linux/include/linux/textsearch.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_TEXTSEARCH_H
#define __LINUX_TEXTSEARCH_H

#include <linux/types.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/slab.h>

struct module;

struct ts_config;

#define TS_AUTOLOAD …
#define TS_IGNORECASE …

/**
 * struct ts_state - search state
 * @offset: offset for next match
 * @cb: control buffer, for persistent variables of get_next_block()
 */
struct ts_state
{ … };

/**
 * struct ts_ops - search module operations
 * @name: name of search algorithm
 * @init: initialization function to prepare a search
 * @find: find the next occurrence of the pattern
 * @destroy: destroy algorithm specific parts of a search configuration
 * @get_pattern: return head of pattern
 * @get_pattern_len: return length of pattern
 * @owner: module reference to algorithm
 */
struct ts_ops
{ … };

/**
 * struct ts_config - search configuration
 * @ops: operations of chosen algorithm
 * @flags: flags
 * @get_next_block: callback to fetch the next block to search in
 * @finish: callback to finalize a search
 */
struct ts_config
{ … };

/**
 * textsearch_next - continue searching for a pattern
 * @conf: search configuration
 * @state: search state
 *
 * Continues a search looking for more occurrences of the pattern.
 * textsearch_find() must be called to find the first occurrence
 * in order to reset the state.
 *
 * Returns the position of the next occurrence of the pattern or
 * UINT_MAX if not match was found.
 */ 
static inline unsigned int textsearch_next(struct ts_config *conf,
					   struct ts_state *state)
{ … }

/**
 * textsearch_find - start searching for a pattern
 * @conf: search configuration
 * @state: search state
 *
 * Returns the position of first occurrence of the pattern or
 * UINT_MAX if no match was found.
 */ 
static inline unsigned int textsearch_find(struct ts_config *conf,
					   struct ts_state *state)
{ … }

/**
 * textsearch_get_pattern - return head of the pattern
 * @conf: search configuration
 */
static inline void *textsearch_get_pattern(struct ts_config *conf)
{ … }

/**
 * textsearch_get_pattern_len - return length of the pattern
 * @conf: search configuration
 */
static inline unsigned int textsearch_get_pattern_len(struct ts_config *conf)
{ … }

extern int textsearch_register(struct ts_ops *);
extern int textsearch_unregister(struct ts_ops *);
extern struct ts_config *textsearch_prepare(const char *, const void *,
					    unsigned int, gfp_t, int);
extern void textsearch_destroy(struct ts_config *conf);
extern unsigned int textsearch_find_continuous(struct ts_config *,
					       struct ts_state *,
					       const void *, unsigned int);


#define TS_PRIV_ALIGNTO …
#define TS_PRIV_ALIGN(len) …

static inline struct ts_config *alloc_ts_config(size_t payload,
						gfp_t gfp_mask)
{ … }

static inline void *ts_config_priv(struct ts_config *conf)
{ … }

#endif