| /**************************************************************************** |
| * libs/libc/stream/lib_rawinstream.c |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The |
| * ASF licenses this file to you 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 |
| * |
| * http://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. |
| * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| |
| #include <unistd.h> |
| #include <assert.h> |
| #include <errno.h> |
| |
| #include <nuttx/fs/fs.h> |
| |
| #include "libc.h" |
| |
| /**************************************************************************** |
| * Private Functions |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Name: rawinstream_getc |
| ****************************************************************************/ |
| |
| static int rawinstream_getc(FAR struct lib_instream_s *self) |
| { |
| FAR struct lib_rawinstream_s *stream = |
| (FAR struct lib_rawinstream_s *)self; |
| int nread; |
| char ch; |
| |
| DEBUGASSERT(self && stream->fd >= 0); |
| |
| /* Attempt to read one character */ |
| |
| nread = _NX_READ(stream->fd, &ch, 1); |
| if (nread == 1) |
| { |
| self->nget++; |
| return ch; |
| } |
| |
| /* Return EOF on any failure to read from the incoming byte stream. The |
| * only expected error is EINTR meaning that the read was interrupted |
| * by a signal. A Zero return value would indicate an end-of-file |
| * condition. |
| */ |
| |
| return EOF; |
| } |
| |
| /**************************************************************************** |
| * Name: rawinstream_getc |
| ****************************************************************************/ |
| |
| static int rawinstream_gets(FAR struct lib_instream_s *self, |
| FAR void *buffer, int len) |
| { |
| FAR struct lib_rawinstream_s *stream = |
| (FAR struct lib_rawinstream_s *)self; |
| int nread; |
| |
| DEBUGASSERT(self && stream->fd >= 0); |
| |
| /* Attempt to read one character */ |
| |
| nread = _NX_READ(stream->fd, buffer, len); |
| if (nread >= 0) |
| { |
| self->nget += nread; |
| } |
| else |
| { |
| nread = _NX_GETERRVAL(nread); |
| } |
| |
| return nread; |
| } |
| |
| /**************************************************************************** |
| * Public Functions |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Name: lib_rawinstream |
| * |
| * Description: |
| * Initializes a stream for use with a file descriptor. |
| * |
| * Input Parameters: |
| * stream - User allocated, uninitialized instance of struct |
| * lib_rawinstream_s to be initialized. |
| * fd - User provided file/socket descriptor (must have been opened |
| * for the correct access). |
| * |
| * Returned Value: |
| * None (User allocated instance initialized). |
| * |
| ****************************************************************************/ |
| |
| void lib_rawinstream(FAR struct lib_rawinstream_s *stream, int fd) |
| { |
| stream->common.getc = rawinstream_getc; |
| stream->common.gets = rawinstream_gets; |
| stream->common.nget = 0; |
| stream->fd = fd; |
| } |