64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
|
// Copyright 2019 The Pigweed 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 "pw_sys_io/sys_io.h"
|
||
|
|
|
||
|
|
#include <cstdio>
|
||
|
|
|
||
|
|
namespace pw::sys_io {
|
||
|
|
|
||
|
|
Status ReadByte(std::byte* dest) {
|
||
|
|
if (dest == nullptr) {
|
||
|
|
return Status::FailedPrecondition();
|
||
|
|
}
|
||
|
|
|
||
|
|
int value = std::getchar();
|
||
|
|
if (value == EOF) {
|
||
|
|
return Status::ResourceExhausted();
|
||
|
|
}
|
||
|
|
*dest = static_cast<std::byte>(value);
|
||
|
|
return OkStatus();
|
||
|
|
}
|
||
|
|
|
||
|
|
Status TryReadByte(std::byte*) {
|
||
|
|
// TryReadByte() is not (yet) supported on hosts.
|
||
|
|
return Status::Unimplemented();
|
||
|
|
}
|
||
|
|
|
||
|
|
Status WriteByte(std::byte b) {
|
||
|
|
if (std::putchar(static_cast<char>(b)) == EOF) {
|
||
|
|
return Status::Internal();
|
||
|
|
}
|
||
|
|
return OkStatus();
|
||
|
|
}
|
||
|
|
|
||
|
|
StatusWithSize WriteLine(const std::string_view& s) {
|
||
|
|
size_t chars_written = 0;
|
||
|
|
StatusWithSize size_result = WriteBytes(std::as_bytes(std::span(s)));
|
||
|
|
if (!size_result.ok()) {
|
||
|
|
return size_result;
|
||
|
|
}
|
||
|
|
chars_written += size_result.size();
|
||
|
|
|
||
|
|
// Write trailing newline character.
|
||
|
|
Status result = WriteByte(static_cast<std::byte>('\n'));
|
||
|
|
if (result.ok()) {
|
||
|
|
chars_written++;
|
||
|
|
}
|
||
|
|
|
||
|
|
return StatusWithSize(result, chars_written);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace pw::sys_io
|