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annotate libinterp/corefcn/ls-ascii-helper.cc @ 27956:2310164737b3 stable

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fix many spelling errors (bug #57613)
author John W. Eaton <jwe@octave.org>
date Fri, 17 Jan 2020 13:15:27 -0600
parents 00f796120a6d
children c20b7290c778
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) 2009-2019 Benjamin Lindner
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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 (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 "ls-ascii-helper.h"
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28
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29 #include <istream>
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30 #include <sstream>
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31
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32 // Helper functions when reading from ascii files.
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33
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34 // These function take care of CR/LF issues when files are opened in
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35 // text-mode for reading.
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36
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37 // Skip characters from stream IS until a newline is reached.
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38 // Depending on KEEP_NEWLINE, either eat newline from stream or
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39 // keep it unread.
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40
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41 void
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42 skip_until_newline (std::istream& is, bool keep_newline)
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43 {
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44 if (! is)
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45 return;
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46
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47 while (is)
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48 {
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49 char c = is.peek ();
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50
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51 if (c == '\n' || c == '\r')
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52 {
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53 // Reached newline.
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54 if (! keep_newline)
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55 {
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56 // Eat the CR or LF character.
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57 char d;
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58 is.get (d);
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59
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60 // Make sure that for binary-mode opened ascii files
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61 // containing CRLF line endings we skip the LF after CR.
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62 if (c == '\r' && is.peek () == '\n')
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63 {
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64 // Yes, LF following CR, eat it.
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65 is.get (d);
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66 }
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67 }
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68
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69 // Newline was found, and read from stream if
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70 // keep_newline == true, so exit loop.
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71 break;
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72 }
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73 else
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74 {
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75 // No newline character peeked, so read it and proceed to next
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76 // character.
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77 char d;
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78 is.get (d);
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79 }
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80 }
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81 }
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82
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83 // If stream IS currently points to a newline (a leftover from a previous read)
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84 // then eat newline(s) until a non-newline character is found.
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85
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86 void
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87 skip_preceeding_newline (std::istream& is)
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88 {
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89 if (! is)
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90 return;
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91
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92 // Check whether IS currently points to newline character.
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93 char c = is.peek ();
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94
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95 if (c == '\n' || c == '\r')
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96 {
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97 // Yes, at newline.
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98 do
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99 {
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100 // Eat the CR or LF character.
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101 char d;
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102 is.get (d);
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103
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104 // Make sure that for binary-mode opened ascii files
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105 // containing CRLF line endings we skip the LF after CR.
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106 if (c == '\r' && is.peek () == '\n')
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107 {
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108 // Yes, LF following CR, eat it.
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109 is.get (d);
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110 }
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111
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112 // Peek into next character.
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113 c = is.peek ();
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114
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115 // Loop while still a newline ahead.
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116 }
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117 while (c == '\n' || c == '\r');
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118 }
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119 }
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120
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121 // Read characters from stream IS until a newline is reached.
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122 // Depending on KEEP_NEWLINE, either eat newline from stream or keep
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123 // it unread. Characters read are stored and returned as
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124 // std::string.
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125
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126 std::string
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127 read_until_newline (std::istream& is, bool keep_newline)
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128 {
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129 if (! is)
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130 return "";
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131
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132 std::ostringstream buf;
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133
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134 while (is)
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135 {
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136 char c = is.peek ();
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137
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138 if (c == '\n' || c == '\r')
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139 {
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140 // Reached newline.
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141 if (! keep_newline)
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142 {
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143 // Eat the CR or LF character.
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144 char d;
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145 is.get (d);
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146
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147 // Make sure that for binary-mode opened ascii files
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148 // containing CRLF line endings we skip the LF after
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149 // CR.
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150
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151 if (c == '\r' && is.peek () == '\n')
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152 {
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153 // Yes, LF following CR, eat it.
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154 is.get (d);
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155 }
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156 }
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157
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158 // Newline was found, and read from stream if
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159 // keep_newline == true, so exit loop.
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160 break;
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161 }
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162 else
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163 {
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164 // No newline character peeked, so read it, store it, and
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165 // proceed to next.
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166 char d;
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167 is.get (d);
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168 buf << d;
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169 }
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170 }
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171
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172 return buf.str ();
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173 }