new file mode 100644
--- /dev/null
+++ b/lib/classpath.c
@@ -0,0 +1,125 @@
+/* Java CLASSPATH handling.
+   Copyright (C) 2001-2003 Free Software Foundation, Inc.
+   Written by Bruno Haible <haible@clisp.cons.org>, 2001.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* Specification.  */
+#include "classpath.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "xsetenv.h"
+#include "xalloc.h"
+
+/* Name of environment variable.  */
+#ifndef CLASSPATHVAR
+# define CLASSPATHVAR "CLASSPATH"
+#endif
+
+/* Separator in PATH like lists of pathnames.  */
+#if defined _WIN32 || defined __WIN32__ || defined __EMX__ || defined __DJGPP__
+  /* Win32, OS/2, DOS */
+# define PATH_SEPARATOR ';'
+#else
+  /* Unix */
+# define PATH_SEPARATOR ':' 
+#endif
+
+/* Return the new CLASSPATH value.  The given classpaths are prepended to
+   the current CLASSPATH value.   If use_minimal_classpath, the current
+   CLASSPATH is ignored.  */
+char *
+new_classpath (const char * const *classpaths, unsigned int classpaths_count,
+	       bool use_minimal_classpath)
+{
+  const char *old_classpath;
+  unsigned int length;
+  unsigned int i;
+  char *result;
+  char *p;
+
+  old_classpath = (use_minimal_classpath ? NULL : getenv (CLASSPATHVAR));
+  if (old_classpath == NULL)
+    old_classpath = "";
+
+  length = 0;
+  for (i = 0; i < classpaths_count; i++)
+    length += strlen (classpaths[i]) + 1;
+  length += strlen (old_classpath);
+  if (classpaths_count > 0 && old_classpath[0] == '\0')
+    length--;
+
+  result = (char *) xmalloc (length + 1);
+  p = result;
+  for (i = 0; i < classpaths_count; i++)
+    {
+      memcpy (p, classpaths[i], strlen (classpaths[i]));
+      p += strlen (classpaths[i]);
+      *p++ = PATH_SEPARATOR;
+    }
+  if (old_classpath[0] != '\0')
+    {
+      memcpy (p, old_classpath, strlen (old_classpath));
+      p += strlen (old_classpath);
+    }
+  else
+    {
+      if (classpaths_count > 0)
+	p--;
+    }
+  *p = '\0';
+
+  return result;
+}
+
+/* Set CLASSPATH and returns a safe copy of its old value.  */
+char *
+set_classpath (const char * const *classpaths, unsigned int classpaths_count,
+	       bool use_minimal_classpath, bool verbose)
+{
+  const char *old_CLASSPATH = getenv (CLASSPATHVAR);
+  char *result = (old_CLASSPATH != NULL ? xstrdup (old_CLASSPATH) : NULL);
+  char *new_CLASSPATH =
+    new_classpath (classpaths, classpaths_count, use_minimal_classpath);
+
+  if (verbose)
+    printf (CLASSPATHVAR "=%s ", new_CLASSPATH);
+
+  xsetenv (CLASSPATHVAR, new_CLASSPATH, 1);
+
+  free (new_CLASSPATH);
+
+  return result;
+}
+
+/* Restore CLASSPATH to its previous value.  */
+void
+reset_classpath (char *old_classpath)
+{
+  if (old_classpath != NULL)
+    {
+      xsetenv (CLASSPATHVAR, old_classpath, 1);
+      free (old_classpath);
+    }
+  else
+    unsetenv (CLASSPATHVAR);
+}