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annotate libinterp/corefcn/c-file-ptr-stream.h @ 25444:37132909ac91

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Supply missing iostream declarations via <istream> (bug #54091) * c-file-ptr-stream.h: Replace both <iosfwd> and <streambuf> header files with the more inclusive <istream> header file.
author Daniel J Sebald <daniel.sebald@ieee.org>
date Sat, 09 Jun 2018 20:01:38 -0500
parents cb1606f78f6b
children 00f796120a6d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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3 Copyright (C) 2000-2018 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
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9 the Free Software Foundation, either version 3 of the License, or
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10 (at your option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but
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13 WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License 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, see
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19 <https://www.gnu.org/licenses/>.
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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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26 #include "octave-config.h"
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28 #include <cstdio>
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29 #include <istream>
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31 class
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32 c_file_ptr_buf : public std::streambuf
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33 {
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34 public:
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35
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36 typedef std::streambuf::int_type int_type;
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37
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38 typedef int (*close_fcn) (FILE *);
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39
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40 FILE *stdiofile (void) { return f; }
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41
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42 c_file_ptr_buf (FILE *f_arg, close_fcn cf_arg = file_close)
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43 : std::streambuf (), f (f_arg), cf (cf_arg)
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44 { }
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46 // No copying!
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47
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48 c_file_ptr_buf (const c_file_ptr_buf&) = delete;
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49
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50 c_file_ptr_buf& operator = (const c_file_ptr_buf&) = delete;
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51
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52 ~c_file_ptr_buf (void);
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53
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54 int_type overflow (int_type);
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55
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56 int_type underflow (void) { return underflow_common (false); }
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57
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58 int_type uflow (void) { return underflow_common (true); }
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59
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60 int_type pbackfail (int_type);
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61
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62 std::streamsize xsputn (const char*, std::streamsize);
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63
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64 std::streamsize xsgetn (char *, std::streamsize);
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65
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66 std::streampos seekoff (std::streamoff, std::ios::seekdir,
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67 std::ios::openmode = std::ios::in | std::ios::out);
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69 std::streampos seekpos (std::streampos,
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70 std::ios::openmode = std::ios::in | std::ios::out);
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72 int sync (void);
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74 int flush (void);
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75
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76 int buf_close (void);
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78 int file_number () const { return f ? fileno (f) : -1; }
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80 int seek (off_t offset, int origin);
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82 off_t tell (void);
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83
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84 void clear (void) { if (f) clearerr (f); }
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86 static int file_close (FILE *f);
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88 protected:
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90 FILE *f;
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92 close_fcn cf;
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94 private:
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95
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96 int_type underflow_common (bool);
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97 };
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98
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99 // FIXME: the following three classes could probably share some code...
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101 template <typename STREAM_T, typename FILE_T, typename BUF_T>
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102 class
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103 c_file_ptr_stream : public STREAM_T
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104 {
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105 public:
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106
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107 c_file_ptr_stream (FILE_T f, typename BUF_T::close_fcn cf = BUF_T::file_close)
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108 : STREAM_T (nullptr), buf (new BUF_T (f, cf)) { STREAM_T::init (buf); }
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110 // No copying!
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111
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112 c_file_ptr_stream (const c_file_ptr_stream&) = delete;
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113
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114 c_file_ptr_stream& operator = (const c_file_ptr_stream&) = delete;
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115
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116 ~c_file_ptr_stream (void) { delete buf; buf = nullptr; }
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118 BUF_T * rdbuf (void) { return buf; }
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119
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120 void stream_close (void) { if (buf) buf->buf_close (); }
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122 int seek (off_t offset, int origin)
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123 { return buf ? buf->seek (offset, origin) : -1; }
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124
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125 off_t tell (void) { return buf ? buf->tell () : -1; }
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126
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127 void clear (void) { if (buf) buf->clear (); STREAM_T::clear (); }
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128
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129 private:
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130
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131 BUF_T *buf;
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132 };
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133
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134 typedef c_file_ptr_stream<std::istream, FILE *, c_file_ptr_buf>
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135 i_c_file_ptr_stream;
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136 typedef c_file_ptr_stream<std::ostream, FILE *, c_file_ptr_buf>
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137 o_c_file_ptr_stream;
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138 typedef c_file_ptr_stream<std::iostream, FILE *, c_file_ptr_buf>
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139 io_c_file_ptr_stream;
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140
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141 #if defined (HAVE_ZLIB)
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143 #if defined (HAVE_ZLIB_H)
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144 # include <zlib.h>
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145 #endif
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146
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147 class
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148 c_zfile_ptr_buf : public std::streambuf
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149 {
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150 public:
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151
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152 typedef std::streambuf::int_type int_type;
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153
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154 typedef int (*close_fcn) (gzFile);
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155
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156 gzFile stdiofile (void) { return f; }
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157
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158 c_zfile_ptr_buf (gzFile f_arg, close_fcn cf_arg = file_close)
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159 : std::streambuf (), f (f_arg), cf (cf_arg)
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160 { }
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161
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162 // No copying!
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163
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164 c_zfile_ptr_buf (const c_zfile_ptr_buf&) = delete;
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165
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166 c_zfile_ptr_buf& operator = (const c_zfile_ptr_buf&) = delete;
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167
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168 ~c_zfile_ptr_buf (void);
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169
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170 int_type overflow (int_type);
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171
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172 int_type underflow (void) { return underflow_common (false); }
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173
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174 int_type uflow (void) { return underflow_common (true); }
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175
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176 int_type pbackfail (int_type);
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177
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178 std::streamsize xsputn (const char*, std::streamsize);
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179
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180 std::streamsize xsgetn (char *, std::streamsize);
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181
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182 std::streampos seekoff (std::streamoff, std::ios::seekdir,
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183 std::ios::openmode = std::ios::in | std::ios::out);
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184
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185 std::streampos seekpos (std::streampos,
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186 std::ios::openmode = std::ios::in | std::ios::out);
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187
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188 int sync (void);
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189
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190 int flush (void);
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191
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192 int buf_close (void);
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193
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194 int file_number () const { return -1; }
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195
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196 int seek (off_t offset, int origin)
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197 { return f ? gzseek (f, offset, origin) >= 0 : -1; }
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198
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199 off_t tell (void) { return f ? gztell (f) : -1; }
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200
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201 void clear (void) { if (f) gzclearerr (f); }
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202
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203 static int file_close (gzFile f) { return ::gzclose (f); }
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204
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205 protected:
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206
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207 gzFile f;
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208
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209 close_fcn cf;
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210
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211 private:
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212
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213 int_type underflow_common (bool);
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214 };
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215
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216 typedef c_file_ptr_stream<std::istream, gzFile, c_zfile_ptr_buf>
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217 i_c_zfile_ptr_stream;
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218 typedef c_file_ptr_stream<std::ostream, gzFile, c_zfile_ptr_buf>
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219 o_c_zfile_ptr_stream;
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220 typedef c_file_ptr_stream<std::iostream, gzFile, c_zfile_ptr_buf>
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221 io_c_zfile_ptr_stream;
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222
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223 #endif
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224
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225 #endif