From 790090df87a94d63cdbf866bce162581c29c2abf Mon Sep 17 00:00:00 2001
From: Hugo van der Sanden <hv@crypt.org>
Date: Thu, 19 Oct 2000 00:25:58 +0100
Subject: [PATCH] Re: [ID 20001018.008] flip-flop bug when there's no <FH>
 Message-Id: <200010182225.XAA20330@crypt.compulink.co.uk>

p4raw-id: //depot/perl@7365
---
 pp_ctl.c             | 15 +++++++++++----
 pp_hot.c             |  3 ++-
 t/op/flip.t          |  9 ++++++++-
 t/pragma/warn/pp_hot |  3 +++
 4 files changed, 24 insertions(+), 6 deletions(-)

diff --git a/pp_ctl.c b/pp_ctl.c
index d69aaa8..cf2000e 100644
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -1005,10 +1005,17 @@ PP(pp_flip)
     else {
 	dTOPss;
 	SV *targ = PAD_SV(PL_op->op_targ);
-
-	if ((PL_op->op_private & OPpFLIP_LINENUM)
-	  ? (PL_last_in_gv && SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv)))
-	  : SvTRUE(sv) ) {
+ 	int flip;
+
+ 	if (PL_op->op_private & OPpFLIP_LINENUM) {
+ 	    struct io *gp_io;
+ 	    flip = PL_last_in_gv
+ 		&& (gp_io = GvIOp(PL_last_in_gv))
+ 		&& SvIV(sv) == (IV)IoLINES(gp_io);
+ 	} else {
+ 	    flip = SvTRUE(sv);
+ 	}
+ 	if (flip) {
 	    sv_setiv(PAD_SV(cUNOP->op_first->op_targ), 1);
 	    if (PL_op->op_flags & OPf_SPECIAL) {
 		sv_setiv(targ, 1);
diff --git a/pp_hot.c b/pp_hot.c
index 6f582c0..9b0573b 100644
--- a/pp_hot.c
+++ b/pp_hot.c
@@ -1412,7 +1412,8 @@ Perl_do_readline(pTHX)
 	}
     }
     if (!fp) {
-	if (ckWARN2(WARN_GLOB,WARN_CLOSED) && io && !(IoFLAGS(io) & IOf_START)) {
+	if (ckWARN2(WARN_GLOB, WARN_CLOSED)
+		&& (!io || !(IoFLAGS(io) & IOf_START))) {
 	    if (type == OP_GLOB)
 		Perl_warner(aTHX_ WARN_GLOB,
 			    "glob failed (can't start child: %s)",
diff --git a/t/op/flip.t b/t/op/flip.t
index 20167f3..f66af27 100755
--- a/t/op/flip.t
+++ b/t/op/flip.t
@@ -2,7 +2,7 @@
 
 # $RCSfile: flip.t,v $$Revision: 4.1 $$Date: 92/08/07 18:27:52 $
 
-print "1..9\n";
+print "1..10\n";
 
 @a = (1,2,3,4,5,6,7,8,9,10,11,12);
 
@@ -27,3 +27,10 @@ if ($x eq 3) {print "ok 8\n";} else {print "not ok 8 $x:$foo:\n";}
 
 $x = 3.14;
 if (($x...$x) eq "1") {print "ok 9\n";} else {print "not ok 9\n";}
+
+{
+    # coredump reported in bug 20001018.008
+    readline(UNKNOWN);
+    $. = 1;
+    print "ok 10\n" unless 1 .. 10;
+}
diff --git a/t/pragma/warn/pp_hot b/t/pragma/warn/pp_hot
index 3c3cc60..4268205 100644
--- a/t/pragma/warn/pp_hot
+++ b/t/pragma/warn/pp_hot
@@ -33,6 +33,9 @@
   readline() on closed filehandle %s		[Perl_do_readline]
     close STDIN ; $a = <STDIN>;
 
+  readline() on closed filehandle %s		[Perl_do_readline]
+    readline(NONESUCH);
+
   glob failed (child exited with status %d%s)	[Perl_do_readline] <<TODO
 
   Deep recursion on subroutine \"%s\"		[Perl_sub_crush_depth]
-- 
2.7.4