1 // Copyright 2019 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 #include "pw_sys_io/sys_io.h" 16 17 #include <cstdio> 18 19 namespace pw::sys_io { 20 ReadByte(std::byte * dest)21Status ReadByte(std::byte* dest) { 22 if (dest == nullptr) { 23 return Status::FailedPrecondition(); 24 } 25 26 int value = std::getchar(); 27 if (value == EOF) { 28 return Status::ResourceExhausted(); 29 } 30 *dest = static_cast<std::byte>(value); 31 return OkStatus(); 32 } 33 TryReadByte(std::byte *)34Status TryReadByte(std::byte*) { 35 // TryReadByte() is not (yet) supported on hosts. 36 return Status::Unimplemented(); 37 } 38 WriteByte(std::byte b)39Status WriteByte(std::byte b) { 40 if (std::putchar(static_cast<char>(b)) == EOF) { 41 return Status::Internal(); 42 } 43 return OkStatus(); 44 } 45 WriteLine(std::string_view s)46StatusWithSize WriteLine(std::string_view s) { 47 size_t chars_written = 0; 48 StatusWithSize size_result = WriteBytes(as_bytes(span(s))); 49 if (!size_result.ok()) { 50 return size_result; 51 } 52 chars_written += size_result.size(); 53 54 // Write trailing newline character. 55 Status result = WriteByte(static_cast<std::byte>('\n')); 56 if (result.ok()) { 57 chars_written++; 58 } 59 60 return StatusWithSize(result, chars_written); 61 } 62 63 } // namespace pw::sys_io 64