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annotate libinterp/corefcn/ls-ascii-helper.cc @ 28993:cc287e633588 stable

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Always open files in binary mode for saving variables (bug #59238). * load-save.cc (load_save_system::save): Open ofstream in binary mode for all save file formats. This means that line endings are stored as-is and are no longer converted dependent on the platform. * ls-ascii-helper.cc: Add comment as a reminder to keep these functions even though we no longer save variables in files in text mode.
author Markus Mützel <markus.muetzel@gmx.de>
date Fri, 23 Oct 2020 18:59:29 +0200
parents c20b7290c778
children 0a5b15007766
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2009-2020 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 "ls-ascii-helper.h"
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31
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32 #include <istream>
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33 #include <sstream>
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34
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35 // Helper functions when reading from ascii files.
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36
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37 // These functions take care of different line endings (LF, CR, CRLF)
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38 // when files were opened in text mode for writing and are now opened in
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39 // binary mode for reading.
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40 // Even though we no longer store files in text mode, keep this logic
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41 // to allow loading older files that might have CRLF or CR line endings.
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42
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43 // Skip characters from stream IS until a newline is reached.
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44 // Depending on KEEP_NEWLINE, either eat newline from stream or
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45 // keep it unread.
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46
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47 void
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48 skip_until_newline (std::istream& is, bool keep_newline)
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49 {
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50 if (! is)
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51 return;
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52
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53 while (is)
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54 {
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55 char c = is.peek ();
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56
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57 if (c == '\n' || c == '\r')
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58 {
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59 // Reached newline.
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60 if (! keep_newline)
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61 {
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62 // Eat the CR or LF character.
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63 char d;
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64 is.get (d);
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65
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66 // Make sure that for binary-mode opened ascii files
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67 // containing CRLF line endings we skip the LF after CR.
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68 if (c == '\r' && is.peek () == '\n')
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69 {
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70 // Yes, LF following CR, eat it.
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71 is.get (d);
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72 }
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73 }
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74
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75 // Newline was found, and read from stream if
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76 // keep_newline == true, so exit loop.
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77 break;
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78 }
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79 else
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80 {
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81 // No newline character peeked, so read it and proceed to next
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82 // character.
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83 char d;
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84 is.get (d);
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85 }
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86 }
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87 }
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88
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89 // If stream IS currently points to a newline (a leftover from a previous read)
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90 // then eat newline(s) until a non-newline character is found.
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91
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92 void
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93 skip_preceeding_newline (std::istream& is)
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94 {
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95 if (! is)
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96 return;
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97
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98 // Check whether IS currently points to newline character.
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99 char c = is.peek ();
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100
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101 if (c == '\n' || c == '\r')
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102 {
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103 // Yes, at newline.
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104 do
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105 {
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106 // Eat the CR or LF character.
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107 char d;
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108 is.get (d);
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109
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110 // Make sure that for binary-mode opened ascii files
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111 // containing CRLF line endings we skip the LF after CR.
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112 if (c == '\r' && is.peek () == '\n')
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113 {
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114 // Yes, LF following CR, eat it.
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115 is.get (d);
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116 }
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117
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118 // Peek into next character.
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119 c = is.peek ();
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120
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121 // Loop while still a newline ahead.
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122 }
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123 while (c == '\n' || c == '\r');
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124 }
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125 }
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126
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127 // Read characters from stream IS until a newline is reached.
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128 // Depending on KEEP_NEWLINE, either eat newline from stream or keep
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129 // it unread. Characters read are stored and returned as
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130 // std::string.
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131
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132 std::string
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133 read_until_newline (std::istream& is, bool keep_newline)
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134 {
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135 if (! is)
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136 return "";
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137
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138 std::ostringstream buf;
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139
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140 while (is)
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141 {
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142 char c = is.peek ();
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143
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144 if (c == '\n' || c == '\r')
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145 {
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146 // Reached newline.
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147 if (! keep_newline)
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148 {
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149 // Eat the CR or LF character.
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150 char d;
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151 is.get (d);
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152
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153 // Make sure that for binary-mode opened ascii files
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154 // containing CRLF line endings we skip the LF after
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155 // CR.
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156
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157 if (c == '\r' && is.peek () == '\n')
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158 {
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159 // Yes, LF following CR, eat it.
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160 is.get (d);
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161 }
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162 }
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163
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164 // Newline was found, and read from stream if
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165 // keep_newline == true, so exit loop.
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166 break;
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167 }
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168 else
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169 {
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170 // No newline character peeked, so read it, store it, and
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171 // proceed to next.
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172 char d;
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173 is.get (d);
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174 buf << d;
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175 }
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176 }
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177
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178 return buf.str ();
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179 }