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configfile.cpp
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configfile.cpp
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//===-- configfile.cpp ----------------------------------------------------===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the BSD-style LDC license. See the LICENSE
// file for details.
//
//===----------------------------------------------------------------------===//
#include "driver/configfile.h"
#include "driver/exe_path.h"
#include "mars.h"
#include "libconfig.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include <cassert>
#include <cstring>
#include <iostream>
#include <string>
#if _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <shlobj.h>
// Prevent name clash with LLVM
#undef GetCurrentDirectory
#endif
namespace sys = llvm::sys;
#if LDC_LLVM_VER >= 304
#if _WIN32
std::string getUserHomeDirectory() {
char buff[MAX_PATH];
HRESULT res = SHGetFolderPathA(NULL,
CSIDL_FLAG_CREATE | CSIDL_APPDATA,
NULL,
SHGFP_TYPE_CURRENT,
buff);
if (res != S_OK)
assert(0 && "Failed to get user home directory");
return buff;
}
#else
std::string getUserHomeDirectory() {
const char* home = getenv("HOME");
return home ? home : "/";
}
#endif
#else
std::string getUserHomeDirectory() {
return llvm::sys::Path::GetUserHomeDirectory().str();
}
#endif
#if _WIN32
static bool ReadPathFromRegistry(llvm::SmallString<128> &p)
{
HKEY hkey;
bool res = false;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,
"SOFTWARE\\ldc-developers\\LDC\\0.11.0", //FIXME Version number should be a define
NULL, KEY_QUERY_VALUE, &hkey) == ERROR_SUCCESS)
{
DWORD length;
if (RegGetValue(hkey, NULL, "Path", RRF_RT_REG_SZ, NULL, NULL, &length) == ERROR_SUCCESS)
{
char *data = static_cast<char *>(_alloca(length));
if (RegGetValue(hkey, NULL, "Path", RRF_RT_REG_SZ, NULL, data, &length) == ERROR_SUCCESS)
{
p = std::string(data);
res = true;
}
}
RegCloseKey(hkey);
}
return res;
}
#endif
ConfigFile::ConfigFile()
{
cfg = new config_t;
config_init(cfg);
}
ConfigFile::~ConfigFile()
{
// delete cfg;
}
bool ConfigFile::locate(llvm::SmallString<128>& p, const char* filename)
{
// temporary configuration
// try the current working dir
if (!sys::fs::current_path(p))
{
sys::path::append(p, filename);
if (sys::fs::exists(p.str()))
return true;
}
// try next to the executable
p = exe_path::prependBinDir(filename);
if (sys::fs::exists(p.str()))
return true;
// user configuration
// try ~/.ldc
p = getUserHomeDirectory();
sys::path::append(p, ".ldc");
sys::path::append(p, filename);
if (sys::fs::exists(p.str()))
return true;
#if _WIN32
// try home dir
p = getUserHomeDirectory();
sys::path::append(p, filename);
if (sys::fs::exists(p.str()))
return true;
#endif
// system configuration
// try in etc relative to the executable: exe\..\etc
// do not use .. in path because of security risks
p = exe_path::getBaseDir();
if (!p.empty())
{
sys::path::append(p, "etc");
sys::path::append(p, filename);
if (sys::fs::exists(p.str()))
return true;
}
#if _WIN32
// Try reading path from registry
if (ReadPathFromRegistry(p))
{
sys::path::append(p, "etc");
sys::path::append(p, filename);
if (sys::fs::exists(p.str()))
return true;
}
#else
// try the install-prefix/etc
p = LDC_INSTALL_PREFIX;
sys::path::append(p, "etc");
sys::path::append(p, filename);
if (sys::fs::exists(p.str()))
return true;
// try the install-prefix/etc/ldc
p = LDC_INSTALL_PREFIX;
sys::path::append(p, "etc");
sys::path::append(p, "ldc");
sys::path::append(p, filename);
if (sys::fs::exists(p.str()))
return true;
// try /etc (absolute path)
p = "/etc";
sys::path::append(p, filename);
if (sys::fs::exists(p.str()))
return true;
// try /etc/ldc (absolute path)
p = "/etc/ldc";
sys::path::append(p, filename);
if (sys::fs::exists(p.str()))
return true;
#endif
return false;
}
bool ConfigFile::read(const char* filename)
{
llvm::SmallString<128> p;
if (!locate(p, filename))
{
// failed to find cfg, users still have the DFLAGS environment var
std::cerr << "Error failed to locate the configuration file: " << filename << std::endl;
return false;
}
// save config file path for -v output
pathstr = p.str();
// read the cfg
if (!config_read_file(cfg, p.c_str()))
{
std::cerr << "error reading configuration file" << std::endl;
return false;
}
// make sure there's a default group
config_setting_t *root = config_lookup(cfg, "default");
if (!root)
{
std::cerr << "no default settings in configuration file" << std::endl;
return false;
}
if (!config_setting_is_group(root))
{
std::cerr << "default is not a group" << std::endl;
return false;
}
// handle switches
if (config_setting_t *sw = config_setting_get_member(root, "switches"))
{
std::string binpathkey = "%%ldcbinarypath%%";
std::string binpath = exe_path::getBinDir();
int len = config_setting_length(sw);
for (int i = 0; i < len; i++)
{
std::string v(config_setting_get_string(config_setting_get_elem(sw, i)));
// replace binpathkey with binpath
size_t p;
while (std::string::npos != (p = v.find(binpathkey)))
v.replace(p, binpathkey.size(), binpath);
switches.push_back(strdup(v.c_str()));
}
}
return true;
}