From 4e3399f9b267135d193509ba5240514af04e9fec Mon Sep 17 00:00:00 2001
From: Yitzchak Scott-Thoennes <sthoenna@efn.org>
Date: Mon, 4 Mar 2002 08:24:32 -0800
Subject: [PATCH] Re: [PATCH] Re: [ID 20000922.001] Implicit comparison to $.
 not performed before filehandle read Message-ID: <ABBh8gzkgezX092yn@efn.org>

p4raw-id: //depot/perl@15054
---
 op.h        |  1 +
 pp_ctl.c    | 33 ++++++++++++++++++++++++---------
 t/op/flip.t | 34 ++++++++++++++++++++++++++++++++--
 3 files changed, 57 insertions(+), 11 deletions(-)

diff --git a/op.h b/op.h
index 604eaa3..1cbacb3 100644
--- a/op.h
+++ b/op.h
@@ -105,6 +105,7 @@ Deprecated.  Use C<GIMME_V> instead.
 				/*  On pushre, re is /\s+/ imp. by split " " */
 				/*  On regcomp, "use re 'eval'" was in scope */
 				/*  On OP_READLINE, was <$filehandle> */
+				/*  On RV2[SG]V, don't create GV--in defined()*/
 
 /* old names; don't use in new code, but don't break them, either */
 #define OPf_LIST	OPf_WANT_LIST
diff --git a/pp_ctl.c b/pp_ctl.c
index eb13949..81a96de 100644
--- a/pp_ctl.c
+++ b/pp_ctl.c
@@ -896,13 +896,16 @@ PP(pp_flip)
     else {
 	dTOPss;
 	SV *targ = PAD_SV(PL_op->op_targ);
- 	int flip;
+ 	int flip = 0;
 
  	if (PL_op->op_private & OPpFLIP_LINENUM) {
- 	    struct io *gp_io;
- 	    flip = PL_last_in_gv
- 		&& (gp_io = GvIO(PL_last_in_gv))
- 		&& SvIV(sv) == (IV)IoLINES(gp_io);
+	    if (GvIO(PL_last_in_gv)) {
+		flip = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
+	    }
+	    else {
+		GV *gv = gv_fetchpv(".", TRUE, SVt_PV);
+		if (gv && GvSV(gv)) flip = SvIV(sv) == SvIV(GvSV(gv));
+	    }
  	} else {
  	    flip = SvTRUE(sv);
  	}
@@ -980,11 +983,23 @@ PP(pp_flop)
     else {
 	dTOPss;
 	SV *targ = PAD_SV(cUNOP->op_first->op_targ);
+	int flop = 0;
 	sv_inc(targ);
-	if ((PL_op->op_private & OPpFLIP_LINENUM)
-	  ? (GvIO(PL_last_in_gv)
-	     && SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv)))
-	  : SvTRUE(sv) ) {
+
+	if (PL_op->op_private & OPpFLIP_LINENUM) {
+	    if (GvIO(PL_last_in_gv)) {
+		flop = SvIV(sv) == (IV)IoLINES(GvIOp(PL_last_in_gv));
+	    }
+	    else {
+		GV *gv = gv_fetchpv(".", TRUE, SVt_PV);
+		if (gv && GvSV(gv)) flop = SvIV(sv) == SvIV(GvSV(gv));
+	    }
+	}
+	else {
+	    flop = SvTRUE(sv);
+	}
+
+	if (flop) {
 	    sv_setiv(PAD_SV(((UNOP*)cUNOP->op_first)->op_first->op_targ), 0);
 	    sv_catpv(targ, "E0");
 	}
diff --git a/t/op/flip.t b/t/op/flip.t
index d9fa736..70666ac 100755
--- a/t/op/flip.t
+++ b/t/op/flip.t
@@ -4,7 +4,7 @@
 
 chdir 't' if -d 't';
 
-print "1..10\n";
+print "1..15\n";
 
 @a = (1,2,3,4,5,6,7,8,9,10,11,12);
 
@@ -19,6 +19,9 @@ if ($y eq '12E0123E0') {print "ok 7\n";} else {print "not ok 7\n";}
 
 @a = ('a','b','c','d','e','f','g');
 
+{
+local $.;
+
 open(of,'harness') or die "Can't open harness: $!";
 while (<of>) {
     (3 .. 5) && ($foo .= $_);
@@ -34,5 +37,32 @@ if (($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;
+    $x = 1..10;
+    print "ok 10\n";
+}
+
 }
+
+if (!defined $.) { print "ok 11\n" } else { print "not ok 11 # $.\n" }
+
+use warnings;
+my $warn='';
+$SIG{__WARN__} = sub { $warn .= join '', @_ };
+
+if (0..2) { print "ok 12\n" } else { print "not ok 12\n" }
+
+if ($warn =~ /uninitialized/) { print "ok 13\n" } else { print "not ok 13\n" }
+$warn = '';
+
+$x = "foo".."bar";
+
+if ((() = ($warn =~ /isn't numeric/g)) == 2) {
+    print "ok 14\n"
+}
+else {
+    print "not ok 14\n"
+}
+$warn = '';
+
+$. = 15;
+if (15..0) { print "ok 15\n" } else { print "not ok 15\n" }
-- 
2.7.4