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1b8d449 |
--- grep-2.5.1a/src/search.c.dfa-optional 2005-01-07 14:58:45.714869815 +0000
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1b8d449 |
+++ grep-2.5.1a/src/search.c 2005-01-07 14:58:45.725867716 +0000
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1b8d449 |
@@ -327,12 +327,34 @@
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d619d25 |
int backref, start, len;
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d619d25 |
struct kwsmatch kwsm;
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d619d25 |
size_t i, ret_val;
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d619d25 |
+ static int use_dfa;
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d619d25 |
+ static int use_dfa_checked = 0;
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d619d25 |
#ifdef MBS_SUPPORT
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1b8d449 |
int mb_cur_max = MB_CUR_MAX;
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d619d25 |
mbstate_t mbs;
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d619d25 |
memset (&mbs, '\0', sizeof (mbstate_t));
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d619d25 |
#endif /* MBS_SUPPORT */
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d619d25 |
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d619d25 |
+ if (!use_dfa_checked)
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d619d25 |
+ {
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553606a |
+ char *grep_use_dfa = getenv ("GREP_USE_DFA");
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553606a |
+ if (!grep_use_dfa)
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553606a |
+ {
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553606a |
+#ifdef MBS_SUPPORT
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553606a |
+ /* Turn off DFA when processing multibyte input. */
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553606a |
+ use_dfa = (MB_CUR_MAX == 1);
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553606a |
+#else
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553606a |
+ use_dfa = 1;
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553606a |
+#endif /* MBS_SUPPORT */
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553606a |
+ }
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553606a |
+ else
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553606a |
+ {
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553606a |
+ use_dfa = atoi (grep_use_dfa);
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553606a |
+ }
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553606a |
+
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d619d25 |
+ use_dfa_checked = 1;
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d619d25 |
+ }
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d619d25 |
+
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d619d25 |
buflim = buf + size;
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d619d25 |
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d619d25 |
for (beg = end = buf; end < buflim; beg = end)
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1b8d449 |
@@ -400,7 +422,8 @@
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1b8d449 |
#endif /* MBS_SUPPORT */
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1b8d449 |
(kwsm.index < kwset_exact_matches))
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d619d25 |
goto success_in_beg_and_end;
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d619d25 |
- if (dfaexec (&dfa, beg, end - beg, &backref) == (size_t) -1)
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d619d25 |
+ if (use_dfa &&
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d619d25 |
+ dfaexec (&dfa, beg, end - beg, &backref) == (size_t) -1)
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d619d25 |
continue;
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d619d25 |
}
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d619d25 |
else
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1b8d449 |
@@ -409,7 +432,9 @@
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d619d25 |
#ifdef MBS_SUPPORT
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d619d25 |
size_t bytes_left = 0;
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d619d25 |
#endif /* MBS_SUPPORT */
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d619d25 |
- size_t offset = dfaexec (&dfa, beg, buflim - beg, &backref);
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d619d25 |
+ size_t offset = 0;
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d619d25 |
+ if (use_dfa)
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d619d25 |
+ offset = dfaexec (&dfa, beg, buflim - beg, &backref);
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d619d25 |
if (offset == (size_t) -1)
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d619d25 |
break;
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d619d25 |
/* Narrow down to the line we've found. */
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1b8d449 |
@@ -451,7 +476,7 @@
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acd16e9 |
--beg;
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acd16e9 |
}
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acd16e9 |
/* Successful, no backreferences encountered! */
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acd16e9 |
- if (!backref)
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acd16e9 |
+ if (use_dfa && !backref)
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acd16e9 |
goto success_in_beg_and_end;
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acd16e9 |
}
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acd16e9 |
else
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