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/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2022 Keith Packard
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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 HOLDER 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.
*/
#ifndef _STDIO_BUFIO_H_
#define _STDIO_BUFIO_H_
#include <stdio.h>
#include <sys/types.h>
#include <sys/lock.h>
#define __BALL 0x0001 /* bufio buf is allocated by stdio */
#define __BLBF 0x0002 /* bufio is line buffered */
#define __BFALL 0x0004 /* FILE is allocated by stdio */
#define __BFPTR 0x0008 /* funcs need pointers instead of ints */
union __file_bufio_cookie {
int fd;
void *ptr;
};
#if !defined(__SINGLE_THREAD) && !defined(__STDIO_LOCKING)
#define __STDIO_BUFIO_LOCKING
#endif
struct __file_bufio {
struct __file_ext xfile;
const void *ptr;
uint8_t dir;
uint8_t bflags;
__off_t pos; /* FD position */
char *buf;
int size; /* sizeof buf */
int len; /* valid data in buf */
int off; /* offset of data in buf */
union {
ssize_t (*read_int)(int fd, void *buf, size_t count);
ssize_t (*read_ptr)(void *ptr, void *buf, size_t count);
};
union {
ssize_t (*write_int)(int fd, const void *buf, size_t count);
ssize_t (*write_ptr)(void *ptr, const void *buf, size_t count);
};
union {
__off_t (*lseek_int)(int fd, __off_t offset, int whence);
__off_t (*lseek_ptr)(void *ptr, __off_t offset, int whence);
};
union {
int (*close_int)(int fd);
int (*close_ptr)(void *ptr);
};
#ifdef __STDIO_BUFIO_LOCKING
_LOCK_T lock;
#endif
};
#define FDEV_SETUP_BUFIO(_fd, _buf, _size, _read, _write, _lseek, _close, _rwflag, _bflags) \
{ \
.xfile = FDEV_SETUP_EXT(__bufio_put, __bufio_get, __bufio_flush, \
(_bflags) & (__BALL | __BFALL) ? __bufio_close : __bufio_close_nf, \
__bufio_seek, NULL, (_rwflag) | __SBUF), \
.ptr = (void *)(intptr_t)(_fd), .dir = 0, .bflags = (_bflags), .pos = 0, .buf = _buf, \
.size = _size, .len = 0, .off = 0, { .read_int = _read }, { .write_int = _write }, \
{ .lseek_int = _lseek }, \
{ \
.close_int = _close \
} \
}
#define FDEV_SETUP_BUFIO_PTR(_ptr, _buf, _size, _read, _write, _lseek, _close, _rwflag, _bflags) \
{ \
.xfile = FDEV_SETUP_EXT(__bufio_put, __bufio_get, __bufio_flush, \
(_bflags) & (__BALL | __BFALL) ? __bufio_close : __bufio_close_nf, \
__bufio_seek, NULL, (_rwflag) | __SBUF), \
.ptr = _ptr, .dir = 0, .bflags = (_bflags) | __BFPTR, .pos = 0, .buf = _buf, \
.size = _size, .len = 0, .off = 0, { .read_ptr = _read }, { .write_ptr = _write }, \
{ .lseek_ptr = _lseek }, \
{ \
.close_ptr = _close \
} \
}
#ifdef __STDIO_BUFIO_LOCKING
void __bufio_lock_init(FILE *f);
#endif
static inline void
__bufio_lock_close(FILE *f)
{
#ifdef __STDIO_BUFIO_LOCKING
struct __file_bufio *bf = (struct __file_bufio *)f;
if (bf->lock) {
__lock_release(bf->lock);
__lock_close(bf->lock);
}
#endif
(void)f;
}
static inline void
__bufio_lock(FILE *f)
{
#ifdef __STDIO_BUFIO_LOCKING
struct __file_bufio *bf = (struct __file_bufio *)f;
if (!bf->lock)
__lock_init(bf->lock);
__lock_acquire(bf->lock);
#endif
(void)f;
}
static inline void
__bufio_unlock(FILE *f)
{
(void)f;
#ifdef __STDIO_BUFIO_LOCKING
struct __file_bufio *bf = (struct __file_bufio *)f;
__lock_release(bf->lock);
#endif
}
int __bufio_flush_locked(FILE *f);
int __bufio_fill_locked(FILE *f);
int __bufio_setdir_locked(FILE *f, uint8_t dir);
int __bufio_flush(FILE *f);
int __bufio_put(char c, FILE *f);
int __bufio_get(FILE *f);
off_t __bufio_seek(FILE *f, off_t offset, int whence);
int __bufio_setvbuf(FILE *f, char *buf, int mode, size_t size);
int __bufio_close(FILE *f);
int __bufio_close_nf(FILE *f);
#endif /* _STDIO_BUFIO_H_ */
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