1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2022 Keith Packard
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #ifndef _STDIO_BUFIO_H_
37 #define _STDIO_BUFIO_H_
38
39 #include <stdio.h>
40 #include <sys/types.h>
41 #include <sys/lock.h>
42
43 #define __BALL 0x0001 /* bufio buf is allocated by stdio */
44 #define __BLBF 0x0002 /* bufio is line buffered */
45
46 struct __file_bufio {
47 struct __file_ext xfile;
48 int fd;
49 uint8_t dir;
50 uint8_t bflags;
51 __off_t pos; /* FD position */
52 char *buf;
53 int size; /* sizeof buf */
54 int len; /* valid data in buf */
55 int off; /* offset of data in buf */
56 ssize_t (*read)(int fd, void *buf, size_t count);
57 ssize_t (*write)(int fd, const void *buf, size_t count);
58 __off_t (*lseek)(int fd, __off_t offset, int whence);
59 int (*close)(int fd);
60 #ifndef __SINGLE_THREAD__
61 _LOCK_T lock;
62 #endif
63 };
64
65 #define FDEV_SETUP_BUFIO(_fd, _buf, _size, _read, _write, _lseek, _close, _rwflag, _bflags) \
66 { \
67 .xfile = FDEV_SETUP_EXT(__bufio_put, __bufio_get, \
68 __bufio_flush, __bufio_close, \
69 __bufio_seek, __bufio_setvbuf, \
70 (_rwflag) | __SBUF), \
71 .fd = _fd, \
72 .dir = 0, \
73 .bflags = (_bflags), \
74 .pos = 0, \
75 .buf = _buf, \
76 .size = _size, \
77 .len = 0, \
78 .off = 0, \
79 .read = _read, \
80 .write = _write, \
81 .lseek = _lseek, \
82 .close = _close, \
83 }
84
__bufio_lock_init(FILE * f)85 static inline void __bufio_lock_init(FILE *f) {
86 (void) f;
87 __lock_init(((struct __file_bufio *) f)->lock);
88 }
89
__bufio_lock_close(FILE * f)90 static inline void __bufio_lock_close(FILE *f) {
91 (void) f;
92 __lock_release(((struct __file_bufio *) f)->lock);
93 __lock_close(((struct __file_bufio *) f)->lock);
94 }
95
__bufio_lock(FILE * f)96 static inline void __bufio_lock(FILE *f) {
97 (void) f;
98 __lock_acquire(((struct __file_bufio *) f)->lock);
99 }
100
__bufio_unlock(FILE * f)101 static inline void __bufio_unlock(FILE *f) {
102 (void) f;
103 __lock_release(((struct __file_bufio *) f)->lock);
104 }
105
106 int
107 __bufio_flush(FILE *f);
108
109 int
110 __bufio_put(char c, FILE *f);
111
112 int
113 __bufio_get(FILE *f);
114
115 off_t
116 __bufio_seek(FILE *f, off_t offset, int whence);
117
118 int
119 __bufio_setvbuf(FILE *f, char *buf, int mode, size_t size);
120
121 int
122 __bufio_close(FILE *f);
123
124 #endif /* _STDIO_BUFIO_H_ */
125
