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 <async_safe/log.h>
35
36 #include "local.h"
37
__fbufsize(FILE * fp)38 size_t __fbufsize(FILE* fp) {
39 return fp->_bf._size;
40 }
41
__freading(FILE * fp)42 int __freading(FILE* fp) {
43 return (fp->_flags & __SRD) != 0;
44 }
45
__fwriting(FILE * fp)46 int __fwriting(FILE* fp) {
47 return (fp->_flags & __SWR) != 0;
48 }
49
__freadable(FILE * fp)50 int __freadable(FILE* fp) {
51 return (fp->_flags & (__SRD|__SRW)) != 0;
52 }
53
__fwritable(FILE * fp)54 int __fwritable(FILE* fp) {
55 return (fp->_flags & (__SWR|__SRW)) != 0;
56 }
57
__flbf(FILE * fp)58 int __flbf(FILE* fp) {
59 return (fp->_flags & __SLBF) != 0;
60 }
61
__fpurge(FILE * fp)62 void __fpurge(FILE* fp) {
63 fpurge(fp);
64 }
65
__fpending(FILE * fp)66 size_t __fpending(FILE* fp) {
67 return fp->_p - fp->_bf._base;
68 }
69
__freadahead(FILE * fp)70 size_t __freadahead(FILE* fp) {
71 // Normally _r is the amount of input already available.
72 // When there's ungetc() data, _r counts that and _ur is the previous _r.
73 return fp->_r + (HASUB(fp) ? fp->_ur : 0);
74 }
75
_flushlbf()76 void _flushlbf() {
77 // If we flush all streams, we know we've flushed all the line-buffered streams.
78 fflush(nullptr);
79 }
80
__fseterr(FILE * fp)81 void __fseterr(FILE* fp) {
82 fp->_flags |= __SERR;
83 }
84
__fsetlocking(FILE * fp,int type)85 int __fsetlocking(FILE* fp, int type) {
86 int old_state = _EXT(fp)->_caller_handles_locking ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
87 if (type == FSETLOCKING_QUERY) {
88 return old_state;
89 }
90
91 if (type != FSETLOCKING_INTERNAL && type != FSETLOCKING_BYCALLER) {
92 // The API doesn't let us report an error, so blow up.
93 async_safe_fatal("Bad type (%d) passed to __fsetlocking", type);
94 }
95
96 _EXT(fp)->_caller_handles_locking = (type == FSETLOCKING_BYCALLER);
97 return old_state;
98 }
99