Fix the correct handling of bodies (Perl regexps were sometimes
not properly working on SV * bodies).  We now use a shared string.
For Perl < 5.7.1, fall back to a copy of such bodies.  At least,
that method is reliable, even though it were 17% slower.

http://inn.eyrie.org/viewcvs/branches/2.4/include/ppport.h?r1=7237&r2=7951&pathrev=7951&view=patch
http://inn.eyrie.org/viewcvs/branches/2.4/innd/perl.c?r1=7815&r2=7951&pathrev=7951&view=patch

--- 2.4/innd/perl.c	2008/05/05 08:43:58	7815
+++ 2.4/innd/perl.c	2008/08/05 19:41:17	7951
@@ -69,7 +69,6 @@
     CV *        filter;
     int         i, rc;
     char *      p;
-    static SV * body = NULL;
     static char buf[256];
 
     if (!PerlFilterActive) return NULL;
@@ -87,23 +86,19 @@
     }
 
     /* Store the article body.  We don't want to make another copy of it,
-       since it could potentially be quite large.  Instead, stash the
-       pointer in the static SV * body.  We set LEN to 0 and inc the
-       refcount to tell Perl not to free it (either one should be enough).
-       Requires 5.004.  In testing, this produced a 17% speed improvement
-       over making a copy of the article body for a fairly heavy filter. */
+     * since it could potentially be quite large.  In testing, this produced
+     * a 17% speed improvement over making a copy of the article body
+     * for a fairly heavy filter.
+     * Available since Perl 5.7.1, newSVpvn_share allows to avoid such
+     * a copy (getting round its use for older versions of Perl leads
+     * to unreliable SV * bodies as for regexps).  And for Perl not to
+     * compute a hash for artBody, we give it "42". */
     if (artBody) {
-        if (!body) {
-            body = newSV(0);
-            (void) SvUPGRADE(body, SVt_PV);
-        }
-        SvPVX(body) = artBody;
-        SvCUR_set(body, artLen);
-        SvLEN_set(body, 0);
-        SvPOK_on(body);
-        (void) SvREADONLY_on(body);
-        (void) SvREFCNT_inc(body);
-        hv_store(hdr, "__BODY__", 8, body, 0);
+#if (PERL_REVISION == 5) && ((PERL_VERSION < 7) || ((PERL_VERSION == 7) && (PERL_SUBVERSION < 1)))
+        hv_store(hdr, "__BODY__", 8, newSVpv(artBody, artLen), 0);
+#else
+        hv_store(hdr, "__BODY__", 8, newSVpvn_share(artBody, artLen, 42), 0);
+#endif /* Perl < 5.7.1 */
     }
 
     hv_store(hdr, "__LINES__", 9, newSViv(lines), 0);
--- 2.4/include/ppport.h	2005/06/05 21:57:50	7237
+++ 2.4/include/ppport.h	2008/08/05 19:41:17	7951
@@ -150,6 +150,7 @@
 #	endif
 #endif
 #ifndef PERL_VERSION
+#       define PERL_REVISION (5)
 #       ifdef PERL_PATCHLEVEL
 #               define PERL_VERSION    PERL_PATCHLEVEL
 #       else
@@ -162,7 +163,7 @@
 #	define ERRSV perl_get_sv("@",false)
 #endif
 
-#if (PERL_VERSION < 4) || ((PERL_VERSION == 4) && (PERL_SUBVERSION <= 4))
+#if (PERL_REVISION == 5) && ((PERL_VERSION < 4) || ((PERL_VERSION == 4) && (PERL_SUBVERSION <= 4)))
 #	define PL_sv_undef	sv_undef
 #	define PL_sv_yes	sv_yes
 #	define PL_sv_no		sv_no
@@ -174,7 +175,7 @@
 #	define PL_copline	copline
 #endif
 
-#if (PERL_VERSION < 5)
+#if (PERL_REVISION == 5) && (PERL_VERSION < 5)
 #	undef dTHR
 #	ifdef WIN32
 #		define dTHR extern int Perl___notused