new file. MH provider registration stuff.

1999-08-12  bertrand  <Bertrand.Guiheneuf@aful.org>

	* camel/providers/MH/camel-mh-provider.c:
	new file. MH provider registration stuff.

	* camel/camel-provider.c (camel_provider_register_as_module):
	load a provider from a shared object (plugin).
	(camel_provider_register): register a provider
	"by hand". Used for statically defined providers.

	* tests/test7.c: new test.
	tests providers loading framework.

Providers modules loading Works !!! :))))

svn path=/trunk/; revision=1105

1 files changed, 100 insertions, 5 deletions

diff --git a/camel/camel-provider.c b/camel/camel-provider.c
index 238b83ce29..0018e262e0 100644
--- a/camel/camel-provider.c
+++ b/camel/camel-provider.c
@@ -1,9 +1,9 @@
 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
-/* camel-provider.c :  provider management */
+/* camel-provider.c :  provider framework   */
 
 /* 
  *
- * Copyright (C) 1999 Bertrand Guiheneuf <Bertrand.Guiheneuf@inria.fr> .
+ * Copyright (C) 1999 Bertrand Guiheneuf <Bertrand.Guiheneuf@aful.org> .
  *
  * This program is free software; you can redistribute it and/or 
  * modify it under the terms of the GNU General Public License as 
@@ -22,8 +22,103 @@
  */
 
 
-
 /* 
+   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 "camel-log.h"
+
+
+static GList *_provider_list = NULL;
+static gchar *_last_error;
+
+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 {
+		_provider_list = g_list_append (_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;
+	
+	CAMEL_LOG_FULL_DEBUG ("Entering CamelProvider::register_as_module\n");
+	
+	g_return_val_if_fail (module_path, NULL);
+
+	if (!g_module_supported ()) {
+		CAMEL_LOG_WARNING ("CamelProvider::register_as_module module loading not supported on this system\n");
+		CAMEL_LOG_FULL_DEBUG ("Leaving CamelProvider::register_as_module\n");
+		return NULL;
+	}
+	
+
+	new_module = g_module_open (module_path, 0);
+	if (!new_module) {
+		CAMEL_LOG_WARNING ("CamelProvider::register_as_module Unable to load module %s\n", module_path);
+		CAMEL_LOG_FULL_DEBUG ("Leaving CamelProvider::register_as_module\n");
+		return NULL;
+	}
+		
+	has_module_init = g_module_symbol (new_module, "camel_provider_module_init", (gpointer *)&camel_provider_module_init);
+	if (!has_module_init){
+		CAMEL_LOG_WARNING ("CamelProvider::register_as_module loading of module %s failed,\n"
+				   "\t Symbol camel_provider_module_init not defined in it\n", module_path);
+		CAMEL_LOG_FULL_DEBUG ("Leaving CamelProvider::register_as_module\n");
+		return NULL;
+	}
+
+	new_provider = camel_provider_module_init();
+	new_provider->gmodule = new_module;
+
+	CAMEL_LOG_FULL_DEBUG ("Leaving CamelProvider::register_as_module\n");
+	return new_provider;
 
-   Here will be the  routine to load providers (plugins)
-   and register them */
+ 
+}