Re: [PATCH 3/8] textsearch: fix Boyer-Moore algorithm for case insensitive searching

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Joonwoo Park wrote:
2008/6/21 Patrick McHardy <kaber@xxxxxxxxx>:
+static void compute_prefix_tbl(struct ts_bm *bm, u8 icase)
 {
       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 (icase)
+                       bm->bad_shift[tolower(bm->pattern[i])]
+                           = bm->patlen - 1 - i;
+       }
You use toupper() above and tolower() here, is that correct?


It should be, bm->pattern's characters are all upper case since It was
altered before.
So we should use toupper() for target string character to compare.
And to ignore case, we should prepare one more bad_shift array
calculation, opposite tolower() should be used for it.

OK thanks. I'll wait for an ACK from Thomas before applying
them though.

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