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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include <cerrno> |
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28 #include <cstring> |
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29 |
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30 #include "error.h" |
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31 #include "oct-fstrm.h" |
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32 |
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33 octave_stream |
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34 octave_fstream::create (const std::string& nm_arg, ios::openmode md, |
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35 oct_mach_info::float_format flt_fmt) |
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36 { |
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37 return octave_stream (new octave_fstream (nm_arg, md, flt_fmt)); |
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38 } |
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39 |
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40 octave_fstream::octave_fstream (const std::string& nm_arg, |
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41 ios::openmode md = ios::in|ios::out, |
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42 oct_mach_info::float_format flt_fmt) |
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43 : octave_base_stream (md, flt_fmt), nm (nm_arg) |
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44 { |
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45 // Override default protection of 0664 so that umask will appear to |
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46 // do the right thing. |
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47 |
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48 fs.open (nm.c_str (), md, 0666); |
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49 |
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50 if (! fs) |
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51 error (strerror (errno)); |
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52 } |
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53 |
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54 // Position a stream at OFFSET relative to ORIGIN. |
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55 |
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56 int |
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57 octave_fstream::seek (streamoff offset, ios::seek_dir origin) |
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58 { |
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59 int retval = -1; |
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60 |
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61 if (! fs.bad ()) |
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62 { |
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63 fs.clear (); |
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64 |
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65 filebuf *fb = fs.rdbuf (); |
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66 |
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67 if (fb) |
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68 { |
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69 fb->seekoff (offset, origin); |
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70 retval = fs.bad () ? -1 : 0; |
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71 } |
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72 } |
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73 |
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74 return retval; |
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75 } |
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76 |
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77 // Return current stream position. |
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78 |
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79 long |
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80 octave_fstream::tell (void) const |
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81 { |
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82 long retval = -1; |
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83 |
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84 if (fs) |
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85 { |
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86 filebuf *fb = fs.rdbuf (); |
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87 retval = static_cast<long> (fb->seekoff (0, ios::cur)); |
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88 } |
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89 |
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90 return retval; |
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91 } |
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92 |
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93 // Return non-zero if EOF has been reached on this stream. |
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94 |
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95 bool |
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96 octave_fstream::eof (void) const |
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97 { |
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98 return fs.eof (); |
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99 } |
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100 |
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101 std::istream * |
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102 octave_fstream::input_stream (void) |
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103 { |
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104 std::istream *retval = 0; |
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105 |
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106 if (mode () & ios::in) |
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107 retval = &fs; |
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108 |
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109 return retval; |
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110 } |
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111 |
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112 std::ostream * |
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113 octave_fstream::output_stream (void) |
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114 { |
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115 std::ostream *retval = 0; |
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116 |
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117 if (mode () & ios::out) |
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118 retval = &fs; |
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119 |
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120 return retval; |
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121 } |
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122 |
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123 /* |
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124 ;;; Local Variables: *** |
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125 ;;; mode: C++ *** |
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126 ;;; End: *** |
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127 */ |
