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/* Handle CLASSPATH, -classpath, and path searching.

   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006,

   2007, 2008 Free Software Foundation, Inc.

This file is part of GCC.

GCC 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 3, or (at your option)

any later version.

GCC 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 GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.

Java and all Java-based marks are trademarks or registered trademarks

of Sun Microsystems, Inc. in the United States and other countries.

The Free Software Foundation is independent of Sun Microsystems, Inc.  */

/* Written by Tom Tromey <tromey@cygnus.com>, October 1998.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#include <dirent.h>

#include "jcf.h"

#ifndef DIR_UP

#define DIR_UP ".."

#endif

/* Possible flag values.  */

#define FLAG_SYSTEM 1

#define FLAG_ZIP    2

/* We keep linked lists of directory names.  A ``directory'' can be

   either an ordinary directory or a .zip file.  */

struct entry

{

  char *name;

  int flags;

  struct entry *next;

};

static void free_entry (struct entry **);

static void append_entry (struct entry **, struct entry *);

static void add_entry (struct entry **, const char *, int);

static void add_path (struct entry **, const char *, int);

/* We support several different ways to set the class path.

   built-in system directory (only libgcj.jar)

   CLASSPATH environment variable

   -classpath option overrides $CLASSPATH

   -CLASSPATH option is a synonym for -classpath (for compatibility)

   -bootclasspath overrides built-in

   -extdirs sets the extensions directory path (overrides built-in)

   -I prepends path to list

   We implement this by keeping several path lists, and then simply

   ignoring the ones which are not relevant.  */

/* This holds all the -I directories.  */

static struct entry *include_dirs;

/* This holds the CLASSPATH environment variable.  */

static struct entry *classpath_env;

/* This holds the -classpath command-line option.  */

static struct entry *classpath_user;

/* This holds the default directories.  Some of these will have the

   "system" flag set.  */

static struct entry *sys_dirs;

/* This holds the extensions path entries.  */

static struct entry *extensions;

/* This is the sealed list.  It is just a combination of other lists.  */

static struct entry *sealed;

/* We keep track of the longest path we've seen.  */

static int longest_path = 0;

static void

free_entry (struct entry **entp)

{

  struct entry *e, *n;

  for (e = *entp; e; e = n)

    {

      n = e->next;

      free (e->name);

      free (e);

    }

  *entp = NULL;

}

static void

append_entry (struct entry **entp, struct entry *ent)

{

  /* It doesn't matter if this is slow, since it is run only at

     startup, and then infrequently.  */

  struct entry *e;

  /* Find end of list.  */

  for (e = *entp; e && e->next; e = e->next)

    ;

  if (e)

    e->next = ent;

  else

    *entp = ent;

}

static void

add_entry (struct entry **entp, const char *filename, int is_system)

{

  int len;

  struct entry *n;

  n = XNEW (struct entry);

  n->flags = is_system ? FLAG_SYSTEM : 0;

  n->next = NULL;

  len = strlen (filename);

  if (len > 4 && (FILENAME_CMP (filename + len - 4, ".zip") == 0

                  || FILENAME_CMP (filename + len - 4, ".jar") == 0))

    {

      n->flags |= FLAG_ZIP;

      /* If the user uses -classpath then he'll have to include

         libgcj.jar in the value.  We check for this in a simplistic

         way.  Symlinks will fool this test.  This is only used for

         -MM and -MMD, so it probably isn't terribly important.  */

      if (! FILENAME_CMP (filename, LIBGCJ_ZIP_FILE))

        n->flags |= FLAG_SYSTEM;

    }

  /* Note that we add a trailing separator to `.zip' names as well.

     This is a little hack that lets the searching code in jcf-io.c

     work more easily.  Eww.  */

  if (! IS_DIR_SEPARATOR (filename[len - 1]))

    {

      char *f2 = (char *) alloca (len + 2);

      strcpy (f2, filename);

      f2[len] = DIR_SEPARATOR;

      f2[len + 1] = '\0';

      n->name = xstrdup (f2);

      ++len;

    }

  else

    n->name = xstrdup (filename);

  if (len > longest_path)

    longest_path = len;

  append_entry (entp, n);

}

static void

add_path (struct entry **entp, const char *cp, int is_system)

{

  const char *startp, *endp;

  if (cp)

    {

      char *buf = (char *) alloca (strlen (cp) + 3);

      startp = endp = cp;

      while (1)

        {

          if (! *endp || *endp == PATH_SEPARATOR)

            {

              if (endp == startp)

                {

                  buf[0] = '.';

                  buf[1] = DIR_SEPARATOR;

                  buf[2] = '\0';

                }

              else

                {

                  strncpy (buf, startp, endp - startp);

                  buf[endp - startp] = '\0';

                }

              add_entry (entp, buf, is_system);

              if (! *endp)

                break;

              ++endp;

              startp = endp;

            }

          else

            ++endp;

        }

    }

}

static int init_done = 0;

/* Initialize the path module.  */

void

jcf_path_init (void)

{

  char *cp;

  char *attempt, sep[2];

  struct stat stat_b;

  int found = 0, len;

  if (init_done)

    return;

  init_done = 1;

  sep[0] = DIR_SEPARATOR;

  sep[1] = '\0';

  GET_ENVIRONMENT (cp, "GCC_EXEC_PREFIX");

  if (cp)

    {

      attempt = (char *) alloca (strlen (cp) + 50);

      /* The exec prefix can be something like

         /usr/local/bin/../lib/gcc-lib/.  We want to change this

         into a pointer to the share/java directory.  We support two

         configurations: one where prefix and exec-prefix are the

         same, and one where exec-prefix is `prefix/SOMETHING'.  */

      strcpy (attempt, cp);

      strcat (attempt, DIR_UP);

      strcat (attempt, sep);

      strcat (attempt, DIR_UP);

      strcat (attempt, sep);

      len = strlen (attempt);

      strcpy (attempt + len, "share");

      strcat (attempt, sep);

      strcat (attempt, "java");

      strcat (attempt, sep);

      strcat (attempt, "libgcj-" DEFAULT_TARGET_VERSION ".jar");

      if (! stat (attempt, &stat_b))

        {

          add_entry (&sys_dirs, attempt, 1);

          found = 1;

          strcpy (&attempt[strlen (attempt)

                           - strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],

                  sep);

          strcat (attempt, "ext");

          strcat (attempt, sep);

          if (! stat (attempt, &stat_b))

            jcf_path_extdirs_arg (attempt);

        }

      else

        {

          strcpy (attempt + len, DIR_UP);

          strcat (attempt, sep);

          strcat (attempt, "share");

          strcat (attempt, sep);

          strcat (attempt, "java");

          strcat (attempt, sep);

          strcat (attempt, "libgcj-" DEFAULT_TARGET_VERSION ".jar");

          if (! stat (attempt, &stat_b))

            {

              add_entry (&sys_dirs, attempt, 1);

              found = 1;

              strcpy (&attempt[strlen (attempt)

                               - strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],

                      sep);

              strcat (attempt, "ext");

              strcat (attempt, sep);

              if (! stat (attempt, &stat_b))

                jcf_path_extdirs_arg (attempt);

            }

        }

    }

  if (! found)

    {

      /* Desperation: use the installed one.  */

      char *extdirs;

      add_entry (&sys_dirs, LIBGCJ_ZIP_FILE, 1);

      extdirs = (char *) alloca (strlen (LIBGCJ_ZIP_FILE) + 1);

      strcpy (extdirs, LIBGCJ_ZIP_FILE);

      strcpy (&extdirs[strlen (LIBGCJ_ZIP_FILE)

                      - strlen ("libgcj-" DEFAULT_TARGET_VERSION ".jar")],

              "ext");

      strcat (extdirs, sep);

      if (! stat (extdirs, &stat_b))

        jcf_path_extdirs_arg (extdirs);

    }

  GET_ENVIRONMENT (cp, "CLASSPATH");

  add_path (&classpath_env, cp, 0);

}

/* Call this when -classpath is seen on the command line.

   This overrides only the $CLASSPATH environment variable.

 */

void

jcf_path_classpath_arg (const char *path)

{

  free_entry (&classpath_user);

  add_path (&classpath_user, path, 0);

}

/* Call this when -bootclasspath is seen on the command line.

 */

void

jcf_path_bootclasspath_arg (const char *path)

{

  free_entry (&sys_dirs);

  add_path (&sys_dirs, path, 1);

}

/* Call this when -extdirs is seen on the command line.

 */

void

jcf_path_extdirs_arg (const char *cp)

{

  const char *startp, *endp;

  free_entry (&extensions);

  if (cp)

    {

      char *buf = (char *) alloca (strlen (cp) + 3);

      startp = endp = cp;

      while (1)

        {

          if (! *endp || *endp == PATH_SEPARATOR)

            {

              if (endp == startp)

                return;

              strncpy (buf, startp, endp - startp);

              buf[endp - startp] = '\0';

              {

                DIR *dirp = NULL;

                int dirname_length = strlen (buf);

                dirp = opendir (buf);

                if (dirp == NULL)

                  return;

                for (;;)

                  {

                    struct dirent *direntp = readdir (dirp);

                    if (!direntp)

                      break;

                    if (direntp->d_name[0] != '.')

                      {

                        char *name = (char *) alloca (dirname_length

                                             + strlen (direntp->d_name) + 2);

                        strcpy (name, buf);

                        if (! IS_DIR_SEPARATOR (name[dirname_length-1]))

                          {

                            name[dirname_length] = DIR_SEPARATOR;

                            name[dirname_length+1] = 0;

                          }

                        strcat (name, direntp->d_name);

                        add_entry (&extensions, name, 0);

                      }

                  }

                if (dirp)

                  closedir (dirp);

              }

              if (! *endp)

                break;

              ++endp;

              startp = endp;

            }

          else

            ++endp;

        }

    }

}

/* Call this when -I is seen on the command line.  */

void

jcf_path_include_arg (const char *path)

{

  add_entry (&include_dirs, path, 0);

}

/* We `seal' the path by linking everything into one big list.  Then

   we provide a way to iterate through the sealed list.  If PRINT is

   true then we print the final class path to stderr.  */

void

jcf_path_seal (int print)

{

  struct entry *secondary;

  sealed = include_dirs;

  include_dirs = NULL;

  if (classpath_user)

    {

      secondary = classpath_user;

      classpath_user = NULL;

    }

  else

    {

      if (! classpath_env)

        add_entry (&classpath_env, ".", 0);

      secondary = classpath_env;

      classpath_env = NULL;

    }

  free_entry (&classpath_user);

  free_entry (&classpath_env);

  append_entry (&sealed, secondary);

  append_entry (&sealed, sys_dirs);

  append_entry (&sealed, extensions);

  sys_dirs = NULL;

  extensions = NULL;

  if (print)

    {

      struct entry *ent;

      fprintf (stderr, "Class path starts here:\n");

      for (ent = sealed; ent; ent = ent->next)

        {

          fprintf (stderr, "    %s", ent->name);

          if ((ent->flags & FLAG_SYSTEM))

            fprintf (stderr, " (system)");

          if ((ent->flags & FLAG_ZIP))

            fprintf (stderr, " (zip)");

          fprintf (stderr, "\n");

        }

    }

}

void *

jcf_path_start (void)

{

  return (void *) sealed;

}

void *

jcf_path_next (void *x)

{

  struct entry *ent = (struct entry *) x;

  return (void *) ent->next;

}

static const char

PATH_SEPARATOR_STR[] = {PATH_SEPARATOR, '\0'};

char *

jcf_path_compute (const char *prefix)

{

  struct entry *iter;

  char *result;

  int length = strlen (prefix) + 1;

  int first;

  for (iter = sealed; iter != NULL; iter = iter->next)

    length += strlen (iter->name) + 1;

  result = (char *) xmalloc (length);

  strcpy (result, prefix);

  first = 1;

  for (iter = sealed; iter != NULL; iter = iter->next)

    {

      if (! first)

        strcat (result, PATH_SEPARATOR_STR);

      first = 0;

      strcat (result, iter->name);

      /* Ugly: we want to strip the '/' from zip entries when

         computing a string classpath.  */

      if ((iter->flags & FLAG_ZIP) != 0)

        result[strlen (result) - 1] = '\0';

    }

  return result;

}

/* We guarantee that the return path will either be a zip file, or it

   will end with a directory separator.  */

char *

jcf_path_name (void *x)

{

  struct entry *ent = (struct entry *) x;

  return ent->name;

}

int

jcf_path_is_zipfile (void *x)

{

  struct entry *ent = (struct entry *) x;

  return (ent->flags & FLAG_ZIP);

}

int

jcf_path_is_system (void *x)

{

  struct entry *ent = (struct entry *) x;

  return (ent->flags & FLAG_SYSTEM);

}

int

jcf_path_max_len (void)

{

  return longest_path;

}