diff options
Diffstat (limited to 'nuttx/libc/stdio/lib_libfflush.c')
| -rw-r--r-- | nuttx/libc/stdio/lib_libfflush.c | 202 |
1 files changed, 0 insertions, 202 deletions
diff --git a/nuttx/libc/stdio/lib_libfflush.c b/nuttx/libc/stdio/lib_libfflush.c deleted file mode 100644 index f2f0cfe14..000000000 --- a/nuttx/libc/stdio/lib_libfflush.c +++ /dev/null @@ -1,202 +0,0 @@ -/**************************************************************************** - * libc/stdio/lib_libfflush.c - * - * Copyright (C) 2007-2008, 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. - * - ****************************************************************************/ - -/**************************************************************************** - * Compilation Switches - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <sys/types.h> -#include <stdbool.h> -#include <unistd.h> -#include <fcntl.h> -#include <errno.h> - -#include <nuttx/fs/fs.h> - -#include "lib_internal.h" - -/**************************************************************************** - * Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Type Declarations - ****************************************************************************/ - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ - -/**************************************************************************** - * Global Constant Data - ****************************************************************************/ - -/**************************************************************************** - * Global Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Constant Data - ****************************************************************************/ - -/**************************************************************************** - * Private Variables - ****************************************************************************/ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: lib_fflush - * - * Description: - * The function lib_fflush() forces a write of all user-space buffered data for - * the given output or update stream via the stream's underlying write - * function. The open status of the stream is unaffected. - * - * Parmeters: - * stream - the stream to flush - * bforce - flush must be complete. - * - * Return: - * A negated errno value on failure, otherwise the number of bytes remaining - * in the buffer. - * - ****************************************************************************/ - -ssize_t lib_fflush(FAR FILE *stream, bool bforce) -{ -#if CONFIG_STDIO_BUFFER_SIZE > 0 - FAR const unsigned char *src; - ssize_t bytes_written; - ssize_t nbuffer; - - /* Return EBADF if the file is not opened for writing */ - - if (stream->fs_filedes < 0 || (stream->fs_oflags & O_WROK) == 0) - { - return -EBADF; - } - - /* Make sure that we have exclusive access to the stream */ - - lib_take_semaphore(stream); - - /* Make sure that the buffer holds valid data */ - - if (stream->fs_bufpos != stream->fs_bufstart) - { - /* Make sure that the buffer holds buffered write data. We do not - * support concurrent read/write buffer usage. - */ - - if (stream->fs_bufread != stream->fs_bufstart) - { - /* The buffer holds read data... just return zero meaning "no bytes - * remaining in the buffer." - */ - - lib_give_semaphore(stream); - return 0; - } - - /* How many bytes of write data are used in the buffer now */ - - nbuffer = stream->fs_bufpos - stream->fs_bufstart; - - /* Try to write that amount */ - - src = stream->fs_bufstart; - do - { - /* Perform the write */ - - bytes_written = write(stream->fs_filedes, src, nbuffer); - if (bytes_written < 0) - { - /* Write failed. The cause of the failure is in 'errno'. - * returned the negated errno value. - */ - - lib_give_semaphore(stream); - return -get_errno(); - } - - /* Handle partial writes. fflush() must either return with - * an error condition or with the data successfully flushed - * from the buffer. - */ - - src += bytes_written; - nbuffer -= bytes_written; - } - while (bforce && nbuffer > 0); - - /* Reset the buffer position to the beginning of the buffer */ - - stream->fs_bufpos = stream->fs_bufstart; - - /* For the case of an incomplete write, nbuffer will be non-zero - * It will hold the number of bytes that were not written. - * Move the data down in the buffer to handle this (rare) case - */ - - while (nbuffer) - { - *stream->fs_bufpos++ = *src++; - --nbuffer; - } - } - - /* Restore normal access to the stream and return the number of bytes - * remaining in the buffer. - */ - - lib_give_semaphore(stream); - return stream->fs_bufpos - stream->fs_bufstart; -#else - /* Return no bytes remaining in the buffer */ - - return 0; -#endif -} - |