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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-provider.c : provider framework */
/*
*
* Author :
* Bertrand Guiheneuf <bertrand@helixcode.com>
*
* Copyright 1999, 2000 Helix Code, Inc. (http://www.helixcode.com)
*
* 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; either version 2 of the
* License, or (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
/*
A provider can be added "by hand" or by loading a module.
Adding providers with modules.
------------------------------
The modules are shared libraries which must contain the
function
CamelProvider *camel_provider_module_init ();
returning the provider object defined in the module
*/
/* FIXME: Shouldn't we add a version number to providers ? */
#include "config.h"
#include "camel-provider.h"
#include <dirent.h>
#include <string.h>
static GList *_provider_list = NULL;
static gint
_provider_name_cmp (gconstpointer a, gconstpointer b)
{
CamelProvider *provider_a = CAMEL_PROVIDER (a);
CamelProvider *provider_b = CAMEL_PROVIDER (b);
return strcmp ( provider_a->name, provider_b->name);
}
void
camel_provider_register (CamelProvider *provider)
{
GList *old_provider_node = NULL;
g_assert (provider);
if (_provider_list)
old_provider_node = g_list_find_custom (_provider_list, provider, _provider_name_cmp);
if (old_provider_node != NULL) {
/* camel_provider_unref (CAMEL_PROVIDER (old_provider_node->data)); */
old_provider_node->data = provider;
} else {
/* be careful, we use prepend here, so that last registered
providers come first */
_provider_list = g_list_prepend (_provider_list, provider);
}
/* camel_provider_ref (provider); */
}
const CamelProvider *
camel_provider_register_as_module (const gchar *module_path)
{
CamelProvider *new_provider = NULL;
GModule *new_module = NULL;
CamelProvider * (*camel_provider_module_init) ();
gboolean has_module_init;
g_return_val_if_fail (module_path, NULL);
if (!g_module_supported ()) {
g_warning ("CamelProvider::register_as_module: module "
"loading not supported on this system\n");
return NULL;
}
new_module = g_module_open (module_path, 0);
if (!new_module) {
printf ("g_module_open reports: %s\n", g_module_error ());
g_warning ("CamelProvider::register_as_module: Unable to "
"load module %s\n", module_path);
return NULL;
}
has_module_init = g_module_symbol (new_module, "camel_provider_module_init", (gpointer *)&camel_provider_module_init);
if (!has_module_init){
g_warning ("CamelProvider::register_as_module loading "
"of module %s failed,\n\tSymbol "
"camel_provider_module_init not defined in it\n",
module_path);
return NULL;
}
new_provider = camel_provider_module_init();
new_provider->gmodule = new_module;
camel_provider_register (new_provider);
return new_provider;
}
/**
* camel_provider_scan: Scan for available providers and return a list.
*
* Note that this function will cause all providers in the providerdir
* to be loaded into memory.
*
* Return value: the list of CamelProviders. The caller must free this
* list when it is done with it.
**/
GList *
camel_provider_scan (void)
{
DIR *dir;
struct dirent *dent;
char *p, *name;
dir = opendir (CAMEL_PROVIDERDIR);
if (!dir)
return NULL;
while ((dent = readdir (dir))) {
p = strstr (dent->d_name, ".so");
if (!p || strcmp (p, ".so") != 0)
continue;
name = g_module_build_path (CAMEL_PROVIDERDIR, dent->d_name);
camel_provider_register_as_module (name);
g_free (name);
}
closedir (dir);
return g_list_copy (_provider_list);
}
/**
* camel_provider_get_for_protocol: get a registered provider for a protocol
* @protocol: protocol name (case insensitive)
* @type: provider type (transport, store, ...)
*
* Look into the list of registered provider if
* one correspond both to the protocol name
* and to the protocol type. When several providers
* exist for a same protocol, the last registered
* is returned.
*
* Return value: Matching provider or NULL if none exists.
**/
const CamelProvider *
camel_provider_get_for_protocol (const gchar *protocol, ProviderType type)
{
CamelProvider *current_provider = NULL;
GList *current_provider_node;
gboolean protocol_is_found;
gboolean provider_is_found;
g_assert (protocol);
g_return_val_if_fail (_provider_list, NULL);
current_provider_node = _provider_list;
provider_is_found = FALSE;
while ((!provider_is_found) && current_provider_node) {
current_provider = (CamelProvider *)current_provider_node->data;
protocol_is_found = (g_strcasecmp (protocol, current_provider->protocol) == 0);
if (protocol_is_found)
provider_is_found = (current_provider->provider_type == type);
current_provider_node = current_provider_node->next;
}
if (provider_is_found) return current_provider;
else return NULL;
}
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