libc/stdio/stdio_ext.cpp

/*
 * Copyright (C) 2014 The Android Open Source Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * 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.
 *
 * 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.
 */

#include <stdio_ext.h>

#include <stdio.h>
#include "local.h"

#define FSETLOCKING_QUERY 0
#define FSETLOCKING_INTERNAL 1
#define FSETLOCKING_BYCALLER 2

size_t __fbufsize(FILE* fp) {
  return fp->_bf._size;
}

/* For a _SRW stream, we don't know whether we last read or wrote.
int __freading(FILE* fp) {
  return (fp->_flags & _SRD) != 0 || ...;
}
*/

/* For a _SRW stream, we don't know whether we last read or wrote.
int __fwriting(FILE*) {
  return (fp->_flags & _SWR) != 0 || ...;
}
*/

int __freadable(FILE* fp) {
  return (fp->_flags & (__SRD|__SRW)) != 0;
}

int __fwritable(FILE* fp) {
  return (fp->_flags & (__SWR|__SRW)) != 0;
}

int __flbf(FILE* fp) {
  return (fp->_flags & __SLBF) != 0;
}

void __fpurge(FILE* fp) {
  fpurge(fp);
}

size_t __fpending(FILE* fp) {
  return fp->_p - fp->_bf._base;
}

void _flushlbf() {
  // If we flush all streams, we know we've flushed all the line-buffered streams.
  fflush(NULL);
}

int __fsetlocking(FILE*, int) {
  // We don't currently have an implementation that would obey this,
  // so make setting the state a no-op and always return "we handle locking for you".
  // http://b/17154740 suggests ways we could fix this.
  return FSETLOCKING_INTERNAL;
}

void clearerr_unlocked(FILE* fp) {
  return __sclearerr(fp);
}

int feof_unlocked(FILE* fp) {
  return __sfeof(fp);
}

int ferror_unlocked(FILE* fp) {
  return __sferror(fp);
}