// natSystemProperties.cc - Implementation of native side of
// SystemProperties class.

/* Copyright (C) 2005, 2006  Free Software Foundation

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

#include <config.h>
#include <platform.h>

#include <stdlib.h>
#include <errno.h>

#ifdef HAVE_PWD_H
#include <pwd.h>
#endif

#ifdef HAVE_UNAME
#include <sys/utsname.h>
#endif

#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif

#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif

#include <gcj/cni.h>
#include <jvm.h>
#include <java-props.h>
#include <gnu/classpath/SystemProperties.h>
#include <java/lang/String.h>
#include <jni.h>

char *_Jv_Module_Load_Path = NULL;

#ifdef USE_LTDL
#include <ltdl.h>

void
_Jv_SetDLLSearchPath (const char *path)
{
  _Jv_Module_Load_Path = strdup (path);
}

#else

void
_Jv_SetDLLSearchPath (const char *)
{
  // Nothing.
}

#endif /* USE_LTDL */

#if ! defined (DEFAULT_FILE_ENCODING) && defined (HAVE_ICONV) \
    && defined (HAVE_NL_LANGINFO)

static const char *
file_encoding ()
{
  setlocale (LC_CTYPE, "");
  const char *e = nl_langinfo (CODESET);
  if (e == NULL || *e == '\0')
    e = "8859_1";
  return e;
}

#define DEFAULT_FILE_ENCODING file_encoding ()

#endif

#ifndef DEFAULT_FILE_ENCODING
#define DEFAULT_FILE_ENCODING "8859_1"
#endif

static const char *default_file_encoding = DEFAULT_FILE_ENCODING;

#if defined(HAVE_GETPWUID_R) && defined(_POSIX_PTHREAD_SEMANTICS)
/* Use overload resolution to find out the signature of getpwuid_r.  */

  /* This is Posix getpwuid_r.  */
template <typename T_uid, typename T_passwd, typename T_buf, typename T_len>
static inline int
getpwuid_adaptor(int (*getpwuid_r)(T_uid user_id, T_passwd *pwd_r,
				   T_buf *buf_r, T_len len_r,
				   T_passwd **pwd_entry_ptr),
		 uid_t user_id, struct passwd *pwd_r,
		 char *buf_r, size_t len_r, struct passwd **pwd_entry)
{
  return getpwuid_r (user_id, pwd_r, buf_r, len_r, pwd_entry);
}

/* This is used on HPUX 10.20 */
template <typename T_uid, typename T_passwd, typename T_buf, typename T_len>
static inline int
getpwuid_adaptor(int (*getpwuid_r)(T_uid user_id, T_passwd *pwd_r,
				   T_buf *buf_r, T_len len_r),
		 uid_t user_id, struct passwd *pwd_r,
		 char *buf_r, size_t len_r, struct passwd **pwd_entry)
{
  return getpwuid_r (user_id, pwd_r, buf_r, len_r);
}

/* This is used on IRIX 5.2.  */
template <typename T_uid, typename T_passwd, typename T_buf, typename T_len>
static inline int
getpwuid_adaptor(T_passwd * (*getpwuid_r)(T_uid user_id, T_passwd *pwd_r,
					  T_buf *buf_r, T_len len_r),
		 uid_t user_id, struct passwd *pwd_r,
		 char *buf_r, size_t len_r, struct passwd **pwd_entry)
{
  *pwd_entry = getpwuid_r (user_id, pwd_r, buf_r, len_r);
  return (*pwd_entry == NULL) ? errno : 0;
}
#endif

// Prepend GCJ_VERSIONED_LIBDIR to a module search path stored in a
// Java string, if the path is not already prefixed by
// GCJ_VERSIONED_LIBDIR.  Return a newly JvMalloc'd char buffer.  The
// result should be freed using JvFree.  See
// _Jv_PrependVersionedLibdir in prims.cc.
static char*
PrependVersionedLibdir (::java::lang::String* libpath)
{
  char* retval = 0;

  // Extract a C char array from libpath.
  char* val = (char*) _Jv_Malloc (JvGetStringUTFLength (libpath) + 1);
  jsize total = JvGetStringUTFRegion (libpath, 0, libpath->length(), val);
  val[total] = '\0';
  retval = _Jv_PrependVersionedLibdir (val);
  JvFree (val);

  return retval;
}

void
gnu::classpath::SystemProperties::insertSystemProperties (java::util::Properties *newprops)
{
  // A convenience define.
#define SET(Prop,Val) \
	newprops->put(JvNewStringLatin1 (Prop), JvNewStringLatin1 (Val))

  // A mixture of the Java Product Versioning Specification
  // (introduced in 1.2), and earlier versioning properties.  Some
  // programs rely on seeing values that they expect, so we claim to
  // be a 1.4-ish VM for their sake.
  SET ("java.version", JV_VERSION);
  SET ("java.runtime.version", JV_VERSION);
  SET ("java.vendor", "Free Software Foundation, Inc.");
  SET ("java.vendor.url", "http://gcc.gnu.org/java/");
  SET ("java.class.version", "48.0");
  SET ("java.vm.specification.version", "1.0");
  SET ("java.vm.specification.name", "Java(tm) Virtual Machine Specification");
  SET ("java.vm.specification.vendor", "Sun Microsystems Inc.");
  SET ("java.vm.version", __VERSION__);
  SET ("java.vm.vendor", "Free Software Foundation, Inc.");
  SET ("java.vm.name", "GNU libgcj");
  SET ("java.specification.version", JV_API_VERSION);
  SET ("java.specification.name", "Java(tm) Platform API Specification");
  SET ("java.specification.vendor", "Sun Microsystems Inc.");

  char value[100];
#define NAME "GNU libgcj "
  strcpy (value, NAME);
  strncpy (value + sizeof (NAME) - 1, __VERSION__,
	   sizeof(value) - sizeof(NAME));
  value[sizeof (value) - 1] = '\0';
  jstring version = JvNewStringLatin1 (value);
  newprops->put (JvNewStringLatin1 ("java.fullversion"), version);
  newprops->put (JvNewStringLatin1 ("java.vm.info"), version);

  // This definition is rather arbitrary: we choose $(prefix).  In
  // part we do this because most people specify only --prefix and
  // nothing else when installing gcj.  Plus, people are free to
  // redefine `java.home' with `-D' if necessary.
  SET ("java.home", JAVA_HOME);
  SET ("gnu.classpath.home", PREFIX);
  // This is set to $(toolexeclibdir) because we use this to find
  // .security files at runtime.
  char val2[sizeof ("file://") + sizeof (TOOLEXECLIBDIR) + 1];
  strcpy (val2, "file://");
  strcat (val2, TOOLEXECLIBDIR);
  SET ("gnu.classpath.home.url", val2);

  SET ("file.encoding", default_file_encoding);

#ifdef HAVE_UNAME
  struct utsname u;
  if (! uname (&u))
    {
      SET ("os.name", u.sysname);
      SET ("os.version", u.release);

      // Normalize x86 architecture names to "i386" (except on Windows, which 
      // is handled in win32.cc).
      if (u.machine[0] == 'i'
	  && u.machine[1] != 0
	  && u.machine[2] == '8'
	  && u.machine[3] == '6'
	  && u.machine[4] == 0)
	SET ("os.arch", "i386");
      else
	SET ("os.arch", u.machine);
    }
  else
    {
      SET ("os.name", "unknown");
      SET ("os.arch", "unknown");
      SET ("os.version", "unknown");
    }
#endif /* HAVE_UNAME */

#ifndef NO_GETUID
#ifdef HAVE_PWD_H
  uid_t user_id = getuid ();
  struct passwd *pwd_entry;

#if defined(HAVE_GETPWUID_R) && defined(_POSIX_PTHREAD_SEMANTICS)
  struct passwd pwd_r;
  size_t len_r = 200;
  char *buf_r = (char *) _Jv_AllocBytes (len_r);

  while (buf_r != NULL)
    {
      int r = getpwuid_adaptor (getpwuid_r, user_id, &pwd_r,
				buf_r, len_r, &pwd_entry);
      if (r == 0)
	break;
      else if (r != ERANGE)
	{
	  pwd_entry = NULL;
	  break;
	}
      len_r *= 2;
      buf_r = (char *) _Jv_AllocBytes (len_r);
    }
#else
  pwd_entry = getpwuid (user_id);
#endif /* HAVE_GETPWUID_R */

  if (pwd_entry != NULL)
    {
      SET ("user.name", pwd_entry->pw_name);
      SET ("user.home", pwd_entry->pw_dir);
      SET ("gnu.gcj.user.realname", pwd_entry->pw_gecos);
    }
#endif /* HAVE_PWD_H */
#endif /* NO_GETUID */

#ifdef HAVE_GETCWD
#ifdef HAVE_UNISTD_H
  /* Use getcwd to set "user.dir". */
  int buflen = 250;
  char *buffer = (char *) malloc (buflen);
  while (buffer != NULL)
    {
      if (getcwd (buffer, buflen) != NULL)
	{
	  SET ("user.dir", buffer);
	  break;
	}
      if (errno != ERANGE)
	break;
      buflen = 2 * buflen;
      buffer = (char *) realloc (buffer, buflen);
    }
  if (buffer != NULL)
    free (buffer);
#endif /* HAVE_UNISTD_H */
#endif /* HAVE_GETCWD */

  // Set user locale properties based on setlocale()
#if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
  // We let the user choose the locale.  However, since Java differs
  // from POSIX, we arbitrarily pick LC_MESSAGES as determining the
  // Java locale.  We can't use LC_ALL because it might return a full
  // list of all the settings.  If we don't have LC_MESSAGES then we
  // just default to `en_US'.
  setlocale (LC_ALL, "");
  char *locale = setlocale (LC_MESSAGES, "");
  if (locale && strlen (locale) >= 2)
    {
      char buf[3];
      buf[2] = '\0';
      // copy the first two chars to user.language
      strncpy (buf, locale, 2);
      SET ("user.language", buf);
      // if the next char is a '_', copy the two after that to user.region
      locale += 2;
      if (locale[0] == '_')
        {
	  locale++;
	  strncpy (buf, locale, 2);
	  SET ("user.region", buf);
        }
    }
  else
#endif /* HAVE_SETLOCALE and HAVE_LC_MESSAGES */
    {
      SET ("user.language", "en");
      SET ("user.region", "US");
    }  

  // Set the java extension directories property if it has not yet been
  // specified.
  ::java::lang::String *extdirs = newprops->getProperty(JvNewStringLatin1("java.ext.dirs"));
  if (! extdirs)
    SET ("java.ext.dirs", JAVA_EXT_DIRS);

  // The endorsed directories that libgcj knows about by default.
  // This is a way to get other jars into the boot class loader
  // without overriding java.endorsed.dirs.
  SET ("gnu.gcj.runtime.endorsed.dirs", GCJ_ENDORSED_DIRS);

  // The path to libgcj's boot classes
  SET ("sun.boot.class.path", BOOT_CLASS_PATH);

  // If there is a default system database, set it.
  SET ("gnu.gcj.precompiled.db.path", LIBGCJ_DEFAULT_DATABASE);

  // Set some properties according to whatever was compiled in with
  // `-D'.  Important: after this point, the only properties that
  // should be set are those which either the user cannot meaningfully
  // override, or which augment whatever value the user has provided.
  for (int i = 0; i < _Jv_Properties_Count; ++i)
    {
      const char *s, *p;
      // Find the `='.
      for (s = p = _Jv_Compiler_Properties[i]; *s && *s != '='; ++s)
	;
      jstring name = JvNewStringLatin1 (p, s - p);
      jstring val = JvNewStringLatin1 (*s == '=' ? s + 1 : s);
      newprops->put (name, val);
    }

  // Set the system properties from the user's environment.
#ifndef DISABLE_GETENV_PROPERTIES
  if (_Jv_Environment_Properties)
    {
      size_t i = 0;

      while (_Jv_Environment_Properties[i].key)
	{
	  SET (_Jv_Environment_Properties[i].key, 
	       _Jv_Environment_Properties[i].value);
	  i++;
	}
    }
#endif

  // The name used to invoke this process (argv[0] in C).
  SET ("gnu.gcj.progname", _Jv_GetSafeArg (0));

  // Allow platform specific settings and overrides.
  _Jv_platform_initProperties (newprops);

  // If java.library.path is set, tell libltdl so we search the new
  // directories as well.
  ::java::lang::String *path = newprops->getProperty(JvNewStringLatin1("java.library.path"));
  if (path)
    {
      // Prepend GCJ_VERSIONED_LIBDIR to the module load path so that
      // libgcj will find its own JNI libraries, like libgtkpeer.so.
      char* val = PrependVersionedLibdir (path);
      _Jv_SetDLLSearchPath (val);
      _Jv_Free (val);
    }
  else
    {
      // Set a value for user code to see.
#ifdef USE_LTDL
      char *libpath = getenv (LTDL_SHLIBPATH_VAR);
      char* val = _Jv_PrependVersionedLibdir (libpath);
      SET ("java.library.path", val);
      _Jv_SetDLLSearchPath (val);
      _Jv_Free (val);
#else
      SET ("java.library.path", "");
#endif
    }

  // If java.class.path is still not set then set it according to the
  // CLASSPATH environment variable if given.  See gij.cc main () and
  // prims.cc _Jv_CreateJavaVM () for all the ways this could have
  // been set much earlier.
  // If CLASSPATH isn't set or if the path is empty fall back to "."
  path = newprops->getProperty(JvNewStringLatin1("java.class.path"));
  if (!path)
    {
      char *classpath = getenv("CLASSPATH");
      if (classpath && classpath[0] != 0)
	{
	  path = JvNewStringLatin1 (classpath);
	  newprops->put(JvNewStringLatin1 ("java.class.path"), path);
	}
    }

  if (!path || path->length() == 0)
    SET ("java.class.path", ".");
}

jboolean
gnu::classpath::SystemProperties::isWordsBigEndian (void)
{
  union
  {
    long lval;
    char cval;
  } u;

  u.lval = 1;
  return u.cval == 0;
}