textsearch: support for case insensitive searching
The function textsearch_prepare has a new flag to support case
insensitive searching.
Signed-off-by: Joonwoo Park <joonwpark81@xxxxxxxxx>
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
---
commit 170f103d11a1e1186e2677fd5f75735b740c025f
tree e1ab155181637bf1ad3d39232b9cc2f40094f286
parent 48d88486554c27296e6f0e4b37aae3bbb37af5d2
author Joonwoo Park <joonwpark81@xxxxxxxxx> Mon, 07 Jul 2008 13:00:17 +0200
committer Patrick McHardy <kaber@xxxxxxxxx> Mon, 07 Jul 2008 13:00:17 +0200
include/linux/textsearch.h | 10 +++++-----
lib/textsearch.c | 14 ++++++++------
2 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/include/linux/textsearch.h b/include/linux/textsearch.h
index 6f371f2..6c34cf2 100644
--- a/include/linux/textsearch.h
+++ b/include/linux/textsearch.h
@@ -10,10 +10,8 @@
struct ts_config;
-/**
- * TS_AUTOLOAD - Automatically load textsearch modules when needed
- */
-#define TS_AUTOLOAD 1
+#define TS_AUTOLOAD 1 /* Automatically load textsearch modules when needed */
+#define TS_IGNORECASE 2 /* Searches string case insensitively */
/**
* struct ts_state - search state
@@ -39,7 +37,7 @@ struct ts_state
struct ts_ops
{
const char *name;
- struct ts_config * (*init)(const void *, unsigned int, gfp_t);
+ 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 *);
@@ -52,12 +50,14 @@ 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
{
struct ts_ops *ops;
+ int flags;
/**
* get_next_block - fetch next block of data
diff --git a/lib/textsearch.c b/lib/textsearch.c
index be8bda3..b451fcc 100644
--- a/lib/textsearch.c
+++ b/lib/textsearch.c
@@ -54,10 +54,13 @@
* USAGE
*
* Before a search can be performed, a configuration must be created
- * by calling textsearch_prepare() specyfing the searching algorithm and
- * the pattern to look for. The returned configuration may then be used
- * for an arbitary amount of times and even in parallel as long as a
- * separate struct ts_state variable is provided to every instance.
+ * by calling textsearch_prepare() specifying the searching algorithm,
+ * the pattern to look for and flags. As a flag, you can set TS_IGNORECASE
+ * to perform case insensitive matching. But it might slow down
+ * performance of algorithm, so you should use it at own your risk.
+ * The returned configuration may then be used for an arbitary
+ * amount of times and even in parallel as long as a separate struct
+ * ts_state variable is provided to every instance.
*
* The actual search is performed by either calling textsearch_find_-
* continuous() for linear data or by providing an own get_next_block()
@@ -89,7 +92,6 @@
* panic("Oh my god, dancing chickens at %d\n", pos);
*
* textsearch_destroy(conf);
- *
* ==========================================================================
*/
@@ -279,7 +281,7 @@ struct ts_config *textsearch_prepare(const char *algo, const void *pattern,
if (ops == NULL)
goto errout;
- conf = ops->init(pattern, len, gfp_mask);
+ conf = ops->init(pattern, len, gfp_mask, flags);
if (IS_ERR(conf)) {
err = PTR_ERR(conf);
goto errout;
--
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