Abseil Common Libraries (C++) (grcp 依赖)
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72 lines
2.0 KiB
72 lines
2.0 KiB
// Copyright 2017 The Abseil Authors. |
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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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// https://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 "absl/strings/internal/str_format/output.h" |
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#include <errno.h> |
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#include <cstring> |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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namespace str_format_internal { |
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namespace { |
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struct ClearErrnoGuard { |
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ClearErrnoGuard() : old_value(errno) { errno = 0; } |
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~ClearErrnoGuard() { |
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if (!errno) errno = old_value; |
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} |
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int old_value; |
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}; |
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} // namespace |
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void BufferRawSink::Write(string_view v) { |
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size_t to_write = std::min(v.size(), size_); |
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std::memcpy(buffer_, v.data(), to_write); |
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buffer_ += to_write; |
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size_ -= to_write; |
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total_written_ += v.size(); |
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} |
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void FILERawSink::Write(string_view v) { |
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while (!v.empty() && !error_) { |
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// Reset errno to zero in case the libc implementation doesn't set errno |
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// when a failure occurs. |
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ClearErrnoGuard guard; |
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if (size_t result = std::fwrite(v.data(), 1, v.size(), output_)) { |
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// Some progress was made. |
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count_ += result; |
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v.remove_prefix(result); |
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} else { |
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if (errno == EINTR) { |
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continue; |
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} else if (errno) { |
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error_ = errno; |
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} else if (std::ferror(output_)) { |
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// Non-POSIX compliant libc implementations may not set errno, so we |
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// have check the streams error indicator. |
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error_ = EBADF; |
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} else { |
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// We're likely on a non-POSIX system that encountered EINTR but had no |
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// way of reporting it. |
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continue; |
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} |
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} |
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} |
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} |
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} // namespace str_format_internal |
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ABSL_NAMESPACE_END |
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} // namespace absl
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