122 lines
4.5 KiB
C
122 lines
4.5 KiB
C
/****************************************************************************
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* lib_ungetc.c
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*
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* Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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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* Compilation Switches
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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 <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <nuttx/fs.h>
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#include "lib_internal.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Global Function Prototypes
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****************************************************************************/
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/**************************************************************************
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* Global Constant Data
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**************************************************************************/
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/****************************************************************************
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* Global Variables
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****************************************************************************/
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/**************************************************************************
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* Private Constant Data
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**************************************************************************/
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/****************************************************************************
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* Private Variables
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**************************************************************************/
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/****************************************************************************
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* Global Functions
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**************************************************************************/
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/****************************************************************************
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* Name: ungetc
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**************************************************************************/
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int ungetc(int c, FILE *stream)
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{
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#if CONFIG_NUNGET_CHARS > 0
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int nungotten;
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#endif
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/* Stream must be open for read access */
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if ((stream && stream->fs_filedes < 0) ||
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((stream->fs_oflags & O_RDOK) == 0))
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{
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errno = EBADF;
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return EOF;
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}
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#if CONFIG_NUNGET_CHARS > 0
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nungotten = stream->fs_nungotten;
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if (stream->fs_nungotten < CONFIG_NUNGET_CHARS)
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{
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stream->fs_ungotten[nungotten] = c;
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stream->fs_nungotten = nungotten + 1;
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return c;
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}
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else
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#endif
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{
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errno = ENOMEM;
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return EOF;
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}
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}
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