mirror of
https://github.com/archlinuxarm/PKGBUILDs.git
synced 2024-09-19 22:08:32 +00:00
76 lines
1.9 KiB
Diff
76 lines
1.9 KiB
Diff
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The DFA algorithm is slow with mutlibytes characters.
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This patch disables the DFA algorithm, but it can be re-enabled by setting
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the GREP_USE_DFA environment variable.
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This patch requires 64-egf-speedup.patch
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--- a/src/search.c.orig 2005-09-06 22:22:17.000000000 +0200
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+++ b/src/search.c 2005-09-06 22:25:41.000000000 +0200
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@@ -326,6 +326,8 @@
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char eol = eolbyte;
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int backref, start, 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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@@ -333,6 +335,26 @@
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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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@@ -400,7 +422,8 @@
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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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}
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else
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@@ -409,7 +432,9 @@
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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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@@ -451,7 +476,7 @@
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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;
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}
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else
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