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/* Find matching transformation algorithms and initialize steps.

   Copyright (C) 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   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 <errno.h>

#include <locale.h>

#include <stdlib.h>

#include <string.h>

#include <gconv_int.h>

int

internal_function

__gconv_open (const char *toset, const char *fromset, __gconv_t *handle,

              int flags)

{

  struct __gconv_step *steps;

  size_t nsteps;

  __gconv_t result = NULL;

  size_t cnt = 0;

  int res;

  int conv_flags = 0;

  const char *errhand;

  const char *ignore;

  struct trans_struct *trans = NULL;

  char old_locale[20], *old_locale_p;

  char *old, *new;

  size_t len;

  /* Find out whether any error handling method is specified.  */

  errhand = strchr (toset, '/');

  if (errhand != NULL)

    errhand = strchr (errhand + 1, '/');

  if (__builtin_expect (errhand != NULL, 1))

    {

      if (*++errhand == '\0')

        errhand = NULL;

      else

        {

          /* Make copy without the error handling description.  */

          char *newtoset = (char *) alloca (errhand - toset + 1);

          char *tok;

          char *ptr;

          newtoset[errhand - toset] = '\0';

          toset = memcpy (newtoset, toset, errhand - toset);

          /* Find the appropriate transliteration handlers.  */

          old = (char *)(errhand);

          len = strlen (old) + 1;

          new = (char *) alloca (len);

          tok = (char *) memcpy (new, old, len);

          tok = strtok_r (tok, ",", &ptr);

          /* Set locale to default C locale. */

          old_locale_p = setlocale(LC_ALL, "C");

          strncpy(old_locale, old_locale_p, 20);

          while (tok != NULL)

            {

              if (strcasecmp (tok, "TRANSLIT") == 0)

                {

                  /* It's the builtin transliteration handling.  We only

                     support it for working on the internal encoding.  */

                  static const char *internal_trans_names[1] = { "INTERNAL" };

                  struct trans_struct *lastp = NULL;

                  struct trans_struct *runp;

                  for (runp = trans; runp != NULL; runp = runp->next)

                    if (runp->trans_fct == __gconv_transliterate)

                      break;

                    else

                      lastp = runp;

                  if (runp == NULL)

                    {

                      struct trans_struct *newp;

                      newp = (struct trans_struct *) alloca (sizeof (*newp));

                      memset (newp, '\0', sizeof (*newp));

                      /* We leave the `name' field zero to signal that

                         this is an internal transliteration step.  */

                      newp->csnames = internal_trans_names;

                      newp->ncsnames = 1;

                      newp->trans_fct = __gconv_transliterate;

                      if (lastp == NULL)

                        trans = newp;

                      else

                        lastp->next = newp;

                    }

                }

              else if (strcasecmp (tok, "IGNORE") == 0)

                /* Set the flag to ignore all errors.  */

                conv_flags |= __GCONV_IGNORE_ERRORS;

              else

                {

                  /* `tok' is possibly a module name.  We'll see later

                     whether we can find it.  But first see that we do

                     not already a module of this name.  */

                  struct trans_struct *lastp = NULL;

                  struct trans_struct *runp;

                  for (runp = trans; runp != NULL; runp = runp->next)

                    if (runp->name != NULL

                        && strcasecmp (tok, runp->name) == 0)

                      break;

                    else

                      lastp = runp;

                  if (runp == NULL)

                    {

                      struct trans_struct *newp;

                      newp = (struct trans_struct *) alloca (sizeof (*newp));

                      memset (newp, '\0', sizeof (*newp));

                      newp->name = tok;

                      if (lastp == NULL)

                        trans = newp;

                      else

                        lastp->next = newp;

                    }

                }

              tok = strtok_r (NULL, ",", &ptr);

            }

        }

    }

  /* For the source character set we ignore the error handler specification.

     XXX Is this really always the best?  */

  ignore = strchr (fromset, '/');

  if (ignore != NULL && (ignore = strchr (ignore + 1, '/')) != NULL

      && *++ignore != '\0')

    {

      char *newfromset = (char *) alloca (ignore - fromset + 1);

      newfromset[ignore - fromset] = '\0';

      fromset = memcpy (newfromset, fromset, ignore - fromset);

    }

  res = __gconv_find_transform (toset, fromset, &steps, &nsteps, flags);

  if (res == __GCONV_OK)

    {

      /* Find the modules.  */

      struct trans_struct *lastp = NULL;

      struct trans_struct *runp;

      for (runp = trans; runp != NULL; runp = runp->next)

        {

          if (runp->name == NULL

              || __builtin_expect (__gconv_translit_find (runp), 0) == 0)

            lastp = runp;

          else

            /* This means we haven't found the module.  Remove it.  */

            if (lastp == NULL)

              trans = runp->next;

            else

              lastp->next = runp->next;

        }

      /* Allocate room for handle.  */

      result = (__gconv_t) malloc (sizeof (struct __gconv_info)

                                   + (nsteps

                                      * sizeof (struct __gconv_step_data)));

      if (result == NULL)

        res = __GCONV_NOMEM;

      else

        {

          size_t n;

          /* Remember the list of steps.  */

          result->__steps = steps;

          result->__nsteps = nsteps;

          /* Clear the array for the step data.  */

          memset (result->__data, '\0',

                  nsteps * sizeof (struct __gconv_step_data));

          /* Call all initialization functions for the transformation

             step implementations.  */

          for (cnt = 0; cnt < nsteps; ++cnt)

            {

              size_t size;

              /* Would have to be done if we would not clear the whole

                 array above.  */

#if 0

              /* Reset the counter.  */

              result->__data[cnt].__invocation_counter = 0;

              /* It's a regular use.  */

              result->__data[cnt].__internal_use = 0;

#endif

              /* We use the `mbstate_t' member in DATA.  */

              result->__data[cnt].__statep = &result->__data[cnt].__state;

              /* Now see whether we can use any of the transliteration

                 modules for this step.  */

              for (runp = trans; runp != NULL; runp = runp->next)

                for (n = 0; n < runp->ncsnames; ++n)

                  if (strcasecmp (steps[cnt].__from_name, runp->csnames[n]) == 0)

                    {

                      void *data = NULL;

                      /* Match!  Now try the initializer.  */

                      if (runp->trans_init_fct == NULL

                          || (runp->trans_init_fct (&data,

                                                    steps[cnt].__to_name)

                              == __GCONV_OK))

                        {

                          /* Append at the end of the list.  */

                          struct __gconv_trans_data *newp;

                          struct __gconv_trans_data **lastp;

                          newp = (struct __gconv_trans_data *)

                            malloc (sizeof (struct __gconv_trans_data));

                          if (newp == NULL)

                            {

                              res = __GCONV_NOMEM;

                              goto bail;

                            }

                          newp->__trans_fct = runp->trans_fct;

                          newp->__trans_context_fct = runp->trans_context_fct;

                          newp->__trans_end_fct = runp->trans_end_fct;

                          newp->__data = data;

                          newp->__next = NULL;

                          lastp = &result->__data[cnt].__trans;

                          while (*lastp != NULL)

                            lastp = &(*lastp)->__next;

                          *lastp = newp;

                        }

                      break;

                    }

              /* If this is the last step we must not allocate an

                 output buffer.  */

              if (cnt < nsteps - 1)

                {

                  result->__data[cnt].__flags = conv_flags;

                  /* Allocate the buffer.  */

                  size = (GCONV_NCHAR_GOAL * steps[cnt].__max_needed_to);

                  result->__data[cnt].__outbuf = (char *) malloc (size);

                  if (result->__data[cnt].__outbuf == NULL)

                    {

                      res = __GCONV_NOMEM;

                      goto bail;

                    }

                  result->__data[cnt].__outbufend =

                    result->__data[cnt].__outbuf + size;

                }

              else

                {

                  /* Handle the last entry.  */

                  result->__data[cnt].__flags = conv_flags | __GCONV_IS_LAST;

                  break;

                }

            }

        }

      if (res != __GCONV_OK)

        {

          /* Something went wrong.  Free all the resources.  */

          int serrno;

        bail:

          serrno = errno;

          if (result != NULL)

            {

              while (cnt-- > 0)

                {

                  struct __gconv_trans_data *transp;

                  transp = result->__data[cnt].__trans;

                  while (transp != NULL)

                    {

                      struct __gconv_trans_data *curp = transp;

                      transp = transp->__next;

                      if (__builtin_expect (curp->__trans_end_fct != NULL, 0))

                        curp->__trans_end_fct (curp->__data);

                      free (curp);

                    }

                  free (result->__data[cnt].__outbuf);

                }

              free (result);

              result = NULL;

            }

          __gconv_close_transform (steps, nsteps);

          __set_errno (serrno);

        }

    }

  *handle = result;

  setlocale(LC_ALL, old_locale);

  return res;

}