[LIB]: Naive finite state machine based textsearch
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>
diff --git a/lib/Kconfig b/lib/Kconfig
index 16b8fa2..455833a 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -80,4 +80,15 @@
To compile this code as a module, choose M here: the
module will be called ts_kmp.
+config TEXTSEARCH_FSM
+ depends on TEXTSEARCH
+ tristate "Finite state machine"
+ help
+ Say Y here if you want to be able to search text using a
+ naive finite state machine approach implementing a subset
+ of regular expressions.
+
+ To compile this code as a module, choose M here: the
+ module will be called ts_fsm.
+
endmenu