67 lines
1.6 KiB
Diff
67 lines
1.6 KiB
Diff
--- grep-2.5.1/src/search.c 2004-11-07 20:11:07.437866925 +0000
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+++ grep-2.5.1/src/search.c 2004-11-10 09:40:44.994750111 +0000
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@@ -305,11 +305,33 @@
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int backref, start, len;
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struct kwsmatch kwsm;
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size_t i, ret_val;
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+ static int use_dfa;
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+ static int use_dfa_checked = 0;
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#ifdef MBS_SUPPORT
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mbstate_t mbs;
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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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@@ -365,7 +387,8 @@
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--beg;
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if (kwsm.index < kwset_exact_matches)
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goto success_in_beg_and_end;
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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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}
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else
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@@ -374,7 +397,9 @@
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#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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/* Narrow down to the line we've found. */
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@@ -416,7 +441,7 @@
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--beg;
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}
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/* Successful, no backreferences encountered! */
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- if (!backref)
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+ if (use_dfa && !backref)
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goto success_in_beg_and_end;
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}
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else
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