Fix null pointer bug

[projects/chimara/chimara.git] / libchimara / chimara-glk.c

diff --git a/libchimara/chimara-glk.c b/libchimara/chimara-glk.c
index 622117591e2da39be487fbb5e850be8e21713fa5..4d8b55249fd6b3f2136e3daf9e34141481b10bee 100644 (file)
--- a/libchimara/chimara-glk.c
+++ b/libchimara/chimara-glk.c
@@ -11,6 +11,7 @@
 #include <glib/gi18n-lib.h>
 #include <gmodule.h>
 #include <pango/pango.h>
+#include <gio/gio.h>
 #include "chimara-glk.h"
 #include "chimara-glk-private.h"
 #include "chimara-marshallers.h"
@@ -182,6 +183,8 @@ chimara_glk_init(ChimaraGlk *self)
        priv->resource_lock = g_mutex_new();
        priv->resource_loaded = g_cond_new();
        priv->resource_info_available = g_cond_new();
+       priv->resource_load_callback = NULL;
+       priv->resource_load_callback_data = NULL;
        priv->image_cache = NULL;
        priv->program_name = NULL;
        priv->program_info = NULL;
@@ -1060,8 +1063,9 @@ chimara_glk_set_css_from_file(ChimaraGlk *glk, const gchar *filename, GError **e
 
        int fd = open(filename, O_RDONLY);
        if(fd == -1) {
-               *error = g_error_new(G_IO_ERROR, g_io_error_from_errno(errno), 
-                   _("Error opening file \"%s\": %s"), filename, g_strerror(errno));
+               if(error)
+                       *error = g_error_new(G_IO_ERROR, g_io_error_from_errno(errno), 
+                               _("Error opening file \"%s\": %s"), filename, g_strerror(errno));
                return FALSE;
        }
 
@@ -1071,8 +1075,9 @@ chimara_glk_set_css_from_file(ChimaraGlk *glk, const gchar *filename, GError **e
        scan_css_file(scanner, glk);
 
        if(close(fd) == -1) {
-               *error = g_error_new(G_IO_ERROR, g_io_error_from_errno(errno),
-                   _("Error closing file \"%s\": %s"), filename, g_strerror(errno));
+               if(error)
+                       *error = g_error_new(G_IO_ERROR, g_io_error_from_errno(errno),
+                               _("Error closing file \"%s\": %s"), filename, g_strerror(errno));
                return FALSE;
        }
        return TRUE;
@@ -1505,3 +1510,30 @@ chimara_glk_update_style(ChimaraGlk *glk)
        g_mutex_unlock(priv->arrange_lock);
        gtk_widget_queue_resize( GTK_WIDGET(priv->self) );
 }
+
+/**
+ * chimara_glk_set_resource_load_callback:
+ * @glk: a #ChimaraGlk widget
+ * @func: a function to call for loading resources, or %NULL
+ * @user_data: user data to pass to @func, or %NULL
+ *
+ * Sometimes it is preferable to load image and sound resources from somewhere
+ * else than a Blorb file, for example while developing a game. Section 14 of
+ * the <ulink url="http://eblong.com/zarf/blorb/blorb.html#s14">Blorb
+ * specification</ulink> allows for this possibility. This function sets @func
+ * to be called when the Glk program requests loading an image or sound without
+ * a Blorb resource map having been loaded, optionally passing @user_data as an 
+ * extra parameter.
+ *
+ * Note that @func is only called if no Blorb resource map has been set; having
+ * a resource map in place overrides this function.
+ *
+ * To deactivate the callback, call this function with @func set to %NULL.
+ */
+void
+chimara_glk_set_resource_load_callback(ChimaraGlk *glk, ChimaraResourceLoadFunc func, gpointer user_data)
+{
+       CHIMARA_GLK_USE_PRIVATE(glk, priv);
+       priv->resource_load_callback = func;
+       priv->resource_load_callback_data = user_data;
+}