4 files changed, 54 insertions, 21 deletions

diff --git a/lib/textsearch.c b/lib/textsearch.c
index a3e500ad51d7..4b7c6075256f 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 4a7fce72898e..9e66ee4020e9 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 af575b61526b..5696a35184e4 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 3ced628cab4b..632f783e65f1 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;
 }