1 files changed, 101 insertions, 0 deletions
diff --git a/ext/PerlIO/t/scalar.t b/ext/PerlIO/t/scalar.t
new file mode 100644
index 0000000000..8368e666b9
--- /dev/null
+++ b/ext/PerlIO/t/scalar.t
@@ -0,0 +1,101 @@
+#!./perl
+
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = '../lib';
+    unless (find PerlIO::Layer 'perlio') {
+	print "1..0 # Skip: not perlio\n";
+	exit 0;
+    }
+}
+
+$| = 1;
+print "1..20\n";
+
+my $fh;
+my $var = "ok 2\n";
+open($fh,"+<",\$var) or print "not ";
+print "ok 1\n";
+print <$fh>;
+print "not " unless eof($fh);
+print "ok 3\n";
+seek($fh,0,0) or print "not ";
+print "not " if eof($fh);
+print "ok 4\n";
+print "ok 5\n";
+print $fh "ok 7\n" or print "not ";
+print "ok 6\n";
+print $var;
+$var = "foo\nbar\n";
+seek($fh,0,0) or print "not ";
+print "not " if eof($fh);
+print "ok 8\n";
+print "not " unless <$fh> eq "foo\n";
+print "ok 9\n";
+my $rv = close $fh;
+if (!$rv) {
+    print "# Close on scalar failed: $!\n";
+    print "not ";
+}
+print "ok 10\n";
+
+# Test that semantics are similar to normal file-based I/O
+# Check that ">" clobbers the scalar
+$var = "Something";
+open $fh, ">", \$var;
+print "# Got [$var], expect []\n";
+print "not " unless $var eq "";
+print "ok 11\n";
+#  Check that file offset set to beginning of scalar
+my $off = tell($fh);
+print "# Got $off, expect 0\n";
+print "not " unless $off == 0;
+print "ok 12\n";
+# Check that writes go where they should and update the offset
+$var = "Something";
+print $fh "Brea";
+$off = tell($fh);
+print "# Got $off, expect 4\n";
+print "not " unless $off == 4;
+print "ok 13\n";
+print "# Got [$var], expect [Breathing]\n";
+print "not " unless $var eq "Breathing";
+print "ok 14\n";
+close $fh;
+
+# Check that ">>" appends to the scalar
+$var = "Something ";
+open $fh, ">>", \$var;
+$off = tell($fh);
+print "# Got $off, expect 10\n";
+print "not " unless $off == 10;
+print "ok 15\n";
+print "# Got [$var], expect [Something ]\n";
+print "not " unless $var eq "Something ";
+print "ok 16\n";
+#  Check that further writes go to the very end of the scalar
+$var .= "else ";
+print "# Got [$var], expect [Something else ]\n";
+print "not " unless $var eq "Something else ";
+print "ok 17\n";
+$off = tell($fh);
+print "# Got $off, expect 10\n";
+print "not " unless $off == 10;
+print "ok 18\n";
+print $fh "is here";
+print "# Got [$var], expect [Something else is here]\n";
+print "not " unless $var eq "Something else is here";
+print "ok 19\n";
+close $fh;
+
+# Check that updates to the scalar from elsewhere do not
+# cause problems
+$var = "line one\nline two\line three\n";
+open $fh, "<", \$var;
+while (<$fh>) {
+    $var = "foo";
+}
+close $fh;
+print "# Got [$var], expect [foo]\n";
+print "not " unless $var eq "foo";
+print "ok 20\n";