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Diffstat (limited to 'nuttx/lib/stdio/lib_stdoutstream.c')
-rw-r--r-- | nuttx/lib/stdio/lib_stdoutstream.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/nuttx/lib/stdio/lib_stdoutstream.c b/nuttx/lib/stdio/lib_stdoutstream.c new file mode 100644 index 000000000..20da5b702 --- /dev/null +++ b/nuttx/lib/stdio/lib_stdoutstream.c @@ -0,0 +1,147 @@ +/**************************************************************************** + * lib/stdio/lib_stdoutstream.c + * + * Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <fcntl.h> +#include <assert.h> +#include <errno.h> + +#include "lib_internal.h" + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: stdoutstream_putc + ****************************************************************************/ + +static void stdoutstream_putc(FAR struct lib_outstream_s *this, int ch) +{ + FAR struct lib_stdoutstream_s *sthis = (FAR struct lib_stdoutstream_s *)this; + int result; + + DEBUGASSERT(this && sthis->stream); + + /* Loop until the character is successfully transferred or an irrecoverable + * error occurs. + */ + + do + { + result = fputc(ch, sthis->stream); + if (result != EOF) + { + this->nput++; + return; + } + + /* EINTR (meaning that fputc was interrupted by a signal) is the only + * recoverable error. + */ + } + while (get_errno() == EINTR); +} + +/**************************************************************************** + * Name: stdoutstream_flush + ****************************************************************************/ + +#if defined(CONFIG_STDIO_LINEBUFFER) && CONFIG_STDIO_BUFFER_SIZE > 0 +int stdoutstream_flush(FAR struct lib_outstream_s *this) +{ + FAR struct lib_stdoutstream_s *sthis = (FAR struct lib_stdoutstream_s *)this; + return lib_fflush(sthis->stream, true); +} +#endif + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: lib_stdoutstream + * + * Description: + * 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). + * + * Returned Value: + * None (User allocated instance initialized). + * + ****************************************************************************/ + +void lib_stdoutstream(FAR struct lib_stdoutstream_s *stdoutstream, + FAR FILE *stream) +{ + /* Select the put operation */ + + stdoutstream->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 + * want to support this line buffering behavior if the stream was + * opened in binary mode. In binary mode, the newline has no special + * meaning. + */ + +#ifdef CONFIG_STDIO_LINEBUFFER +#if CONFIG_STDIO_BUFFER_SIZE > 0 + if ((stream->fs_oflags & O_BINARY) == 0) + { + stdoutstream->public.flush = stdoutstream_flush; + } + else +#endif + { + stdoutstream->public.flush = lib_noflush; + } +#endif + + /* Set the number of bytes put to zero and remember the stream */ + + stdoutstream->public.nput = 0; + stdoutstream->stream = stream; +} + + |