b23701f7d0
Original-commit: flang-compiler/f18@279af1e817 Reviewed-on: https://github.com/flang-compiler/f18/pull/106
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
// Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "char-buffer.h"
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#include "../common/idioms.h"
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#include <algorithm>
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#include <cstddef>
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#include <cstring>
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namespace Fortran::parser {
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char *CharBuffer::FreeSpace(std::size_t *n) {
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int offset{LastBlockOffset()};
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if (blocks_.empty()) {
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blocks_.emplace_front();
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last_ = blocks_.begin();
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lastBlockEmpty_ = true;
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} else if (offset == 0 && !lastBlockEmpty_) {
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last_ = blocks_.emplace_after(last_);
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lastBlockEmpty_ = true;
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}
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*n = Block::capacity - offset;
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return last_->data + offset;
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}
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void CharBuffer::Claim(std::size_t n) {
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if (n > 0) {
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bytes_ += n;
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lastBlockEmpty_ = false;
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}
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}
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void CharBuffer::Put(const char *data, std::size_t n) {
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std::size_t chunk;
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for (std::size_t at{0}; at < n; at += chunk) {
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char *to{FreeSpace(&chunk)};
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chunk = std::min(n - at, chunk);
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Claim(chunk);
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std::memcpy(to, data + at, chunk);
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}
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}
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void CharBuffer::Put(const std::string &str) { Put(str.data(), str.size()); }
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} // namespace Fortran::parser
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