70 lines
2 KiB
C++
70 lines
2 KiB
C++
// 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 {
|
|
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
|
|
} // namespace absl
|