diff options
Diffstat (limited to 'nuttx/libc/stdio/lib_wrflush.c')
-rw-r--r-- | nuttx/libc/stdio/lib_wrflush.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/nuttx/libc/stdio/lib_wrflush.c b/nuttx/libc/stdio/lib_wrflush.c new file mode 100644 index 000000000..39680da6a --- /dev/null +++ b/nuttx/libc/stdio/lib_wrflush.c @@ -0,0 +1,134 @@ +/**************************************************************************** + * lib/stdio/lib_wrflush.c + * + * Copyright (C) 2008-2009, 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 <nuttx/config.h> + +#include <stdbool.h> +#include <fcntl.h> +#include <errno.h> + +#include "lib_internal.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Type Declarations + ****************************************************************************/ + +/**************************************************************************** + * Private Function Prototypes + ****************************************************************************/ + +/**************************************************************************** + * Global Constant Data + ****************************************************************************/ + +/**************************************************************************** + * Global Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Constant Data + ****************************************************************************/ + +/**************************************************************************** + * Private Variables + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: lib_wrflush + * + * Description: + * This is simply a version of fflush that does not report an error if + * the file is not open for writing. + * + ****************************************************************************/ + +int lib_wrflush(FAR FILE *stream) +{ +#if CONFIG_STDIO_BUFFER_SIZE > 0 + /* Verify that we were passed a valid (i.e., non-NULL) stream */ + +#ifdef CONFIG_DEBUG + if (!stream) + { + return -EINVAL; + } +#endif + + /* Verify that the stream is opened for writing... lib_fflush will + * return an error if it is called for a stream that is not opened for + * writing. Check that first so that this function will not fail in + * that case. + */ + + if ((stream->fs_oflags & O_WROK) == 0) + { + /* Report that the success was successful if we attempt to flush a + * read-only stream. + */ + + return OK; + } + + /* Flush the stream. Return success if there is no buffered write data + * -- i.e., that the stream is opened for writing and that all of the + * buffered write data was successfully flushed by lib_fflush(). + */ + + return lib_fflush(stream, true); +#else + /* Verify that we were passed a valid (i.e., non-NULL) stream */ + +#ifdef CONFIG_DEBUG + if (!stream) + { + return -EINVAL; + } +#endif + + return OK; +#endif +} |