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d612644 |
--- ./src/search.c.old 2010-02-12 14:29:01.000000000 +0100
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+++ ./src/search.c 2010-02-12 14:29:18.207410166 +0100
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@@ -278,6 +278,8 @@
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char eol = eolbyte;
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int backref, start, len, best_len;
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struct kwsmatch kwsm;
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+ static int use_dfa;
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+ static int use_dfa_checked = 0;
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size_t i, ret_val;
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#ifdef MBS_SUPPORT
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int mb_cur_max = MB_CUR_MAX;
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@@ -285,6 +287,26 @@
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memset (&mbs, '\0', sizeof (mbstate_t));
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#endif /* MBS_SUPPORT */
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+ if (!use_dfa_checked)
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+ {
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+ char *grep_use_dfa = getenv ("GREP_USE_DFA");
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+ if (!grep_use_dfa)
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+ {
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+#ifdef MBS_SUPPORT
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+ /* Turn off DFA when processing multibyte input. */
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+ use_dfa = (MB_CUR_MAX == 1);
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+#else
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+ use_dfa = 1;
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+#endif /* MBS_SUPPORT */
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+ }
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+ else
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+ {
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+ use_dfa = atoi (grep_use_dfa);
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+ }
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+
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+ use_dfa_checked = 1;
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+ }
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+
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buflim = buf + size;
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for (beg = end = buf; end < buflim; beg = end)
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d612644 |
@@ -353,7 +375,8 @@
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#endif /* MBS_SUPPORT */
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(kwsm.index < kwset_exact_matches))
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goto success;
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- if (dfaexec (&dfa, beg, end - beg, &backref) == (size_t) -1)
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+ if (use_dfa &&
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+ dfaexec (&dfa, beg, end - beg, &backref) == (size_t) -1)
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continue;
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d612644 |
}
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else
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d612644 |
@@ -362,7 +385,9 @@
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d612644 |
#ifdef MBS_SUPPORT
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size_t bytes_left = 0;
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#endif /* MBS_SUPPORT */
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- size_t offset = dfaexec (&dfa, beg, buflim - beg, &backref);
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+ size_t offset = 0;
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+ if (use_dfa)
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+ offset = dfaexec (&dfa, beg, buflim - beg, &backref);
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if (offset == (size_t) -1)
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break;
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d612644 |
/* Narrow down to the line we've found. */
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d612644 |
@@ -404,7 +429,7 @@
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--beg;
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d612644 |
}
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d612644 |
/* Successful, no backreferences encountered! */
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d612644 |
- if (!backref)
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+ if (use_dfa && !backref)
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goto success;
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d612644 |
}
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d612644 |
else
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