| // Copyright 2017 The Abseil Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "absl/strings/internal/str_format/output.h" |
| |
| #include <errno.h> |
| #include <cstring> |
| |
| namespace absl { |
| ABSL_NAMESPACE_BEGIN |
| namespace str_format_internal { |
| |
| namespace { |
| struct ClearErrnoGuard { |
| ClearErrnoGuard() : old_value(errno) { errno = 0; } |
| ~ClearErrnoGuard() { |
| if (!errno) errno = old_value; |
| } |
| int old_value; |
| }; |
| } // namespace |
| |
| void BufferRawSink::Write(string_view v) { |
| size_t to_write = std::min(v.size(), size_); |
| std::memcpy(buffer_, v.data(), to_write); |
| buffer_ += to_write; |
| size_ -= to_write; |
| total_written_ += v.size(); |
| } |
| |
| void FILERawSink::Write(string_view v) { |
| while (!v.empty() && !error_) { |
| // Reset errno to zero in case the libc implementation doesn't set errno |
| // when a failure occurs. |
| ClearErrnoGuard guard; |
| |
| if (size_t result = std::fwrite(v.data(), 1, v.size(), output_)) { |
| // Some progress was made. |
| count_ += result; |
| v.remove_prefix(result); |
| } else { |
| if (errno == EINTR) { |
| continue; |
| } else if (errno) { |
| error_ = errno; |
| } else if (std::ferror(output_)) { |
| // Non-POSIX compliant libc implementations may not set errno, so we |
| // have check the streams error indicator. |
| error_ = EBADF; |
| } else { |
| // We're likely on a non-POSIX system that encountered EINTR but had no |
| // way of reporting it. |
| continue; |
| } |
| } |
| } |
| } |
| |
| } // namespace str_format_internal |
| ABSL_NAMESPACE_END |
| } // namespace absl |