/**************************************************************************** * include/nuttx/streams.h * * Copyright (C) 2009, 2011-2012 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ #ifndef _INCLUDE_NUTTX_STREAMS_H #define _INCLUDE_NUTTX_STREAMS_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include /**************************************************************************** * Definitions ****************************************************************************/ /**************************************************************************** * Public Types ****************************************************************************/ /* These are the generic representations of a streams used by the NuttX */ struct lib_instream_s; struct lib_outstream_s; typedef int (*lib_getc_t)(FAR struct lib_instream_s *this); typedef void (*lib_putc_t)(FAR struct lib_outstream_s *this, int ch); typedef int (*lib_flush_t)(FAR struct lib_outstream_s *this); struct lib_instream_s { lib_getc_t get; /* Pointer to function to get one character */ int nget; /* Total number of characters gotten. Written * by get method, readable by user */ }; struct lib_outstream_s { lib_putc_t put; /* Pointer to function to put one character */ #ifdef CONFIG_STDIO_LINEBUFFER lib_flush_t flush; /* Pointer to function flush buffered characters */ #endif int nput; /* Total number of characters put. Written * by put method, readable by user */ }; /* These are streams that operate on a fixed-sized block of memory */ struct lib_meminstream_s { struct lib_instream_s public; FAR const char *buffer; /* Address of first byte in the buffer */ int buflen; /* Size of the buffer in bytes */ }; struct lib_memoutstream_s { struct lib_outstream_s public; FAR char *buffer; /* Address of first byte in the buffer */ int buflen; /* Size of the buffer in bytes */ }; /* These are streams that operate on a FILE */ struct lib_stdinstream_s { struct lib_instream_s public; FAR FILE *stream; }; struct lib_stdoutstream_s { struct lib_outstream_s public; FAR FILE *stream; }; /* These are streams that operate on a file descriptor */ struct lib_rawoutstream_s { struct lib_outstream_s public; int fd; }; struct lib_rawinstream_s { struct lib_instream_s public; int fd; }; /**************************************************************************** * Public Variables ****************************************************************************/ #undef EXTERN #if defined(__cplusplus) # define EXTERN extern "C" extern "C" { #else # define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: lib_meminstream, lib_memoutstream * * Description: * Initializes a stream for use with a fixed-size memory buffer. * Defined in lib/lib_meminstream.c and lib/lib_memoutstream.c * * Input parameters: * meminstream - User allocated, uninitialized instance of struct * lib_meminstream_s to be initialized. * memoutstream - User allocated, uninitialized instance of struct * lib_memoutstream_s to be initialized. * bufstart - Address of the beginning of the fixed-size memory buffer * buflen - Size of the fixed-sized memory buffer in bytes * * Returned Value: * None (User allocated instance initialized). * ****************************************************************************/ EXTERN void lib_meminstream(FAR struct lib_meminstream_s *meminstream, FAR const char *bufstart, int buflen); EXTERN void lib_memoutstream(FAR struct lib_memoutstream_s *memoutstream, FAR char *bufstart, int buflen); /**************************************************************************** * Name: lib_stdinstream, lib_stdoutstream * * Description: * Initializes a stream for use with a FILE instance. * Defined in lib/lib_stdinstream.c and lib/lib_stdoutstream.c * * Input parameters: * stdinstream - User allocated, uninitialized instance of struct * lib_stdinstream_s to be initialized. * stdoutstream - User allocated, uninitialized instance of struct * lib_stdoutstream_s to be initialized. * stream - User provided stream instance (must have been opened for * the correct access). * * Returned Value: * None (User allocated instance initialized). * ****************************************************************************/ EXTERN void lib_stdinstream(FAR struct lib_stdinstream_s *stdinstream, FAR FILE *stream); EXTERN void lib_stdoutstream(FAR struct lib_stdoutstream_s *stdoutstream, FAR FILE *stream); /**************************************************************************** * Name: lib_rawinstream, lib_rawoutstream * * Description: * Initializes a stream for use with a file descriptor. * Defined in lib/lib_rawinstream.c and lib/lib_rawoutstream.c * * Input parameters: * rawinstream - User allocated, uninitialized instance of struct * lib_rawinstream_s to be initialized. * rawoutstream - User allocated, uninitialized instance of struct * lib_rawoutstream_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). * ****************************************************************************/ EXTERN void lib_rawinstream(FAR struct lib_rawinstream_s *rawinstream, int fd); EXTERN void lib_rawoutstream(FAR struct lib_rawoutstream_s *rawoutstream, int fd); /**************************************************************************** * Name: lib_lowinstream, lib_lowoutstream * * Description: * Initializes a stream for use with low-level, architecture-specific I/O. * Defined in lib/lib_lowinstream.c and lib/lib_lowoutstream.c * * Input parameters: * lowinstream - User allocated, uninitialized instance of struct * lib_lowinstream_s to be initialized. * lowoutstream - User allocated, uninitialized instance of struct * lib_lowoutstream_s to be initialized. * * Returned Value: * None (User allocated instance initialized). * ****************************************************************************/ #ifdef CONFIG_ARCH_LOWGETC EXTERN void lib_lowinstream(FAR struct lib_instream_s *lowinstream); #endif #ifdef CONFIG_ARCH_LOWPUTC EXTERN void lib_lowoutstream(FAR struct lib_outstream_s *lowoutstream); #endif /**************************************************************************** * Name: lib_zeroinstream, lib_nullinstream, lib_nulloutstream * * Description: * Initializes NULL streams: * * o The stream created by lib_zeroinstream will return an infinitely long * stream of zeroes. Defined in lib/lib_zeroinstream.c * o The stream created by lib_nullinstream will return only EOF. * Defined in lib/lib_nullinstream.c * o The stream created by lib_nulloutstream will write all data to the * bit-bucket. Defined in lib/lib_nulloutstream.c * * Input parameters: * zeroinstream - User allocated, uninitialized instance of struct * lib_instream_s to be initialized. * nullinstream - User allocated, uninitialized instance of struct * lib_instream_s to be initialized. * nulloutstream - User allocated, uninitialized instance of struct * lib_outstream_s to be initialized. * * Returned Value: * None (User allocated instance initialized). * ****************************************************************************/ EXTERN void lib_zeroinstream(FAR struct lib_instream_s *zeroinstream); EXTERN void lib_nullinstream(FAR struct lib_instream_s *nullinstream); EXTERN void lib_nulloutstream(FAR struct lib_outstream_s *nulloutstream); /**************************************************************************** * Name: lib_sylogstream * * Description: * Initializes a stream for use with the configured syslog interface. * * Input parameters: * lowoutstream - User allocated, uninitialized instance of struct * lib_lowoutstream_s to be initialized. * * Returned Value: * None (User allocated instance initialized). * ****************************************************************************/ #ifdef CONFIG_SYSLOG EXTERN void lib_syslogstream(FAR struct lib_outstream_s *stream); #endif #undef EXTERN #if defined(__cplusplus) } #endif #endif /* _INCLUDE_NUTTX_STREAMS_H */