1 files changed, 135 insertions, 0 deletions
diff --git a/tests/fdstream/driver.cxx b/tests/fdstream/driver.cxx
new file mode 100644
index 0000000..3972473
--- /dev/null
+++ b/tests/fdstream/driver.cxx
@@ -0,0 +1,135 @@
+// file      : tests/fdstream/driver.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <string>
+#include <cassert>
+#include <system_error>
+
+#include <butl/path>
+#include <butl/fdstream>
+#include <butl/filesystem>
+
+using namespace std;
+using namespace butl;
+
+static const string text1 ("ABCDEF\nXYZ");
+static const string text2 ("12");            // Keep shorter than text1.
+static const string text3 ("ABCDEF\r\nXYZ");
+
+static string
+from_file (const path& f, fdopen_mode m = fdopen_mode::none)
+{
+  ifdstream ifs (fdopen (f, m | fdopen_mode::in));
+  ifs.exceptions (ifdstream::badbit);
+
+  string s;
+  getline (ifs, s, '\0');
+  return s;
+}
+
+static void
+to_file (const path& f, const string& s, fdopen_mode m = fdopen_mode::none)
+{
+  ofdstream ofs (fdopen (f, m | fdopen_mode::out));
+  ofs.exceptions (ofdstream::badbit | ofdstream::failbit);
+  ofs << s;
+}
+
+int
+main ()
+{
+  dir_path td (dir_path::temp_directory () / dir_path ("butl-fdstream"));
+
+  // Recreate the temporary directory (that possibly exists from the previous
+  // faulty run) for the test files. Delete the directory only if the test
+  // succeeds to simplify the failure research.
+  //
+  try_rmdir_r (td);
+  assert (try_mkdir (td) == mkdir_status::success);
+
+  path f (td / path ("file"));
+
+  try
+  {
+    fdopen (f, fdopen_mode::out); // fdopen_mode::create is missed.
+    assert (false);
+  }
+  catch (const system_error&)
+  {
+  }
+
+  // Read from the newly created empty file.
+  //
+  assert (from_file (f, fdopen_mode::create) == "");
+  assert (try_rmfile (f) == rmfile_status::success);
+
+  to_file (f, text1, fdopen_mode::create);
+  assert (from_file (f) == text1);
+
+  // Read from the file opened in R/W mode.
+  //
+  assert (from_file (f, fdopen_mode::out) == text1);
+
+  try
+  {
+    // Fail to create if the file already exists.
+    //
+    fdopen (
+      f, fdopen_mode::out | fdopen_mode::create | fdopen_mode::exclusive);
+
+    assert (false);
+  }
+  catch (const system_error&)
+  {
+  }
+
+  // Write text2 over text1.
+  //
+  to_file (f, text2);
+  string s (text2);
+  s += string (text1, text2.size ());
+  assert (from_file (f) == s);
+
+  // Truncate before reading.
+  //
+  assert (from_file (f, fdopen_mode::out | fdopen_mode::truncate) == "");
+
+  // Append to the file.
+  //
+  to_file (f, text1, fdopen_mode::truncate);
+  to_file (f, text2, fdopen_mode::append);
+  assert (from_file (f) == text1 + text2);
+
+#ifndef _WIN32
+
+  // Fail for an existing symlink to unexistent file.
+  //
+  path link (td / path ("link"));
+  mksymlink (td / path ("unexistent"), link);
+
+  try
+  {
+    fdopen (
+      link, fdopen_mode::out | fdopen_mode::create | fdopen_mode::exclusive);
+
+    assert (false);
+  }
+  catch (const system_error&)
+  {
+  }
+
+#else
+
+  // Check translation modes.
+  //
+  to_file (f, text1, fdopen_mode::truncate);
+  assert (from_file (f, fdopen_mode::binary) == text3);
+
+  to_file (f, text3, fdopen_mode::truncate | fdopen_mode::binary);
+  assert (from_file (f) == text1);
+
+#endif
+
+  rmdir_r (td);
+}