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Diffstat (limited to 'nuttx/lib/stdio/lib_libfread.c')
-rw-r--r--nuttx/lib/stdio/lib_libfread.c315
1 files changed, 0 insertions, 315 deletions
diff --git a/nuttx/lib/stdio/lib_libfread.c b/nuttx/lib/stdio/lib_libfread.c
deleted file mode 100644
index 5585acbae..000000000
--- a/nuttx/lib/stdio/lib_libfread.c
+++ /dev/null
@@ -1,315 +0,0 @@
-/****************************************************************************
- * lib/stdio/lib_libfread.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 <nuttx/config.h> /* for CONFIG_STDIO_BUFFER_SIZE */
-
-#include <sys/types.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <string.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_fread
- ****************************************************************************/
-
-ssize_t lib_fread(FAR void *ptr, size_t count, FAR FILE *stream)
-{
- unsigned char *dest = (unsigned char*)ptr;
- ssize_t bytes_read;
- int ret;
-
- /* Make sure that reading from this stream is allowed */
-
- if (!stream || (stream->fs_oflags & O_RDOK) == 0)
- {
- set_errno(EBADF);
- bytes_read = -1;
- }
- else
- {
- /* The stream must be stable until we complete the read */
-
- lib_take_semaphore(stream);
-
-#if CONFIG_NUNGET_CHARS > 0
- /* First, re-read any previously ungotten characters */
-
- while ((stream->fs_nungotten > 0) && (count > 0))
- {
- /* Decrement the count of ungotten bytes to get an index */
-
- stream->fs_nungotten--;
-
- /* Return the last ungotten byte */
-
- *dest++ = stream->fs_ungotten[stream->fs_nungotten];
-
- /* That's one less byte that we have to read */
-
- count--;
- }
-#endif
-
-#if CONFIG_STDIO_BUFFER_SIZE > 0
- /* If the buffer is currently being used for write access, then
- * flush all of the buffered write data. We do not support concurrent
- * buffered read/write access.
- */
-
- ret = lib_wrflush(stream);
- if (ret < 0)
- {
- lib_give_semaphore(stream);
- return ret;
- }
-
- /* Now get any other needed chars from the buffer or the file. */
-
- while (count > 0)
- {
- /* Is there readable data in the buffer? */
-
- while ((count > 0) && (stream->fs_bufpos < stream->fs_bufread))
- {
- /* Yes, copy a byte into the user buffer */
-
- *dest++ = *stream->fs_bufpos++;
- count--;
- }
-
- /* The buffer is empty OR we have already supplied the number of
- * bytes requested in the read. Check if we need to read
- * more from the file.
- */
-
- if (count > 0)
- {
- size_t buffer_available;
-
- /* We need to read more data into the buffer from the file */
-
- /* Mark the buffer empty */
-
- stream->fs_bufpos = stream->fs_bufread = stream->fs_bufstart;
-
- /* How much space is available in the buffer? */
-
- buffer_available = stream->fs_bufend - stream->fs_bufread;
-
- /* Will the number of bytes that we need to read fit into
- * the buffer space that is available? If the read size is
- * larger than the buffer, then read some of the data
- * directly into the user's buffer.
- */
-
- if (count > buffer_available)
- {
- bytes_read = read(stream->fs_filedes, dest, count);
- if (bytes_read < 0)
- {
- /* An error occurred on the read. The error code is
- * in the 'errno' variable.
- */
-
- goto errout_with_errno;
- }
- else if (bytes_read == 0)
- {
- /* We are at the end of the file. But we may already
- * have buffered data. In that case, we will report
- * the EOF indication later.
- */
-
- goto shortread;
- }
- else
- {
- /* Some bytes were read. Adjust the dest pointer */
-
- dest += bytes_read;
-
- /* Were all of the requested bytes read? */
-
- if (bytes_read < count)
- {
- /* No. We must be at the end of file. */
-
- goto shortread;
- }
- else
- {
- /* Yes. We are done. */
-
- count = 0;
- }
- }
- }
- else
- {
- /* The number of bytes required to satisfy the read
- * is less than or equal to the size of the buffer
- * space that we have left. Read as much as we can
- * into the buffer.
- */
-
- bytes_read = read(stream->fs_filedes, stream->fs_bufread, buffer_available);
- if (bytes_read < 0)
- {
- /* An error occurred on the read. The error code is
- * in the 'errno' variable.
- */
-
- goto errout_with_errno;
- }
- else if (bytes_read == 0)
- {
- /* We are at the end of the file. But we may already
- * have buffered data. In that case, we will report
- * the EOF indication later.
- */
-
- goto shortread;
- }
- else
- {
- /* Some bytes were read */
-
- stream->fs_bufread += bytes_read;
- }
- }
- }
- }
-#else
- /* Now get any other needed chars from the file. */
-
- while (count > 0)
- {
- bytes_read = read(stream->fs_filedes, dest, count);
- if (bytes_read < 0)
- {
- /* An error occurred on the read. The error code is
- * in the 'errno' variable.
- */
-
- goto errout_with_errno;
- }
- else if (bytes_read == 0)
- {
- /* We are at the end of the file. But we may already
- * have buffered data. In that case, we will report
- * the EOF indication later.
- */
-
- break;
- }
- else
- {
- dest += bytes_read;
- count -= bytes_read;
- }
- }
-#endif
- /* Here after a successful (but perhaps short) read */
-
-#if CONFIG_STDIO_BUFFER_SIZE > 0
- shortread:
-#endif
- bytes_read = dest - (unsigned char*)ptr;
-
- /* Set or clear the EOF indicator. If we get here because of a
- * short read and the total number of* bytes read is zero, then
- * we must be at the end-of-file.
- */
-
- if (bytes_read > 0)
- {
- stream->fs_flags &= ~__FS_FLAG_EOF;
- }
- else
- {
- stream->fs_flags |= __FS_FLAG_EOF;
- }
- }
-
- lib_give_semaphore(stream);
- return bytes_read;
-
-/* Error exits */
-
-errout_with_errno:
- lib_give_semaphore(stream);
- return -get_errno();
-}
-
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