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Add seekable standard streams

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This commit is contained in:
Gregory Nutt
2014-06-14 16:19:42 -06:00
parent 0a331754f7
commit 038f10ed55
6 changed files with 330 additions and 54 deletions
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libc/stdio/lib_stdoutstream.c
+12 -14
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@@ -1,7 +1,7 @@
/****************************************************************************
* libc/stdio/lib_stdoutstream.c
*
* Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2011-2012, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -101,22 +101,22 @@ static int stdoutstream_flush(FAR struct lib_outstream_s *this)
* Initializes a stream for use with a FILE instance.
*
* Input parameters:
* stdoutstream - User allocated, uninitialized instance of struct
* lib_stdoutstream_s to be initialized.
* stream - User provided stream instance (must have been opened for
* write access).
* outstream - User allocated, uninitialized instance of struct
* lib_stdoutstream_s to be initialized.
* stream - User provided stream instance (must have been opened for
* write access).
*
* Returned Value:
* None (User allocated instance initialized).
*
****************************************************************************/
void lib_stdoutstream(FAR struct lib_stdoutstream_s *stdoutstream,
FAR FILE *stream)
void lib_stdoutstream(FAR struct lib_stdoutstream_s *outstream,
FAR FILE *stream)
{
/* Select the put operation */
stdoutstream->public.put = stdoutstream_putc;
outstream->public.put = stdoutstream_putc;
/* Select the correct flush operation. This flush is only called when
* a newline is encountered in the output stream. However, we do not
@@ -129,19 +129,17 @@ void lib_stdoutstream(FAR struct lib_stdoutstream_s *stdoutstream,
#if CONFIG_STDIO_BUFFER_SIZE > 0
if ((stream->fs_oflags & O_BINARY) == 0)
{
stdoutstream->public.flush = stdoutstream_flush;
outstream->public.flush = stdoutstream_flush;
}
else
#endif
{
stdoutstream->public.flush = lib_noflush;
outstream->public.flush = lib_noflush;
}
#endif
/* Set the number of bytes put to zero and remember the stream */
stdoutstream->public.nput = 0;
stdoutstream->stream = stream;
outstream->public.nput = 0;
outstream->stream = stream;
}