From d619d2536890e97e3e2f7d98261eddfa66c61c37 Mon Sep 17 00:00:00 2001
From: Tim Waugh <twaugh@fedoraproject.org>
Date: Fri, 5 Nov 2004 18:09:53 +0000
Subject: [PATCH] - Fixes to egf-speedup patch: now it does not change any
 functionality, as     intended. - GREP_NO_DFA now turns off the DFA engine,
 for performance testing.

---
 grep-2.5.1-dfa-optional.patch | 56 +++++++++++++++++++++++++++++++++++
 grep.spec                     |  9 +++++-
 2 files changed, 64 insertions(+), 1 deletion(-)
 create mode 100644 grep-2.5.1-dfa-optional.patch

diff --git a/grep-2.5.1-dfa-optional.patch b/grep-2.5.1-dfa-optional.patch
new file mode 100644
index 0000000..0b9d981
--- /dev/null
+++ b/grep-2.5.1-dfa-optional.patch
@@ -0,0 +1,56 @@
+--- grep-2.5.1/src/search.c.dfa-optional	2004-11-05 16:16:45.230641568 +0000
++++ grep-2.5.1/src/search.c	2004-11-05 16:36:19.679817421 +0000
+@@ -305,11 +305,19 @@
+   int backref, start, len;
+   struct kwsmatch kwsm;
+   size_t i, ret_val;
++  static int use_dfa;
++  static int use_dfa_checked = 0;
+ #ifdef MBS_SUPPORT
+   mbstate_t mbs;
+   memset (&mbs, '\0', sizeof (mbstate_t));
+ #endif /* MBS_SUPPORT */
+ 
++  if (!use_dfa_checked)
++    {
++      use_dfa = (getenv ("GREP_NO_DFA") == NULL);
++      use_dfa_checked = 1;
++    }
++
+   buflim = buf + size;
+ 
+   for (beg = end = buf; end < buflim; beg = end)
+@@ -365,7 +373,8 @@
+ 		--beg;
+ 	      if (kwsm.index < kwset_exact_matches)
+ 		goto success_in_beg_and_end;
+-	      if (dfaexec (&dfa, beg, end - beg, &backref) == (size_t) -1)
++	      if (use_dfa &&
++		  dfaexec (&dfa, beg, end - beg, &backref) == (size_t) -1)
+ 		continue;
+ 	    }
+ 	  else
+@@ -374,7 +383,9 @@
+ #ifdef MBS_SUPPORT
+ 	      size_t bytes_left = 0;
+ #endif /* MBS_SUPPORT */
+-	      size_t offset = dfaexec (&dfa, beg, buflim - beg, &backref);
++	      size_t offset = 0;
++	      if (use_dfa)
++		offset = dfaexec (&dfa, beg, buflim - beg, &backref);
+ 	      if (offset == (size_t) -1)
+ 		break;
+ 	      /* Narrow down to the line we've found. */
+@@ -450,7 +461,11 @@
+ 		    if ((start == 0 || !WCHAR ((unsigned char) beg[start - 1]))
+ 			&& (len == end - beg - 1
+ 			    || !WCHAR ((unsigned char) beg[start + len])))
+-		      goto success_in_start_and_len;
++		      {
++			if (len == 0)
++			  len++;
++			goto success_in_start_and_len;
++		      }
+ 		    if (len > 0)
+ 		      {
+ 			/* Try a shorter length anchored at the same place. */
diff --git a/grep.spec b/grep.spec
index a4474b7..59479b5 100644
--- a/grep.spec
+++ b/grep.spec
@@ -1,7 +1,7 @@
 Summary: The GNU versions of grep pattern matching utilities.
 Name: grep
 Version: 2.5.1
-Release: 34
+Release: 35
 License: GPL
 Group: Applications/Text
 Source: ftp://ftp.gnu.org/pub/gnu/grep/grep-%{version}.tar.bz2
@@ -11,6 +11,7 @@ Patch2: grep-2.5-i18n.patch
 Patch3: grep-2.5.1-oi.patch
 Patch4: grep-2.5.1-manpage.patch
 Patch5: grep-2.5.1-egf-speedup.patch
+Patch6: grep-2.5.1-dfa-optional.patch
 URL: http://www.gnu.org/software/grep/
 Prereq: /sbin/install-info
 Buildroot: %{_tmppath}/%{name}-%{version}-root
@@ -34,6 +35,7 @@ utility for searching through text.
 %patch3 -p1 -b .oi
 %patch4 -p1 -b .manpage
 %patch5 -p1 -b .egf-speedup
+%patch6 -p1 -b .dfa-optional
 
 %build
 [ ! -e configure ] && ./autogen.sh
@@ -81,6 +83,11 @@ fi
 %{_mandir}/*/*
 
 %changelog
+* Fri Nov  5 2004 Tim Waugh <twaugh@redhat.com> 2.5.1-35
+- Fixes to egf-speedup patch: now it does not change any functionality,
+  as intended.
+- GREP_NO_DFA now turns off the DFA engine, for performance testing.
+
 * Thu Nov  4 2004 Tim Waugh <twaugh@redhat.com> 2.5.1-34
 - More improvements to egf-speedup patch (bug #138076).