[perl #62646] Maximum string length with substr

(This is only a partial fix, since it doesn't handle lvalue substr)

1 files changed, 16 insertions, 1 deletions

diff --git a/t/re/substr.t b/t/re/substr.t
index c3fa6e10e7..49fd97bea7 100644
--- a/t/re/substr.t
+++ b/t/re/substr.t
@@ -24,7 +24,7 @@ $SIG{__WARN__} = sub {
 
 require './test.pl';
 
-plan(334);
+plan(338);
 
 run_tests() unless caller;
 
@@ -682,4 +682,19 @@ is($x, "\x{100}\x{200}\xFFb");
     is(substr($a,1,1), 'b');
 }
 
+# [perl #62646] offsets exceeding 32 bits on 64-bit system
+SKIP: {
+    skip("32-bit system", 4) unless ~0 > 0xffffffff;
+    my $a = "abc";
+    my $r;
+    $w = 0;
+    $r = substr($a, 0xffffffff, 1);
+    is($r, undef);
+    is($w, 1);
+    $w = 0;
+    $r = substr($a, 0xffffffff+1, 1);
+    is($r, undef);
+    is($w, 1);
+}
+
 }