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// file : butl/path.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <butl/path>
#ifdef _WIN32
# include <stdlib.h> // _MAX_PATH
# include <direct.h> // _[w]getcwd(), _[w]chdir()
#else
# include <errno.h> // EINVAL
# include <stdlib.h> // mbstowcs(), wcstombs(), realpath()
# include <limits.h> // PATH_MAX
# include <unistd.h> // getcwd(), chdir()
#endif
#include <cassert>
#include <system_error>
#ifndef _WIN32
# ifndef PATH_MAX
# define PATH_MAX 4096
# endif
#endif
using namespace std;
namespace butl
{
char const* invalid_path_base::
what () const throw ()
{
return "invalid filesystem path";
}
//
// char
//
template <>
path_traits<char>::string_type path_traits<char>::
current ()
{
// @@ throw system_error (and in the other current() versions).
#ifdef _WIN32
char cwd[_MAX_PATH];
if(_getcwd (cwd, _MAX_PATH) == 0)
throw system_error (errno, system_category ());
#else
char cwd[PATH_MAX];
if (getcwd (cwd, PATH_MAX) == 0)
throw system_error (errno, system_category ());
#endif
return string_type (cwd);
}
template <>
void path_traits<char>::
current (string_type const& s)
{
#ifdef _WIN32
if(_chdir (s.c_str ()) != 0)
throw system_error (errno, system_category ());
#else
if (chdir (s.c_str ()) != 0)
throw system_error (errno, system_category ());
#endif
}
#ifndef _WIN32
template <>
void path_traits<char>::
realize (string_type& s)
{
char r[PATH_MAX];
if (realpath (s.c_str (), r) == nullptr)
{
// @@ If there were a message in invalid_basic_path, we could have said
// what exactly is wrong with the path.
//
if (errno == EACCES || errno == ENOENT || errno == ENOTDIR)
throw invalid_basic_path<char> (s);
else
throw system_error (errno, system_category ());
}
s = r;
}
#endif
//
// wchar_t
//
template <>
path_traits<wchar_t>::string_type path_traits<wchar_t>::
current ()
{
#ifdef _WIN32
wchar_t wcwd[_MAX_PATH];
if(_wgetcwd (wcwd, _MAX_PATH) == 0)
throw system_error (errno, system_category ());
#else
char cwd[PATH_MAX];
if (getcwd (cwd, PATH_MAX) == 0)
throw system_error (errno, system_category ());
wchar_t wcwd[PATH_MAX];
if (mbstowcs (wcwd, cwd, PATH_MAX) == size_type (-1))
throw system_error (EINVAL, system_category ());
#endif
return string_type (wcwd);
}
template <>
void path_traits<wchar_t>::
current (string_type const& s)
{
#ifdef _WIN32
if(_wchdir (s.c_str ()) != 0)
throw system_error (errno, system_category ());
#else
char ns[PATH_MAX + 1];
if (wcstombs (ns, s.c_str (), PATH_MAX) == size_type (-1))
throw system_error (EINVAL, system_category ());
ns[PATH_MAX] = '\0';
if (chdir (ns) != 0)
throw system_error (errno, system_category ());
#endif
}
#ifndef _WIN32
template <>
void path_traits<wchar_t>::
realize (string_type&)
{
assert (false); // Implement if/when needed.
}
#endif
}
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