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A finite state machine consists of n states (struct ts_fsm_token) representing the pattern as a finite automation. The data is read sequentially on a octet basis. Every state token specifies the number of recurrences and the type of value accepted which can be either a specific character or ctype based set of characters. The available type of recurrences include 1, (0|1), [0 n], and [1 n]. The algorithm differs between strict/non-strict mode specyfing whether the pattern has to start at the first octect. Strict mode is enabled by default and can be disabled by inserting TS_FSM_HEAD_IGNORE as the first token in the chain. The runtime performance of the algorithm should be around O(n), however while in strict mode the average runtime can be better. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
#ifndef __LINUX_TEXTSEARCH_FSM_H
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#define __LINUX_TEXTSEARCH_FSM_H
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#include <linux/types.h>
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enum {
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TS_FSM_SPECIFIC, /* specific character */
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TS_FSM_WILDCARD, /* any character */
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TS_FSM_DIGIT, /* isdigit() */
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TS_FSM_XDIGIT, /* isxdigit() */
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TS_FSM_PRINT, /* isprint() */
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TS_FSM_ALPHA, /* isalpha() */
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TS_FSM_ALNUM, /* isalnum() */
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TS_FSM_ASCII, /* isascii() */
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TS_FSM_CNTRL, /* iscntrl() */
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TS_FSM_GRAPH, /* isgraph() */
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TS_FSM_LOWER, /* islower() */
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TS_FSM_UPPER, /* isupper() */
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TS_FSM_PUNCT, /* ispunct() */
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TS_FSM_SPACE, /* isspace() */
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__TS_FSM_TYPE_MAX,
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};
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#define TS_FSM_TYPE_MAX (__TS_FSM_TYPE_MAX - 1)
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enum {
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TS_FSM_SINGLE, /* 1 occurrence */
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TS_FSM_PERHAPS, /* 1 or 0 occurrence */
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TS_FSM_ANY, /* 0..n occurrences */
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TS_FSM_MULTI, /* 1..n occurrences */
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TS_FSM_HEAD_IGNORE, /* 0..n ignored occurrences at head */
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__TS_FSM_RECUR_MAX,
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};
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#define TS_FSM_RECUR_MAX (__TS_FSM_RECUR_MAX - 1)
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/**
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* struct ts_fsm_token - state machine token (state)
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* @type: type of token
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* @recur: number of recurrences
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* @value: character value for TS_FSM_SPECIFIC
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*/
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struct ts_fsm_token
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{
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__u16 type;
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__u8 recur;
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__u8 value;
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};
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#endif
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