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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SEQ_BUF_H
3 #define _LINUX_SEQ_BUF_H
8 * Trace sequences are used to allow a function to call several other functions
9 * to create a string of data to use.
13 * seq_buf - seq buffer structure
14 * @buffer: pointer to the buffer
15 * @size: size of the buffer
16 * @len: the amount of data inside the buffer
17 * @readpos: The next position to read in the buffer.
26 static inline void seq_buf_clear(struct seq_buf
*s
)
33 seq_buf_init(struct seq_buf
*s
, unsigned char *buf
, unsigned int size
)
41 * seq_buf have a buffer that might overflow. When this happens
42 * the len and size are set to be equal.
45 seq_buf_has_overflowed(struct seq_buf
*s
)
47 return s
->len
> s
->size
;
51 seq_buf_set_overflow(struct seq_buf
*s
)
57 * How much buffer is left on the seq_buf?
59 static inline unsigned int
60 seq_buf_buffer_left(struct seq_buf
*s
)
62 if (seq_buf_has_overflowed(s
))
65 return s
->size
- s
->len
;
68 /* How much buffer was written? */
69 static inline unsigned int seq_buf_used(struct seq_buf
*s
)
71 return min(s
->len
, s
->size
);
75 * seq_buf_get_buf - get buffer to write arbitrary data to
76 * @s: the seq_buf handle
77 * @bufp: the beginning of the buffer is stored here
79 * Return the number of bytes available in the buffer, or zero if
82 static inline size_t seq_buf_get_buf(struct seq_buf
*s
, char **bufp
)
84 WARN_ON(s
->len
> s
->size
+ 1);
86 if (s
->len
< s
->size
) {
87 *bufp
= s
->buffer
+ s
->len
;
88 return s
->size
- s
->len
;
96 * seq_buf_commit - commit data to the buffer
97 * @s: the seq_buf handle
98 * @num: the number of bytes to commit
100 * Commit @num bytes of data written to a buffer previously acquired
101 * by seq_buf_get. To signal an error condition, or that the data
102 * didn't fit in the available space, pass a negative @num value.
104 static inline void seq_buf_commit(struct seq_buf
*s
, int num
)
107 seq_buf_set_overflow(s
);
109 /* num must be negative on overflow */
110 BUG_ON(s
->len
+ num
> s
->size
);
115 extern __printf(2, 3)
116 int seq_buf_printf(struct seq_buf
*s
, const char *fmt
, ...);
117 extern __printf(2, 0)
118 int seq_buf_vprintf(struct seq_buf
*s
, const char *fmt
, va_list args
);
119 extern int seq_buf_print_seq(struct seq_file
*m
, struct seq_buf
*s
);
120 extern int seq_buf_to_user(struct seq_buf
*s
, char __user
*ubuf
,
122 extern int seq_buf_puts(struct seq_buf
*s
, const char *str
);
123 extern int seq_buf_putc(struct seq_buf
*s
, unsigned char c
);
124 extern int seq_buf_putmem(struct seq_buf
*s
, const void *mem
, unsigned int len
);
125 extern int seq_buf_putmem_hex(struct seq_buf
*s
, const void *mem
,
127 extern int seq_buf_path(struct seq_buf
*s
, const struct path
*path
, const char *esc
);
128 extern int seq_buf_hex_dump(struct seq_buf
*s
, const char *prefix_str
,
129 int prefix_type
, int rowsize
, int groupsize
,
130 const void *buf
, size_t len
, bool ascii
);
132 #ifdef CONFIG_BINARY_PRINTF
134 seq_buf_bprintf(struct seq_buf
*s
, const char *fmt
, const u32
*binary
);
137 #endif /* _LINUX_SEQ_BUF_H */