// natSystem.cc - Native code implementing System class.

/* Copyright (C) 1998, 1999, 2000, 2001  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 <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "posix.h"

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

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

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

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

#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

#include <gcj/cni.h>
#include <jvm.h>
#include <java-props.h>
#include <java/lang/System.h>
#include <java/lang/Class.h>
#include <java/lang/ArrayStoreException.h>
#include <java/lang/ArrayIndexOutOfBoundsException.h>
#include <java/lang/NullPointerException.h>
#include <java/lang/StringBuffer.h>
#include <java/util/Properties.h>
#include <java/util/TimeZone.h>
#include <java/io/PrintStream.h>
#include <java/io/InputStream.h>



void
java::lang::System::setErr (java::io::PrintStream *newErr)
{
  checkSetIO ();
  // This violates `final' semantics.  Oh well.
  err = newErr;
}

void
java::lang::System::setIn (java::io::InputStream *newIn)
{
  checkSetIO ();
  // This violates `final' semantics.  Oh well.
  in = newIn;
}

void
java::lang::System::setOut (java::io::PrintStream *newOut)
{
  checkSetIO ();
  // This violates `final' semantics.  Oh well.
  out = newOut;
}

void
java::lang::System::arraycopy (jobject src, jint src_offset,
			       jobject dst, jint dst_offset,
			       jint count)
{
  if (! src || ! dst)
    throw new NullPointerException;

  jclass src_c = src->getClass();
  jclass dst_c = dst->getClass();
  jclass src_comp = src_c->getComponentType();
  jclass dst_comp = dst_c->getComponentType();

  if (! src_c->isArray() || ! dst_c->isArray()
      || src_comp->isPrimitive() != dst_comp->isPrimitive()
      || (src_comp->isPrimitive() && src_comp != dst_comp))
    throw new ArrayStoreException;

  __JArray *src_a = (__JArray *) src;
  __JArray *dst_a = (__JArray *) dst;
  if (src_offset < 0 || dst_offset < 0 || count < 0
      || src_offset + count > src_a->length
      || dst_offset + count > dst_a->length)
    throw new ArrayIndexOutOfBoundsException;

  // Do-nothing cases.
  if ((src == dst && src_offset == dst_offset)
      || ! count)
    return;

  // If both are primitive, we can optimize trivially.  If DST
  // components are always assignable from SRC components, then we
  // will never need to raise an error, and thus can do the
  // optimization.  If source and destinations are the same, then we
  // know that the assignability premise always holds.
  const bool prim = src_comp->isPrimitive();
  if (prim || dst_comp->isAssignableFrom(src_comp) || src == dst)
    {
      const size_t size = (prim ? src_comp->size()
			   : sizeof elements((jobjectArray)src)[0]);

      char *src_elts = _Jv_GetArrayElementFromElementType (src, src_comp);
      src_elts += size * src_offset;

      char *dst_elts = _Jv_GetArrayElementFromElementType (dst, dst_comp);
      dst_elts += size * dst_offset;

#if HAVE_MEMMOVE
      // We don't bother trying memcpy.  It can't be worth the cost of
      // the check.
      // Don't cast to (void*), as memmove may expect (char*)
      memmove (dst_elts, src_elts, count * size);
#else
      bcopy (src_elts, dst_elts, count * size);
#endif
    }
  else
    {
      jobject *src_elts = elements ((jobjectArray) src_a) + src_offset;
      jobject *dst_elts = elements ((jobjectArray) dst_a) + dst_offset;

      for (int i = 0; i < count; ++i)
	{
	  if (*src_elts
	      && ! dst_comp->isAssignableFrom((*src_elts)->getClass()))
	    throw new ArrayStoreException;
	  *dst_elts++ = *src_elts++;
	}
    }
}

jlong
java::lang::System::currentTimeMillis (void)
{
  struct timeval tv;
  _Jv_gettimeofday (&tv);
  return (jlong) tv.tv_sec * 1000 + tv.tv_usec / 1000;
}

jint
java::lang::System::identityHashCode (jobject obj)
{
  return _Jv_HashCode (obj);
}

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

static char *
file_encoding ()
{
  setlocale (LC_CTYPE, "");
  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 char *default_file_encoding = DEFAULT_FILE_ENCODING;

#if HAVE_GETPWUID_R
/* 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

/*
 * This method returns a time zone string that is used by init_properties
 * to set the default timezone property 'user.timezone'.  That value is
 * used by default as a key into the timezone table used by the
 * java::util::TimeZone class.
 */
jstring
java::lang::System::getSystemTimeZone (void)
{
  struct tm *tim;
  time_t current_time;
  char **tzinfo, *tzid;
  long tzoffset;

  current_time = time(0);

  mktime(tim = localtime(&current_time));
#ifdef STRUCT_TM_HAS_GMTOFF
  // tm_gmtoff is secs EAST of UTC.
  tzoffset = -(tim->tm_gmtoff) + tim->tm_isdst * 3600L;
#elif HAVE_TIMEZONE
  // timezone is secs WEST of UTC.
  tzoffset = timezone;	
#else
  // FIXME: there must be another global if neither tm_gmtoff nor timezone
  // is available, esp. if tzname is valid.
  // Richard Earnshaw <rearnsha@arm.com> has suggested using difftime to
  // calculate between gmtime and localtime (and accounting for possible
  // daylight savings time) as an alternative.  Also note that this same
  // issue exists in java/util/natGregorianCalendar.cc.
  tzoffset = 0L;
#endif
  tzinfo = tzname;

  if ((tzoffset % 3600) == 0)
    tzoffset = tzoffset / 3600;

  if (!strcmp(tzinfo[0], tzinfo[1]))  
    {
      tzid = (char*) _Jv_Malloc (strlen(tzinfo[0]) + 6);
      if (!tzid)
        return NULL;

      sprintf(tzid, "%s%ld", tzinfo[0], tzoffset);
    }
  else
    {
      tzid = (char*) _Jv_Malloc (strlen(tzinfo[0]) + strlen(tzinfo[1]) + 6);
      if (!tzid)
        return NULL;

      sprintf(tzid, "%s%ld%s", tzinfo[0], tzoffset, tzinfo[1]);
    }

  jstring retval = JvNewStringUTF (tzid);
  _Jv_Free (tzid);
  return retval;
}

void
java::lang::System::init_properties (void)
{
  JvSynchronize sync (&java::lang::System::class$);
  
  if (properties != NULL)
    return;

  java::util::Properties* newprops = new java::util::Properties ();
  
  // 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.
  SET ("java.version", VERSION);
  SET ("java.vendor", "Free Software Foundation");
  SET ("java.vendor.url", "http://gcc.gnu.org/java/");
  SET ("java.class.version", GCJVERSION);
  SET ("java.vm.specification.version", "1.1");
  SET ("java.vm.specification.name", "Java(tm) Virtual Machine Specification");
  SET ("java.vm.specification.vendor", "Sun Microsystems Inc.");
  SET ("java.vm.version", GCJVERSION);
  SET ("java.vm.vendor", "Free Software Foundation");
  SET ("java.vm.name", "libgcj");
  SET ("java.specification.version", "1.1");
  SET ("java.specification.name", "Java(tm) Language Specification");
  SET ("java.specification.vendor", "Sun Microsystems Inc.");

  // 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", PREFIX);
  
  SET ("file.encoding", default_file_encoding);

#ifdef WIN32
  SET ("file.separator", "\\");
  SET ("path.separator", ";");
  SET ("line.separator", "\r\n");
  SET ("java.io.tmpdir", "C:\\temp");
#else
  // Unix.
  SET ("file.separator", "/");
  SET ("path.separator", ":");
  SET ("line.separator", "\n");
  char *tmpdir = ::getenv("TMPDIR");
  if (! tmpdir)
    tmpdir = "/tmp";
  SET ("java.io.tmpdir", tmpdir);
#endif

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

#ifdef HAVE_GETPWUID_R
  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);
    }
#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()
#ifdef HAVE_SETLOCALE
  char *locale = setlocale (LC_ALL, "");
  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 */
    {
      SET ("user.language", "en");
    }  

  // Set the "user.timezone" property.
  jstring timezone = getDefaultTimeZoneId ();
  if (timezone != NULL)
    newprops->put (JvNewStringLatin1 ("user.timezone"), timezone);

  // Set some properties according to whatever was compiled in with
  // `-D'.
  for (int i = 0; _Jv_Compiler_Properties[i]; ++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.
  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++;
	}
    }

  if (_Jv_Jar_Class_Path)
    newprops->put(JvNewStringLatin1 ("java.class.path"),
		  JvNewStringLatin1 (_Jv_Jar_Class_Path));
  else
    {
      // FIXME: find libgcj.zip and append its path?
      char *classpath = ::getenv("CLASSPATH");
      jstring cp = newprops->getProperty (JvNewStringLatin1("java.class.path"));
      java::lang::StringBuffer *sb = new java::lang::StringBuffer ();
      
      if (classpath)
	{
	  sb->append (JvNewStringLatin1 (classpath));
#ifdef WIN32
	  sb->append ((jchar) ';');
#else
	  sb->append ((jchar) ':');
#endif
	}
      if (cp != NULL)
	sb->append (cp);
      else
	sb->append ((jchar) '.');
      
      newprops->put(JvNewStringLatin1 ("java.class.path"),
		      sb->toString ());
    }
  // Finally, set the field. This ensures that concurrent getProperty() 
  // calls will return initialized values without requiring them to be 
  // synchronized in the common case.
  properties = newprops;
}