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107 lines
3.9 KiB
107 lines
3.9 KiB
/**************************************************************************** |
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* libc/stdio/lib_rawinstream.c |
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* |
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* Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <unistd.h> |
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#include <assert.h> |
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#include <errno.h> |
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#include "lib_internal.h" |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: rawinstream_getc |
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****************************************************************************/ |
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static int rawinstream_getc(FAR struct lib_instream_s *this) |
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{ |
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FAR struct lib_rawinstream_s *rthis = (FAR struct lib_rawinstream_s *)this; |
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int nwritten; |
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char ch; |
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DEBUGASSERT(this && rthis->fd >= 0); |
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/* Attempt to read one character */ |
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nwritten = read(rthis->fd, &ch, 1); |
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if (nwritten == 1) |
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{ |
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this->nget++; |
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return ch; |
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} |
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/* Return EOF on any failure to read from the incoming byte stream. The |
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* only expected error is EINTR meaning that the read was interrupted |
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* by a signal. A Zero return value would indicated an end-of-file |
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* confition. |
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*/ |
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return EOF; |
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} |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: lib_rawinstream |
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* |
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* Description: |
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* Initializes a stream for use with a file descriptor. |
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* |
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* Input parameters: |
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* rawinstream - User allocated, uninitialized instance of struct |
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* lib_rawinstream_s to be initialized. |
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* fd - User provided file/socket descriptor (must have been opened |
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* for the correct access). |
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* |
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* Returned Value: |
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* None (User allocated instance initialized). |
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* |
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****************************************************************************/ |
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void lib_rawinstream(FAR struct lib_rawinstream_s *rawinstream, int fd) |
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{ |
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rawinstream->public.get = rawinstream_getc; |
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rawinstream->public.nget = 0; |
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rawinstream->fd = fd; |
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} |
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