1 files changed, 119 insertions, 0 deletions
diff --git a/src/rc-plugin.c b/src/rc-plugin.c
new file mode 100644
index 00000000..c02b6a81
--- /dev/null
+++ b/src/rc-plugin.c
@@ -0,0 +1,119 @@
+/*
+   librc-plugin.c 
+   Simple plugin handler
+   Copyright 2007 Gentoo Foundation
+   Released under the GPLv2
+   */
+
+#include <dlfcn.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "einfo.h"
+#include "rc.h"
+#include "rc-misc.h"
+#include "rc-plugin.h"
+#include "strlist.h"
+
+typedef struct plugin
+{
+  char *name;
+  void *handle;
+  int (*hook) (rc_hook_t hook, const char *name);
+  struct plugin *next;
+} plugin_t;
+
+static plugin_t *plugins = NULL;
+
+void rc_plugin_load (void)
+{
+  char **files;
+  char *file;
+  int i;
+  plugin_t *plugin = plugins;
+
+  /* Ensure some sanity here */
+  rc_plugin_unload ();
+
+  if (! rc_exists (RC_PLUGINDIR))
+    return;
+
+  files = rc_ls_dir (NULL, RC_PLUGINDIR, 0);
+  STRLIST_FOREACH (files, file, i)
+    {
+      char *p = rc_strcatpaths (RC_PLUGINDIR, file, NULL);
+      void *h = dlopen (p, RTLD_LAZY);
+      char *func;
+      void *f;
+
+      if (! h)
+	{
+	  eerror ("dlopen `%s': %s", p, dlerror ());
+	  free (p);
+	  continue;
+	}
+
+      func = file;
+      file = strsep (&func, ".");
+      func = rc_xmalloc (strlen (file) + strlen ("__hook") + 1);
+      sprintf (func, "_%s_hook", file);
+
+      f = dlsym (h, func);
+      if (! f)
+	{
+	  eerror ("`%s' does not expose the symbol `%s'", p, func);
+	  dlclose (h);
+	}
+      else
+	{
+	  if (plugin)
+	    {
+	      plugin->next = rc_xmalloc (sizeof (plugin_t));
+	      plugin = plugin->next;
+	    }
+	  else
+	    plugin = plugins = rc_xmalloc (sizeof (plugin_t));
+
+	  memset (plugin, 0, sizeof (plugin_t));
+	  plugin->name = strdup (file);
+	  plugin->handle = h;
+	  plugin->hook = f;
+	}
+
+      free (func);
+      free (p);
+    }
+
+  rc_strlist_free (files);
+}
+
+void rc_plugin_run (rc_hook_t hook, const char *value)
+{
+  plugin_t *plugin = plugins;
+
+  while (plugin)
+    {
+      if (plugin->hook)
+	plugin->hook (hook, value);
+
+      plugin = plugin->next;
+    }
+}
+
+void rc_plugin_unload (void)
+{
+  plugin_t *plugin = plugins;
+  plugin_t *next;
+
+  while (plugin)
+    {
+      next = plugin->next;
+      dlclose (plugin->handle);
+      free (plugin->name);
+      free (plugin);
+      plugin = next;
+    }
+  plugins = NULL;
+}