mirror of
https://gitlab.isc.org/isc-projects/kea
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75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
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// Copyright (C) 2012 Internet Systems Consortium, Inc. ("ISC")
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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#include <dns/inputsource.h>
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#include <exceptions/exceptions.h>
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namespace isc {
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namespace dns {
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namespace master_lexer_internal {
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int
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InputSource::getChar() {
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if (buffer_pos_ == buffer_.size()) {
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// We may have reached EOF at the last call to
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// getChar(). at_eof_ will be set then. We then simply return
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// early.
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if (at_eof_) {
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return -1;
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}
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// We are not yet at EOF. Read from the stream.
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int c = input_.get();
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// Have we reached EOF now? If so, set at_eof_ and return early,
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// but don't modify buffer_pos_ (which should still be equal to
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// the size of buffer_).
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if (!input_.good()) {
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at_eof_ = true;
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return -1;
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}
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buffer_.push_back(c);
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}
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int c = buffer_[buffer_pos_++];
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if (c == '\n') {
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line_++;
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}
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return (c);
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}
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void
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InputSource::ungetChar() {
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if (at_eof_) {
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at_eof_ = false;
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} else if (buffer_pos_ == 0) {
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isc_throw(OutOfRange, "Cannot skip before the start of buffer");
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} else {
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if (buffer_[buffer_pos_] == '\n') {
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line_--;
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}
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buffer_pos_--;
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}
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}
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void
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InputSource::ungetAll() {
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buffer_pos_ = 0;
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line_ = saved_line_;
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at_eof_ = false;
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}
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} // namespace master_lexer_internal
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} // namespace dns
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} // namespace isc
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