134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
#ifndef _LINUX_SEQ_BUF_H
|
|
#define _LINUX_SEQ_BUF_H
|
|
|
|
#include <linux/fs.h>
|
|
|
|
/*
|
|
* Trace sequences are used to allow a function to call several other functions
|
|
* to create a string of data to use.
|
|
*/
|
|
|
|
/**
|
|
* seq_buf - seq buffer structure
|
|
* @buffer: pointer to the buffer
|
|
* @size: size of the buffer
|
|
* @len: the amount of data inside the buffer
|
|
* @readpos: The next position to read in the buffer.
|
|
*/
|
|
struct seq_buf {
|
|
char *buffer;
|
|
size_t size;
|
|
size_t len;
|
|
loff_t readpos;
|
|
};
|
|
|
|
static inline void seq_buf_clear(struct seq_buf *s)
|
|
{
|
|
s->len = 0;
|
|
s->readpos = 0;
|
|
}
|
|
|
|
static inline void
|
|
seq_buf_init(struct seq_buf *s, unsigned char *buf, unsigned int size)
|
|
{
|
|
s->buffer = buf;
|
|
s->size = size;
|
|
seq_buf_clear(s);
|
|
}
|
|
|
|
/*
|
|
* seq_buf have a buffer that might overflow. When this happens
|
|
* the len and size are set to be equal.
|
|
*/
|
|
static inline bool
|
|
seq_buf_has_overflowed(struct seq_buf *s)
|
|
{
|
|
return s->len > s->size;
|
|
}
|
|
|
|
static inline void
|
|
seq_buf_set_overflow(struct seq_buf *s)
|
|
{
|
|
s->len = s->size + 1;
|
|
}
|
|
|
|
/*
|
|
* How much buffer is left on the seq_buf?
|
|
*/
|
|
static inline unsigned int
|
|
seq_buf_buffer_left(struct seq_buf *s)
|
|
{
|
|
if (seq_buf_has_overflowed(s))
|
|
return 0;
|
|
|
|
return s->size - s->len;
|
|
}
|
|
|
|
/* How much buffer was written? */
|
|
static inline unsigned int seq_buf_used(struct seq_buf *s)
|
|
{
|
|
return min(s->len, s->size);
|
|
}
|
|
|
|
/**
|
|
* seq_buf_get_buf - get buffer to write arbitrary data to
|
|
* @s: the seq_buf handle
|
|
* @bufp: the beginning of the buffer is stored here
|
|
*
|
|
* Return the number of bytes available in the buffer, or zero if
|
|
* there's no space.
|
|
*/
|
|
static inline size_t seq_buf_get_buf(struct seq_buf *s, char **bufp)
|
|
{
|
|
WARN_ON(s->len > s->size + 1);
|
|
|
|
if (s->len < s->size) {
|
|
*bufp = s->buffer + s->len;
|
|
return s->size - s->len;
|
|
}
|
|
|
|
*bufp = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* seq_buf_commit - commit data to the buffer
|
|
* @s: the seq_buf handle
|
|
* @num: the number of bytes to commit
|
|
*
|
|
* Commit @num bytes of data written to a buffer previously acquired
|
|
* by seq_buf_get. To signal an error condition, or that the data
|
|
* didn't fit in the available space, pass a negative @num value.
|
|
*/
|
|
static inline void seq_buf_commit(struct seq_buf *s, int num)
|
|
{
|
|
if (num < 0) {
|
|
seq_buf_set_overflow(s);
|
|
} else {
|
|
/* num must be negative on overflow */
|
|
BUG_ON(s->len + num > s->size);
|
|
s->len += num;
|
|
}
|
|
}
|
|
|
|
extern __printf(2, 3)
|
|
int seq_buf_printf(struct seq_buf *s, const char *fmt, ...);
|
|
extern __printf(2, 0)
|
|
int seq_buf_vprintf(struct seq_buf *s, const char *fmt, va_list args);
|
|
extern int seq_buf_print_seq(struct seq_file *m, struct seq_buf *s);
|
|
extern int seq_buf_to_user(struct seq_buf *s, char __user *ubuf,
|
|
int cnt);
|
|
extern int seq_buf_puts(struct seq_buf *s, const char *str);
|
|
extern int seq_buf_putc(struct seq_buf *s, unsigned char c);
|
|
extern int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len);
|
|
extern int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,
|
|
unsigned int len);
|
|
extern int seq_buf_path(struct seq_buf *s, const struct path *path, const char *esc);
|
|
|
|
#ifdef CONFIG_BINARY_PRINTF
|
|
extern int
|
|
seq_buf_bprintf(struct seq_buf *s, const char *fmt, const u32 *binary);
|
|
#endif
|
|
|
|
#endif /* _LINUX_SEQ_BUF_H */
|