cregit-Linux how code gets into the kernel

Release 4.12 include/linux/seq_buf.h

Directory: include/linux
#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; }

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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); }

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/* * 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; }

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static inline void seq_buf_set_overflow(struct seq_buf *s) { s->len = s->size + 1; }

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/* * 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; }

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/* How much buffer was written? */
static inline unsigned int seq_buf_used(struct seq_buf *s) { return min(s->len, s->size); }

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/** * 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; }

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/** * 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; } }

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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 */

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Directory: include/linux
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