1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2016-2018, Matthew Macy <mmacy@freebsd.org>
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  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  * $FreeBSD$
28  */
29 
30 #ifndef _LINUX_SEQ_FILE_H_
31 #define _LINUX_SEQ_FILE_H_
32 
33 #include <linux/types.h>
34 #include <linux/fs.h>
35 #include <sys/sbuf.h>
36 
37 #undef file
38 #define inode vnode
39 
40 #define	DEFINE_SHOW_ATTRIBUTE(__name)					\
41 static int __name ## _open(struct inode *inode, struct linux_file *file)	\
42 {									\
43 	return single_open(file, __name ## _show, inode->i_private);	\
44 }									\
45 									\
46 static const struct file_operations __name ## _fops = {			\
47 	.owner		= THIS_MODULE,					\
48 	.open		= __name ## _open,				\
49 	.read		= seq_read,					\
50 	.llseek		= seq_lseek,					\
51 	.release	= single_release,				\
52 }
53 
54 struct seq_operations;
55 
56 struct seq_file {
57 	struct sbuf	*buf;
58 
59 	const struct seq_operations *op;
60 	const struct linux_file *file;
61 	void *private;
62 };
63 
64 struct seq_operations {
65 	void * (*start) (struct seq_file *m, off_t *pos);
66 	void (*stop) (struct seq_file *m, void *v);
67 	void * (*next) (struct seq_file *m, void *v, off_t *pos);
68 	int (*show) (struct seq_file *m, void *v);
69 };
70 
71 ssize_t seq_read(struct linux_file *, char *, size_t, off_t *);
72 int seq_write(struct seq_file *seq, const void *data, size_t len);
73 
74 int seq_open(struct linux_file *f, const struct seq_operations *op);
75 int seq_release(struct inode *inode, struct linux_file *file);
76 
77 off_t seq_lseek(struct linux_file *file, off_t offset, int whence);
78 int single_open(struct linux_file *, int (*)(struct seq_file *, void *), void *);
79 int single_release(struct inode *, struct linux_file *);
80 
81 #define seq_printf(m, fmt, ...) sbuf_printf((m)->buf, (fmt), ##__VA_ARGS__)
82 
83 #define seq_puts(m, str)	sbuf_printf((m)->buf, str)
84 #define seq_putc(m, str)	sbuf_putc((m)->buf, str)
85 
86 #define	file			linux_file
87 
88 #endif	/* _LINUX_SEQ_FILE_H_ */
89