~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Mark Atwood

 *

 *  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; version 2 of the License.

 *

 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include <drizzled/server_includes.h>

#include <drizzled/errmsg.h>

#include <drizzled/gettext.h>

static bool errmsg_has= false;

int errmsg_initializer(st_plugin_int *plugin)

{

  errmsg_t *p;

  p= (errmsg_t *) malloc(sizeof(errmsg_t));

  if (p == NULL) return 1;

  memset(p, 0, sizeof(errmsg_t));

  plugin->data= (void *)p;

  if (plugin->plugin->init)

  {

    if (plugin->plugin->init((void *)p))

    {

      /* we're doing the errmsg plugin api,

	 so we can't trust the errmsg api to emit our error messages

	 so we will emit error messages to stderr */

      /* TRANSLATORS: The leading word "errmsg" is the name

         of the plugin api, and so should not be translated. */

      fprintf(stderr,

	      _("errmsg plugin '%s' init() failed."),

	      plugin->name.str);

      goto err;

    }

  }

  errmsg_has= true;

  return 0;

err:

  free(p);

  return 1;

}

int errmsg_finalizer(st_plugin_int *plugin)

{ 

  errmsg_t *p = (errmsg_t *) plugin->data;

  if (plugin->plugin->deinit)

  {

    if (plugin->plugin->deinit((void *)p))

    {

      /* we're doing the errmsg plugin api,

	 so we can't trust the errmsg api to emit our error messages

	 so we will emit error messages to stderr */

      /* TRANSLATORS: The leading word "errmsg" is the name

         of the plugin api, and so should not be translated. */

      fprintf(stderr,

	      _("errmsg plugin '%s' deinit() failed."),

	      plugin->name.str);

    }

  }

  if (p) free(p);

  return 0;

}

/* The plugin_foreach() iterator requires that we

   convert all the parameters of a plugin api entry point

   into just one single void ptr, plus the session.

   So we will take all the additional paramters of errmsg_vprintf,

   and marshall them into a struct of this type, and

   then just pass in a pointer to it.

*/

typedef struct errmsg_parms_st

{

  int priority;

  const char *format;

  va_list ap;

} errmsg_parms_t;

/* This gets called by plugin_foreach once for each loaded errmsg plugin */

static bool errmsg_iterate (Session *session, plugin_ref plugin, void *p)

{

  errmsg_t *l= plugin_data(plugin, errmsg_t *);

  errmsg_parms_t *parms= (errmsg_parms_t *) p;

  if (l && l->errmsg_func)

  {

    if (l->errmsg_func(session, parms->priority, parms->format, parms->ap))

    {

      /* we're doing the errmsg plugin api,

	 so we can't trust the errmsg api to emit our error messages

	 so we will emit error messages to stderr */

      /* TRANSLATORS: The leading word "errmsg" is the name

         of the plugin api, and so should not be translated. */

      fprintf(stderr,

	      _("errmsg plugin '%s' errmsg_func() failed"),

	      (char *)plugin_name(plugin));

      return true;

    }

  }

  return false;

}

bool errmsg_vprintf (Session *session, int priority, const char *format, va_list ap)

{

  bool foreach_rv;

  errmsg_parms_t parms;

  /* check to see if any errmsg plugin has been loaded

     if not, just fall back to emitting the message to stderr */

  if (!errmsg_has)

  {

    /* if it turns out that the vfprintf doesnt do one single write

       (single writes are atomic), then this needs to be rewritten to

       vsprintf into a char buffer, and then write() that char buffer

       to stderr */

    vfprintf(stderr, format, ap);

    return false;

  }

  /* marshall the parameters so they will fit into the foreach */

  parms.priority= priority;

  parms.format= format;

  va_copy(parms.ap, ap);

  /* call errmsg_iterate

     once for each loaded errmsg plugin */

  foreach_rv= plugin_foreach(session,

			     errmsg_iterate,

			     DRIZZLE_ERRMSG_PLUGIN,

			     (void *) &parms);

  return foreach_rv;

}

bool errmsg_printf (Session *session, int priority, const char *format, ...)

{

  bool rv;

  va_list args;

  va_start(args, format);

  rv= errmsg_vprintf(session, priority, format, args);

  va_end(args);

  return rv;

}