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/* Transliteration using the locale's data.

   Copyright (C) 2000 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <assert.h>

#include <dlfcn.h>

#include <search.h>

#include <stdint.h>

#include <string.h>

#include <stdlib.h>

#include <dirent.h>

#include <ltdl.h>

#include "gconv_int.h"

#include "localeinfo.h"

int

__gconv_transliterate (struct __gconv_step *step,

                       struct __gconv_step_data *step_data,

                       void *trans_data __attribute__ ((unused)),

                       const unsigned char *inbufstart,

                       const unsigned char **inbufp,

                       const unsigned char *inbufend,

                       unsigned char **outbufstart, size_t *irreversible)

{

  return 0;

}

/* Structure to represent results of found (or not) transliteration

   modules.  */

struct known_trans

{

  /* This structure must remain the first member.  */

  struct trans_struct info;

  char *fname;

  void *handle;

  int open_count;

};

/* Tree with results of previous calls to __gconv_translit_find.  */

static void *search_tree;

/* We modify global data.   */

__LOCK_INIT(static, lock);

/* Compare two transliteration entries.  */

static int

trans_compare (const void *p1, const void *p2)

{

  const struct known_trans *s1 = (const struct known_trans *) p1;

  const struct known_trans *s2 = (const struct known_trans *) p2;

  return strcmp (s1->info.name, s2->info.name);

}

/* Open (maybe reopen) the module named in the struct.  Get the function

   and data structure pointers we need.  */

static int

open_translit (struct known_trans *trans)

{

  __gconv_trans_query_fct queryfct;

  trans->handle = __libc_dlopen (trans->fname);

  if (trans->handle == NULL)

    /* Not available.  */

    return 1;

  /* Find the required symbol.  */

  queryfct = __libc_dlsym (trans->handle, "gconv_trans_context");

  if (queryfct == NULL)

    {

      /* We cannot live with that.  */

    close_and_out:

      __libc_dlclose (trans->handle);

      trans->handle = NULL;

      return 1;

    }

  /* Get the context.  */

  if (queryfct (trans->info.name, &trans->info.csnames, &trans->info.ncsnames)

      != 0)

    goto close_and_out;

  /* Of course we also have to have the actual function.  */

  trans->info.trans_fct = __libc_dlsym (trans->handle, "gconv_trans");

  if (trans->info.trans_fct == NULL)

    goto close_and_out;

  /* Now the optional functions.  */

  trans->info.trans_init_fct =

    __libc_dlsym (trans->handle, "gconv_trans_init");

  trans->info.trans_context_fct =

    __libc_dlsym (trans->handle, "gconv_trans_context");

  trans->info.trans_end_fct =

    __libc_dlsym (trans->handle, "gconv_trans_end");

  trans->open_count = 1;

  return 0;

}

int

internal_function

__gconv_translit_find (struct trans_struct *trans)

{

  struct known_trans **found;

  const struct path_elem *runp;

  int res = 1;

  /* We have to have a name.  */

  assert (trans->name != NULL);

  /* Acquire the lock.  */

#ifdef HAVE_DD_LOCK

  __lock_acquire(lock);

#endif

  /* See whether we know this module already.  */

  found = tfind (trans, &search_tree, trans_compare);

  if (found != NULL)

    {

      /* Is this module available?  */

      if ((*found)->handle != NULL)

        {

          /* Maybe we have to reopen the file.  */

          if ((*found)->handle != (void *) -1)

            /* The object is not unloaded.  */

            res = 0;

          else if (open_translit (*found) == 0)

            {

              /* Copy the data.  */

              *trans = (*found)->info;

              (*found)->open_count++;

              res = 0;

            }

        }

    }

  else

    {

      size_t name_len = strlen (trans->name) + 1;

      int need_so = 0;

      struct known_trans *newp;

      /* We have to continue looking for the module.  */

      if (__gconv_path_elem == NULL)

        __gconv_get_path ();

      /* See whether we have to append .so.  */

      if (name_len <= 4 || memcmp (&trans->name[name_len - 4], ".so", 3) != 0)

        need_so = 1;

      /* Create a new entry.  */

      newp = (struct known_trans *) malloc (sizeof (struct known_trans)

                                            + (__gconv_max_path_elem_len

                                               + name_len + 3)

                                            + name_len);

      if (newp != NULL)

        {

          char *cp;

          /* Clear the struct.  */

          memset (newp, '\0', sizeof (struct known_trans));

          /* Store a copy of the module name.  */

          newp->info.name = cp = (char *) (newp + 1);

          cp = memcpy (cp, trans->name, name_len);

          cp += name_len;

          newp->fname = cp;

          /* Search in all the directories.  */

          for (runp = __gconv_path_elem; runp->name != NULL; ++runp)

            {

              strcpy ((char *) newp->fname, runp->name);

              while(newp->fname != '\0') newp->fname++;

              cp = memcpy (newp->fname,

                            trans->name, name_len);

              cp += name_len;

              if (need_so)

                memcpy (cp, ".so", sizeof (".so"));

              if (open_translit (newp) == 0)

                {

                  /* We found a module.  */

                  res = 0;

                  break;

                }

            }

          if (res)

            newp->fname = NULL;

          /* In any case we'll add the entry to our search tree.  */

          if (tsearch (newp, &search_tree, trans_compare) == NULL)

            {

              /* Yickes, this should not happen.  Unload the object.  */

              res = 1;

              /* XXX unload here.  */

            }

        }

    }

#ifdef HAVE_DD_LOCK

  __lock_release(lock);

#endif

  return res;

}