1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <stdio_ext.h>
30
31#include <errno.h>
32#include <stdlib.h>
33
34#include "local.h"
35#include "private/libc_logging.h"
36
37size_t __fbufsize(FILE* fp) {
38  return fp->_bf._size;
39}
40
41/* For a _SRW stream, we don't know whether we last read or wrote.
42int __freading(FILE* fp) {
43  return (fp->_flags & _SRD) != 0 || ...;
44}
45*/
46
47/* For a _SRW stream, we don't know whether we last read or wrote.
48int __fwriting(FILE*) {
49  return (fp->_flags & _SWR) != 0 || ...;
50}
51*/
52
53int __freadable(FILE* fp) {
54  return (fp->_flags & (__SRD|__SRW)) != 0;
55}
56
57int __fwritable(FILE* fp) {
58  return (fp->_flags & (__SWR|__SRW)) != 0;
59}
60
61int __flbf(FILE* fp) {
62  return (fp->_flags & __SLBF) != 0;
63}
64
65void __fpurge(FILE* fp) {
66  fpurge(fp);
67}
68
69size_t __fpending(FILE* fp) {
70  return fp->_p - fp->_bf._base;
71}
72
73void _flushlbf() {
74  // If we flush all streams, we know we've flushed all the line-buffered streams.
75  fflush(NULL);
76}
77
78int __fsetlocking(FILE* fp, int type) {
79  int old_state = _EXT(fp)->_caller_handles_locking ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
80  if (type == FSETLOCKING_QUERY) {
81    return old_state;
82  }
83
84  if (type != FSETLOCKING_INTERNAL && type != FSETLOCKING_BYCALLER) {
85    // The API doesn't let us report an error, so blow up.
86    __libc_fatal("Bad type (%d) passed to __fsetlocking", type);
87  }
88
89  _EXT(fp)->_caller_handles_locking = (type == FSETLOCKING_BYCALLER);
90  return old_state;
91}
92
93void clearerr_unlocked(FILE* fp) {
94  return __sclearerr(fp);
95}
96
97int feof_unlocked(FILE* fp) {
98  return __sfeof(fp);
99}
100
101int ferror_unlocked(FILE* fp) {
102  return __sferror(fp);
103}
104
105int fileno_unlocked(FILE* fp) {
106  int fd = fp->_file;
107  if (fd == -1) {
108    errno = EBADF;
109    return -1;
110  }
111  return fd;
112}
113