94c298e2a0
-- 441d1aa02483cdc510eb2fef012b31384fd8e3a6 by Eric Fiselier <ericwf@google.com>: Fix str_format with non-POSIX libc implementations. PiperOrigin-RevId: 218441122 -- da6190130e74222af6eb161a5593364341370370 by Jon Cohen <cohenjon@google.com>: Refactor ExceptionSafetyTester::Test in order to remove the levels of indirection related to unpacking tuples. PiperOrigin-RevId: 218403355 GitOrigin-RevId: 441d1aa02483cdc510eb2fef012b31384fd8e3a6 Change-Id: I6f6b978eb96fe261e8ee41ecdce185e5356a601d
70 lines
2 KiB
C++
70 lines
2 KiB
C++
// 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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// 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 "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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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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} // namespace absl
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