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// 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);
}
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