296 lines
11 KiB
C
296 lines
11 KiB
C
/****************************************************************************
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* include/nuttx/streams.h
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*
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* Copyright (C) 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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#ifndef _INCLUDE_NUTTX_STREAMS_H
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#define _INCLUDE_NUTTX_STREAMS_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdio.h>
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* These are the generic representations of a streams used by the NuttX */
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struct lib_instream_s;
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struct lib_outstream_s;
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typedef int (*lib_getc_t)(FAR struct lib_instream_s *this);
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typedef void (*lib_putc_t)(FAR struct lib_outstream_s *this, int ch);
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typedef int (*lib_flush_t)(FAR struct lib_outstream_s *this);
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struct lib_instream_s
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{
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lib_getc_t get; /* Pointer to function to get one character */
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int nget; /* Total number of characters gotten. Written
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* by get method, readable by user */
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};
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struct lib_outstream_s
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{
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lib_putc_t put; /* Pointer to function to put one character */
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#ifdef CONFIG_STDIO_LINEBUFFER
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lib_flush_t flush; /* Pointer to function flush buffered characters */
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#endif
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int nput; /* Total number of characters put. Written
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* by put method, readable by user */
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};
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/* These are streams that operate on a fixed-sized block of memory */
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struct lib_meminstream_s
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{
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struct lib_instream_s public;
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FAR const char *buffer; /* Address of first byte in the buffer */
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int buflen; /* Size of the buffer in bytes */
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};
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struct lib_memoutstream_s
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{
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struct lib_outstream_s public;
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FAR char *buffer; /* Address of first byte in the buffer */
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int buflen; /* Size of the buffer in bytes */
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};
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/* These are streams that operate on a FILE */
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struct lib_stdinstream_s
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{
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struct lib_instream_s public;
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FAR FILE *stream;
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};
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struct lib_stdoutstream_s
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{
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struct lib_outstream_s public;
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FAR FILE *stream;
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};
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/* These are streams that operate on a file descriptor */
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struct lib_rawoutstream_s
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{
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struct lib_outstream_s public;
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int fd;
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};
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struct lib_rawinstream_s
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{
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struct lib_instream_s public;
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int fd;
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};
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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# define EXTERN extern "C"
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extern "C"
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{
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#else
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# define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: lib_meminstream, lib_memoutstream
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*
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* Description:
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* Initializes a stream for use with a fixed-size memory buffer.
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* Defined in lib/lib_meminstream.c and lib/lib_memoutstream.c
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*
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* Input parameters:
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* meminstream - User allocated, uninitialized instance of struct
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* lib_meminstream_s to be initialized.
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* memoutstream - User allocated, uninitialized instance of struct
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* lib_memoutstream_s to be initialized.
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* bufstart - Address of the beginning of the fixed-size memory buffer
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* buflen - Size of the fixed-sized memory buffer in bytes
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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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EXTERN void lib_meminstream(FAR struct lib_meminstream_s *meminstream,
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FAR const char *bufstart, int buflen);
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EXTERN void lib_memoutstream(FAR struct lib_memoutstream_s *memoutstream,
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FAR char *bufstart, int buflen);
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/****************************************************************************
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* Name: lib_stdinstream, lib_stdoutstream
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*
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* Description:
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* Initializes a stream for use with a FILE instance.
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* Defined in lib/lib_stdinstream.c and lib/lib_stdoutstream.c
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*
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* Input parameters:
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* stdinstream - User allocated, uninitialized instance of struct
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* lib_stdinstream_s to be initialized.
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* stdoutstream - User allocated, uninitialized instance of struct
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* lib_stdoutstream_s to be initialized.
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* stream - User provided stream instance (must have been opened for
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* 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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EXTERN void lib_stdinstream(FAR struct lib_stdinstream_s *stdinstream,
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FAR FILE *stream);
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EXTERN void lib_stdoutstream(FAR struct lib_stdoutstream_s *stdoutstream,
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FAR FILE *stream);
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/****************************************************************************
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* Name: lib_rawinstream, lib_rawoutstream
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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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* Defined in lib/lib_rawinstream.c and lib/lib_rawoutstream.c
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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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* rawoutstream - User allocated, uninitialized instance of struct
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* lib_rawoutstream_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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EXTERN void lib_rawinstream(FAR struct lib_rawinstream_s *rawinstream,
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int fd);
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EXTERN void lib_rawoutstream(FAR struct lib_rawoutstream_s *rawoutstream,
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int fd);
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/****************************************************************************
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* Name: lib_lowinstream, lib_lowoutstream
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*
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* Description:
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* Initializes a stream for use with low-level, architecture-specific I/O.
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* Defined in lib/lib_lowinstream.c and lib/lib_lowoutstream.c
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*
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* Input parameters:
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* lowinstream - User allocated, uninitialized instance of struct
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* lib_lowinstream_s to be initialized.
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* lowoutstream - User allocated, uninitialized instance of struct
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* lib_lowoutstream_s to be initialized.
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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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#ifdef CONFIG_ARCH_LOWGETC
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EXTERN void lib_lowinstream(FAR struct lib_instream_s *lowinstream);
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#endif
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#ifdef CONFIG_ARCH_LOWPUTC
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EXTERN void lib_lowoutstream(FAR struct lib_outstream_s *lowoutstream);
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#endif
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/****************************************************************************
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* Name: lib_zeroinstream, lib_nullinstream, lib_nulloutstream
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*
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* Description:
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* Initializes NULL streams:
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*
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* o The stream created by lib_zeroinstream will return an infinitely long
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* stream of zeroes. Defined in lib/lib_zeroinstream.c
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* o The stream created by lib_nullinstream will return only EOF.
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* Defined in lib/lib_nullinstream.c
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* o The stream created by lib_nulloutstream will write all data to the
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* bit-bucket. Defined in lib/lib_nulloutstream.c
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*
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* Input parameters:
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* zeroinstream - User allocated, uninitialized instance of struct
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* lib_instream_s to be initialized.
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* nullinstream - User allocated, uninitialized instance of struct
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* lib_instream_s to be initialized.
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* nulloutstream - User allocated, uninitialized instance of struct
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* lib_outstream_s to be initialized.
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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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EXTERN void lib_zeroinstream(FAR struct lib_instream_s *zeroinstream);
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EXTERN void lib_nullinstream(FAR struct lib_instream_s *nullinstream);
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EXTERN void lib_nulloutstream(FAR struct lib_outstream_s *nulloutstream);
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/****************************************************************************
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* Name: lib_sylogstream
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*
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* Description:
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* Initializes a stream for use with the configured syslog interface.
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*
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* Input parameters:
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* lowoutstream - User allocated, uninitialized instance of struct
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* lib_lowoutstream_s to be initialized.
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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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#ifdef CONFIG_SYSLOG
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EXTERN void lib_syslogstream(FAR struct lib_outstream_s *stream);
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#endif
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* _INCLUDE_NUTTX_STREAMS_H */
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