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stdio: Implement simple buffered out stream for vdprintf

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Improve performance for raw fd based printf like operation.

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
This commit is contained in:
Huang Qi
2023-02-27 18:32:38 +08:00
committed by Masayuki Ishikawa
parent e4d219ca06
commit b96035885a
5 changed files with 159 additions and 2 deletions
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include/nuttx/streams.h
+28
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@@ -217,6 +217,14 @@ struct lib_rawsostream_s
int fd;
};
struct lib_bufferedoutstream_s
{
struct lib_outstream_s public;
FAR struct lib_outstream_s *backend;
int pending;
char buffer[CONFIG_STREAM_OUT_BUFFER_SIZE];
};
/* This is a special stream that does buffered character I/O. NOTE that is
* CONFIG_SYSLOG_BUFFER is not defined, it is the same as struct
* lib_outstream_s
@@ -372,6 +380,26 @@ void lib_rawoutstream(FAR struct lib_rawoutstream_s *outstream, int fd);
void lib_rawsistream(FAR struct lib_rawsistream_s *instream, int fd);
void lib_rawsostream(FAR struct lib_rawsostream_s *outstream, int fd);
/****************************************************************************
* Name: lib_bufferedoutstream
*
* Description:
* Wrap a raw output stream to a buffered output stream.
*
* Input Parameters:
* outstream - User allocated, uninitialized instance of struct
* lib_bufferedoutstream_s to be initialized.
* backend - User allocated, initialized instance of struct
* lib_outstream_s to be buffered.
*
* Returned Value:
* None (User allocated instance initialized).
*
****************************************************************************/
void lib_bufferedoutstream(FAR struct lib_bufferedoutstream_s *outstream,
FAR struct lib_outstream_s *backend);
/****************************************************************************
* Name: lib_lowoutstream
*