Mercurial > octave
view libinterp/corefcn/ls-ascii-helper.cc @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
parents | b442ec6dda5c |
children | bd51beb6205e |
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/* Copyright (C) 2009-2020 The Octave Project Developers See the file COPYRIGHT.md in the top-level directory of this distribution or <https://octave.org/COPYRIGHT.html/>. This file is part of Octave. Octave is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <https://www.gnu.org/licenses/>. */ #if defined (HAVE_CONFIG_H) # include "config.h" #endif #include "ls-ascii-helper.h" #include <istream> #include <sstream> // Helper functions when reading from ascii files. // These function take care of CR/LF issues when files are opened in // text-mode for reading. // Skip characters from stream IS until a newline is reached. // Depending on KEEP_NEWLINE, either eat newline from stream or // keep it unread. void skip_until_newline (std::istream& is, bool keep_newline) { if (! is) return; while (is) { char c = is.peek (); if (c == '\n' || c == '\r') { // Reached newline. if (! keep_newline) { // Eat the CR or LF character. char d; is.get (d); // Make sure that for binary-mode opened ascii files // containing CRLF line endings we skip the LF after CR. if (c == '\r' && is.peek () == '\n') { // Yes, LF following CR, eat it. is.get (d); } } // Newline was found, and read from stream if // keep_newline == true, so exit loop. break; } else { // No newline charater peeked, so read it and proceed to next // character. char d; is.get (d); } } } // If stream IS currently points to a newline (a leftover from a previous read) // then eat newline(s) until a non-newline character is found. void skip_preceeding_newline (std::istream& is) { if (! is) return; // Check whether IS currently points to newline character. char c = is.peek (); if (c == '\n' || c == '\r') { // Yes, at newline. do { // Eat the CR or LF character. char d; is.get (d); // Make sure that for binary-mode opened ascii files // containing CRLF line endings we skip the LF after CR. if (c == '\r' && is.peek () == '\n') { // Yes, LF following CR, eat it. is.get (d); } // Peek into next character. c = is.peek (); // Loop while still a newline ahead. } while (c == '\n' || c == '\r'); } } // Read charaters from stream IS until a newline is reached. // Depending on KEEP_NEWLINE, either eat newline from stream or keep // it unread. Characters read are stored and returned as // std::string. std::string read_until_newline (std::istream& is, bool keep_newline) { if (! is) return ""; std::ostringstream buf; while (is) { char c = is.peek (); if (c == '\n' || c == '\r') { // Reached newline. if (! keep_newline) { // Eat the CR or LF character. char d; is.get (d); // Make sure that for binary-mode opened ascii files // containing CRLF line endings we skip the LF after // CR. if (c == '\r' && is.peek () == '\n') { // Yes, LF following CR, eat it. is.get (d); } } // Newline was found, and read from stream if // keep_newline == true, so exit loop. break; } else { // No newline charater peeked, so read it, store it, and // proceed to next. char d; is.get (d); buf << d; } } return buf.str (); }