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Diffstat (limited to 'lib')
-rw-r--r--lib/textsearch.c14
-rw-r--r--lib/ts_bm.c26
-rw-r--r--lib/ts_fsm.c6
-rw-r--r--lib/ts_kmp.c29
4 files changed, 54 insertions, 21 deletions
diff --git a/lib/textsearch.c b/lib/textsearch.c
index a3e500ad51d..4b7c6075256 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);
- *
* ==========================================================================
*/
@@ -280,7 +282,7 @@ 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;
diff --git a/lib/ts_bm.c b/lib/ts_bm.c
index 4a7fce72898..9e66ee4020e 100644
--- a/lib/ts_bm.c
+++ b/lib/ts_bm.c
@@ -39,6 +39,7 @@
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
+#include <linux/ctype.h>
#include <linux/textsearch.h>
/* Alphabet size, use ASCII */
@@ -64,6 +65,7 @@ static unsigned int bm_find(struct ts_config *conf, struct ts_state *state)
unsigned int i, text_len, consumed = state->offset;
const u8 *text;
int shift = bm->patlen - 1, bs;
+ const u8 icase = conf->flags & TS_IGNORECASE;
for (;;) {
text_len = conf->get_next_block(consumed, &text, conf, state);
@@ -75,7 +77,9 @@ static unsigned int bm_find(struct ts_config *conf, struct ts_state *state)
DEBUGP("Searching in position %d (%c)\n",
shift, text[shift]);
for (i = 0; i < bm->patlen; i++)
- if (text[shift-i] != bm->pattern[bm->patlen-1-i])
+ if ((icase ? toupper(text[shift-i])
+ : text[shift-i])
+ != bm->pattern[bm->patlen-1-i])
goto next;
/* London calling... */
@@ -111,14 +115,18 @@ static int subpattern(u8 *pattern, int i, int j, int g)
return ret;
}
-static void compute_prefix_tbl(struct ts_bm *bm)
+static void compute_prefix_tbl(struct ts_bm *bm, int flags)
{
int i, j, g;
for (i = 0; i < ASIZE; i++)
bm->bad_shift[i] = bm->patlen;
- for (i = 0; i < bm->patlen - 1; i++)
+ for (i = 0; i < bm->patlen - 1; i++) {
bm->bad_shift[bm->pattern[i]] = bm->patlen - 1 - i;
+ if (flags & TS_IGNORECASE)
+ bm->bad_shift[tolower(bm->pattern[i])]
+ = bm->patlen - 1 - i;
+ }
/* Compute the good shift array, used to match reocurrences
* of a subpattern */
@@ -135,10 +143,11 @@ static void compute_prefix_tbl(struct ts_bm *bm)
}
static struct ts_config *bm_init(const void *pattern, unsigned int len,
- gfp_t gfp_mask)
+ gfp_t gfp_mask, int flags)
{
struct ts_config *conf;
struct ts_bm *bm;
+ int i;
unsigned int prefix_tbl_len = len * sizeof(unsigned int);
size_t priv_size = sizeof(*bm) + len + prefix_tbl_len;
@@ -146,11 +155,16 @@ static struct ts_config *bm_init(const void *pattern, unsigned int len,
if (IS_ERR(conf))
return conf;
+ conf->flags = flags;
bm = ts_config_priv(conf);
bm->patlen = len;
bm->pattern = (u8 *) bm->good_shift + prefix_tbl_len;
- memcpy(bm->pattern, pattern, len);
- compute_prefix_tbl(bm);
+ if (flags & TS_IGNORECASE)
+ for (i = 0; i < len; i++)
+ bm->pattern[i] = toupper(((u8 *)pattern)[i]);
+ else
+ memcpy(bm->pattern, pattern, len);
+ compute_prefix_tbl(bm, flags);
return conf;
}
diff --git a/lib/ts_fsm.c b/lib/ts_fsm.c
index af575b61526..5696a35184e 100644
--- a/lib/ts_fsm.c
+++ b/lib/ts_fsm.c
@@ -257,7 +257,7 @@ found_match:
}
static struct ts_config *fsm_init(const void *pattern, unsigned int len,
- gfp_t gfp_mask)
+ gfp_t gfp_mask, int flags)
{
int i, err = -EINVAL;
struct ts_config *conf;
@@ -269,6 +269,9 @@ static struct ts_config *fsm_init(const void *pattern, unsigned int len,
if (len % sizeof(struct ts_fsm_token) || ntokens < 1)
goto errout;
+ if (flags & TS_IGNORECASE)
+ goto errout;
+
for (i = 0; i < ntokens; i++) {
struct ts_fsm_token *t = &tokens[i];
@@ -284,6 +287,7 @@ static struct ts_config *fsm_init(const void *pattern, unsigned int len,
if (IS_ERR(conf))
return conf;
+ conf->flags = flags;
fsm = ts_config_priv(conf);
fsm->ntokens = ntokens;
memcpy(fsm->tokens, pattern, len);
diff --git a/lib/ts_kmp.c b/lib/ts_kmp.c
index 3ced628cab4..632f783e65f 100644
--- a/lib/ts_kmp.c
+++ b/lib/ts_kmp.c
@@ -33,6 +33,7 @@
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
+#include <linux/ctype.h>
#include <linux/textsearch.h>
struct ts_kmp
@@ -47,6 +48,7 @@ static unsigned int kmp_find(struct ts_config *conf, struct ts_state *state)
struct ts_kmp *kmp = ts_config_priv(conf);
unsigned int i, q = 0, text_len, consumed = state->offset;
const u8 *text;
+ const int icase = conf->flags & TS_IGNORECASE;
for (;;) {
text_len = conf->get_next_block(consumed, &text, conf, state);
@@ -55,9 +57,11 @@ static unsigned int kmp_find(struct ts_config *conf, struct ts_state *state)
break;
for (i = 0; i < text_len; i++) {
- while (q > 0 && kmp->pattern[q] != text[i])
+ while (q > 0 && kmp->pattern[q]
+ != (icase ? toupper(text[i]) : text[i]))
q = kmp->prefix_tbl[q - 1];
- if (kmp->pattern[q] == text[i])
+ if (kmp->pattern[q]
+ == (icase ? toupper(text[i]) : text[i]))
q++;
if (unlikely(q == kmp->pattern_len)) {
state->offset = consumed + i + 1;
@@ -72,24 +76,28 @@ static unsigned int kmp_find(struct ts_config *conf, struct ts_state *state)
}
static inline void compute_prefix_tbl(const u8 *pattern, unsigned int len,
- unsigned int *prefix_tbl)
+ unsigned int *prefix_tbl, int flags)
{
unsigned int k, q;
+ const u8 icase = flags & TS_IGNORECASE;
for (k = 0, q = 1; q < len; q++) {
- while (k > 0 && pattern[k] != pattern[q])
+ while (k > 0 && (icase ? toupper(pattern[k]) : pattern[k])
+ != (icase ? toupper(pattern[q]) : pattern[q]))
k = prefix_tbl[k-1];
- if (pattern[k] == pattern[q])
+ if ((icase ? toupper(pattern[k]) : pattern[k])
+ == (icase ? toupper(pattern[q]) : pattern[q]))
k++;
prefix_tbl[q] = k;
}
}
static struct ts_config *kmp_init(const void *pattern, unsigned int len,
- gfp_t gfp_mask)
+ gfp_t gfp_mask, int flags)
{
struct ts_config *conf;
struct ts_kmp *kmp;
+ int i;
unsigned int prefix_tbl_len = len * sizeof(unsigned int);
size_t priv_size = sizeof(*kmp) + len + prefix_tbl_len;
@@ -97,11 +105,16 @@ static struct ts_config *kmp_init(const void *pattern, unsigned int len,
if (IS_ERR(conf))
return conf;
+ conf->flags = flags;
kmp = ts_config_priv(conf);
kmp->pattern_len = len;
- compute_prefix_tbl(pattern, len, kmp->prefix_tbl);
+ compute_prefix_tbl(pattern, len, kmp->prefix_tbl, flags);
kmp->pattern = (u8 *) kmp->prefix_tbl + prefix_tbl_len;
- memcpy(kmp->pattern, pattern, len);
+ if (flags & TS_IGNORECASE)
+ for (i = 0; i < len; i++)
+ kmp->pattern[i] = toupper(((u8 *)pattern)[i]);
+ else
+ memcpy(kmp->pattern, pattern, len);
return conf;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 07:23:44 +0000