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[bug-gnulib] Re: new modules for Java interoperability


From: Bruno Haible
Subject: [bug-gnulib] Re: new modules for Java interoperability
Date: Wed, 19 Jan 2005 15:00:23 +0100
User-agent: KMail/1.5

OK, I committed the sh-quote module. The next one is the module for
changing CLASSPATH. It is needed because some JVMs, such that gij, don't
allow to pass the classpath as a command-line option. It is a module of its
own because both javaexec and javacomp need it.


=========================== modules/classpath ===========================
Description:
Java CLASSPATH handling.

Files:
lib/classpath.h
lib/classpath.c

Depends-on:
stdbool
xsetenv
xalloc

configure.ac:

Makefile.am:
lib_SOURCES += classpath.h classpath.c

Include:
"classpath.h"

License:
GPL

Maintainer:
Bruno Haible

============================== lib/classpath.h ==============================
/* Java CLASSPATH handling.
   Copyright (C) 2003 Free Software Foundation, Inc.
   Written by Bruno Haible <address@hidden>, 2003.

   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.  */

#include <stdbool.h>

/* Return the new CLASSPATH value.  The given classpaths are prepended to
   the current CLASSPATH value.   If use_minimal_classpath, the current
   CLASSPATH is ignored.  */
extern char * new_classpath (const char * const *classpaths,
                             unsigned int classpaths_count,
                             bool use_minimal_classpath);

/* Set CLASSPATH and returns a safe copy of its old value.  */
extern char * set_classpath (const char * const *classpaths,
                             unsigned int classpaths_count,
                             bool use_minimal_classpath, bool verbose);

/* Restore CLASSPATH to its previous value.  */
extern void reset_classpath (char *old_classpath);
============================== lib/classpath.c ==============================
/* Java CLASSPATH handling.
   Copyright (C) 2001-2003 Free Software Foundation, Inc.
   Written by Bruno Haible <address@hidden>, 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);
}





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