CMake/Source/kwsys/SystemTools.cxx

/*============================================================================
  KWSys - Kitware System Library
  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/

#ifdef __osf__
#  define _OSF_SOURCE
#  define _POSIX_C_SOURCE 199506L
#  define _XOPEN_SOURCE_EXTENDED
#endif

#include "kwsysPrivate.h"
#include KWSYS_HEADER(RegularExpression.hxx)
#include KWSYS_HEADER(SystemTools.hxx)
#include KWSYS_HEADER(Directory.hxx)

#include KWSYS_HEADER(ios/iostream)
#include KWSYS_HEADER(ios/fstream)
#include KWSYS_HEADER(ios/sstream)

#include KWSYS_HEADER(stl/set)

// Work-around CMake dependency scanning limitation.  This must
// duplicate the above list of headers.
#if 0
# include "SystemTools.hxx.in"
# include "Directory.hxx.in"
# include "kwsys_ios_iostream.h.in"
# include "kwsys_ios_fstream.h.in"
# include "kwsys_ios_sstream.h.in"
#endif

#ifdef _MSC_VER
# pragma warning (disable: 4786)
#endif

#if defined(__sgi) && !defined(__GNUC__)
# pragma set woff 1375 /* base class destructor not virtual */
#endif

#include <ctype.h>
#include <errno.h>
#ifdef __QNX__
# include <malloc.h> /* for malloc/free on QNX */
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>

// support for realpath call
#ifndef _WIN32
#include <sys/time.h>
#include <utime.h>
#include <limits.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <pwd.h>
#ifndef __VMS
#include <sys/param.h>
#include <termios.h>
#endif
#include <signal.h>    /* sigprocmask */
#endif

// Windows API.
#if defined(_WIN32)
# include <windows.h>
#elif defined (__CYGWIN__)
# include <windows.h>
# undef _WIN32
#endif

#if !KWSYS_CXX_HAS_ENVIRON_IN_STDLIB_H
extern char **environ;
#endif

#ifdef __CYGWIN__
extern "C" void cygwin_conv_to_win32_path(const char *path, char *win32_path);
#endif

// getpwnam doesn't exist on Windows and Cray Xt3/Catamount
// same for TIOCGWINSZ
#if defined(_WIN32) || defined (__LIBCATAMOUNT__)
# undef HAVE_GETPWNAM
# undef HAVE_TTY_INFO
#else
# define HAVE_GETPWNAM 1
# define HAVE_TTY_INFO 1
#endif

#define VTK_URL_PROTOCOL_REGEX "([a-zA-Z0-9]*)://(.*)"
#define VTK_URL_REGEX "([a-zA-Z0-9]*)://(([A-Za-z0-9]+)(:([^:@]+))?@)?([^:@/]+)(:([0-9]+))?/(.+)?"

#ifdef _MSC_VER
#include <sys/utime.h>
#else
#include <utime.h>
#endif


// This is a hack to prevent warnings about these functions being
// declared but not referenced.
#if defined(__sgi) && !defined(__GNUC__)
# include <sys/termios.h>
namespace KWSYS_NAMESPACE
{
class SystemToolsHack
{
public:
  enum
  {
    Ref1 = sizeof(cfgetospeed(0)),
    Ref2 = sizeof(cfgetispeed(0)),
    Ref3 = sizeof(tcgetattr(0, 0)),
    Ref4 = sizeof(tcsetattr(0, 0, 0)),
    Ref5 = sizeof(cfsetospeed(0,0)),
    Ref6 = sizeof(cfsetispeed(0,0))
  };
};
}
#endif

#if defined(_WIN32) && (defined(_MSC_VER) || defined(__WATCOMC__) ||defined(__BORLANDC__) || defined(__MINGW32__))
#include <io.h>
#include <direct.h>
#define _unlink unlink
#endif

/* The maximum length of a file name.  */
#if defined(PATH_MAX)
# define KWSYS_SYSTEMTOOLS_MAXPATH PATH_MAX
#elif defined(MAXPATHLEN)
# define KWSYS_SYSTEMTOOLS_MAXPATH MAXPATHLEN
#else
# define KWSYS_SYSTEMTOOLS_MAXPATH 16384
#endif
#if defined(__WATCOMC__)
#include <direct.h>
#define _mkdir mkdir
#define _rmdir rmdir
#define _getcwd getcwd
#define _chdir chdir
#endif

#if defined(__HAIKU__)
#include <os/kernel/OS.h>
#include <os/storage/Path.h>
#endif

#if defined(__BEOS__) && !defined(__ZETA__)
#include <be/kernel/OS.h>
#include <be/storage/Path.h>

// BeOS 5 doesn't have usleep(), but it has snooze(), which is identical.
static inline void usleep(unsigned int msec)
{
  ::snooze(msec);
}

// BeOS 5 also doesn't have realpath(), but its C++ API offers something close.
static inline char *realpath(const char *path, char *resolved_path)
{
  const size_t maxlen = KWSYS_SYSTEMTOOLS_MAXPATH;
  snprintf(resolved_path, maxlen, "%s", path);
  BPath normalized(resolved_path, NULL, true);
  const char *resolved = normalized.Path();
  if (resolved != NULL)   // NULL == No such file.
    {
    if (snprintf(resolved_path, maxlen, "%s", resolved) < maxlen)
      {
      return resolved_path;
      }
    }
  return NULL;   // something went wrong.
}
#endif

#if defined(_WIN32) && (defined(_MSC_VER) || defined(__WATCOMC__) || defined(__BORLANDC__) || defined(__MINGW32__))
inline int Mkdir(const char* dir)
{
  return _mkdir(dir);
}
inline int Rmdir(const char* dir)
{
  return _rmdir(dir);
}
inline const char* Getcwd(char* buf, unsigned int len)
{
  if(const char* ret = _getcwd(buf, len))
    {
    // make sure the drive letter is capital
    if(strlen(buf) > 1 && buf[1] == ':')
      {
      buf[0] = toupper(buf[0]);
      }
    return ret;
    }
  return 0;
}
inline int Chdir(const char* dir)
{
  #if defined(__BORLANDC__)
  return chdir(dir);
  #else
  return _chdir(dir);
  #endif
}
inline void Realpath(const char *path, kwsys_stl::string & resolved_path)
{
  char *ptemp;
  char fullpath[MAX_PATH];
  if( GetFullPathName(path, sizeof(fullpath), fullpath, &ptemp) )
    {
    resolved_path = fullpath;
    KWSYS_NAMESPACE::SystemTools::ConvertToUnixSlashes(resolved_path);
    }
  else
    {
    resolved_path = path;
    }
}
#else
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
inline int Mkdir(const char* dir)
{
  return mkdir(dir, 00777);
}
inline int Rmdir(const char* dir)
{
  return rmdir(dir);
}
inline const char* Getcwd(char* buf, unsigned int len)
{
  return getcwd(buf, len);
}

inline int Chdir(const char* dir)
{
  return chdir(dir);
}
inline void Realpath(const char *path, kwsys_stl::string & resolved_path)
{
  char resolved_name[KWSYS_SYSTEMTOOLS_MAXPATH];

  char *ret = realpath(path, resolved_name);
  if(ret)
    {
    resolved_path = ret;
    }
  else
    {
    // if path resolution fails, return what was passed in
    resolved_path = path;
    }
}
#endif

#if !defined(_WIN32) && defined(__COMO__)
// Hack for como strict mode to avoid defining _SVID_SOURCE or _BSD_SOURCE.
extern "C"
{
extern FILE *popen (__const char *__command, __const char *__modes) __THROW;
extern int pclose (FILE *__stream) __THROW;
extern char *realpath (__const char *__restrict __name,
                       char *__restrict __resolved) __THROW;
extern char *strdup (__const char *__s) __THROW;
extern int putenv (char *__string) __THROW;
}
#endif

namespace KWSYS_NAMESPACE
{

double SystemTools::GetTime(void)
{
#if defined(_WIN32) && !defined(__CYGWIN__)
  FILETIME ft;
  GetSystemTimeAsFileTime(&ft);
  return (429.4967296*ft.dwHighDateTime
          + 0.0000001*ft.dwLowDateTime
          - 11644473600.0);
#else
  struct timeval t;
  gettimeofday(&t, 0);
  return 1.0*double(t.tv_sec) + 0.000001*double(t.tv_usec);
#endif
}

class SystemToolsTranslationMap :
    public kwsys_stl::map<kwsys_stl::string,kwsys_stl::string>
{
};

// adds the elements of the env variable path to the arg passed in
void SystemTools::GetPath(kwsys_stl::vector<kwsys_stl::string>& path, const char* env)
{
#if defined(_WIN32) && !defined(__CYGWIN__)
  const char* pathSep = ";";
#else
  const char* pathSep = ":";
#endif
  if(!env)
    {
    env = "PATH";
    }
  const char* cpathEnv = SystemTools::GetEnv(env);
  if ( !cpathEnv )
    {
    return;
    }

  kwsys_stl::string pathEnv = cpathEnv;

  // A hack to make the below algorithm work.
  if(!pathEnv.empty() && pathEnv[pathEnv.length()-1] != pathSep[0])
    {
    pathEnv += pathSep;
    }
  kwsys_stl::string::size_type start =0;
  bool done = false;
  while(!done)
    {
    kwsys_stl::string::size_type endpos = pathEnv.find(pathSep, start);
    if(endpos != kwsys_stl::string::npos)
      {
      path.push_back(pathEnv.substr(start, endpos-start));
      start = endpos+1;
      }
    else
      {
      done = true;
      }
    }
  for(kwsys_stl::vector<kwsys_stl::string>::iterator i = path.begin();
      i != path.end(); ++i)
    {
    SystemTools::ConvertToUnixSlashes(*i);
    }
}

const char* SystemTools::GetEnv(const char* key)
{
  return getenv(key);
}

bool SystemTools::GetEnv(const char* key, kwsys_stl::string& result)
{
  const char* v = getenv(key);
  if(v)
    {
    result = v;
    return true;
    }
  else
    {
    return false;
    }
}

//----------------------------------------------------------------------------

#if defined(__CYGWIN__) || defined(__GLIBC__)
# define KWSYS_PUTENV_NAME  /* putenv("A")  removes A.  */
#elif defined(_WIN32)
# define KWSYS_PUTENV_EMPTY /* putenv("A=") removes A. */
#endif

#if KWSYS_CXX_HAS_UNSETENV
/* unsetenv("A") removes A from the environment.
   On older platforms it returns void instead of int.  */
static int kwsysUnPutEnv(const char* env)
{
  if(const char* eq = strchr(env, '='))
    {
    std::string name(env, eq-env);
    unsetenv(name.c_str());
    }
  else
    {
    unsetenv(env);
    }
  return 0;
}

#elif defined(KWSYS_PUTENV_EMPTY) || defined(KWSYS_PUTENV_NAME)
/* putenv("A=") or putenv("A") removes A from the environment.  */
static int kwsysUnPutEnv(const char* env)
{
  int err = 0;
  const char* eq = strchr(env, '=');
  size_t const len = eq? (size_t)(eq-env) : strlen(env);
# ifdef KWSYS_PUTENV_EMPTY
  size_t const sz = len + 2;
# else
  size_t const sz = len + 1;
# endif
  char local_buf[256];
  char* buf = sz > sizeof(local_buf) ? (char*)malloc(sz) : local_buf;
  if(!buf)
    {
    return -1;
    }
  strncpy(buf, env, len);
# ifdef KWSYS_PUTENV_EMPTY
  buf[len] = '=';
  buf[len+1] = 0;
  if(putenv(buf) < 0)
    {
    err = errno;
    }
# else
  buf[len] = 0;
  if(putenv(buf) < 0 && errno != EINVAL)
    {
    err = errno;
    }
# endif
  if(buf != local_buf)
    {
    free(buf);
    }
  if(err)
    {
    errno = err;
    return -1;
    }
  return 0;
}

#else
/* Manipulate the "environ" global directly.  */
static int kwsysUnPutEnv(const char* env)
{
  const char* eq = strchr(env, '=');
  size_t const len = eq? (size_t)(eq-env) : strlen(env);
  int in = 0;
  int out = 0;
  while(environ[in])
    {
    if(strlen(environ[in]) > len &&
       environ[in][len] == '=' &&
       strncmp(env, environ[in], len) == 0)
      {
      ++in;
      }
    else
      {
      environ[out++] = environ[in++];
      }
    }
  while(out < in)
    {
    environ[out++] = 0;
    }
  return 0;
}
#endif

//----------------------------------------------------------------------------

#if KWSYS_CXX_HAS_SETENV

/* setenv("A", "B", 1) will set A=B in the environment and makes its
   own copies of the strings.  */
bool SystemTools::PutEnv(const char* env)
{
  if(const char* eq = strchr(env, '='))
    {
    std::string name(env, eq-env);
    return setenv(name.c_str(), eq+1, 1) == 0;
    }
  else
    {
    return kwsysUnPutEnv(env) == 0;
    }
}

bool SystemTools::UnPutEnv(const char* env)
{
  return kwsysUnPutEnv(env) == 0;
}

#else

/* putenv("A=B") will set A=B in the environment.  Most putenv implementations
   put their argument directly in the environment.  They never free the memory
   on program exit.  Keep an active set of pointers to memory we allocate and
   pass to putenv, one per environment key.  At program exit remove any
   environment values that may still reference memory we allocated.  Then free
   the memory.  This will not affect any environment values we never set.  */

# ifdef __INTEL_COMPILER
#  pragma warning disable 444 /* base has non-virtual destructor */
# endif

/* Order by environment key only (VAR from VAR=VALUE).  */
struct kwsysEnvCompare
{
  bool operator() (const char* l, const char* r) const
    {
    const char* leq = strchr(l, '=');
    const char* req = strchr(r, '=');
    size_t llen = leq? (leq-l) : strlen(l);
    size_t rlen = req? (req-r) : strlen(r);
    if(llen == rlen)
      {
      return strncmp(l,r,llen) < 0;
      }
    else
      {
      return strcmp(l,r) < 0;
      }
    }
};

class kwsysEnv: public kwsys_stl::set<const char*, kwsysEnvCompare>
{
  class Free
  {
    const char* Env;
  public:
    Free(const char* env): Env(env) {}
    ~Free() { free(const_cast<char*>(this->Env)); }
  };
public:
  typedef kwsys_stl::set<const char*, kwsysEnvCompare> derived;
  ~kwsysEnv()
    {
    for(derived::iterator i = this->begin(); i != this->end(); ++i)
      {
      kwsysUnPutEnv(*i);
      free(const_cast<char*>(*i));
      }
    }
  const char* Release(const char* env)
    {
    const char* old = 0;
    derived::iterator i = this->find(env);
    if(i != this->end())
      {
      old = *i;
      this->erase(i);
      }
    return old;
    }
  bool Put(const char* env)
    {
    Free oldEnv(this->Release(env));
    static_cast<void>(oldEnv);
    char* newEnv = strdup(env);
    this->insert(newEnv);
    return putenv(newEnv) == 0;
    }
  bool UnPut(const char* env)
    {
    Free oldEnv(this->Release(env));
    static_cast<void>(oldEnv);
    return kwsysUnPutEnv(env) == 0;
    }
};

static kwsysEnv kwsysEnvInstance;

bool SystemTools::PutEnv(const char* env)
{
  return kwsysEnvInstance.Put(env);
}

bool SystemTools::UnPutEnv(const char* env)
{
  return kwsysEnvInstance.UnPut(env);
}

#endif

//----------------------------------------------------------------------------

const char* SystemTools::GetExecutableExtension()
{
#if defined(_WIN32) || defined(__CYGWIN__) || defined(__VMS)
  return ".exe";
#else
  return "";
#endif
}


bool SystemTools::MakeDirectory(const char* path)
{
  if(!path)
    {
    return false;
    }
  if(SystemTools::FileExists(path))
    {
    return true;
    }
  kwsys_stl::string dir = path;
  if(dir.size() == 0)
    {
    return false;
    }
  SystemTools::ConvertToUnixSlashes(dir);

  kwsys_stl::string::size_type pos = 0;
  kwsys_stl::string topdir;
  while((pos = dir.find('/', pos)) != kwsys_stl::string::npos)
    {
    topdir = dir.substr(0, pos);
    Mkdir(topdir.c_str());
    pos++;
    }
  topdir = dir;
  if(Mkdir(topdir.c_str()) != 0)
    {
    // There is a bug in the Borland Run time library which makes MKDIR
    // return EACCES when it should return EEXISTS
    // if it is some other error besides directory exists
    // then return false
    if( (errno != EEXIST)
#ifdef __BORLANDC__
        && (errno != EACCES)
#endif
      )
      {
      return false;
      }
    }
  return true;
}


// replace replace with with as many times as it shows up in source.
// write the result into source.
void SystemTools::ReplaceString(kwsys_stl::string& source,
                                   const char* replace,
                                   const char* with)
{
  const char *src = source.c_str();
  char *searchPos = const_cast<char *>(strstr(src,replace));

  // get out quick if string is not found
  if (!searchPos)
    {
    return;
    }

  // perform replacements until done
  size_t replaceSize = strlen(replace);
  // do while hangs if replaceSize is 0
  if(replaceSize == 0)
    {
    return;
    }
  char *orig = strdup(src);
  char *currentPos = orig;
  searchPos = searchPos - src + orig;

  // initialize the result
  source.erase(source.begin(),source.end());
  do
    {
    *searchPos = '\0';
    source += currentPos;
    currentPos = searchPos + replaceSize;
    // replace
    source += with;
    searchPos = strstr(currentPos,replace);
    }
  while (searchPos);

  // copy any trailing text
  source += currentPos;
  free(orig);
}

#if defined(KEY_WOW64_32KEY) && defined(KEY_WOW64_64KEY)
# define KWSYS_ST_KEY_WOW64_32KEY KEY_WOW64_32KEY
# define KWSYS_ST_KEY_WOW64_64KEY KEY_WOW64_64KEY
#else
# define KWSYS_ST_KEY_WOW64_32KEY 0x0200
# define KWSYS_ST_KEY_WOW64_64KEY 0x0100
#endif

#if defined(_WIN32) && !defined(__CYGWIN__)
static DWORD SystemToolsMakeRegistryMode(DWORD mode,
                                         SystemTools::KeyWOW64 view)
{
  // only add the modes when on a system that supports Wow64.
  static FARPROC wow64p = GetProcAddress(GetModuleHandle("kernel32"),
                                         "IsWow64Process");
  if(wow64p == NULL)
    {
    return mode;
    }

  if(view == SystemTools::KeyWOW64_32)
    {
    return mode | KWSYS_ST_KEY_WOW64_32KEY;
    }
  else if(view == SystemTools::KeyWOW64_64)
    {
    return mode | KWSYS_ST_KEY_WOW64_64KEY;
    }
  return mode;
}
#endif

// Read a registry value.
// Example :
//      HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\2.1\InstallPath
//      =>  will return the data of the "default" value of the key
//      HKEY_LOCAL_MACHINE\SOFTWARE\Scriptics\Tcl\8.4;Root
//      =>  will return the data of the "Root" value of the key

#if defined(_WIN32) && !defined(__CYGWIN__)
bool SystemTools::ReadRegistryValue(const char *key, kwsys_stl::string &value,
                                    KeyWOW64 view)
{
  bool valueset = false;
  kwsys_stl::string primary = key;
  kwsys_stl::string second;
  kwsys_stl::string valuename;

  size_t start = primary.find("\\");
  if (start == kwsys_stl::string::npos)
    {
    return false;
    }

  size_t valuenamepos = primary.find(";");
  if (valuenamepos != kwsys_stl::string::npos)
    {
    valuename = primary.substr(valuenamepos+1);
    }

  second = primary.substr(start+1, valuenamepos-start-1);
  primary = primary.substr(0, start);

  HKEY primaryKey = HKEY_CURRENT_USER;
  if (primary == "HKEY_CURRENT_USER")
    {
    primaryKey = HKEY_CURRENT_USER;
    }
  if (primary == "HKEY_CURRENT_CONFIG")
    {
    primaryKey = HKEY_CURRENT_CONFIG;
    }
  if (primary == "HKEY_CLASSES_ROOT")
    {
    primaryKey = HKEY_CLASSES_ROOT;
    }
  if (primary == "HKEY_LOCAL_MACHINE")
    {
    primaryKey = HKEY_LOCAL_MACHINE;
    }
  if (primary == "HKEY_USERS")
    {
    primaryKey = HKEY_USERS;
    }

  HKEY hKey;
  if(RegOpenKeyEx(primaryKey,
                  second.c_str(),
                  0,
                  SystemToolsMakeRegistryMode(KEY_READ, view),
                  &hKey) != ERROR_SUCCESS)
    {
    return false;
    }
  else
    {
    DWORD dwType, dwSize;
    dwSize = 1023;
    char data[1024];
    if(RegQueryValueEx(hKey,
                       (LPTSTR)valuename.c_str(),
                       NULL,
                       &dwType,
                       (BYTE *)data,
                       &dwSize) == ERROR_SUCCESS)
      {
      if (dwType == REG_SZ)
        {
        value = data;
        valueset = true;
        }
      else if (dwType == REG_EXPAND_SZ)
        {
        char expanded[1024];
        DWORD dwExpandedSize = sizeof(expanded)/sizeof(expanded[0]);
        if(ExpandEnvironmentStrings(data, expanded, dwExpandedSize))
          {
          value = expanded;
          valueset = true;
          }
        }
      }

    RegCloseKey(hKey);
    }

  return valueset;
}
#else
bool SystemTools::ReadRegistryValue(const char *, kwsys_stl::string &,
                                    KeyWOW64)
{
  return false;
}
#endif


// Write a registry value.
// Example :
//      HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\2.1\InstallPath
//      =>  will set the data of the "default" value of the key
//      HKEY_LOCAL_MACHINE\SOFTWARE\Scriptics\Tcl\8.4;Root
//      =>  will set the data of the "Root" value of the key

#if defined(_WIN32) && !defined(__CYGWIN__)
bool SystemTools::WriteRegistryValue(const char *key, const char *value,
                                     KeyWOW64 view)
{
  kwsys_stl::string primary = key;
  kwsys_stl::string second;
  kwsys_stl::string valuename;

  size_t start = primary.find("\\");
  if (start == kwsys_stl::string::npos)
    {
    return false;
    }

  size_t valuenamepos = primary.find(";");
  if (valuenamepos != kwsys_stl::string::npos)
    {
    valuename = primary.substr(valuenamepos+1);
    }

  second = primary.substr(start+1, valuenamepos-start-1);
  primary = primary.substr(0, start);

  HKEY primaryKey = HKEY_CURRENT_USER;
  if (primary == "HKEY_CURRENT_USER")
    {
    primaryKey = HKEY_CURRENT_USER;
    }
  if (primary == "HKEY_CURRENT_CONFIG")
    {
    primaryKey = HKEY_CURRENT_CONFIG;
    }
  if (primary == "HKEY_CLASSES_ROOT")
    {
    primaryKey = HKEY_CLASSES_ROOT;
    }
  if (primary == "HKEY_LOCAL_MACHINE")
    {
    primaryKey = HKEY_LOCAL_MACHINE;
    }
  if (primary == "HKEY_USERS")
    {
    primaryKey = HKEY_USERS;
    }

  HKEY hKey;
  DWORD dwDummy;
  char lpClass[] = "";
  if(RegCreateKeyEx(primaryKey,
                    second.c_str(),
                    0,
                    lpClass,
                    REG_OPTION_NON_VOLATILE,
                    SystemToolsMakeRegistryMode(KEY_WRITE, view),
                    NULL,
                    &hKey,
                    &dwDummy) != ERROR_SUCCESS)
    {
    return false;
    }

  if(RegSetValueEx(hKey,
                   (LPTSTR)valuename.c_str(),
                   0,
                   REG_SZ,
                   (CONST BYTE *)value,
                   (DWORD)(strlen(value) + 1)) == ERROR_SUCCESS)
    {
    return true;
    }
  return false;
}
#else
bool SystemTools::WriteRegistryValue(const char *, const char *, KeyWOW64)
{
  return false;
}
#endif

// Delete a registry value.
// Example :
//      HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\2.1\InstallPath
//      =>  will delete the data of the "default" value of the key
//      HKEY_LOCAL_MACHINE\SOFTWARE\Scriptics\Tcl\8.4;Root
//      =>  will delete  the data of the "Root" value of the key

#if defined(_WIN32) && !defined(__CYGWIN__)
bool SystemTools::DeleteRegistryValue(const char *key, KeyWOW64 view)
{
  kwsys_stl::string primary = key;
  kwsys_stl::string second;
  kwsys_stl::string valuename;

  size_t start = primary.find("\\");
  if (start == kwsys_stl::string::npos)
    {
    return false;
    }

  size_t valuenamepos = primary.find(";");
  if (valuenamepos != kwsys_stl::string::npos)
    {
    valuename = primary.substr(valuenamepos+1);
    }

  second = primary.substr(start+1, valuenamepos-start-1);
  primary = primary.substr(0, start);

  HKEY primaryKey = HKEY_CURRENT_USER;
  if (primary == "HKEY_CURRENT_USER")
    {
    primaryKey = HKEY_CURRENT_USER;
    }
  if (primary == "HKEY_CURRENT_CONFIG")
    {
    primaryKey = HKEY_CURRENT_CONFIG;
    }
  if (primary == "HKEY_CLASSES_ROOT")
    {
    primaryKey = HKEY_CLASSES_ROOT;
    }
  if (primary == "HKEY_LOCAL_MACHINE")
    {
    primaryKey = HKEY_LOCAL_MACHINE;
    }
  if (primary == "HKEY_USERS")
    {
    primaryKey = HKEY_USERS;
    }

  HKEY hKey;
  if(RegOpenKeyEx(primaryKey,
                  second.c_str(),
                  0,
                  SystemToolsMakeRegistryMode(KEY_WRITE, view),
                  &hKey) != ERROR_SUCCESS)
    {
    return false;
    }
  else
    {
    if(RegDeleteValue(hKey,
                      (LPTSTR)valuename.c_str()) == ERROR_SUCCESS)
      {
      RegCloseKey(hKey);
      return true;
      }
    }
  return false;
}
#else
bool SystemTools::DeleteRegistryValue(const char *, KeyWOW64)
{
  return false;
}
#endif

bool SystemTools::SameFile(const char* file1, const char* file2)
{
#ifdef _WIN32
  HANDLE hFile1, hFile2;

  hFile1 = CreateFile( file1,
                      GENERIC_READ,
                      FILE_SHARE_READ ,
                      NULL,
                      OPEN_EXISTING,
                      FILE_FLAG_BACKUP_SEMANTICS,
                      NULL
    );
  hFile2 = CreateFile( file2,
                      GENERIC_READ,
                      FILE_SHARE_READ,
                      NULL,
                      OPEN_EXISTING,
                      FILE_FLAG_BACKUP_SEMANTICS,
                      NULL
    );
  if( hFile1 == INVALID_HANDLE_VALUE || hFile2 == INVALID_HANDLE_VALUE)
    {
    if(hFile1 != INVALID_HANDLE_VALUE)
      {
      CloseHandle(hFile1);
      }
    if(hFile2 != INVALID_HANDLE_VALUE)
      {
      CloseHandle(hFile2);
      }
    return false;
    }

   BY_HANDLE_FILE_INFORMATION fiBuf1;
   BY_HANDLE_FILE_INFORMATION fiBuf2;
   GetFileInformationByHandle( hFile1, &fiBuf1 );
   GetFileInformationByHandle( hFile2, &fiBuf2 );
   CloseHandle(hFile1);
   CloseHandle(hFile2);
   return (fiBuf1.dwVolumeSerialNumber == fiBuf2.dwVolumeSerialNumber &&
           fiBuf1.nFileIndexHigh == fiBuf2.nFileIndexHigh &&
           fiBuf1.nFileIndexLow == fiBuf2.nFileIndexLow);
#else
  struct stat fileStat1, fileStat2;
  if (stat(file1, &fileStat1) == 0 && stat(file2, &fileStat2) == 0)
    {
    // see if the files are the same file
    // check the device inode and size
    if(memcmp(&fileStat2.st_dev, &fileStat1.st_dev, sizeof(fileStat1.st_dev)) == 0 &&
       memcmp(&fileStat2.st_ino, &fileStat1.st_ino, sizeof(fileStat1.st_ino)) == 0 &&
       fileStat2.st_size == fileStat1.st_size
      )
      {
      return true;
      }
    }
  return false;
#endif
}

//----------------------------------------------------------------------------
#if defined(_WIN32) || defined(__CYGWIN__)
static bool WindowsFileExists(const char* filename)
{
  WIN32_FILE_ATTRIBUTE_DATA fd;
  return GetFileAttributesExA(filename, GetFileExInfoStandard, &fd) != 0;
}
#endif

//----------------------------------------------------------------------------
bool SystemTools::FileExists(const char* filename)
{
  if(!(filename && *filename))
    {
    return false;
    }
#if defined(__CYGWIN__)
  // Convert filename to native windows path if possible.
  char winpath[MAX_PATH];
  if(SystemTools::PathCygwinToWin32(filename, winpath))
    {
    return WindowsFileExists(winpath);
    }
  return access(filename, R_OK) == 0;
#elif defined(_WIN32)
  return WindowsFileExists(filename);
#else
  return access(filename, R_OK) == 0;
#endif
}

//----------------------------------------------------------------------------
bool SystemTools::FileExists(const char* filename, bool isFile)
{
  if(SystemTools::FileExists(filename))
    {
    // If isFile is set return not FileIsDirectory,
    // so this will only be true if it is a file
    return !isFile || !SystemTools::FileIsDirectory(filename);
    }
  return false;
}

//----------------------------------------------------------------------------
#ifdef __CYGWIN__
bool SystemTools::PathCygwinToWin32(const char *path, char *win32_path)
{
  SystemToolsTranslationMap::iterator i =
    SystemTools::Cyg2Win32Map->find(path);

  if (i != SystemTools::Cyg2Win32Map->end())
    {
    strncpy(win32_path, i->second.c_str(), MAX_PATH);
    }
  else
    {
    cygwin_conv_to_win32_path(path, win32_path);
    SystemToolsTranslationMap::value_type entry(path, win32_path);
    SystemTools::Cyg2Win32Map->insert(entry);
    }
  return win32_path[0] != 0;
}
#endif

bool SystemTools::Touch(const char* filename, bool create)
{
  if(create && !SystemTools::FileExists(filename))
    {
    FILE* file = fopen(filename, "a+b");
    if(file)
      {
      fclose(file);
      return true;
      }
    return false;
    }
#ifdef _MSC_VER
#define utime _utime
#define utimbuf _utimbuf
#endif
  struct stat fromStat;
  if(stat(filename, &fromStat) < 0)
    {
    return false;
    }
  struct utimbuf buf;
  buf.actime = fromStat.st_atime;
  buf.modtime = static_cast<time_t>(SystemTools::GetTime());
  if(utime(filename, &buf) < 0)
    {
    return false;
    }
  return true;
}

bool SystemTools::FileTimeCompare(const char* f1, const char* f2,
                                  int* result)
{
  // Default to same time.
  *result = 0;
#if !defined(_WIN32) || defined(__CYGWIN__)
  // POSIX version.  Use stat function to get file modification time.
  struct stat s1;
  if(stat(f1, &s1) != 0)
    {
    return false;
    }
  struct stat s2;
  if(stat(f2, &s2) != 0)
    {
    return false;
    }
# if KWSYS_STAT_HAS_ST_MTIM
  // Compare using nanosecond resolution.
  if(s1.st_mtim.tv_sec < s2.st_mtim.tv_sec)
    {
    *result = -1;
    }
  else if(s1.st_mtim.tv_sec > s2.st_mtim.tv_sec)
    {
    *result = 1;
    }
  else if(s1.st_mtim.tv_nsec < s2.st_mtim.tv_nsec)
    {
    *result = -1;
    }
  else if(s1.st_mtim.tv_nsec > s2.st_mtim.tv_nsec)
    {
    *result = 1;
    }
# else
  // Compare using 1 second resolution.
  if(s1.st_mtime < s2.st_mtime)
    {
    *result = -1;
    }
  else if(s1.st_mtime > s2.st_mtime)
    {
    *result = 1;
    }
# endif
#else
  // Windows version.  Get the modification time from extended file attributes.
  WIN32_FILE_ATTRIBUTE_DATA f1d;
  WIN32_FILE_ATTRIBUTE_DATA f2d;
  if(!GetFileAttributesEx(f1, GetFileExInfoStandard, &f1d))
    {
    return false;
    }
  if(!GetFileAttributesEx(f2, GetFileExInfoStandard, &f2d))
    {
    return false;
    }

  // Compare the file times using resolution provided by system call.
  *result = (int)CompareFileTime(&f1d.ftLastWriteTime, &f2d.ftLastWriteTime);
#endif
  return true;
}


// Return a capitalized string (i.e the first letter is uppercased, all other
// are lowercased)
kwsys_stl::string SystemTools::Capitalized(const kwsys_stl::string& s)
{
  kwsys_stl::string n;
  if(s.size() == 0)
    {
    return n;
    }
  n.resize(s.size());
  n[0] = static_cast<kwsys_stl::string::value_type>(toupper(s[0]));
  for (size_t i = 1; i < s.size(); i++)
    {
    n[i] = static_cast<kwsys_stl::string::value_type>(tolower(s[i]));
    }
  return n;
}

// Return capitalized words
kwsys_stl::string SystemTools::CapitalizedWords(const kwsys_stl::string& s)
{
  kwsys_stl::string n(s);
  for (size_t i = 0; i < s.size(); i++)
    {
#if defined(_MSC_VER) && defined (_MT) && defined (_DEBUG)
    // MS has an assert that will fail if s[i] < 0; setting
    // LC_CTYPE using setlocale() does *not* help. Painful.
    if ((int)s[i] >= 0 && isalpha(s[i]) &&
        (i == 0 || ((int)s[i - 1] >= 0 && isspace(s[i - 1]))))
#else
    if (isalpha(s[i]) && (i == 0 || isspace(s[i - 1])))
#endif
      {
      n[i] = static_cast<kwsys_stl::string::value_type>(toupper(s[i]));
      }
    }
  return n;
}

// Return uncapitalized words
kwsys_stl::string SystemTools::UnCapitalizedWords(const kwsys_stl::string& s)
{
  kwsys_stl::string n(s);
  for (size_t i = 0; i < s.size(); i++)
    {
#if defined(_MSC_VER) && defined (_MT) && defined (_DEBUG)
    // MS has an assert that will fail if s[i] < 0; setting
    // LC_CTYPE using setlocale() does *not* help. Painful.
    if ((int)s[i] >= 0 && isalpha(s[i]) &&
        (i == 0 || ((int)s[i - 1] >= 0 && isspace(s[i - 1]))))
#else
    if (isalpha(s[i]) && (i == 0 || isspace(s[i - 1])))
#endif
      {
      n[i] = static_cast<kwsys_stl::string::value_type>(tolower(s[i]));
      }
    }
  return n;
}

// only works for words with at least two letters
kwsys_stl::string SystemTools::AddSpaceBetweenCapitalizedWords(
  const kwsys_stl::string& s)
{
  kwsys_stl::string n;
  if (s.size())
    {
    n.reserve(s.size());
    n += s[0];
    for (size_t i = 1; i < s.size(); i++)
      {
      if (isupper(s[i]) && !isspace(s[i - 1]) && !isupper(s[i - 1]))
        {
        n += ' ';
        }
      n += s[i];
      }
    }
  return n;
}

char* SystemTools::AppendStrings(const char* str1, const char* str2)
{
  if (!str1)
    {
    return SystemTools::DuplicateString(str2);
    }
  if (!str2)
    {
    return SystemTools::DuplicateString(str1);
    }
  size_t len1 = strlen(str1);
  char *newstr = new char[len1 + strlen(str2) + 1];
  if (!newstr)
    {
    return 0;
    }
  strcpy(newstr, str1);
  strcat(newstr + len1, str2);
  return newstr;
}

char* SystemTools::AppendStrings(
  const char* str1, const char* str2, const char* str3)
{
  if (!str1)
    {
    return SystemTools::AppendStrings(str2, str3);
    }
  if (!str2)
    {
    return SystemTools::AppendStrings(str1, str3);
    }
  if (!str3)
    {
    return SystemTools::AppendStrings(str1, str2);
    }

  size_t len1 = strlen(str1), len2 = strlen(str2);
  char *newstr = new char[len1 + len2 + strlen(str3) + 1];
  if (!newstr)
    {
    return 0;
    }
  strcpy(newstr, str1);
  strcat(newstr + len1, str2);
  strcat(newstr + len1 + len2, str3);
  return newstr;
}

// Return a lower case string
kwsys_stl::string SystemTools::LowerCase(const kwsys_stl::string& s)
{
  kwsys_stl::string n;
  n.resize(s.size());
  for (size_t i = 0; i < s.size(); i++)
    {
    n[i] = static_cast<kwsys_stl::string::value_type>(tolower(s[i]));
    }
  return n;
}

// Return a lower case string
kwsys_stl::string SystemTools::UpperCase(const kwsys_stl::string& s)
{
  kwsys_stl::string n;
  n.resize(s.size());
  for (size_t i = 0; i < s.size(); i++)
    {
    n[i] = static_cast<kwsys_stl::string::value_type>(toupper(s[i]));
    }
  return n;
}

// Count char in string
size_t SystemTools::CountChar(const char* str, char c)
{
  size_t count = 0;

  if (str)
    {
    while (*str)
      {
      if (*str == c)
        {
        ++count;
        }
      ++str;
      }
    }
  return count;
}

// Remove chars in string
char* SystemTools::RemoveChars(const char* str, const char *toremove)
{
  if (!str)
    {
    return NULL;
    }
  char *clean_str = new char [strlen(str) + 1];
  char *ptr = clean_str;
  while (*str)
    {
    const char *str2 = toremove;
    while (*str2 && *str != *str2)
      {
      ++str2;
      }
    if (!*str2)
      {
      *ptr++ = *str;
      }
    ++str;
    }
  *ptr = '\0';
  return clean_str;
}

// Remove chars in string
char* SystemTools::RemoveCharsButUpperHex(const char* str)
{
  if (!str)
    {
    return 0;
    }
  char *clean_str = new char [strlen(str) + 1];
  char *ptr = clean_str;
  while (*str)
    {
    if ((*str >= '0' && *str <= '9') || (*str >= 'A' && *str <= 'F'))
      {
      *ptr++ = *str;
      }
    ++str;
    }
  *ptr = '\0';
  return clean_str;
}

// Replace chars in string
char* SystemTools::ReplaceChars(char* str, const char *toreplace, char replacement)
{
  if (str)
    {
    char *ptr = str;
    while (*ptr)
      {
      const char *ptr2 = toreplace;
      while (*ptr2)
        {
        if (*ptr == *ptr2)
          {
          *ptr = replacement;
          }
        ++ptr2;
        }
      ++ptr;
      }
    }
  return str;
}

// Returns if string starts with another string
bool SystemTools::StringStartsWith(const char* str1, const char* str2)
{
  if (!str1 || !str2)
    {
    return false;
    }
  size_t len1 = strlen(str1), len2 = strlen(str2);
  return len1 >= len2 && !strncmp(str1, str2, len2) ? true : false;
}

// Returns if string ends with another string
bool SystemTools::StringEndsWith(const char* str1, const char* str2)
{
  if (!str1 || !str2)
    {
    return false;
    }
  size_t len1 = strlen(str1), len2 = strlen(str2);
  return len1 >= len2 &&  !strncmp(str1 + (len1 - len2), str2, len2) ? true : false;
}

// Returns a pointer to the last occurence of str2 in str1
const char* SystemTools::FindLastString(const char* str1, const char* str2)
{
  if (!str1 || !str2)
    {
    return NULL;
    }

  size_t len1 = strlen(str1), len2 = strlen(str2);
  if (len1 >= len2)
    {
    const char *ptr = str1 + len1 - len2;
    do
      {
      if (!strncmp(ptr, str2, len2))
        {
        return ptr;
        }
      } while (ptr-- != str1);
    }

  return NULL;
}

// Duplicate string
char* SystemTools::DuplicateString(const char* str)
{
  if (str)
    {
    char *newstr = new char [strlen(str) + 1];
    return strcpy(newstr, str);
    }
  return NULL;
}

// Return a cropped string
kwsys_stl::string SystemTools::CropString(const kwsys_stl::string& s,
                                          size_t max_len)
{
  if (!s.size() || max_len == 0 || max_len >= s.size())
    {
    return s;
    }

  kwsys_stl::string n;
  n.reserve(max_len);

  size_t middle = max_len / 2;

  n += s.substr(0, middle);
  n += s.substr(s.size() - (max_len - middle), kwsys_stl::string::npos);

  if (max_len > 2)
    {
    n[middle] = '.';
    if (max_len > 3)
      {
      n[middle - 1] = '.';
      if (max_len > 4)
        {
        n[middle + 1] = '.';
        }
      }
    }

  return n;
}

//----------------------------------------------------------------------------
kwsys_stl::vector<kwsys::String> SystemTools::SplitString(const char* p, char sep, bool isPath)
{
  kwsys_stl::string path = p;
  kwsys_stl::vector<kwsys::String> paths;
  if(path.empty())
    {
    return paths;
    }
  if(isPath && path[0] == '/')
    {
    path.erase(path.begin());
    paths.push_back("/");
    }
  kwsys_stl::string::size_type pos1 = 0;
  kwsys_stl::string::size_type pos2 = path.find(sep, pos1+1);
  while(pos2 != kwsys_stl::string::npos)
    {
    paths.push_back(path.substr(pos1, pos2-pos1));
    pos1 = pos2+1;
    pos2 = path.find(sep, pos1+1);
    }
  paths.push_back(path.substr(pos1, pos2-pos1));

  return paths;
}

//----------------------------------------------------------------------------
int SystemTools::EstimateFormatLength(const char *format, va_list ap)
{
  if (!format)
    {
    return 0;
    }

  // Quick-hack attempt at estimating the length of the string.
  // Should never under-estimate.

  // Start with the length of the format string itself.

  size_t length = strlen(format);

  // Increase the length for every argument in the format.

  const char* cur = format;
  while(*cur)
    {
    if(*cur++ == '%')
      {
      // Skip "%%" since it doesn't correspond to a va_arg.
      if(*cur != '%')
        {
        while(!int(isalpha(*cur)))
          {
          ++cur;
          }
        switch (*cur)
          {
          case 's':
          {
          // Check the length of the string.
          char* s = va_arg(ap, char*);
          if(s)
            {
            length += strlen(s);
            }
          } break;
          case 'e':
          case 'f':
          case 'g':
          {
          // Assume the argument contributes no more than 64 characters.
          length += 64;

          // Eat the argument.
          static_cast<void>(va_arg(ap, double));
          } break;
          default:
          {
          // Assume the argument contributes no more than 64 characters.
          length += 64;

          // Eat the argument.
          static_cast<void>(va_arg(ap, int));
          } break;
          }
        }

      // Move past the characters just tested.
      ++cur;
      }
    }

  return static_cast<int>(length);
}

kwsys_stl::string SystemTools::EscapeChars(
  const char *str,
  const char *chars_to_escape,
  char escape_char)
{
  kwsys_stl::string n;
  if (str)
    {
    if (!chars_to_escape || !*chars_to_escape)
      {
      n.append(str);
      }
    else
      {
      n.reserve(strlen(str));
      while (*str)
        {
        const char *ptr = chars_to_escape;
        while (*ptr)
          {
          if (*str == *ptr)
            {
            n += escape_char;
            break;
            }
          ++ptr;
          }
        n += *str;
        ++str;
        }
      }
    }
  return n;
}

#ifdef __VMS
static void ConvertVMSToUnix(kwsys_stl::string& path)
{
  kwsys_stl::string::size_type rootEnd = path.find(":[");
  kwsys_stl::string::size_type pathEnd = path.find("]");
  if(rootEnd != path.npos)
    {
    kwsys_stl::string root = path.substr(0, rootEnd);
    kwsys_stl::string pathPart = path.substr(rootEnd+2, pathEnd - rootEnd-2);
    const char* pathCString = pathPart.c_str();
    const char* pos0 = pathCString;
    for (kwsys_stl::string::size_type pos = 0; *pos0; ++ pos )
      {
      if ( *pos0 == '.' )
        {
        pathPart[pos] = '/';
        }
      pos0 ++;
      }
    path = "/"+ root + "/" + pathPart;
    }
}
#endif

// convert windows slashes to unix slashes
void SystemTools::ConvertToUnixSlashes(kwsys_stl::string& path)
{
  const char* pathCString = path.c_str();
  bool hasDoubleSlash = false;
#ifdef __VMS
  ConvertVMSToUnix(path);
#else
  const char* pos0 = pathCString;
  const char* pos1 = pathCString+1;
  for (kwsys_stl::string::size_type pos = 0; *pos0; ++ pos )
    {
    // make sure we don't convert an escaped space to a unix slash
    if ( *pos0 == '\\' && *pos1 != ' ' )
      {
      path[pos] = '/';
      }

    // Also, reuse the loop to check for slash followed by another slash
    if (*pos1 == '/' && *(pos1+1) == '/' && !hasDoubleSlash)
      {
#ifdef _WIN32
      // However, on windows if the first characters are both slashes,
      // then keep them that way, so that network paths can be handled.
      if ( pos > 0)
        {
        hasDoubleSlash = true;
        }
#else
      hasDoubleSlash = true;
#endif
      }

    pos0 ++;
    pos1 ++;
    }

  if ( hasDoubleSlash )
    {
    SystemTools::ReplaceString(path, "//", "/");
    }
#endif
  // remove any trailing slash
  if(!path.empty())
    {
    // if there is a tilda ~ then replace it with HOME
    pathCString = path.c_str();
    if(pathCString[0] == '~' && (pathCString[1] == '/' || pathCString[1] == '\0'))
      {
      const char* homeEnv = SystemTools::GetEnv("HOME");
      if (homeEnv)
        {
        path.replace(0,1,homeEnv);
        }
      }
#ifdef HAVE_GETPWNAM
    else if(pathCString[0] == '~')
      {
      kwsys_stl::string::size_type idx = path.find_first_of("/\0");
      kwsys_stl::string user = path.substr(1, idx-1);
      passwd* pw = getpwnam(user.c_str());
      if(pw)
        {
        path.replace(0, idx, pw->pw_dir);
        }
      }
#endif
    // remove trailing slash if the path is more than
    // a single /
    pathCString = path.c_str();
    if(path.size() > 1 && *(pathCString+(path.size()-1)) == '/')
      {
      // if it is c:/ then do not remove the trailing slash
      if(!((path.size() == 3 && pathCString[1] == ':')))
        {
        path = path.substr(0, path.size()-1);
        }
      }
    }
}

// change // to /, and escape any spaces in the path
kwsys_stl::string SystemTools::ConvertToUnixOutputPath(const char* path)
{
  kwsys_stl::string ret = path;

  // remove // except at the beginning might be a cygwin drive
  kwsys_stl::string::size_type pos=1;
  while((pos = ret.find("//", pos)) != kwsys_stl::string::npos)
    {
    ret.erase(pos, 1);
    }
  // escape spaces and () in the path
  if(ret.find_first_of(" ") != kwsys_stl::string::npos)
    {
    kwsys_stl::string result = "";
    char lastch = 1;
    for(const char* ch = ret.c_str(); *ch != '\0'; ++ch)
      {
        // if it is already escaped then don't try to escape it again
      if((*ch == ' ') && lastch != '\\')
        {
        result += '\\';
        }
      result += *ch;
      lastch = *ch;
      }
    ret = result;
    }
  return ret;
}

kwsys_stl::string SystemTools::ConvertToOutputPath(const char* path)
{
#if defined(_WIN32) && !defined(__CYGWIN__)
  return SystemTools::ConvertToWindowsOutputPath(path);
#else
  return SystemTools::ConvertToUnixOutputPath(path);
#endif
}

// remove double slashes not at the start
kwsys_stl::string SystemTools::ConvertToWindowsOutputPath(const char* path)
{
  kwsys_stl::string ret;
  // make it big enough for all of path and double quotes
  ret.reserve(strlen(path)+3);
  // put path into the string
  ret.assign(path);
  ret = path;
  kwsys_stl::string::size_type pos = 0;
  // first convert all of the slashes
  while((pos = ret.find('/', pos)) != kwsys_stl::string::npos)
    {
    ret[pos] = '\\';
    pos++;
    }
  // check for really small paths
  if(ret.size() < 2)
    {
    return ret;
    }
  // now clean up a bit and remove double slashes
  // Only if it is not the first position in the path which is a network
  // path on windows
  pos = 1; // start at position 1
  if(ret[0] == '\"')
    {
    pos = 2;  // if the string is already quoted then start at 2
    if(ret.size() < 3)
      {
      return ret;
      }
    }
  while((pos = ret.find("\\\\", pos)) != kwsys_stl::string::npos)
    {
    ret.erase(pos, 1);
    }
  // now double quote the path if it has spaces in it
  // and is not already double quoted
  if(ret.find(' ') != kwsys_stl::string::npos
     && ret[0] != '\"')
    {
    ret.insert(static_cast<kwsys_stl::string::size_type>(0),
               static_cast<kwsys_stl::string::size_type>(1), '\"');
    ret.append(1, '\"');
    }
  return ret;
}

bool SystemTools::CopyFileIfDifferent(const char* source,
                                      const char* destination)
{
  // special check for a destination that is a directory
  // FilesDiffer does not handle file to directory compare
  if(SystemTools::FileIsDirectory(destination))
    {
    kwsys_stl::string new_destination = destination;
    SystemTools::ConvertToUnixSlashes(new_destination);
    new_destination += '/';
    kwsys_stl::string source_name = source;
    new_destination += SystemTools::GetFilenameName(source_name);
    if(SystemTools::FilesDiffer(source, new_destination.c_str()))
      {
      return SystemTools::CopyFileAlways(source, destination);
      }
    else
      {
      // the files are the same so the copy is done return
      // true
      return true;
      }
    }
  // source and destination are files so do a copy if they
  // are different
  if(SystemTools::FilesDiffer(source, destination))
    {
    return SystemTools::CopyFileAlways(source, destination);
    }
  // at this point the files must be the same so return true
  return true;
}

#define KWSYS_ST_BUFFER 4096

bool SystemTools::FilesDiffer(const char* source,
                              const char* destination)
{
  struct stat statSource;
  if (stat(source, &statSource) != 0)
    {
    return true;
    }

  struct stat statDestination;
  if (stat(destination, &statDestination) != 0)
    {
    return true;
    }

  if(statSource.st_size != statDestination.st_size)
    {
    return true;
    }

  if(statSource.st_size == 0)
    {
    return false;
    }

#if defined(_WIN32) || defined(__CYGWIN__)
  kwsys_ios::ifstream finSource(source, (kwsys_ios::ios::binary |
                                         kwsys_ios::ios::in));
  kwsys_ios::ifstream finDestination(destination, (kwsys_ios::ios::binary |
                                                   kwsys_ios::ios::in));
#else
  kwsys_ios::ifstream finSource(source);
  kwsys_ios::ifstream finDestination(destination);
#endif
  if(!finSource || !finDestination)
    {
    return true;
    }

  // Compare the files a block at a time.
  char source_buf[KWSYS_ST_BUFFER];
  char dest_buf[KWSYS_ST_BUFFER];
  off_t nleft = statSource.st_size;
  while(nleft > 0)
    {
    // Read a block from each file.
    kwsys_ios::streamsize nnext = (nleft > KWSYS_ST_BUFFER)? KWSYS_ST_BUFFER : static_cast<kwsys_ios::streamsize>(nleft);
    finSource.read(source_buf, nnext);
    finDestination.read(dest_buf, nnext);

    // If either failed to read assume they are different.
    if(static_cast<kwsys_ios::streamsize>(finSource.gcount()) != nnext ||
       static_cast<kwsys_ios::streamsize>(finDestination.gcount()) != nnext)
      {
      return true;
      }

    // If this block differs the file differs.
    if(memcmp(static_cast<const void*>(source_buf),
              static_cast<const void*>(dest_buf),
              static_cast<size_t>(nnext)) != 0)
      {
      return true;
      }

    // Update the byte count remaining.
    nleft -= nnext;
    }

  // No differences found.
  return false;
}


//----------------------------------------------------------------------------
/**
 * Copy a file named by "source" to the file named by "destination".
 */
bool SystemTools::CopyFileAlways(const char* source, const char* destination)
{
  // If files are the same do not copy
  if ( SystemTools::SameFile(source, destination) )
    {
    return true;
    }
  mode_t perm = 0;
  bool perms = SystemTools::GetPermissions(source, perm);

  const int bufferSize = 4096;
  char buffer[bufferSize];

  // If destination is a directory, try to create a file with the same
  // name as the source in that directory.

  kwsys_stl::string new_destination;
  if(SystemTools::FileExists(destination) &&
     SystemTools::FileIsDirectory(destination))
    {
    new_destination = destination;
    SystemTools::ConvertToUnixSlashes(new_destination);
    new_destination += '/';
    kwsys_stl::string source_name = source;
    new_destination += SystemTools::GetFilenameName(source_name);
    destination = new_destination.c_str();
    }

  // Create destination directory

  kwsys_stl::string destination_dir = destination;
  destination_dir = SystemTools::GetFilenamePath(destination_dir);
  SystemTools::MakeDirectory(destination_dir.c_str());

  // Open files

#if defined(_WIN32) || defined(__CYGWIN__)
  kwsys_ios::ifstream fin(source,
                    kwsys_ios::ios::binary | kwsys_ios::ios::in);
#else
  kwsys_ios::ifstream fin(source);
#endif
  if(!fin)
    {
    return false;
    }

  // try and remove the destination file so that read only destination files
  // can be written to.
  // If the remove fails continue so that files in read only directories
  // that do not allow file removal can be modified.
  SystemTools::RemoveFile(destination);

#if defined(_WIN32) || defined(__CYGWIN__)
  kwsys_ios::ofstream fout(destination,
                     kwsys_ios::ios::binary | kwsys_ios::ios::out | kwsys_ios::ios::trunc);
#else
  kwsys_ios::ofstream fout(destination,
                     kwsys_ios::ios::out | kwsys_ios::ios::trunc);
#endif
  if(!fout)
    {
    return false;
    }

  // This copy loop is very sensitive on certain platforms with
  // slightly broken stream libraries (like HPUX).  Normally, it is
  // incorrect to not check the error condition on the fin.read()
  // before using the data, but the fin.gcount() will be zero if an
  // error occurred.  Therefore, the loop should be safe everywhere.
  while(fin)
    {
    fin.read(buffer, bufferSize);
    if(fin.gcount())
      {
      fout.write(buffer, fin.gcount());
      }
    }

  // Make sure the operating system has finished writing the file
  // before closing it.  This will ensure the file is finished before
  // the check below.
  fout.flush();

  fin.close();
  fout.close();

  if(!fout)
    {
    return false;
    }
  if ( perms )
    {
    if ( !SystemTools::SetPermissions(destination, perm) )
      {
      return false;
      }
    }
  return true;
}

//----------------------------------------------------------------------------
bool SystemTools::CopyAFile(const char* source, const char* destination,
                            bool always)
{
  if(always)
    {
    return SystemTools::CopyFileAlways(source, destination);
    }
  else
    {
    return SystemTools::CopyFileIfDifferent(source, destination);
    }
}

/**
 * Copy a directory content from "source" directory to the directory named by
 * "destination".
 */
bool SystemTools::CopyADirectory(const char* source, const char* destination,
                                 bool always)
{
  Directory dir;
  dir.Load(source);
  size_t fileNum;
  if ( !SystemTools::MakeDirectory(destination) )
    {
    return false;
    }
  for (fileNum = 0; fileNum <  dir.GetNumberOfFiles(); ++fileNum)
    {
    if (strcmp(dir.GetFile(static_cast<unsigned long>(fileNum)),".") &&
        strcmp(dir.GetFile(static_cast<unsigned long>(fileNum)),".."))
      {
      kwsys_stl::string fullPath = source;
      fullPath += "/";
      fullPath += dir.GetFile(static_cast<unsigned long>(fileNum));
      if(SystemTools::FileIsDirectory(fullPath.c_str()))
        {
        kwsys_stl::string fullDestPath = destination;
        fullDestPath += "/";
        fullDestPath += dir.GetFile(static_cast<unsigned long>(fileNum));
        if (!SystemTools::CopyADirectory(fullPath.c_str(),
                                         fullDestPath.c_str(),
                                         always))
          {
          return false;
          }
        }
      else
        {
        if(!SystemTools::CopyAFile(fullPath.c_str(), destination, always))
          {
          return false;
          }
        }
      }
    }

  return true;
}


// return size of file; also returns zero if no file exists
unsigned long SystemTools::FileLength(const char* filename)
{
  struct stat fs;
  if (stat(filename, &fs) != 0)
    {
      return 0;
    }
  else
    {
      return static_cast<unsigned long>(fs.st_size);
    }
}

int SystemTools::Strucmp(const char *s1, const char *s2)
{
  // lifted from Graphvis http://www.graphviz.org
  while ((*s1 != '\0')
         && (tolower(*s1) == tolower(*s2)))
    {
      s1++;
      s2++;
    }

  return tolower(*s1) - tolower(*s2);
}

// return file's modified time
long int SystemTools::ModifiedTime(const char* filename)
{
  struct stat fs;
  if (stat(filename, &fs) != 0)
    {
    return 0;
    }
  else
    {
    return static_cast<long int>(fs.st_mtime);
    }
}

// return file's creation time
long int SystemTools::CreationTime(const char* filename)
{
  struct stat fs;
  if (stat(filename, &fs) != 0)
    {
    return 0;
    }
  else
    {
    return fs.st_ctime >= 0 ? static_cast<long int>(fs.st_ctime) : 0;
    }
}

bool SystemTools::ConvertDateMacroString(const char *str, time_t *tmt)
{
  if (!str || !tmt || strlen(str) > 11)
    {
    return false;
    }

  struct tm tmt2;

  // __DATE__
  // The compilation date of the current source file. The date is a string
  // literal of the form Mmm dd yyyy. The month name Mmm is the same as for
  // dates generated by the library function asctime declared in TIME.H.

  // index:   012345678901
  // format:  Mmm dd yyyy
  // example: Dec 19 2003

  static char month_names[] = "JanFebMarAprMayJunJulAugSepOctNovDec";

  char buffer[12];
  strcpy(buffer, str);

  buffer[3] = 0;
  char *ptr = strstr(month_names, buffer);
  if (!ptr)
    {
    return false;
    }

  int month = static_cast<int>((ptr - month_names) / 3);
  int day = atoi(buffer + 4);
  int year = atoi(buffer + 7);

  tmt2.tm_isdst = -1;
  tmt2.tm_hour  = 0;
  tmt2.tm_min   = 0;
  tmt2.tm_sec   = 0;
  tmt2.tm_wday  = 0;
  tmt2.tm_yday  = 0;
  tmt2.tm_mday  = day;
  tmt2.tm_mon   = month;
  tmt2.tm_year  = year - 1900;

  *tmt = mktime(&tmt2);
  return true;
}

bool SystemTools::ConvertTimeStampMacroString(const char *str, time_t *tmt)
{
  if (!str || !tmt || strlen(str) > 26)
    {
    return false;
    }

  struct tm tmt2;

  // __TIMESTAMP__
  // The date and time of the last modification of the current source file,
  // expressed as a string literal in the form Ddd Mmm Date hh:mm:ss yyyy,
  /// where Ddd is the abbreviated day of the week and Date is an integer
  // from 1 to 31.

  // index:   0123456789
  //                    0123456789
  //                              0123456789
  // format:  Ddd Mmm Date hh:mm:ss yyyy
  // example: Fri Dec 19 14:34:58 2003

  static char month_names[] = "JanFebMarAprMayJunJulAugSepOctNovDec";

  char buffer[27];
  strcpy(buffer, str);

  buffer[7] = 0;
  char *ptr = strstr(month_names, buffer + 4);
  if (!ptr)
    {
    return false;
    }

  int month = static_cast<int>((ptr - month_names) / 3);
  int day = atoi(buffer + 8);
  int hour = atoi(buffer + 11);
  int min = atoi(buffer + 14);
  int sec = atoi(buffer + 17);
  int year = atoi(buffer + 20);

  tmt2.tm_isdst = -1;
  tmt2.tm_hour  = hour;
  tmt2.tm_min   = min;
  tmt2.tm_sec   = sec;
  tmt2.tm_wday  = 0;
  tmt2.tm_yday  = 0;
  tmt2.tm_mday  = day;
  tmt2.tm_mon   = month;
  tmt2.tm_year  = year - 1900;

  *tmt = mktime(&tmt2);
  return true;
}

kwsys_stl::string SystemTools::GetLastSystemError()
{
  int e = errno;
  return strerror(e);
}

bool SystemTools::RemoveFile(const char* source)
{
#ifdef _WIN32
  mode_t mode;
  if ( !SystemTools::GetPermissions(source, mode) )
    {
    return false;
    }
  /* Win32 unlink is stupid --- it fails if the file is read-only  */
  SystemTools::SetPermissions(source, S_IWRITE);
#endif
  bool res = unlink(source) != 0 ? false : true;
#ifdef _WIN32
  if ( !res )
    {
    SystemTools::SetPermissions(source, mode);
    }
#endif
  return res;
}

bool SystemTools::RemoveADirectory(const char* source)
{
  // Add write permission to the directory so we can modify its
  // content to remove files and directories from it.
  mode_t mode;
  if(SystemTools::GetPermissions(source, mode))
    {
#if defined(_WIN32) && !defined(__CYGWIN__)
    mode |= S_IWRITE;
#else
    mode |= S_IWUSR;
#endif
    SystemTools::SetPermissions(source, mode);
    }

  Directory dir;
  dir.Load(source);
  size_t fileNum;
  for (fileNum = 0; fileNum <  dir.GetNumberOfFiles(); ++fileNum)
    {
    if (strcmp(dir.GetFile(static_cast<unsigned long>(fileNum)),".") &&
        strcmp(dir.GetFile(static_cast<unsigned long>(fileNum)),".."))
      {
      kwsys_stl::string fullPath = source;
      fullPath += "/";
      fullPath += dir.GetFile(static_cast<unsigned long>(fileNum));
      if(SystemTools::FileIsDirectory(fullPath.c_str()) &&
        !SystemTools::FileIsSymlink(fullPath.c_str()))
        {
        if (!SystemTools::RemoveADirectory(fullPath.c_str()))
          {
          return false;
          }
        }
      else
        {
        if(!SystemTools::RemoveFile(fullPath.c_str()))
          {
          return false;
          }
        }
      }
    }

  return (Rmdir(source) == 0);
}

/**
 */
size_t SystemTools::GetMaximumFilePathLength()
{
  return KWSYS_SYSTEMTOOLS_MAXPATH;
}

/**
 * Find the file the given name.  Searches the given path and then
 * the system search path.  Returns the full path to the file if it is
 * found.  Otherwise, the empty string is returned.
 */
kwsys_stl::string SystemTools
::FindName(const char* name,
           const kwsys_stl::vector<kwsys_stl::string>& userPaths,
           bool no_system_path)
{
  // Add the system search path to our path first
  kwsys_stl::vector<kwsys_stl::string> path;
  if (!no_system_path)
    {
    SystemTools::GetPath(path, "CMAKE_FILE_PATH");
    SystemTools::GetPath(path);
    }
  // now add the additional paths
  {
  for(kwsys_stl::vector<kwsys_stl::string>::const_iterator i = userPaths.begin();
        i != userPaths.end(); ++i)
    {
    path.push_back(*i);
    }
  }
  // Add a trailing slash to all paths to aid the search process.
  {
  for(kwsys_stl::vector<kwsys_stl::string>::iterator i = path.begin();
      i != path.end(); ++i)
    {
    kwsys_stl::string& p = *i;
    if(p.empty() || p[p.size()-1] != '/')
      {
      p += "/";
      }
    }
  }
  // now look for the file
  kwsys_stl::string tryPath;
  for(kwsys_stl::vector<kwsys_stl::string>::const_iterator p = path.begin();
      p != path.end(); ++p)
    {
    tryPath = *p;
    tryPath += name;
    if(SystemTools::FileExists(tryPath.c_str()))
      {
      return tryPath;
      }
    }
  // Couldn't find the file.
  return "";
}

/**
 * Find the file the given name.  Searches the given path and then
 * the system search path.  Returns the full path to the file if it is
 * found.  Otherwise, the empty string is returned.
 */
kwsys_stl::string SystemTools
::FindFile(const char* name,
           const kwsys_stl::vector<kwsys_stl::string>& userPaths,
           bool no_system_path)
{
  kwsys_stl::string tryPath = SystemTools::FindName(name, userPaths, no_system_path);
  if(tryPath != "" && !SystemTools::FileIsDirectory(tryPath.c_str()))
    {
    return SystemTools::CollapseFullPath(tryPath.c_str());
    }
  // Couldn't find the file.
  return "";
}

/**
 * Find the directory the given name.  Searches the given path and then
 * the system search path.  Returns the full path to the directory if it is
 * found.  Otherwise, the empty string is returned.
 */
kwsys_stl::string SystemTools
::FindDirectory(const char* name,
                const kwsys_stl::vector<kwsys_stl::string>& userPaths,
                bool no_system_path)
{
  kwsys_stl::string tryPath = SystemTools::FindName(name, userPaths, no_system_path);
  if(tryPath != "" && SystemTools::FileIsDirectory(tryPath.c_str()))
    {
    return SystemTools::CollapseFullPath(tryPath.c_str());
    }
  // Couldn't find the file.
  return "";
}

/**
 * Find the executable with the given name.  Searches the given path and then
 * the system search path.  Returns the full path to the executable if it is
 * found.  Otherwise, the empty string is returned.
 */
kwsys_stl::string SystemTools::FindProgram(
  const char* nameIn,
  const kwsys_stl::vector<kwsys_stl::string>& userPaths,
  bool no_system_path)
{
  if(!nameIn || !*nameIn)
    {
    return "";
    }
  kwsys_stl::string name = nameIn;
  kwsys_stl::vector<kwsys_stl::string> extensions;
#if defined (_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__)
  bool hasExtension = false;
  // check to see if the name already has a .xxx at
  // the end of it
  if(name.size() > 3 && name[name.size()-4] == '.')
    {
    hasExtension = true;
    }
  // on windows try .com then .exe
  if(!hasExtension)
    {
    extensions.push_back(".com");
    extensions.push_back(".exe");
    }
#endif
  kwsys_stl::string tryPath;

  // first try with extensions if the os supports them
  if(extensions.size())
    {
    for(kwsys_stl::vector<kwsys_stl::string>::iterator i =
          extensions.begin(); i != extensions.end(); ++i)
      {
      tryPath = name;
      tryPath += *i;
      if(SystemTools::FileExists(tryPath.c_str()) &&
         !SystemTools::FileIsDirectory(tryPath.c_str()))
        {
        return SystemTools::CollapseFullPath(tryPath.c_str());
        }
      }
    }
  // now try just the name
  tryPath = name;
  if(SystemTools::FileExists(tryPath.c_str()) &&
     !SystemTools::FileIsDirectory(tryPath.c_str()))
    {
    return SystemTools::CollapseFullPath(tryPath.c_str());
    }
  // now construct the path
  kwsys_stl::vector<kwsys_stl::string> path;
  // Add the system search path to our path.
  if (!no_system_path)
    {
    SystemTools::GetPath(path);
    }
  // now add the additional paths
  {
  for(kwsys_stl::vector<kwsys_stl::string>::const_iterator i =
        userPaths.begin();  i != userPaths.end(); ++i)
    {
    path.push_back(*i);
    }
  }
  // Add a trailing slash to all paths to aid the search process.
  {
  for(kwsys_stl::vector<kwsys_stl::string>::iterator i = path.begin();
      i != path.end(); ++i)
    {
    kwsys_stl::string& p = *i;
    if(p.empty() || p[p.size()-1] != '/')
      {
      p += "/";
      }
    }
  }
  // Try each path
  for(kwsys_stl::vector<kwsys_stl::string>::iterator p = path.begin();
      p != path.end(); ++p)
    {
#ifdef _WIN32
    // Remove double quotes from the path on windows
    SystemTools::ReplaceString(*p, "\"", "");
#endif
    // first try with extensions
    if(extensions.size())
      {
      for(kwsys_stl::vector<kwsys_stl::string>::iterator ext
            = extensions.begin(); ext != extensions.end(); ++ext)
        {
        tryPath = *p;
        tryPath += name;
        tryPath += *ext;
        if(SystemTools::FileExists(tryPath.c_str()) &&
           !SystemTools::FileIsDirectory(tryPath.c_str()))
          {
          return SystemTools::CollapseFullPath(tryPath.c_str());
          }
        }
      }
    // now try it without them
    tryPath = *p;
    tryPath += name;
    if(SystemTools::FileExists(tryPath.c_str()) &&
       !SystemTools::FileIsDirectory(tryPath.c_str()))
      {
      return SystemTools::CollapseFullPath(tryPath.c_str());
      }
    }
  // Couldn't find the program.
  return "";
}

kwsys_stl::string SystemTools::FindProgram(
  const kwsys_stl::vector<kwsys_stl::string>& names,
  const kwsys_stl::vector<kwsys_stl::string>& path,
  bool noSystemPath)
{
  for(kwsys_stl::vector<kwsys_stl::string>::const_iterator it = names.begin();
      it != names.end() ; ++it)
    {
    // Try to find the program.
    kwsys_stl::string result = SystemTools::FindProgram(it->c_str(),
                                                  path,
                                                  noSystemPath);
    if ( !result.empty() )
      {
      return result;
      }
    }
  return "";
}

/**
 * Find the library with the given name.  Searches the given path and then
 * the system search path.  Returns the full path to the library if it is
 * found.  Otherwise, the empty string is returned.
 */
kwsys_stl::string SystemTools
::FindLibrary(const char* name,
              const kwsys_stl::vector<kwsys_stl::string>& userPaths)
{
  // See if the executable exists as written.
  if(SystemTools::FileExists(name) &&
     !SystemTools::FileIsDirectory(name))
    {
    return SystemTools::CollapseFullPath(name);
    }

  // Add the system search path to our path.
  kwsys_stl::vector<kwsys_stl::string> path;
  SystemTools::GetPath(path);
   // now add the additional paths
  {
  for(kwsys_stl::vector<kwsys_stl::string>::const_iterator i = userPaths.begin();
        i != userPaths.end(); ++i)
    {
    path.push_back(*i);
    }
  }
  // Add a trailing slash to all paths to aid the search process.
  {
  for(kwsys_stl::vector<kwsys_stl::string>::iterator i = path.begin();
      i != path.end(); ++i)
    {
    kwsys_stl::string& p = *i;
    if(p.empty() || p[p.size()-1] != '/')
      {
      p += "/";
      }
    }
  }
  kwsys_stl::string tryPath;
  for(kwsys_stl::vector<kwsys_stl::string>::const_iterator p = path.begin();
      p != path.end(); ++p)
    {
#if defined(__APPLE__)
    tryPath = *p;
    tryPath += name;
    tryPath += ".framework";
    if(SystemTools::FileExists(tryPath.c_str())
       && SystemTools::FileIsDirectory(tryPath.c_str()))
      {
      return SystemTools::CollapseFullPath(tryPath.c_str());
      }
#endif
#if defined(_WIN32) && !defined(__CYGWIN__) && !defined(__MINGW32__)
    tryPath = *p;
    tryPath += name;
    tryPath += ".lib";
    if(SystemTools::FileExists(tryPath.c_str())
       && !SystemTools::FileIsDirectory(tryPath.c_str()))
      {
      return SystemTools::CollapseFullPath(tryPath.c_str());
      }
#else
    tryPath = *p;
    tryPath += "lib";
    tryPath += name;
    tryPath += ".so";
    if(SystemTools::FileExists(tryPath.c_str())
       && !SystemTools::FileIsDirectory(tryPath.c_str()))
      {
      return SystemTools::CollapseFullPath(tryPath.c_str());
      }
    tryPath = *p;
    tryPath += "lib";
    tryPath += name;
    tryPath += ".a";
    if(SystemTools::FileExists(tryPath.c_str())
       && !SystemTools::FileIsDirectory(tryPath.c_str()))
      {
      return SystemTools::CollapseFullPath(tryPath.c_str());
      }
    tryPath = *p;
    tryPath += "lib";
    tryPath += name;
    tryPath += ".sl";
    if(SystemTools::FileExists(tryPath.c_str())
       && !SystemTools::FileIsDirectory(tryPath.c_str()))
      {
      return SystemTools::CollapseFullPath(tryPath.c_str());
      }
    tryPath = *p;
    tryPath += "lib";
    tryPath += name;
    tryPath += ".dylib";
    if(SystemTools::FileExists(tryPath.c_str())
       && !SystemTools::FileIsDirectory(tryPath.c_str()))
      {
      return SystemTools::CollapseFullPath(tryPath.c_str());
      }
    tryPath = *p;
    tryPath += "lib";
    tryPath += name;
    tryPath += ".dll";
    if(SystemTools::FileExists(tryPath.c_str())
       && !SystemTools::FileIsDirectory(tryPath.c_str()))
      {
      return SystemTools::CollapseFullPath(tryPath.c_str());
      }
#endif
    }

  // Couldn't find the library.
  return "";
}

kwsys_stl::string SystemTools::GetRealPath(const char* path)
{
  kwsys_stl::string ret;
  Realpath(path, ret);
  return ret;
}

bool SystemTools::FileIsDirectory(const char* name)
{
  size_t length = strlen(name);
  if (length == 0)
    {
    return false;
    }

  // Remove any trailing slash from the name except in a root component.
  char local_buffer[KWSYS_SYSTEMTOOLS_MAXPATH];
  std::string string_buffer;
  size_t last = length-1;
  if(last > 0 && (name[last] == '/' || name[last] == '\\')
    && strcmp(name, "/") !=0 && name[last-1] != ':')
    {
    if(last < sizeof(local_buffer))
      {
      memcpy(local_buffer, name, last);
      local_buffer[last] = 0;
      name = local_buffer;
      }
    else
      {
      string_buffer.append(name, last);
      name = string_buffer.c_str();
      }
    }

  // Now check the file node type.
  struct stat fs;
  if(stat(name, &fs) == 0)
    {
#if defined( _WIN32 ) && !defined(__CYGWIN__)
    return ((fs.st_mode & _S_IFDIR) != 0);
#else
    return S_ISDIR(fs.st_mode);
#endif
    }
  else
    {
    return false;
    }
}

bool SystemTools::FileIsSymlink(const char* name)
{
#if defined( _WIN32 )
  (void)name;
  return false;
#else
  struct stat fs;
  if(lstat(name, &fs) == 0)
    {
    return S_ISLNK(fs.st_mode);
    }
  else
    {
    return false;
    }
#endif
}

#if defined(_WIN32) && !defined(__CYGWIN__)
bool SystemTools::CreateSymlink(const char*, const char*)
{
  return false;
}
#else
bool SystemTools::CreateSymlink(const char* origName, const char* newName)
{
  return symlink(origName, newName) >= 0;
}
#endif

#if defined(_WIN32) && !defined(__CYGWIN__)
bool SystemTools::ReadSymlink(const char*, kwsys_stl::string&)
{
  return false;
}
#else
bool SystemTools::ReadSymlink(const char* newName,
                              kwsys_stl::string& origName)
{
  char buf[KWSYS_SYSTEMTOOLS_MAXPATH+1];
  int count =
    static_cast<int>(readlink(newName, buf, KWSYS_SYSTEMTOOLS_MAXPATH));
  if(count >= 0)
    {
    // Add null-terminator.
    buf[count] = 0;
    origName = buf;
    return true;
    }
  else
    {
    return false;
    }
}
#endif

int SystemTools::ChangeDirectory(const char *dir)
{
  return Chdir(dir);
}

kwsys_stl::string SystemTools::GetCurrentWorkingDirectory(bool collapse)
{
  char buf[2048];
  const char* cwd = Getcwd(buf, 2048);
  kwsys_stl::string path;
  if ( cwd )
    {
    path = cwd;
    }
  if(collapse)
    {
    return SystemTools::CollapseFullPath(path.c_str());
    }
  return path;
}

kwsys_stl::string SystemTools::GetProgramPath(const char* in_name)
{
  kwsys_stl::string dir, file;
  SystemTools::SplitProgramPath(in_name, dir, file);
  return dir;
}

bool SystemTools::SplitProgramPath(const char* in_name,
                                   kwsys_stl::string& dir,
                                   kwsys_stl::string& file,
                                   bool)
{
  dir = in_name;
  file = "";
  SystemTools::ConvertToUnixSlashes(dir);

  if(!SystemTools::FileIsDirectory(dir.c_str()))
    {
    kwsys_stl::string::size_type slashPos = dir.rfind("/");
    if(slashPos != kwsys_stl::string::npos)
      {
      file = dir.substr(slashPos+1);
      dir = dir.substr(0, slashPos);
      }
    else
      {
      file = dir;
      dir = "";
      }
    }
  if(!(dir == "") && !SystemTools::FileIsDirectory(dir.c_str()))
    {
    kwsys_stl::string oldDir = in_name;
    SystemTools::ConvertToUnixSlashes(oldDir);
    dir = in_name;
    return false;
    }
  return true;
}

bool SystemTools::FindProgramPath(const char* argv0,
                                  kwsys_stl::string& pathOut,
                                  kwsys_stl::string& errorMsg,
                                  const char* exeName,
                                  const char* buildDir,
                                  const char* installPrefix )
{
  kwsys_stl::vector<kwsys_stl::string> failures;
  kwsys_stl::string self = argv0 ? argv0 : "";
  failures.push_back(self);
  SystemTools::ConvertToUnixSlashes(self);
  self = SystemTools::FindProgram(self.c_str());
  if(!SystemTools::FileExists(self.c_str()))
    {
    if(buildDir)
      {
      kwsys_stl::string intdir = ".";
#ifdef  CMAKE_INTDIR
      intdir = CMAKE_INTDIR;
#endif
      self = buildDir;
      self += "/bin/";
      self += intdir;
      self += "/";
      self += exeName;
      self += SystemTools::GetExecutableExtension();
      }
    }
  if(installPrefix)
    {
    if(!SystemTools::FileExists(self.c_str()))
      {
      failures.push_back(self);
      self = installPrefix;
      self += "/bin/";
      self +=  exeName;
      }
    }
  if(!SystemTools::FileExists(self.c_str()))
    {
    failures.push_back(self);
    kwsys_ios::ostringstream msg;
    msg << "Can not find the command line program ";
    if (exeName)
      {
      msg << exeName;
      }
    msg << "\n";
    if (argv0)
      {
      msg << "  argv[0] = \"" << argv0 << "\"\n";
      }
    msg << "  Attempted paths:\n";
    kwsys_stl::vector<kwsys_stl::string>::iterator i;
    for(i=failures.begin(); i != failures.end(); ++i)
      {
      msg << "    \"" << i->c_str() << "\"\n";
      }
    errorMsg = msg.str();
    return false;
    }
  pathOut = self;
  return true;
}


kwsys_stl::string SystemTools::CollapseFullPath(const char* in_relative)
{
  return SystemTools::CollapseFullPath(in_relative, 0);
}

void SystemTools::AddTranslationPath(const char * a, const char * b)
{
  kwsys_stl::string path_a = a;
  kwsys_stl::string path_b = b;
  SystemTools::ConvertToUnixSlashes(path_a);
  SystemTools::ConvertToUnixSlashes(path_b);
  // First check this is a directory path, since we don't want the table to
  // grow too fat
  if( SystemTools::FileIsDirectory( path_a.c_str() ) )
    {
    // Make sure the path is a full path and does not contain no '..'
    // Ken--the following code is incorrect. .. can be in a valid path
    // for example  /home/martink/MyHubba...Hubba/Src
    if( SystemTools::FileIsFullPath(path_b.c_str()) && path_b.find("..")
        == kwsys_stl::string::npos )
      {
      // Before inserting make sure path ends with '/'
      if(path_a.size() && path_a[path_a.size() -1] != '/')
        {
        path_a += '/';
        }
      if(path_b.size() && path_b[path_b.size() -1] != '/')
        {
        path_b += '/';
        }
      if( !(path_a == path_b) )
        {
        SystemTools::TranslationMap->insert(
          SystemToolsTranslationMap::value_type(path_a, path_b));
        }
      }
    }
}

void SystemTools::AddKeepPath(const char* dir)
{
  kwsys_stl::string cdir;
  Realpath(SystemTools::CollapseFullPath(dir).c_str(), cdir);
  SystemTools::AddTranslationPath(cdir.c_str(), dir);
}

void SystemTools::CheckTranslationPath(kwsys_stl::string & path)
{
  // Do not translate paths that are too short to have meaningful
  // translations.
  if(path.size() < 2)
    {
    return;
    }

  // Always add a trailing slash before translation.  It does not
  // matter if this adds an extra slash, but we do not want to
  // translate part of a directory (like the foo part of foo-dir).
  path += "/";

  // In case a file was specified we still have to go through this:
  // Now convert any path found in the table back to the one desired:
  kwsys_stl::map<kwsys_stl::string,kwsys_stl::string>::const_iterator it;
  for(it  = SystemTools::TranslationMap->begin();
      it != SystemTools::TranslationMap->end();
      ++it )
    {
    // We need to check of the path is a substring of the other path
    if(path.find( it->first ) == 0)
      {
      path = path.replace( 0, it->first.size(), it->second);
      }
    }

  // Remove the trailing slash we added before.
  path.erase(path.end()-1, path.end());
}

static void
SystemToolsAppendComponents(
  kwsys_stl::vector<kwsys_stl::string>& out_components,
  kwsys_stl::vector<kwsys_stl::string>::const_iterator first,
  kwsys_stl::vector<kwsys_stl::string>::const_iterator last)
{
  for(kwsys_stl::vector<kwsys_stl::string>::const_iterator i = first;
      i != last; ++i)
    {
    if(*i == "..")
      {
      if(out_components.begin() != out_components.end())
        {
        out_components.erase(out_components.end()-1, out_components.end());
        }
      }
    else if(!(*i == ".") && !(*i == ""))
      {
      out_components.push_back(*i);
      }
    }
}

kwsys_stl::string SystemTools::CollapseFullPath(const char* in_path,
                                                const char* in_base)
{
  // Collect the output path components.
  kwsys_stl::vector<kwsys_stl::string> out_components;

  // Split the input path components.
  kwsys_stl::vector<kwsys_stl::string> path_components;
  SystemTools::SplitPath(in_path, path_components);

  // If the input path is relative, start with a base path.
  if(path_components[0].length() == 0)
    {
    kwsys_stl::vector<kwsys_stl::string> base_components;
    if(in_base)
      {
      // Use the given base path.
      SystemTools::SplitPath(in_base, base_components);
      }
    else
      {
      // Use the current working directory as a base path.
      char buf[2048];
      if(const char* cwd = Getcwd(buf, 2048))
        {
        SystemTools::SplitPath(cwd, base_components);
        }
      else
        {
        base_components.push_back("");
        }
      }

    // Append base path components to the output path.
    out_components.push_back(base_components[0]);
    SystemToolsAppendComponents(out_components,
                                base_components.begin()+1,
                                base_components.end());
    }

  // Append input path components to the output path.
  SystemToolsAppendComponents(out_components,
                              path_components.begin(),
                              path_components.end());

  // Transform the path back to a string.
  kwsys_stl::string newPath = SystemTools::JoinPath(out_components);

  // Update the translation table with this potentially new path.  I am not
  // sure why this line is here, it seems really questionable, but yet I
  // would put good money that if I remove it something will break, basically
  // from what I can see it created a mapping from the collapsed path, to be
  // replaced by the input path, which almost completely does the opposite of
  // this function, the only thing preventing this from happening a lot is
  // that if the in_path has a .. in it, then it is not added to the
  // translation table. So for most calls this either does nothing due to the
  // ..  or it adds a translation between identical paths as nothing was
  // collapsed, so I am going to try to comment it out, and see what hits the
  // fan, hopefully quickly.
  // Commented out line below:
  //SystemTools::AddTranslationPath(newPath.c_str(), in_path);

  SystemTools::CheckTranslationPath(newPath);
#ifdef _WIN32
  newPath = SystemTools::GetActualCaseForPath(newPath.c_str());
  SystemTools::ConvertToUnixSlashes(newPath);
#endif
  // Return the reconstructed path.
  return newPath;
}

// compute the relative path from here to there
kwsys_stl::string SystemTools::RelativePath(const char* local, const char* remote)
{
  if(!SystemTools::FileIsFullPath(local))
    {
    return "";
    }
  if(!SystemTools::FileIsFullPath(remote))
    {
    return "";
    }

  // split up both paths into arrays of strings using / as a separator
  kwsys_stl::vector<kwsys::String> localSplit = SystemTools::SplitString(local, '/', true);
  kwsys_stl::vector<kwsys::String> remoteSplit = SystemTools::SplitString(remote, '/', true);
  kwsys_stl::vector<kwsys::String> commonPath; // store shared parts of path in this array
  kwsys_stl::vector<kwsys::String> finalPath;  // store the final relative path here
  // count up how many matching directory names there are from the start
  unsigned int sameCount = 0;
  while(
    ((sameCount <= (localSplit.size()-1)) && (sameCount <= (remoteSplit.size()-1)))
    &&
// for windows and apple do a case insensitive string compare
#if defined(_WIN32) || defined(__APPLE__)
    SystemTools::Strucmp(localSplit[sameCount].c_str(),
                         remoteSplit[sameCount].c_str()) == 0
#else
    localSplit[sameCount] == remoteSplit[sameCount]
#endif
    )
    {
    // put the common parts of the path into the commonPath array
    commonPath.push_back(localSplit[sameCount]);
    // erase the common parts of the path from the original path arrays
    localSplit[sameCount] = "";
    remoteSplit[sameCount] = "";
    sameCount++;
    }

  // If there is nothing in common at all then just return the full
  // path.  This is the case only on windows when the paths have
  // different drive letters.  On unix two full paths always at least
  // have the root "/" in common so we will return a relative path
  // that passes through the root directory.
  if(sameCount == 0)
    {
    return remote;
    }

  // for each entry that is not common in the local path
  // add a ../ to the finalpath array, this gets us out of the local
  // path into the remote dir
  for(unsigned int i = 0; i < localSplit.size(); ++i)
    {
    if(localSplit[i].size())
      {
      finalPath.push_back("../");
      }
    }
  // for each entry that is not common in the remote path add it
  // to the final path.
  for(kwsys_stl::vector<String>::iterator vit = remoteSplit.begin();
      vit != remoteSplit.end(); ++vit)
    {
    if(vit->size())
      {
      finalPath.push_back(*vit);
      }
    }
  kwsys_stl::string relativePath;     // result string
  // now turn the array of directories into a unix path by puttint /
  // between each entry that does not already have one
  for(kwsys_stl::vector<String>::iterator vit1 = finalPath.begin();
      vit1 != finalPath.end(); ++vit1)
    {
    if(relativePath.size() && relativePath[relativePath.size()-1] != '/')
      {
      relativePath += "/";
      }
    relativePath += *vit1;
    }
  return relativePath;
}

#ifdef _WIN32
static int GetCasePathName(const kwsys_stl::string & pathIn,
                            kwsys_stl::string & casePath)
{
  kwsys_stl::vector<kwsys_stl::string> path_components;
  SystemTools::SplitPath(pathIn.c_str(), path_components);
  if(path_components[0].empty()) // First component always exists.
    {
    // Relative paths cannot be converted.
    casePath = "";
    return 0;
    }

  // Start with root component.
  kwsys_stl::vector<kwsys_stl::string>::size_type idx = 0;
  casePath = path_components[idx++];
  const char* sep = "";

  // If network path, fill casePath with server/share so FindFirstFile
  // will work after that.  Maybe someday call other APIs to get
  // actual case of servers and shares.
  if(path_components.size() > 2 && path_components[0] == "//")
    {
    casePath += path_components[idx++];
    casePath += "/";
    casePath += path_components[idx++];
    sep = "/";
    }

  for(; idx < path_components.size(); idx++)
    {
    casePath += sep;
    sep = "/";
    kwsys_stl::string test_str = casePath;
    test_str += path_components[idx];

    WIN32_FIND_DATA findData;
    HANDLE hFind = ::FindFirstFile(test_str.c_str(), &findData);
    if (INVALID_HANDLE_VALUE != hFind)
      {
      casePath += findData.cFileName;
      ::FindClose(hFind);
      }
    else
      {
      casePath = "";
      return 0;
      }
    }
  return (int)casePath.size();
}
#endif


//----------------------------------------------------------------------------
kwsys_stl::string SystemTools::GetActualCaseForPath(const char* p)
{
#ifndef _WIN32
  return p;
#else
  kwsys_stl::string casePath = p;
  // make sure drive letter is always upper case
  if(casePath.size() > 1 && casePath[1] == ':')
    {
    casePath[0] = toupper(casePath[0]);
    }

  // Check to see if actual case has already been called
  // for this path, and the result is stored in the LongPathMap
  SystemToolsTranslationMap::iterator i =
    SystemTools::LongPathMap->find(casePath);
  if(i != SystemTools::LongPathMap->end())
    {
    return i->second;
    }
  int len = GetCasePathName(p, casePath);
  if(len == 0 || len > MAX_PATH+1)
    {
    return p;
    }
  (*SystemTools::LongPathMap)[p] = casePath;
  return casePath;
#endif
}

//----------------------------------------------------------------------------
const char* SystemTools::SplitPathRootComponent(const char* p,
                                                kwsys_stl::string* root)
{
  // Identify the root component.
  const char* c = p;
  if((c[0] == '/' && c[1] == '/') || (c[0] == '\\' && c[1] == '\\'))
    {
    // Network path.
    if(root)
      {
      *root = "//";
      }
    c += 2;
    }
  else if(c[0] == '/' || c[0] == '\\')
    {
    // Unix path (or Windows path w/out drive letter).
    if(root)
      {
      *root = "/";
      }
    c += 1;
    }
  else if(c[0] && c[1] == ':' && (c[2] == '/' || c[2] == '\\'))
    {
    // Windows path.
    if(root)
      {
      (*root) = "_:/";
      (*root)[0] = c[0];
      }
    c += 3;
    }
  else if(c[0] && c[1] == ':')
    {
    // Path relative to a windows drive working directory.
    if(root)
      {
      (*root) = "_:";
      (*root)[0] = c[0];
      }
    c += 2;
    }
  else if(c[0] == '~')
    {
    // Home directory.  The returned root should always have a
    // trailing slash so that appending components as
    // c[0]c[1]/c[2]/... works.  The remaining path returned should
    // skip the first slash if it exists:
    //
    //   "~"    : root = "~/" , return ""
    //   "~/    : root = "~/" , return ""
    //   "~/x   : root = "~/" , return "x"
    //   "~u"   : root = "~u/", return ""
    //   "~u/"  : root = "~u/", return ""
    //   "~u/x" : root = "~u/", return "x"
    size_t n = 1;
    while(c[n] && c[n] != '/')
      {
      ++n;
      }
    if(root)
      {
      root->assign(c, n);
      *root += '/';
      }
    if(c[n] == '/')
      {
      ++n;
      }
    c += n;
    }
  else
    {
    // Relative path.
    if(root)
      {
      *root = "";
      }
    }

  // Return the remaining path.
  return c;
}

//----------------------------------------------------------------------------
void SystemTools::SplitPath(const char* p,
                            kwsys_stl::vector<kwsys_stl::string>& components,
                            bool expand_home_dir)
{
  const char* c = p;
  components.clear();

  // Identify the root component.
  {
  kwsys_stl::string root;
  c = SystemTools::SplitPathRootComponent(c, &root);

  // Expand home directory references if requested.
  if(expand_home_dir && !root.empty() && root[0] == '~')
    {
    kwsys_stl::string homedir;
    root = root.substr(0, root.size()-1);
    if(root.size() == 1)
      {
#if defined(_WIN32) && !defined(__CYGWIN__)
      if(const char* userp = getenv("USERPROFILE"))
        {
        homedir = userp;
        }
      else
#endif
      if(const char* h = getenv("HOME"))
        {
        homedir = h;
        }
      }
#ifdef HAVE_GETPWNAM
    else if(passwd* pw = getpwnam(root.c_str()+1))
      {
      if(pw->pw_dir)
        {
        homedir = pw->pw_dir;
        }
      }
#endif
    if(!homedir.empty() && (homedir[homedir.size()-1] == '/' ||
                            homedir[homedir.size()-1] == '\\'))
      {
      homedir = homedir.substr(0, homedir.size()-1);
      }
    SystemTools::SplitPath(homedir.c_str(), components);
    }
  else
    {
    components.push_back(root);
    }
  }

  // Parse the remaining components.
  const char* first = c;
  const char* last = first;
  for(;*last; ++last)
    {
    if(*last == '/' || *last == '\\')
      {
      // End of a component.  Save it.
      components.push_back(
        kwsys_stl::string(first,static_cast<kwsys_stl::string::size_type>(
                            last-first)));
      first = last+1;
      }
    }

  // Save the last component unless there were no components.
  if(last != c)
    {
    components.push_back(
      kwsys_stl::string(first,static_cast<kwsys_stl::string::size_type>(
                          last-first)));
    }
}

//----------------------------------------------------------------------------
kwsys_stl::string
SystemTools::JoinPath(const kwsys_stl::vector<kwsys_stl::string>& components)
{
  return SystemTools::JoinPath(components.begin(), components.end());
}

//----------------------------------------------------------------------------
kwsys_stl::string
SystemTools
::JoinPath(kwsys_stl::vector<kwsys_stl::string>::const_iterator first,
           kwsys_stl::vector<kwsys_stl::string>::const_iterator last)
{
  // Construct result in a single string.
  kwsys_stl::string result;

  // The first two components do not add a slash.
  if(first != last)
    {
    result.append(*first++);
    }
  if(first != last)
    {
    result.append(*first++);
    }

  // All remaining components are always separated with a slash.
  while(first != last)
    {
    result.append("/");
    result.append((*first++));
    }

  // Return the concatenated result.
  return result;
}

//----------------------------------------------------------------------------
bool SystemTools::ComparePath(const char* c1, const char* c2)
{
#if defined(_WIN32) || defined(__APPLE__)
# ifdef _MSC_VER
  return _stricmp(c1, c2) == 0;
# elif defined(__APPLE__) || defined(__GNUC__)
  return strcasecmp(c1, c2) == 0;
#else
  return SystemTools::Strucmp(c1, c2) == 0;
# endif
#else
  return strcmp(c1, c2) == 0;
#endif
}

//----------------------------------------------------------------------------
bool SystemTools::Split(const char* str, kwsys_stl::vector<kwsys_stl::string>& lines, char separator)
{
  kwsys_stl::string data(str);
  kwsys_stl::string::size_type lpos = 0;
  while(lpos < data.length())
    {
    kwsys_stl::string::size_type rpos = data.find_first_of(separator, lpos);
    if(rpos == kwsys_stl::string::npos)
      {
      // Line ends at end of string without a newline.
      lines.push_back(data.substr(lpos));
      return false;
      }
    else
      {
      // Line ends in a "\n", remove the character.
      lines.push_back(data.substr(lpos, rpos-lpos));
      }
    lpos = rpos+1;
    }
  return true;
}

//----------------------------------------------------------------------------
bool SystemTools::Split(const char* str, kwsys_stl::vector<kwsys_stl::string>& lines)
{
  kwsys_stl::string data(str);
  kwsys_stl::string::size_type lpos = 0;
  while(lpos < data.length())
    {
    kwsys_stl::string::size_type rpos = data.find_first_of("\n", lpos);
    if(rpos == kwsys_stl::string::npos)
      {
      // Line ends at end of string without a newline.
      lines.push_back(data.substr(lpos));
      return false;
      }
    if((rpos > lpos) && (data[rpos-1] == '\r'))
      {
      // Line ends in a "\r\n" pair, remove both characters.
      lines.push_back(data.substr(lpos, (rpos-1)-lpos));
      }
    else
      {
      // Line ends in a "\n", remove the character.
      lines.push_back(data.substr(lpos, rpos-lpos));
      }
    lpos = rpos+1;
    }
  return true;
}

/**
 * Return path of a full filename (no trailing slashes).
 * Warning: returned path is converted to Unix slashes format.
 */
kwsys_stl::string SystemTools::GetFilenamePath(const kwsys_stl::string& filename)
{
  kwsys_stl::string fn = filename;
  SystemTools::ConvertToUnixSlashes(fn);

  kwsys_stl::string::size_type slash_pos = fn.rfind("/");
  if(slash_pos != kwsys_stl::string::npos)
    {
    kwsys_stl::string  ret = fn.substr(0, slash_pos);
    if(ret.size() == 2 && ret[1] == ':')
      {
      return ret + '/';
      }
    if(ret.size() == 0)
      {
      return "/";
      }
    return ret;
    }
  else
    {
    return "";
    }
}


/**
 * Return file name of a full filename (i.e. file name without path).
 */
kwsys_stl::string SystemTools::GetFilenameName(const kwsys_stl::string& filename)
{
#if defined(_WIN32)
  kwsys_stl::string::size_type slash_pos = filename.find_last_of("/\\");
#else
  kwsys_stl::string::size_type slash_pos = filename.find_last_of("/");
#endif
  if(slash_pos != kwsys_stl::string::npos)
    {
    return filename.substr(slash_pos + 1);
    }
  else
    {
    return filename;
    }
}


/**
 * Return file extension of a full filename (dot included).
 * Warning: this is the longest extension (for example: .tar.gz)
 */
kwsys_stl::string SystemTools::GetFilenameExtension(const kwsys_stl::string& filename)
{
  kwsys_stl::string name = SystemTools::GetFilenameName(filename);
  kwsys_stl::string::size_type dot_pos = name.find(".");
  if(dot_pos != kwsys_stl::string::npos)
    {
    return name.substr(dot_pos);
    }
  else
    {
    return "";
    }
}

/**
 * Return file extension of a full filename (dot included).
 * Warning: this is the shortest extension (for example: .gz of .tar.gz)
 */
kwsys_stl::string SystemTools::GetFilenameLastExtension(const kwsys_stl::string& filename)
{
  kwsys_stl::string name = SystemTools::GetFilenameName(filename);
  kwsys_stl::string::size_type dot_pos = name.rfind(".");
  if(dot_pos != kwsys_stl::string::npos)
    {
    return name.substr(dot_pos);
    }
  else
    {
    return "";
    }
}

/**
 * Return file name without extension of a full filename (i.e. without path).
 * Warning: it considers the longest extension (for example: .tar.gz)
 */
kwsys_stl::string SystemTools::GetFilenameWithoutExtension(const kwsys_stl::string& filename)
{
  kwsys_stl::string name = SystemTools::GetFilenameName(filename);
  kwsys_stl::string::size_type dot_pos = name.find(".");
  if(dot_pos != kwsys_stl::string::npos)
    {
    return name.substr(0, dot_pos);
    }
  else
    {
    return name;
    }
}


/**
 * Return file name without extension of a full filename (i.e. without path).
 * Warning: it considers the last extension (for example: removes .gz
 * from .tar.gz)
 */
kwsys_stl::string
SystemTools::GetFilenameWithoutLastExtension(const kwsys_stl::string& filename)
{
  kwsys_stl::string name = SystemTools::GetFilenameName(filename);
  kwsys_stl::string::size_type dot_pos = name.rfind(".");
  if(dot_pos != kwsys_stl::string::npos)
    {
    return name.substr(0, dot_pos);
    }
  else
    {
    return name;
    }
}

bool SystemTools::FileHasSignature(const char *filename,
                                   const char *signature,
                                   long offset)
{
  if (!filename || !signature)
    {
    return false;
    }

  FILE *fp;
  fp = fopen(filename, "rb");
  if (!fp)
    {
    return false;
    }

  fseek(fp, offset, SEEK_SET);

  bool res = false;
  size_t signature_len = strlen(signature);
  char *buffer = new char [signature_len];

  if (fread(buffer, 1, signature_len, fp) == signature_len)
    {
    res = (!strncmp(buffer, signature, signature_len) ? true : false);
    }

  delete [] buffer;

  fclose(fp);
  return res;
}

SystemTools::FileTypeEnum
SystemTools::DetectFileType(const char *filename,
                            unsigned long length,
                            double percent_bin)
{
  if (!filename || percent_bin < 0)
    {
    return SystemTools::FileTypeUnknown;
    }

  FILE *fp;
  fp = fopen(filename, "rb");
  if (!fp)
    {
    return SystemTools::FileTypeUnknown;
    }

  // Allocate buffer and read bytes

  unsigned char *buffer = new unsigned char [length];
  size_t read_length = fread(buffer, 1, length, fp);
  fclose(fp);
  if (read_length == 0)
    {
    return SystemTools::FileTypeUnknown;
    }

  // Loop over contents and count

  size_t text_count = 0;

  const unsigned char *ptr = buffer;
  const unsigned char *buffer_end = buffer + read_length;

  while (ptr != buffer_end)
    {
    if ((*ptr >= 0x20 && *ptr <= 0x7F) ||
        *ptr == '\n' ||
        *ptr == '\r' ||
        *ptr == '\t')
      {
      text_count++;
      }
    ptr++;
    }

  delete [] buffer;

  double current_percent_bin =
    (static_cast<double>(read_length - text_count) /
     static_cast<double>(read_length));

  if (current_percent_bin >= percent_bin)
    {
    return SystemTools::FileTypeBinary;
    }

  return SystemTools::FileTypeText;
}

bool SystemTools::LocateFileInDir(const char *filename,
                                  const char *dir,
                                  kwsys_stl::string& filename_found,
                                  int try_filename_dirs)
{
  if (!filename || !dir)
    {
    return false;
    }

  // Get the basename of 'filename'

  kwsys_stl::string filename_base = SystemTools::GetFilenameName(filename);

  // Check if 'dir' is really a directory
  // If win32 and matches something like C:, accept it as a dir

  kwsys_stl::string real_dir;
  if (!SystemTools::FileIsDirectory(dir))
    {
#if defined( _WIN32 )
    size_t dir_len = strlen(dir);
    if (dir_len < 2 || dir[dir_len - 1] != ':')
      {
#endif
      real_dir = SystemTools::GetFilenamePath(dir);
      dir = real_dir.c_str();
#if defined( _WIN32 )
      }
#endif
    }

  // Try to find the file in 'dir'

  bool res = false;
  if (filename_base.size() && dir)
    {
    size_t dir_len = strlen(dir);
    int need_slash =
      (dir_len && dir[dir_len - 1] != '/' && dir[dir_len - 1] != '\\');

    kwsys_stl::string temp = dir;
    if (need_slash)
      {
      temp += "/";
      }
    temp += filename_base;

    if (SystemTools::FileExists(temp.c_str()))
      {
      res = true;
      filename_found = temp;
      }

    // If not found, we can try harder by appending part of the file to
    // to the directory to look inside.
    // Example: if we were looking for /foo/bar/yo.txt in /d1/d2, then
    // try to find yo.txt in /d1/d2/bar, then /d1/d2/foo/bar, etc.

    else if (try_filename_dirs)
      {
      kwsys_stl::string filename_dir(filename);
      kwsys_stl::string filename_dir_base;
      kwsys_stl::string filename_dir_bases;
      do
        {
        filename_dir = SystemTools::GetFilenamePath(filename_dir);
        filename_dir_base = SystemTools::GetFilenameName(filename_dir);
#if defined( _WIN32 )
        if (!filename_dir_base.size() ||
            filename_dir_base[filename_dir_base.size() - 1] == ':')
#else
        if (!filename_dir_base.size())
#endif
          {
          break;
          }

        filename_dir_bases = filename_dir_base + "/" + filename_dir_bases;

        temp = dir;
        if (need_slash)
          {
          temp += "/";
          }
        temp += filename_dir_bases;

        res = SystemTools::LocateFileInDir(
          filename_base.c_str(), temp.c_str(), filename_found, 0);

        } while (!res && filename_dir_base.size());
      }
    }

  return res;
}

bool SystemTools::FileIsFullPath(const char* in_name)
{
  kwsys_stl::string name = in_name;
#if defined(_WIN32) || defined(__CYGWIN__)
  // On Windows, the name must be at least two characters long.
  if(name.length() < 2)
    {
    return false;
    }
  if(name[1] == ':')
    {
    return true;
    }
  if(name[0] == '\\')
    {
    return true;
    }
#else
  // On UNIX, the name must be at least one character long.
  if(name.length() < 1)
    {
    return false;
    }
#endif
#if !defined(_WIN32)
  if(name[0] == '~')
    {
    return true;
    }
#endif
  // On UNIX, the name must begin in a '/'.
  // On Windows, if the name begins in a '/', then it is a full
  // network path.
  if(name[0] == '/')
    {
    return true;
    }
  return false;
}

bool SystemTools::GetShortPath(const char* path, kwsys_stl::string& shortPath)
{
#if defined(WIN32) && !defined(__CYGWIN__)
  const int size = int(strlen(path)) +1; // size of return
  char *buffer = new char[size];  // create a buffer
  char *tempPath = new char[size];  // create a buffer
  int ret;

  // if the path passed in has quotes around it, first remove the quotes
  if (path[0] == '"' && path[strlen(path)-1] == '"')
    {
    strcpy(tempPath,path+1);
    tempPath[strlen(tempPath)-1] = '\0';
    }
  else
    {
    strcpy(tempPath,path);
    }

  buffer[0] = 0;
  ret = GetShortPathName(tempPath, buffer, size);

  if(buffer[0] == 0 || ret > size)
    {
    delete [] buffer;
    delete [] tempPath;
    return false;
    }
  else
    {
    shortPath = buffer;
    delete [] buffer;
    delete [] tempPath;
    return true;
    }
#else
  shortPath = path;
  return true;
#endif
}

void SystemTools::SplitProgramFromArgs(const char* path,
                                       kwsys_stl::string& program, kwsys_stl::string& args)
{
  // see if this is a full path to a program
  // if so then set program to path and args to nothing
  if(SystemTools::FileExists(path))
    {
    program = path;
    args = "";
    return;
    }
  // Try to find the program in the path, note the program
  // may have spaces in its name so we have to look for it
  kwsys_stl::vector<kwsys_stl::string> e;
  kwsys_stl::string findProg = SystemTools::FindProgram(path, e);
  if(findProg.size())
    {
    program = findProg;
    args = "";
    return;
    }

  // Now try and peel off space separated chunks from the end of the string
  // so the largest path possible is found allowing for spaces in the path
  kwsys_stl::string dir = path;
  kwsys_stl::string::size_type spacePos = dir.rfind(' ');
  while(spacePos != kwsys_stl::string::npos)
    {
    kwsys_stl::string tryProg = dir.substr(0, spacePos);
    // See if the file exists
    if(SystemTools::FileExists(tryProg.c_str()))
      {
      program = tryProg;
      // remove trailing spaces from program
      kwsys_stl::string::size_type pos = program.size()-1;
      while(program[pos] == ' ')
        {
        program.erase(pos);
        pos--;
        }
      args = dir.substr(spacePos, dir.size()-spacePos);
      return;
      }
    // Now try and find the program in the path
    findProg = SystemTools::FindProgram(tryProg.c_str(), e);
    if(findProg.size())
      {
      program = findProg;
      // remove trailing spaces from program
      kwsys_stl::string::size_type pos = program.size()-1;
      while(program[pos] == ' ')
        {
        program.erase(pos);
        pos--;
        }
      args = dir.substr(spacePos, dir.size()-spacePos);
      return;
      }
    // move past the space for the next search
    spacePos--;
    spacePos = dir.rfind(' ', spacePos);
    }

  program = "";
  args = "";
}

kwsys_stl::string SystemTools::GetCurrentDateTime(const char* format)
{
  char buf[1024];
  time_t t;
  time(&t);
  strftime(buf, sizeof(buf), format, localtime(&t));
  return kwsys_stl::string(buf);
}

kwsys_stl::string SystemTools::MakeCidentifier(const char* s)
{
  kwsys_stl::string str(s);
  if (str.find_first_of("0123456789") == 0)
    {
    str = "_" + str;
    }

  kwsys_stl::string permited_chars("_"
                             "abcdefghijklmnopqrstuvwxyz"
                             "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                             "0123456789");
  kwsys_stl::string::size_type pos = 0;
  while ((pos = str.find_first_not_of(permited_chars, pos)) != kwsys_stl::string::npos)
    {
    str[pos] = '_';
    }
  return str;
}

// Due to a buggy stream library on the HP and another on Mac OS X, we
// need this very carefully written version of getline.  Returns true
// if any data were read before the end-of-file was reached.
bool SystemTools::GetLineFromStream(kwsys_ios::istream& is,
                                    kwsys_stl::string& line,
                                    bool* has_newline /* = 0 */,
                                    long sizeLimit /* = -1 */)
{
  const int bufferSize = 1024;
  char buffer[bufferSize];
  bool haveData = false;
  bool haveNewline = false;

  // Start with an empty line.
  line = "";

  long leftToRead = sizeLimit;

  // Early short circuit return if stream is no good. Just return
  // false and the empty line. (Probably means caller tried to
  // create a file stream with a non-existent file name...)
  //
  if(!is)
    {
    if(has_newline)
      {
      *has_newline = false;
      }
    return false;
    }

  // If no characters are read from the stream, the end of file has
  // been reached.  Clear the fail bit just before reading.
  while(!haveNewline &&
        leftToRead != 0 &&
        (is.clear(is.rdstate() & ~kwsys_ios::ios::failbit),
         is.getline(buffer, bufferSize), is.gcount() > 0))
    {
    // We have read at least one byte.
    haveData = true;

    // If newline character was read the gcount includes the character
    // but the buffer does not: the end of line has been reached.
    size_t length = strlen(buffer);
    if(length < static_cast<size_t>(is.gcount()))
      {
      haveNewline = true;
      }

    // Avoid storing a carriage return character.
    if(length > 0 && buffer[length-1] == '\r')
      {
      buffer[length-1] = 0;
      }

    // if we read too much then truncate the buffer
    if (leftToRead > 0)
      {
      if (static_cast<long>(length) > leftToRead)
        {
        buffer[leftToRead-1] = 0;
        leftToRead = 0;
        }
      else
        {
        leftToRead -= static_cast<long>(length);
        }
      }

    // Append the data read to the line.
    line.append(buffer);
    }

  // Return the results.
  if(has_newline)
    {
    *has_newline = haveNewline;
    }
  return haveData;
}

int SystemTools::GetTerminalWidth()
{
  int width = -1;
#ifdef HAVE_TTY_INFO
  struct winsize ws;
  char *columns; /* Unix98 environment variable */
  if(ioctl(1, TIOCGWINSZ, &ws) != -1 && ws.ws_col>0 && ws.ws_row>0)
    {
    width = ws.ws_col;
    }
  if(!isatty(STDOUT_FILENO))
    {
    width = -1;
    }
  columns = getenv("COLUMNS");
  if(columns && *columns)
    {
    long t;
    char *endptr;
    t = strtol(columns, &endptr, 0);
    if(endptr && !*endptr && (t>0) && (t<1000))
      {
      width = static_cast<int>(t);
      }
    }
  if ( width < 9 )
    {
    width = -1;
    }
#endif
  return width;
}

bool SystemTools::GetPermissions(const char* file, mode_t& mode)
{
  if ( !file )
    {
    return false;
    }

  struct stat st;
  if ( stat(file, &st) < 0 )
    {
    return false;
    }
  mode = st.st_mode;
  return true;
}

bool SystemTools::SetPermissions(const char* file, mode_t mode)
{
  if ( !file )
    {
    return false;
    }
  if ( !SystemTools::FileExists(file) )
    {
    return false;
    }
  if ( chmod(file, mode) < 0 )
    {
    return false;
    }

  return true;
}

kwsys_stl::string SystemTools::GetParentDirectory(const char* fileOrDir)
{
  return SystemTools::GetFilenamePath(fileOrDir);
}

bool SystemTools::IsSubDirectory(const char* cSubdir, const char* cDir)
{
  if(!*cDir)
    {
    return false;
    }
  kwsys_stl::string subdir = cSubdir;
  kwsys_stl::string dir = cDir;
  SystemTools::ConvertToUnixSlashes(dir);
  kwsys_stl::string path = subdir;
  do
    {
    path = SystemTools::GetParentDirectory(path.c_str());
    if(SystemTools::ComparePath(dir.c_str(), path.c_str()))
      {
      return true;
      }
    }
  while ( path.size() > dir.size() );
  return false;
}

void SystemTools::Delay(unsigned int msec)
{
#ifdef _WIN32
  Sleep(msec);
#else
  // The sleep function gives 1 second resolution and the usleep
  // function gives 1e-6 second resolution but on some platforms has a
  // maximum sleep time of 1 second.  This could be re-implemented to
  // use select with masked signals or pselect to mask signals
  // atomically.  If select is given empty sets and zero as the max
  // file descriptor but a non-zero timeout it can be used to block
  // for a precise amount of time.
  if(msec >= 1000)
    {
    sleep(msec / 1000);
    usleep((msec % 1000) * 1000);
    }
  else
    {
    usleep(msec * 1000);
    }
#endif
}

void SystemTools::ConvertWindowsCommandLineToUnixArguments(
  const char *cmd_line, int *argc, char ***argv)
{
  if (!cmd_line || !argc || !argv)
    {
    return;
    }

  // A space delimites an argument except when it is inside a quote

  (*argc) = 1;

  size_t cmd_line_len = strlen(cmd_line);

  size_t i;
  for (i = 0; i < cmd_line_len; i++)
    {
    while (isspace(cmd_line[i]) && i < cmd_line_len)
      {
      i++;
      }
    if (i < cmd_line_len)
      {
      if (cmd_line[i] == '\"')
        {
        i++;
        while (cmd_line[i] != '\"' && i < cmd_line_len)
          {
          i++;
          }
        (*argc)++;
        }
      else
        {
        while (!isspace(cmd_line[i]) && i < cmd_line_len)
          {
          i++;
          }
        (*argc)++;
        }
      }
    }

  (*argv) = new char* [(*argc) + 1];
  (*argv)[(*argc)] = NULL;

  // Set the first arg to be the exec name

  (*argv)[0] = new char [1024];
#ifdef _WIN32
  ::GetModuleFileName(0, (*argv)[0], 1024);
#else
  (*argv)[0][0] = '\0';
#endif

  // Allocate the others

  int j;
  for (j = 1; j < (*argc); j++)
    {
    (*argv)[j] = new char [cmd_line_len + 10];
    }

  // Grab the args

  size_t pos;
  int argc_idx = 1;

  for (i = 0; i < cmd_line_len; i++)
    {
    while (isspace(cmd_line[i]) && i < cmd_line_len)
      {
      i++;
      }
    if (i < cmd_line_len)
      {
      if (cmd_line[i] == '\"')
        {
        i++;
        pos = i;
        while (cmd_line[i] != '\"' && i < cmd_line_len)
          {
          i++;
          }
        memcpy((*argv)[argc_idx], &cmd_line[pos], i - pos);
        (*argv)[argc_idx][i - pos] = '\0';
        argc_idx++;
        }
      else
        {
        pos = i;
        while (!isspace(cmd_line[i]) && i < cmd_line_len)
          {
          i++;
          }
        memcpy((*argv)[argc_idx], &cmd_line[pos], i - pos);
        (*argv)[argc_idx][i - pos] = '\0';
        argc_idx++;
        }
      }
    }
 }

kwsys_stl::string SystemTools::GetOperatingSystemNameAndVersion()
{
  kwsys_stl::string res;

#ifdef _WIN32
  char buffer[256];

  OSVERSIONINFOEX osvi;
  BOOL bOsVersionInfoEx;

  // Try calling GetVersionEx using the OSVERSIONINFOEX structure.
  // If that fails, try using the OSVERSIONINFO structure.

  ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
  osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);

  bOsVersionInfoEx = GetVersionEx((OSVERSIONINFO *)&osvi);
  if (!bOsVersionInfoEx)
    {
    osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
    if (!GetVersionEx((OSVERSIONINFO *)&osvi))
      {
      return 0;
      }
    }

  switch (osvi.dwPlatformId)
    {
    // Test for the Windows NT product family.

    case VER_PLATFORM_WIN32_NT:

      // Test for the specific product family.

      if (osvi.dwMajorVersion == 6 && osvi.dwMinorVersion == 0)
        {
#if (_MSC_VER >= 1300)
        if (osvi.wProductType == VER_NT_WORKSTATION)
          {
          res += "Microsoft Windows Vista";
          }
        else
          {
          res += "Microsoft Windows Server 2008 family";
          }
#else
        res += "Microsoft Windows Vista or Windows Server 2008";
#endif
        }

      if (osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 2)
        {
        res += "Microsoft Windows Server 2003 family";
        }

      if (osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 1)
        {
        res += "Microsoft Windows XP";
        }

      if (osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 0)
        {
        res += "Microsoft Windows 2000";
        }

      if (osvi.dwMajorVersion <= 4)
        {
        res += "Microsoft Windows NT";
        }

      // Test for specific product on Windows NT 4.0 SP6 and later.

      if (bOsVersionInfoEx)
        {
        // Test for the workstation type.

#if (_MSC_VER >= 1300)
        if (osvi.wProductType == VER_NT_WORKSTATION)
          {
          if (osvi.dwMajorVersion == 4)
            {
            res += " Workstation 4.0";
            }
          else if (osvi.dwMajorVersion == 5)
            {
            if (osvi.wSuiteMask & VER_SUITE_PERSONAL)
              {
              res += " Home Edition";
              }
            else
              {
              res += " Professional";
              }
            }
          }

        // Test for the server type.

        else if (osvi.wProductType == VER_NT_SERVER)
          {
          if (osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 2)
            {
            if (osvi.wSuiteMask & VER_SUITE_DATACENTER)
              {
              res += " Datacenter Edition";
              }
            else if (osvi.wSuiteMask & VER_SUITE_ENTERPRISE)
              {
              res += " Enterprise Edition";
              }
            else if (osvi.wSuiteMask == VER_SUITE_BLADE)
              {
              res += " Web Edition";
              }
            else
              {
              res += " Standard Edition";
              }
            }

          else if (osvi.dwMajorVersion == 5 && osvi.dwMinorVersion == 0)
            {
            if (osvi.wSuiteMask & VER_SUITE_DATACENTER)
              {
              res += " Datacenter Server";
              }
            else if (osvi.wSuiteMask & VER_SUITE_ENTERPRISE)
              {
              res += " Advanced Server";
              }
            else
              {
              res += " Server";
              }
            }

          else if (osvi.dwMajorVersion <= 4)  // Windows NT 4.0
            {
            if (osvi.wSuiteMask & VER_SUITE_ENTERPRISE)
              {
              res += " Server 4.0, Enterprise Edition";
              }
            else
              {
              res += " Server 4.0";
              }
            }
          }
#endif // Visual Studio 7 and up
        }

      // Test for specific product on Windows NT 4.0 SP5 and earlier

      else
        {
        HKEY hKey;
        #define BUFSIZE 80
        char szProductType[BUFSIZE];
        DWORD dwBufLen=BUFSIZE;
        LONG lRet;

        lRet = RegOpenKeyEx(
          HKEY_LOCAL_MACHINE,
          "SYSTEM\\CurrentControlSet\\Control\\ProductOptions",
          0, KEY_QUERY_VALUE, &hKey);
        if (lRet != ERROR_SUCCESS)
          {
          return 0;
          }

        lRet = RegQueryValueEx(hKey, "ProductType", NULL, NULL,
                               (LPBYTE) szProductType, &dwBufLen);

        if ((lRet != ERROR_SUCCESS) || (dwBufLen > BUFSIZE))
          {
          return 0;
          }

        RegCloseKey(hKey);

        if (lstrcmpi("WINNT", szProductType) == 0)
          {
          res += " Workstation";
          }
        if (lstrcmpi("LANMANNT", szProductType) == 0)
          {
          res += " Server";
          }
        if (lstrcmpi("SERVERNT", szProductType) == 0)
          {
          res += " Advanced Server";
          }

        res += " ";
        sprintf(buffer, "%ld", osvi.dwMajorVersion);
        res += buffer;
        res += ".";
        sprintf(buffer, "%ld", osvi.dwMinorVersion);
        res += buffer;
        }

      // Display service pack (if any) and build number.

      if (osvi.dwMajorVersion == 4 &&
          lstrcmpi(osvi.szCSDVersion, "Service Pack 6") == 0)
        {
        HKEY hKey;
        LONG lRet;

        // Test for SP6 versus SP6a.

        lRet = RegOpenKeyEx(
          HKEY_LOCAL_MACHINE,
          "SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Hotfix\\Q246009",
          0, KEY_QUERY_VALUE, &hKey);

        if (lRet == ERROR_SUCCESS)
          {
          res += " Service Pack 6a (Build ";
          sprintf(buffer, "%ld", osvi.dwBuildNumber & 0xFFFF);
          res += buffer;
          res += ")";
          }
        else // Windows NT 4.0 prior to SP6a
          {
          res += " ";
          res += osvi.szCSDVersion;
          res += " (Build ";
          sprintf(buffer, "%ld", osvi.dwBuildNumber & 0xFFFF);
          res += buffer;
          res += ")";
          }

        RegCloseKey(hKey);
        }
      else // Windows NT 3.51 and earlier or Windows 2000 and later
        {
        res += " ";
        res += osvi.szCSDVersion;
        res += " (Build ";
        sprintf(buffer, "%ld", osvi.dwBuildNumber & 0xFFFF);
        res += buffer;
        res += ")";
        }

      break;

      // Test for the Windows 95 product family.

    case VER_PLATFORM_WIN32_WINDOWS:

      if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 0)
        {
        res += "Microsoft Windows 95";
        if (osvi.szCSDVersion[1] == 'C' || osvi.szCSDVersion[1] == 'B')
          {
          res += " OSR2";
          }
        }

      if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 10)
        {
        res += "Microsoft Windows 98";
        if (osvi.szCSDVersion[1] == 'A')
          {
          res += " SE";
          }
        }

      if (osvi.dwMajorVersion == 4 && osvi.dwMinorVersion == 90)
        {
        res += "Microsoft Windows Millennium Edition";
        }
      break;

    case VER_PLATFORM_WIN32s:

      res +=  "Microsoft Win32s";
      break;
    }
#endif

  return res;
}

// ----------------------------------------------------------------------
bool SystemTools::ParseURLProtocol( const kwsys_stl::string& URL,
                                    kwsys_stl::string& protocol,
                                    kwsys_stl::string& dataglom )
{
  // match 0 entire url
  // match 1 protocol
  // match 2 dataglom following protocol://
  kwsys::RegularExpression urlRe( VTK_URL_PROTOCOL_REGEX );

  if ( ! urlRe.find( URL ) ) return false;

  protocol = urlRe.match( 1 );
  dataglom = urlRe.match( 2 );

  return true;
}

// ----------------------------------------------------------------------
bool SystemTools::ParseURL( const kwsys_stl::string& URL,
                            kwsys_stl::string& protocol,
                            kwsys_stl::string& username,
                            kwsys_stl::string& password,
                            kwsys_stl::string& hostname,
                            kwsys_stl::string& dataport,
                            kwsys_stl::string& database )
{
  kwsys::RegularExpression urlRe( VTK_URL_REGEX );
  if ( ! urlRe.find( URL ) ) return false;

  // match 0 URL
  // match 1 protocol
  // match 2 mangled user
  // match 3 username
  // match 4 mangled password
  // match 5 password
  // match 6 hostname
  // match 7 mangled port
  // match 8 dataport
  // match 9 database name

  protocol = urlRe.match( 1 );
  username = urlRe.match( 3 );
  password = urlRe.match( 5 );
  hostname = urlRe.match( 6 );
  dataport = urlRe.match( 8 );
  database = urlRe.match( 9 );

  return true;
}

// ----------------------------------------------------------------------
// These must NOT be initialized.  Default initialization to zero is
// necessary.
static unsigned int SystemToolsManagerCount;
SystemToolsTranslationMap *SystemTools::TranslationMap;
SystemToolsTranslationMap *SystemTools::LongPathMap;
#ifdef __CYGWIN__
SystemToolsTranslationMap *SystemTools::Cyg2Win32Map;
#endif

// SystemToolsManager manages the SystemTools singleton.
// SystemToolsManager should be included in any translation unit
// that will use SystemTools or that implements the singleton
// pattern. It makes sure that the SystemTools singleton is created
// before and destroyed after all other singletons in CMake.

SystemToolsManager::SystemToolsManager()
{
  if(++SystemToolsManagerCount == 1)
    {
    SystemTools::ClassInitialize();
    }
}

SystemToolsManager::~SystemToolsManager()
{
  if(--SystemToolsManagerCount == 0)
    {
    SystemTools::ClassFinalize();
    }
}

#if defined(__VMS)
// On VMS we configure the run time C library to be more UNIX like.
// http://h71000.www7.hp.com/doc/732final/5763/5763pro_004.html
extern "C" int decc$feature_get_index(char *name);
extern "C" int decc$feature_set_value(int index, int mode, int value);
static int SetVMSFeature(char* name, int value)
{
  int i;
  errno = 0;
  i = decc$feature_get_index(name);
  return i >= 0 && (decc$feature_set_value(i, 1, value) >= 0 || errno == 0);
}
#endif

void SystemTools::ClassInitialize()
{
#ifdef __VMS
  SetVMSFeature("DECC$FILENAME_UNIX_ONLY", 1);
#endif
  // Allocate the translation map first.
  SystemTools::TranslationMap = new SystemToolsTranslationMap;
  SystemTools::LongPathMap = new SystemToolsTranslationMap;
#ifdef __CYGWIN__
  SystemTools::Cyg2Win32Map = new SystemToolsTranslationMap;
#endif

  // Add some special translation paths for unix.  These are not added
  // for windows because drive letters need to be maintained.  Also,
  // there are not sym-links and mount points on windows anyway.
#if !defined(_WIN32) || defined(__CYGWIN__)
  // The tmp path is frequently a logical path so always keep it:
  SystemTools::AddKeepPath("/tmp/");

  // If the current working directory is a logical path then keep the
  // logical name.
  if(const char* pwd = getenv("PWD"))
    {
    char buf[2048];
    if(const char* cwd = Getcwd(buf, 2048))
      {
      // The current working directory may be a logical path.  Find
      // the shortest logical path that still produces the correct
      // physical path.
      kwsys_stl::string cwd_changed;
      kwsys_stl::string pwd_changed;

      // Test progressively shorter logical-to-physical mappings.
      kwsys_stl::string pwd_str = pwd;
      kwsys_stl::string cwd_str = cwd;
      kwsys_stl::string pwd_path;
      Realpath(pwd, pwd_path);
      while(cwd_str == pwd_path && cwd_str != pwd_str)
        {
        // The current pair of paths is a working logical mapping.
        cwd_changed = cwd_str;
        pwd_changed = pwd_str;

        // Strip off one directory level and see if the logical
        // mapping still works.
        pwd_str = SystemTools::GetFilenamePath(pwd_str.c_str());
        cwd_str = SystemTools::GetFilenamePath(cwd_str.c_str());
        Realpath(pwd_str.c_str(), pwd_path);
        }

      // Add the translation to keep the logical path name.
      if(!cwd_changed.empty() && !pwd_changed.empty())
        {
        SystemTools::AddTranslationPath(cwd_changed.c_str(),
                                        pwd_changed.c_str());
        }
      }
    }
#endif
}

void SystemTools::ClassFinalize()
{
  delete SystemTools::TranslationMap;
  delete SystemTools::LongPathMap;
#ifdef __CYGWIN__
  delete SystemTools::Cyg2Win32Map;
#endif
}


} // namespace KWSYS_NAMESPACE

#if defined(_MSC_VER) && defined(_DEBUG)
# include <crtdbg.h>
# include <stdio.h>
# include <stdlib.h>
namespace KWSYS_NAMESPACE
{

static int SystemToolsDebugReport(int, char* message, int*)
{
  fprintf(stderr, "%s", message);
  fflush(stderr);
  return 1; // no further reporting required
}

void SystemTools::EnableMSVCDebugHook()
{
  if (getenv("DART_TEST_FROM_DART"))
    {
    _CrtSetReportHook(SystemToolsDebugReport);
    }
}

} // namespace KWSYS_NAMESPACE
#else
namespace KWSYS_NAMESPACE
{
void SystemTools::EnableMSVCDebugHook() {}
} // namespace KWSYS_NAMESPACE
#endif