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/************************************************************************
************************************************************************
FAUST compiler
Copyright (C) 2003-2018 GRAME, Centre National de Creation Musicale
---------------------------------------------------------------------
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
************************************************************************
************************************************************************/
#include <array>
#include <cstdio>
#include <memory>
#include <regex>
#include <sstream>
#include <string>
#ifdef WIN32
#include <windows.h>
#else
#include <libgen.h>
#include <unistd.h>
#define GetCurrentDir getcwd
#endif
#include "exepath.hh"
using namespace std;
#ifdef WIN32
#define kPSEP '\\'
#else
#define kPSEP '/'
#endif
//-----------------------------------------------------------------
// removes the exe name from a path (similar to dirname)
string exepath::dirup(const string& path)
{
if (path.empty()) return path;
size_t len = path.length();
size_t pos = path.rfind(kPSEP, len - 2);
if (pos == string::npos) return "";
string out = path.substr(0, pos);
return out == "." ? "" : out;
}
#ifndef EMCC
//-----------------------------------------------------------------
// recursively removes expressions like /a_name/.. from a path
string exepath::stripPath(const string& path)
{
regex e("/[^/]*/\\.\\."); // matches sequence like /path/..
string stripped = regex_replace(path, e, "");
if (stripped == path) return path;
return stripPath(stripped);
}
#ifdef WIN32
//-----------------------------------------------------------------
string exepath::resolvelink(const string& path)
{
return path;
}
#else
//-----------------------------------------------------------------
string exepath::resolvelink(const string& path)
{
char buff[FILENAME_MAX + 1];
ssize_t n = readlink(path.c_str(), buff, FILENAME_MAX);
if (n > 0) {
buff[n] = 0;
bool relative = (buff[0] != '/');
if (relative) { // this is a relative link
string tmp = dirup(path);
if (tmp[0] == '/') return stripPath(tmp + "/" + buff);
return relative2absolute(buff);
}
return buff;
}
return "";
}
#endif
#ifdef WIN32
//-----------------------------------------------------------------
string exepath::get(const string& name)
{
char buff[1024];
DWORD n = GetModuleFileNameA(0, buff, 1024);
return n ? dirup(buff) : "";
}
#else
//-----------------------------------------------------------------
// exec any command and get the result from a pipe
static std::string exec(const string& cmd)
{
std::array<char, FILENAME_MAX> buffer;
std::string result;
std::shared_ptr<FILE> pipe(popen(cmd.c_str(), "r"), pclose);
if (!pipe) return "";
while (!feof(pipe.get())) {
if (fgets(buffer.data(), FILENAME_MAX, pipe.get()) != nullptr) result += buffer.data();
}
return result;
}
static string GetCurrentWorkingDir()
{
char buff[FILENAME_MAX];
return GetCurrentDir(buff, FILENAME_MAX) ? buff : "";
}
//-----------------------------------------------------------------
string exepath::relative2absolute(const string& path)
{
if (path[0] == kPSEP) return path;
string pwd = GetCurrentWorkingDir();
// the next line removes the form "./"
string tmp = (path[1] == kPSEP) ? path.substr(2) : path;
return stripPath(pwd + kPSEP + tmp);
}
//-----------------------------------------------------------------
string exepath::get(const string& argv0)
{
#ifdef WIN32
if (argv0[1] == ':') { // with msys, argv[0] is the full path name
string path = dirup(argv0);
return (path.back() != kPSEP) ? path + kPSEP : path;
}
#endif
string which;
if ((argv0[0] == '.') || (argv0.find('/') != string::npos)) {
// app call is relative to the current location
which = relative2absolute(argv0);
} else {
stringstream cmd;
cmd << "which " << argv0;
which = exec(cmd.str());
if (which.empty()) return "";
if (which.back() == '\n') which.pop_back();
}
string target = resolvelink(which);
if (!target.empty()) {
which = target;
}
string path = dirup(which);
return (path.back() != kPSEP) ? path + kPSEP : path;
}
#endif
#endif
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