467 lines
16 KiB
C
467 lines
16 KiB
C
/****************************************************************************
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* include/nuttx/streams.h
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*
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* Copyright (C) 2009, 2011-2012, 2014-2016 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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* Pre-processor 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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typedef int (*lib_getc_t)(FAR struct lib_instream_s *this);
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struct lib_outstream_s;
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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; /* Get one character from the instream */
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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; /* Put one character to the outstream */
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lib_flush_t flush; /* Flush any buffered characters in the outstream */
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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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/* Seek-able streams */
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struct lib_sistream_s;
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typedef int (*lib_sigetc_t)(FAR struct lib_sistream_s *this);
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typedef off_t (*lib_siseek_t)(FAR struct lib_sistream_s *this, off_t offset,
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int whence);
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struct lib_sostream_s;
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typedef void (*lib_soputc_t)(FAR struct lib_sostream_s *this, int ch);
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typedef int (*lib_soflush_t)(FAR struct lib_sostream_s *this);
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typedef off_t (*lib_soseek_t)(FAR struct lib_sostream_s *this, off_t offset,
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int whence);
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struct lib_sistream_s
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{
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lib_sigetc_t get; /* Get one character from the instream */
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lib_siseek_t seek; /* Seek to a position in the instream */
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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_sostream_s
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{
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lib_soputc_t put; /* Put one character to the outstream */
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lib_soflush_t flush; /* Flush any buffered characters in the outstream */
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lib_soseek_t seek; /* Seek a position in the output stream */
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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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size_t 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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size_t buflen; /* Size of the buffer in bytes */
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};
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struct lib_memsistream_s
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{
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struct lib_sistream_s public;
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FAR const char *buffer; /* Address of first byte in the buffer */
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size_t offset; /* Current buffer offset in bytes */
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size_t buflen; /* Size of the buffer in bytes */
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};
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struct lib_memsostream_s
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{
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struct lib_sostream_s public;
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FAR char *buffer; /* Address of first byte in the buffer */
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size_t offset; /* Current buffer offset in bytes */
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size_t 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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struct lib_stdsistream_s
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{
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struct lib_sistream_s public;
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FAR FILE *stream;
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};
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struct lib_stdsostream_s
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{
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struct lib_sostream_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_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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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_rawsistream_s
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{
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struct lib_sistream_s public;
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int fd;
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};
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struct lib_rawsostream_s
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{
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struct lib_sostream_s public;
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int fd;
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};
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/* This is a special stream that does buffered character I/O. NOTE that is
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* CONFIG_SYSLOG_BUFFER is not defined, it is the same as struct
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* lib_outstream_s
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*/
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struct iob_s; /* Forward reference */
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struct lib_syslogstream_s
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{
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struct lib_outstream_s public;
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#ifdef CONFIG_SYSLOG_BUFFER
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FAR struct iob_s *iob;
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#endif
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};
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/****************************************************************************
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* Public Data
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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, lib_memsistream, lib_memsostream
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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/stdio/lib_meminstream.c and lib/stdio/lib_memoutstream.c.
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* Seekable versions are defined in lib/stdio/lib_memsistream.c and
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* lib/stdio/lib_memsostream.c.
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*
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* Input parameters:
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* memstream - User allocated, uninitialized instance of struct
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* lib_meminstream_s to be initialized.
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* memstream - 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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void lib_meminstream(FAR struct lib_meminstream_s *instream,
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FAR const char *bufstart, int buflen);
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void lib_memoutstream(FAR struct lib_memoutstream_s *outstream,
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FAR char *bufstart, int buflen);
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void lib_memsistream(FAR struct lib_memsistream_s *instream,
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FAR const char *bufstart, int buflen);
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void lib_memsostream(FAR struct lib_memsostream_s *outstream,
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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/stdio/lib_stdinstream.c and lib/stdio/lib_stdoutstream.c
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*
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* Input parameters:
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* instream - User allocated, uninitialized instance of struct
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* lib_stdinstream_s to be initialized.
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* outstream - 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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void lib_stdinstream(FAR struct lib_stdinstream_s *instream,
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FAR FILE *stream);
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void lib_stdoutstream(FAR struct lib_stdoutstream_s *outstream,
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FAR FILE *stream);
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void lib_stdsistream(FAR struct lib_stdsistream_s *instream,
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FAR FILE *stream);
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void lib_stdsostream(FAR struct lib_stdsostream_s *outstream,
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FAR FILE *stream);
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/****************************************************************************
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* Name: lib_rawinstream, lib_rawoutstream, lib_rawsistream, and
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* lib_rawsostream,
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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/stdio/lib_rawinstream.c and lib/stdio/lib_rawoutstream.c.
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* Seekable versions are defined in lib/stdio/lib_rawsistream.c and
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* lib/stdio/lib_rawsostream.c
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*
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* Input parameters:
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* instream - User allocated, uninitialized instance of struct
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* lib_rawinstream_s to be initialized.
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* outstream - 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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void lib_rawinstream(FAR struct lib_rawinstream_s *instream, int fd);
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void lib_rawoutstream(FAR struct lib_rawoutstream_s *outstream, int fd);
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void lib_rawsistream(FAR struct lib_rawsistream_s *instream, int fd);
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void lib_rawsostream(FAR struct lib_rawsostream_s *outstream, int fd);
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/****************************************************************************
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* Name: 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 output.
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* Defined in ib/stdio/lib_lowoutstream.c
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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_ARCH_LOWPUTC
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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/stdio/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/stdio/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/stdio/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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void lib_zeroinstream(FAR struct lib_instream_s *zeroinstream);
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void lib_nullinstream(FAR struct lib_instream_s *nullinstream);
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void lib_nulloutstream(FAR struct lib_outstream_s *nulloutstream);
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/****************************************************************************
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* Name: syslogstream_create
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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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* Only accessible from with the OS SYSLOG logic.
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*
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* Input parameters:
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* stream - 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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void syslogstream_create(FAR struct lib_syslogstream_s *stream);
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/****************************************************************************
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* Name: syslogstream_destroy
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*
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* Description:
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* Free resources held by the syslog stream.
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*
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* Input parameters:
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* stream - 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 (Resources freed).
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*
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****************************************************************************/
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#ifdef CONFIG_SYSLOG_BUFFER
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void syslogstream_destroy(FAR struct lib_syslogstream_s *stream);
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#else
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# define syslogstream_destroy(s)
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#endif
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/****************************************************************************
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* Name: emergstream
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*
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* Description:
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* Initializes a stream for use with the configured emergency syslog
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* interface. Only accessible from with the OS SYSLOG logic.
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*
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* Input parameters:
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* stream - 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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void emergstream(FAR struct lib_outstream_s *stream);
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/****************************************************************************
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* Name: lib_noflush
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*
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* Description:
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* lib_noflush() provides a common, dummy flush method for output streams
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* that are not flushable.
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*
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* Return:
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* Always returns OK
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*
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****************************************************************************/
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int lib_noflush(FAR struct lib_outstream_s *stream);
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/****************************************************************************
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* Name: lib_snoflush
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*
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* Description:
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* lib_snoflush() provides a common, dummy flush method for seekable output
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* streams that are not flushable.
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* is selected.
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*
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* Return:
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* Always returns OK
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*
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****************************************************************************/
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int lib_snoflush(FAR struct lib_sostream_s *this);
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/****************************************************************************
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* Name: lib_sprintf and lib_vsprintf
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*
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* Description:
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* Stream-oriented versions of sprintf and vsprintf.
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*
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****************************************************************************/
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int lib_sprintf(FAR struct lib_outstream_s *obj,
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FAR const IPTR char *fmt, ...);
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int lib_vsprintf(FAR struct lib_outstream_s *obj,
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FAR const IPTR char *src, va_list ap);
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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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