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annotate libinterp/corefcn/ls-ascii-helper.cc @ 30564:796f54d4ddbf stable

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update Octave Project Developers copyright for the new year In files that have the "Octave Project Developers" copyright notice, update for 2021. In all .txi and .texi files except gpl.txi and gpl.texi in the doc/liboctave and doc/interpreter directories, change the copyright to "Octave Project Developers", the same as used for other source files. Update copyright notices for 2022 (not done since 2019). For gpl.txi and gpl.texi, change the copyright notice to be "Free Software Foundation, Inc." and leave the date at 2007 only because this file only contains the text of the GPL, not anything created by the Octave Project Developers. Add Paul Thomas to contributors.in.
author John W. Eaton <jwe@octave.org>
date Tue, 28 Dec 2021 18:22:40 -0500
parents 75dff8f2de2e
children e88a07dec498
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2009-2022 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 OCTAVE_NAMESPACE_BEGIN
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36
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37 // Helper functions when reading from ascii files.
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38
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39 // These functions take care of different line endings (LF, CR, CRLF)
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40 // when files were opened in text mode for writing and are now opened in
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41 // binary mode for reading.
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42 // Even though we no longer store files in text mode, keep this logic
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43 // to allow loading older files that might have CRLF or CR line endings.
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44
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45 // Skip characters from stream IS until a newline is reached.
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46 // Depending on KEEP_NEWLINE, either eat newline from stream or
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47 // keep it unread.
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48
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49 void
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50 skip_until_newline (std::istream& is, bool keep_newline)
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51 {
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52 if (! is)
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53 return;
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54
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55 while (is)
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56 {
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57 char c = is.peek ();
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58
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59 if (c == '\n' || c == '\r')
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60 {
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61 // Reached newline.
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62 if (! keep_newline)
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63 {
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64 // Eat the CR or LF character.
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65 char d;
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66 is.get (d);
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67
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68 // Make sure that for binary-mode opened ascii files
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69 // containing CRLF line endings we skip the LF after CR.
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70 if (c == '\r' && is.peek () == '\n')
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71 {
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72 // Yes, LF following CR, eat it.
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73 is.get (d);
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74 }
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75 }
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76
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77 // Newline was found, and read from stream if
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78 // keep_newline == true, so exit loop.
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79 break;
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80 }
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81 else
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82 {
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83 // No newline character peeked, so read it and proceed to next
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84 // character.
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85 char d;
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86 is.get (d);
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87 }
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88 }
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89 }
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90
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91 // If stream IS currently points to a newline (a leftover from a previous read)
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92 // then eat newline(s) until a non-newline character is found.
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93
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94 void
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95 skip_preceeding_newline (std::istream& is)
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96 {
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97 if (! is)
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98 return;
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99
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100 // Check whether IS currently points to newline character.
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101 char c = is.peek ();
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102
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103 if (c == '\n' || c == '\r')
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104 {
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105 // Yes, at newline.
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106 do
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107 {
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108 // Eat the CR or LF character.
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109 char d;
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110 is.get (d);
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111
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112 // Make sure that for binary-mode opened ascii files
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113 // containing CRLF line endings we skip the LF after CR.
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114 if (c == '\r' && is.peek () == '\n')
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115 {
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116 // Yes, LF following CR, eat it.
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117 is.get (d);
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118 }
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119
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120 // Peek into next character.
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121 c = is.peek ();
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122
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123 // Loop while still a newline ahead.
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124 }
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125 while (c == '\n' || c == '\r');
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126 }
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127 }
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128
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129 // Read characters from stream IS until a newline is reached.
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130 // Depending on KEEP_NEWLINE, either eat newline from stream or keep
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131 // it unread. Characters read are stored and returned as
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132 // std::string.
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133
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134 std::string
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135 read_until_newline (std::istream& is, bool keep_newline)
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136 {
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137 if (! is)
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138 return "";
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139
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140 std::ostringstream buf;
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141
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142 while (is)
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143 {
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144 char c = is.peek ();
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145
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146 if (c == '\n' || c == '\r')
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147 {
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148 // Reached newline.
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149 if (! keep_newline)
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150 {
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151 // Eat the CR or LF character.
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152 char d;
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153 is.get (d);
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154
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155 // Make sure that for binary-mode opened ascii files
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156 // containing CRLF line endings we skip the LF after
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157 // CR.
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158
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159 if (c == '\r' && is.peek () == '\n')
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160 {
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161 // Yes, LF following CR, eat it.
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162 is.get (d);
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163 }
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164 }
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165
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166 // Newline was found, and read from stream if
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167 // keep_newline == true, so exit loop.
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168 break;
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169 }
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170 else
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171 {
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172 // No newline character peeked, so read it, store it, and
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173 // proceed to next.
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174 char d;
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175 is.get (d);
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176 buf << d;
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177 }
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178 }
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179
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180 return buf.str ();
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181 }
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182
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183 OCTAVE_NAMESPACE_END