include/stdio_ext.h

/****************************************************************************
 * include/stdio_ext.h
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

#ifndef __INCLUDE_STDIO_EXT_H
#define __INCLUDE_STDIO_EXT_H

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <stdio.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/* Values for __fsetlocking() */

#define FSETLOCKING_QUERY    0  /* Only return the current mode */
#define FSETLOCKING_INTERNAL 1  /* The library locks the stream */
#define FSETLOCKING_BYCALLER 2  /* The caller locks the stream */

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

/* These functions give access to the state of a stream.  glibc and musl
 * provide them, and portable code (gnulib, for example) uses them instead
 * of looking inside FILE.
 */

#ifdef __cplusplus
extern "C"
{
#endif

size_t __fbufsize(FAR FILE *stream);
size_t __fpending(FAR FILE *stream);
int    __freading(FAR FILE *stream);
int    __fwriting(FAR FILE *stream);
int    __freadable(FAR FILE *stream);
int    __fwritable(FAR FILE *stream);
int    __flbf(FAR FILE *stream);
void   __fpurge(FAR FILE *stream);
size_t __freadahead(FAR FILE *stream);
FAR const char *__freadptr(FAR FILE *stream, FAR size_t *sizep);
void   __freadptrinc(FAR FILE *stream, size_t inc);
void   __fseterr(FAR FILE *stream);
int    __fsetlocking(FAR FILE *stream, int type);
void   _flushlbf(void);

#ifdef __cplusplus
}
#endif

#endif /* __INCLUDE_STDIO_EXT_H */