require './test.pl';
}
-plan tests => 4;
+plan tests => 275;
is(
sprintf("%.40g ",0.01),
'Modification of a read-only value attempted at - line 1.',
{ switches => [ '-w' ] },
q(%n should not be able to modify read-only constants),
-)
+);
+
+# check overflows
+for (int(~0/2+1), ~0, "9999999999999999999") {
+ is(eval {sprintf "%${_}d", 0}, undef, "no sprintf result expected %${_}d");
+ like($@, qr/^Integer overflow in format string for sprintf /, "overflow in sprintf");
+ is(eval {printf "%${_}d\n", 0}, undef, "no printf result expected %${_}d");
+ like($@, qr/^Integer overflow in format string for prtf /, "overflow in printf");
+}
+
+# check %NNN$ for range bounds
+{
+ my ($warn, $bad) = (0,0);
+ local $SIG{__WARN__} = sub {
+ if ($_[0] =~ /uninitialized/) {
+ $warn++
+ }
+ else {
+ $bad++
+ }
+ };
+
+ my $fmt = join('', map("%$_\$s%" . ((1 << 31)-$_) . '$s', 1..20));
+ my $result = sprintf $fmt, qw(a b c d);
+ is($result, "abcd", "only four valid values in $fmt");
+ is($warn, 36, "expected warnings");
+ is($bad, 0, "unexpected warnings");
+}
+
+{
+ foreach my $ord (0 .. 255) {
+ my $bad = 0;
+ local $SIG{__WARN__} = sub {
+ if ($_[0] !~ /^Invalid conversion in sprintf/) {
+ warn $_[0];
+ $bad++;
+ }
+ };
+ my $r = eval {sprintf '%v' . chr $ord};
+ is ($bad, 0, "pattern '%v' . chr $ord");
+ }
+}