// natFile.cc - Native part of File class.

/* Copyright (C) 1998, 1999  Cygnus Solutions

   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 <errno.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#ifdef HAVE_DIRENT_H
#define _POSIX_PTHREAD_SEMANTICS
#ifndef _REENTRANT
#  define _REENTRANT
#endif
#include <dirent.h>
#endif
#include <string.h>

#include <cni.h>
#include <jvm.h>
#include <java/io/File.h>
#include <java/io/IOException.h>
#include <java/util/Vector.h>
#include <java/lang/String.h>
#include <java/io/FilenameFilter.h>
#include <java/lang/System.h>

jboolean
java::io::File::access (jstring canon, jint query)
{
  if (! canon)
    return false;
  char buf[MAXPATHLEN];
  jsize total = JvGetStringUTFRegion (canon, 0, canon->length(), buf);
  // FIXME?
  buf[total] = '\0';
  JvAssert (query == READ || query == WRITE || query == EXISTS);
#ifdef HAVE_ACCESS
  int mode;
  if (query == READ)
    mode = R_OK;
  else if (query == WRITE)
    mode = W_OK;
  else
    mode = F_OK;
  return ::access (buf, mode) == 0;
#else
  return false;
#endif
}

jboolean
java::io::File::stat (jstring canon, jint query)
{
  if (! canon)
    return false;
  char buf[MAXPATHLEN];
  jsize total = JvGetStringUTFRegion (canon, 0, canon->length(), buf);
  // FIXME?
  buf[total] = '\0';

#ifdef HAVE_STAT
  struct stat sb;
  if (::stat (buf, &sb))
    return false;
  
  JvAssert (query == DIRECTORY || query == ISFILE);
  jboolean r = S_ISDIR (sb.st_mode);
  return query == DIRECTORY ? r : ! r;
#else
  return false;
#endif
}

jlong
java::io::File::attr (jstring canon, jint query)
{
  if (! canon)
    return false;

  char buf[MAXPATHLEN];
  jsize total = JvGetStringUTFRegion (canon, 0, canon->length(), buf);
  // FIXME?
  buf[total] = '\0';

#ifdef HAVE_STAT
  struct stat sb;
  // FIXME: not sure about return value here.
  if (::stat (buf, &sb))
    return 0;

  JvAssert (query == MODIFIED || query == LENGTH);
  // FIXME: time computation is very POSIX-specific -- POSIX and Java
  // have the same Epoch.
  return query == MODIFIED ? sb.st_mtime * 1000 : sb.st_size;
#else
  // There's no good choice here.
  return 23;
#endif
}

jstring
java::io::File::getCanonicalPath (void)
{
  char buf[MAXPATHLEN], buf2[MAXPATHLEN];
  jsize total = JvGetStringUTFRegion (path, 0, path->length(), buf);
  // FIXME?
  buf[total] = '\0';

#ifdef HAVE_REALPATH
  if (realpath (buf, buf2) == NULL)
    _Jv_Throw (new IOException (JvNewStringLatin1 (strerror (errno))));

  // FIXME: what encoding to assume for file names?  This affects many
  // calls.
  return JvNewStringUTF (buf2);
#else
  return JvNewStringUTF (buf);
#endif
}

jboolean
java::io::File::isAbsolute (void)
{
  // FIXME: cpp define name.
  // FIXME: cygwin.
#ifdef WIN32
  if (path->charAt(0) == '/' || path->charAt(0) == '\\')
    return true;
  if (path->length() < 3)
    return false;
  // Hard-code A-Za-z because Windows (I think) can't use non-ASCII
  // letters as drive names.
  if ((path->charAt(0) < 'a' || path->charAt(0) > 'z')
      && (path->charAt(0) < 'A' || path->charAt(0) > 'Z'))
    return false;
  return (path->charAt(1) == ':'
	  && (path->charAt(2) == '/' || path->charAt(2) == '\\'));
#else
  return path->charAt(0) == '/';
#endif
}

#ifdef HAVE_DIRENT_H
#if defined(__JV_POSIX_THREADS__) && defined(HAVE_READDIR_R)

static struct dirent *
get_entry (DIR *dir, struct dirent *e)
{
  struct dirent *r;
  if (readdir_r (dir, e, &r) || r == NULL)
    return NULL;
  return e;
}

#else /* defined(__JV_POSIX_THREADS__) && defined(HAVE_READDIR_R) */

static struct dirent *
get_entry (DIR *dir, struct dirent *)
{
  return readdir (dir);
}

#endif /* defined(__JV_POSIX_THREADS__) && defined(HAVE_READDIR_R) */
#endif /* HAVE_DIRENT_H */

jstringArray
java::io::File::performList (jstring canon, FilenameFilter *filter)
{
  if (! canon)
    return NULL;

#ifdef HAVE_DIRENT_H
  char buf[MAXPATHLEN];
  jsize total = JvGetStringUTFRegion (canon, 0, canon->length(), buf);
  // FIXME?
  buf[total] = '\0';

  DIR *dir = opendir (buf);
  if (! dir)
    return NULL;

  java::util::Vector *vec = new java::util::Vector ();
  struct dirent *d, d2;
  while ((d = get_entry (dir, &d2)) != NULL)
    {
      if (! strcmp (d->d_name, ".") || ! strcmp (d->d_name, ".."))
	continue;

      jstring name = JvNewStringUTF (d->d_name);
      if (filter && ! filter->accept(this, name))
	continue;

      vec->addElement(name);
    }

  closedir (dir);

  jobjectArray ret = JvNewObjectArray (vec->size(), canon->getClass(),
				       NULL);
  vec->copyInto(ret);
  return reinterpret_cast<jstringArray> (ret);
#else /* HAVE_DIRENT_H */
  return NULL;
#endif /* HAVE_DIRENT_H */
}

jboolean
java::io::File::performMkdir (void)
{
  char buf[MAXPATHLEN];
  jsize total = JvGetStringUTFRegion (path, 0, path->length(), buf);
  // FIXME?
  buf[total] = '\0';

#ifdef HAVE_MKDIR
  // FIXME: mode.
  return ::mkdir (buf, 0755) == 0;
#else
  return false;
#endif
}

jboolean
java::io::File::performRenameTo (File *dest)
{
  char buf[MAXPATHLEN];
  jsize total = JvGetStringUTFRegion (path, 0, path->length(), buf);
  // FIXME?
  buf[total] = '\0';
  char buf2[MAXPATHLEN];
  total = JvGetStringUTFRegion (dest->path, 0, dest->path->length(), buf2);
  // FIXME?
  buf2[total] = '\0';

#ifdef HAVE_RENAME
  return ::rename (buf, buf2) == 0;
#else
  return false;
#endif
}

jboolean
java::io::File::performDelete (jstring canon)
{
  char buf[MAXPATHLEN];
  jsize total = JvGetStringUTFRegion (canon, 0, canon->length(), buf);
  // FIXME?
  buf[total] = '\0';

#ifdef HAVE_UNLINK
#ifdef HAVE_RMDIR
  if (! ::rmdir (buf))
    return true;
#endif // HAVE_RMDIR
  if (errno == ENOTDIR)
    return ::unlink (buf) == 0;
#endif // HAVE_UNLINK
  return false;
}