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// 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 Status::Ok();
}
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 Status::Ok();
}
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
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