cf99fb40c9
Squashed commit of the following:
libs/libxx: Fix some confusing in naming. If the directory is called libxx, then the library must be libxx.a (unless perhaps LIBCXX is selected).
libs/: Fix paths in moved library directories.
libs: Brute force move of libc, libnx, and libxx to libs. Cannot yet build it in that configuration.
131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_ftell.c
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*
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* Copyright (C) 2008, 2011, 2013, 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "libc.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lib_getrdoffset
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*
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* Description:
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* It is insufficient to simply use the file offset; we must also account
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* for the data offset in the any buffered data. This function calculates
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* that offset.
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*
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* Returned Value:
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* The file position offset due to buffered data.
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*
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****************************************************************************/
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#ifndef CONFIG_STDIO_DISABLE_BUFFERING
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static off_t lib_getrdoffset(FAR FILE *stream)
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{
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off_t rdoffset = 0;
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lib_take_semaphore(stream);
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if (stream->fs_bufstart != NULL && stream->fs_bufread != stream->fs_bufstart)
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{
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#if CONFIG_NUNGET_CHARS > 0
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rdoffset = stream->fs_bufread - stream->fs_bufpos + stream->fs_nungotten;
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#else
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rdoffset = stream->fs_bufread - stream->fs_bufpos;
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#endif
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}
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lib_give_semaphore(stream);
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return rdoffset;
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}
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#else
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# define lib_getrdoffset(stream) (0)
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ftell
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*
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* Description:
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* ftell() returns the current value of the file position indicator for the
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* stream pointed to by stream.
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*
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* Returned Value:
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* Zero on success; -1 on failure with errno set appropriately.
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*
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****************************************************************************/
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long ftell(FAR FILE *stream)
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{
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off_t position;
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/* Verify that we were provided with a stream */
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if (!stream)
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{
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set_errno(EBADF);
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return ERROR;
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}
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/* Perform the lseek to the current position. This will not move the
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* file pointer, but will return its current setting
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*/
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position = lseek(stream->fs_fd, 0, SEEK_CUR);
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if (position != (off_t)-1)
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{
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return (long)(position - lib_getrdoffset(stream));
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}
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else
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{
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return ERROR;
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}
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}
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