways. |
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39 // |
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40 // The C++ runtime libraries shipped with GCC versions < 3.0, Sun Pro, |
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41 // Sun Workshop/Forte 5/6, Compaq C++ all support a non-standard filebuf |
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42 // constructor that takes an open file descriptor. The almost ISO compliant |
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43 // GNU C++ runtime shipped with GCC 3.0.x supports a different non-standard |
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44 // filebuf constructor that takes a FILE* instead; starting from GCC 3.1, |
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45 // the GNU C++ runtime removes all non-standard std::filebuf constructors |
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46 // and provides an extension template class __gnu_cxx::stdio_filebuf |
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47 // that supports the the 3.0.x behavior. |
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48 // |
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49 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1) |
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50 # include <ext/stdio_filebuf.h> |
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51 # define OCTAVE_STD_FILEBUF __gnu_cxx::stdio_filebuf<char> |
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52 #else |
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53 # define OCTAVE_STD_FILEBUF std::filebuf |
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54 #endif |
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55 |
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56 class |
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57 c_file_ptr_buf : public OCTAVE_STD_FILEBUF |
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58 { |
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59 public: |
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60 |
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61 #if !defined (CXX_ISO_COMPLIANT_LIBRARY) |
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62 typedef int int_type; |
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63 #else |
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64 typedef std::filebuf::int_type int_type; |
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65 #endif |
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66 |
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67 typedef int (*close_fcn) (FILE *); |
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68 |
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69 FILE* stdiofile (void) const { return f; } |
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70 |
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71 c_file_ptr_buf (FILE *f_arg, close_fcn cf_arg = fclose) |
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72 : |
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73 #if defined __GNUC__ && __GNUC__ >= 3 |
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74 OCTAVE_STD_FILEBUF (f_arg, std::ios::in | std::ios::out), |
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75 #else |
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76 OCTAVE_STD_FILEBUF (f_arg ? fileno (f_arg) : -1), |
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77 #endif |
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78 f (f_arg), cf (cf_arg), |
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79 fd (f_arg ? fileno (f_arg) : -1) |
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80 { } |
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81 |
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82 ~c_file_ptr_buf (void); |
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83 |
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84 int_type overflow (int_type); |
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85 |
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86 int_type underflow (void); |
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87 |
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88 int_type uflow (void); |
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89 |
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90 int_type pbackfail (int_type); |
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91 |
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92 std::streamsize xsputn (const char*, std::streamsize); |
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93 |
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94 std::streamsize xsgetn (char *, std::streamsize); |
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95 |
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96 std::streampos seekoff (std::streamoff, std::ios::seekdir, |
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97 std::ios::openmode = std::ios::in | std::ios::out); |
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98 |
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99 std::streampos seekpos (std::streampos, |
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100 std::ios::openmode = std::ios::in | std::ios::out); |
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101 |
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102 int sync (void); |
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103 |
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104 int flush (void); |
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105 |
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106 int close (void); |
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107 |
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108 int file_number () const { return fd; } |
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109 |
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110 static int fclose (FILE *f) { return ::fclose (f); } |
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111 |
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112 protected: |
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113 |
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114 FILE *f; |
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115 |
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116 close_fcn cf; |
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117 |
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118 private: |
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119 |
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120 int fd; |
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121 }; |
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122 |
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123 #undef OCTAVE_STD_FILEBUF |
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124 |
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125 class |
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126 i_c_file_ptr_stream : public std::istream |
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127 { |
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128 public: |
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129 |
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130 i_c_file_ptr_stream (FILE* f, |
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131 c_file_ptr_buf::close_fcn cf = c_file_ptr_buf::fclose) |
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132 : std::istream (0), buf (new c_file_ptr_buf (f, cf)) { init (buf); } |
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133 |
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134 ~i_c_file_ptr_stream (void) { delete buf; buf = 0; } |
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135 |
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136 c_file_ptr_buf *rdbuf (void) { return buf; } |
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137 |
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138 void close (void); |
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139 |
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140 private: |
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141 |
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142 c_file_ptr_buf *buf; |
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143 }; |
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144 |
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145 class |
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146 o_c_file_ptr_stream : public std::ostream |
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147 { |
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148 public: |
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149 |
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150 o_c_file_ptr_stream (FILE* f, |
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151 c_file_ptr_buf::close_fcn cf = c_file_ptr_buf::fclose) |
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152 : std::ostream (0), buf (new c_file_ptr_buf (f, cf)) { init (buf); } |
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153 |
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154 ~o_c_file_ptr_stream (void) { delete buf; buf = 0; } |
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155 |
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156 c_file_ptr_buf *rdbuf (void) { return buf; } |
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157 |
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158 void close (void); |
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159 |
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160 private: |
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161 |
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162 c_file_ptr_buf *buf; |
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163 }; |
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164 |
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165 #endif |
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166 |
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167 /* |
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168 ;;; Local Variables: *** |
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169 ;;; mode: C++ *** |
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170 ;;; End: *** |
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171 */ |
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172 |
