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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181/* 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 1 /* Automatically load textsearch modules when needed */#define TS_IGNORECASE 2 /* Searches string case insensitively */
/** * struct ts_state - search state * @offset: offset for next match * @cb: control buffer, for persistent variables of get_next_block() */struct ts_state{ unsigned int offset; char cb[48];};
/** * 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 * @list: list to search */struct ts_ops{ const char *name; struct ts_config * (*init)(const void *, unsigned int, gfp_t, int); unsigned int (*find)(struct ts_config *, struct ts_state *); void (*destroy)(struct ts_config *); void * (*get_pattern)(struct ts_config *); unsigned int (*get_pattern_len)(struct ts_config *); struct module *owner; struct list_head list;};
/** * 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{ struct ts_ops *ops; int flags;
/** * @get_next_block: fetch next block of data * @consumed: number of bytes consumed by the caller * @dst: destination buffer * @conf: search configuration * @state: search state * * Called repeatedly until 0 is returned. Must assign the * head of the next block of data to &*dst and return the length * of the block or 0 if at the end. consumed == 0 indicates * a new search. May store/read persistent values in state->cb. */ unsigned int (*get_next_block)(unsigned int consumed, const u8 **dst, struct ts_config *conf, struct ts_state *state);
/** * @finish: finalize/clean a series of get_next_block() calls * @conf: search configuration * @state: search state * * Called after the last use of get_next_block(), may be used * to cleanup any leftovers. */ void (*finish)(struct ts_config *conf, struct ts_state *state);};
/** * 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){ unsigned int ret = conf->ops->find(conf, state);
if (conf->finish) conf->finish(conf, state);
return ret;}
/** * 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){ state->offset = 0; return textsearch_next(conf, state);}
/** * textsearch_get_pattern - return head of the pattern * @conf: search configuration */static inline void *textsearch_get_pattern(struct ts_config *conf){ return conf->ops->get_pattern(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){ return conf->ops->get_pattern_len(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 8#define TS_PRIV_ALIGN(len) (((len) + TS_PRIV_ALIGNTO-1) & ~(TS_PRIV_ALIGNTO-1))
static inline struct ts_config *alloc_ts_config(size_t payload, gfp_t gfp_mask){ struct ts_config *conf;
conf = kzalloc(TS_PRIV_ALIGN(sizeof(*conf)) + payload, gfp_mask); if (conf == NULL) return ERR_PTR(-ENOMEM);
return conf;}
static inline void *ts_config_priv(struct ts_config *conf){ return ((u8 *) conf + TS_PRIV_ALIGN(sizeof(struct ts_config)));}
#endif