Logo Search packages:      
Sourcecode: glibc version File versions

gconv_open.c

/* 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 "../locale/localeinfo.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;

  /* 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.  */
        tok = strdupa (errhand);

        tok = __strtok_r (tok, ",", &ptr);
        while (tok != NULL)
          {
            if (__strcasecmp_l (tok, "TRANSLIT", &_nl_C_locobj) == 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_l (tok, "IGNORE", &_nl_C_locobj) == 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_l (tok, runp->name,
                                 &_nl_C_locobj) == 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);
    }

  /* If the string is empty define this to mean the charset of the
     currently selected locale.  */
  if (strcmp (toset, "//") == 0)
    {
      const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET);
      size_t len = strlen (codeset);
      char *dest;
      toset = dest = (char *) alloca (len + 3);
      memcpy (__mempcpy (dest, codeset, len), "//", 3);
    }
  if (strcmp (fromset, "//") == 0)
    {
      const char *codeset = _NL_CURRENT (LC_CTYPE, CODESET);
      size_t len = strlen (codeset);
      char *dest;
      fromset = dest = (char *) alloca (len + 3);
      memcpy (__mempcpy (dest, codeset, len), "//", 3);
    }

  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.  */
          (lastp == NULL ? trans : 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_l (steps[cnt].__from_name,
                              runp->csnames[n], &_nl_C_locobj) == 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;
  return res;
}

Generated by  Doxygen 1.6.0   Back to index