annotate libinterp/corefcn/oct-fstrm.cc @ 29358:0a5b15007766 stable

update Octave Project Developers copyright for the new year In files that have the "Octave Project Developers" copyright notice, update for 2021.
author John W. Eaton <jwe@octave.org>
date Wed, 10 Feb 2021 09:52:15 -0500
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 1996-2021 The Octave Project Developers
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4 //
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5 // See the file COPYRIGHT.md in the top-level directory of this
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 #if defined (HAVE_CONFIG_H)
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27 # include "config.h"
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28 #endif
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29
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30 #include <cerrno>
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31 #include <cstring>
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32
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33 #include "error.h"
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34 #include "oct-fstrm.h"
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35
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36 octave::stream
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37 octave_fstream::create (const std::string& nm_arg, std::ios::openmode arg_md,
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38 octave::mach_info::float_format ff)
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39 {
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40 return octave::stream (new octave_fstream (nm_arg, arg_md, ff));
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41 }
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42
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43 octave_fstream::octave_fstream (const std::string& nm_arg,
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44 std::ios::openmode arg_md,
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45 octave::mach_info::float_format ff)
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46 : octave::base_stream (arg_md, ff), m_name (nm_arg)
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47 {
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48 m_fstream.open (m_name.c_str (), arg_md);
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49
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50 if (! m_fstream)
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51 // Note: error is inherited from octave::base_stream, not ::error.
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52 error (std::strerror (errno));
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53 }
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54
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55 // Position a stream at OFFSET relative to ORIGIN.
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56
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57 int
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58 octave_fstream::seek (off_t, int)
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59 {
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60 // Note: error is inherited from octave::base_stream, not ::error.
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61 // This error function does not halt execution so "return ..." must exist.
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62 error ("fseek: invalid_operation");
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63 return -1;
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64 }
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65
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66 // Return current stream position.
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67
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68 off_t
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69 octave_fstream::tell (void)
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70 {
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71 // Note: error is inherited from octave::base_stream, not ::error.
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72 // This error function does not halt execution so "return ..." must exist.
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73 error ("ftell: invalid_operation");
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74 return -1;
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75 }
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76
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77 // Return nonzero if EOF has been reached on this stream.
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78
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79 bool
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80 octave_fstream::eof (void) const
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81 {
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82 return m_fstream.eof ();
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83 }
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84
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85 void
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86 octave_fstream::do_close (void)
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87 {
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88 m_fstream.close ();
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89 }
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90
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91 std::istream *
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92 octave_fstream::input_stream (void)
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93 {
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94 std::istream *retval = nullptr;
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95
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96 if (mode () & std::ios::in)
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97 retval = &m_fstream;
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98
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99 return retval;
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100 }
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101
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102 std::ostream *
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103 octave_fstream::output_stream (void)
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104 {
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105 std::ostream *retval = nullptr;
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106
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107 if (mode () & std::ios::out)
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108 retval = &m_fstream;
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109
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110 return retval;
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111 }