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 //
 // ********************************************************************
 // * License and Disclaimer                                           *
 // *                                                                  *
 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
 // * conditions of the Geant4 Software License,  included in the file *
 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
 // * include a list of copyright holders.                             *
 // *                                                                  *
 // * Neither the authors of this software system, nor their employing *
 // * institutes,nor the agencies providing financial support for this *
 // * work  make  any representation or  warranty, express or implied, *
 // * regarding  this  software system or assume any liability for its *
 // * use.  Please see the license in the file  LICENSE  and URL above *
 // * for the full disclaimer and the limitation of liability.         *
 // *                                                                  *
 // * This  code  implementation is the result of  the  scientific and *
 // * technical work of the GEANT4 collaboration.                      *
 // * By using,  copying,  modifying or  distributing the software (or *
 // * any work based  on the software)  you  agree  to acknowledge its *
 // * use  in  resulting  scientific  publications,  and indicate your *
 // * acceptance of all terms of the Geant4 Software license.          *
 // ********************************************************************
 //
 #include "UtilityFunctions.hh"
 
 #include <cstdio>
 #include <memory>
 
 #ifdef WIN32
 #  include <direct.h>
 #else
 #  include <unistd.h>
 #endif
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
 namespace utility
 {
 std::vector<G4String>& Split(const G4String& str, char delim, std::vector<G4String>& elems)
 {
   std::stringstream ss(str);
   std::string item;
   while (std::getline(ss, item, delim)) {
     if (!item.empty()) elems.push_back((G4String)item);
   }
   return elems;
 }
 
 std::vector<G4String> Split(const G4String& str, char delim)
 {
   std::vector<G4String> elems;
   Split(str, delim, elems);
   return elems;
 }
 
 // return element ii
 G4String Get_seperated_element(const G4String& str, char delim, G4int ii)
 {
   G4int delims = 0;
   G4String ss;
   for (char c : str) {
     if (delims > ii) {
       return ss;
     }
     if (c == delim) {
       delims++;
     }
     else if (delims == ii) {
       ss += c;
     }
   }
   return ss;
 }
 
 // return first four strings
 std::array<G4String, 4> Get_four_elements(const G4String& str, char delim)
 {
   G4int delims = 0;
   std::array<G4String, 4> arr;
   for (char c : str) {
     if (delims >= 4) return arr;
     if (c == delim)
       delims++;
     else
       arr.at(delims) += c;
   }
   return arr;
 }
 
 G4bool Path_exists(const G4String& fname)
 {
   G4bool bool_val = false;
   if (FILE* file = std::fopen(fname, "r")) {
     fclose(file);
     bool_val = true;
   }
   return bool_val;
 }
 
 // Memory safe multi-platform getcwd
 // http://stackoverflow.com/questions/2869594/
 G4String Getcwd()
 {
   const size_t chunkSize = 255;
   const int maxChunks = 10240;  // 2550 KiBs of current path is plenty
 
   char stackBuffer[chunkSize];  // Stack buffer for the "normal" case
   if (::getcwd(stackBuffer, sizeof(stackBuffer)) != nullptr) return stackBuffer;
   if (errno != ERANGE) {
     // It's not ERANGE, so we don't know how to handle it
     throw std::runtime_error("Cannot determine the current path.");
     // Of course you may choose a different error reporting method
   }
   // Ok, the stack buffer isn't long enough; fallback to heap allocation
   for (int chunks = 2; chunks < maxChunks; chunks++) {
     // With boost use scoped_ptr; in C++0x, use unique_ptr
     // If you want to be less C++ but more efficient
     // you may want to use realloc
     std::unique_ptr<char[]> cwd(new char[chunkSize * chunks]);
     if (::getcwd(cwd.get(), chunkSize * chunks) != nullptr) return cwd.get();
     if (errno != ERANGE) {
       // It's not ERANGE, so we don't know how to handle it
       throw std::runtime_error("Cannot determine the current path.");
       // Of course you may choose a different error reporting method
     }
   }
   throw std::runtime_error(
     "Cannot determine the current path; the path is "
     "apparently unreasonably long");
 }
 
 G4double Min(const G4ThreeVector& v)
 {
   return std::min(std::min(v.x(), v.y()), v.z());
 }
 }  // namespace utility
 
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