X-Git-Url: https://git.distorted.org.uk/~mdw/sod/blobdiff_plain/e0808c472145fc81e52898bc9ac289e10c4f4f41..fddbedf7b1b4b19add30eeb62281748cc77e6955:/lib/sod.c

diff --git a/lib/sod.c b/lib/sod.c
index 1e8d061..a21a599 100644
--- a/lib/sod.c
+++ b/lib/sod.c
@@ -120,4 +120,71 @@ void *sod_convert(const SodClass *cls, const void *obj)
   return ((char *)obj - vt->_base + chain->off_ichain);
 }
 
+/* --- @sod_init@, @sod_initv@ --- *
+ *
+ * Arguments:	@const SodClass *cls@ = class object for new instance
+ *		@void *p@ = pointer to storage for new instance
+ *		@va_list ap, ...@ = initialization keyword arguments
+ *
+ * Returns:	Pointer to the initialized instance.
+ *
+ * Use:		Initializes an instance in pre-allocated storage, and returns
+ *		a pointer to it.
+ *
+ *		This function will imprint the storage, and then send an
+ *		`initialize' message to the fresh instance containing the
+ *		provided keyword arguments.
+ *
+ *		It's usually convenient to use the macro @SOD_INIT@ rather
+ *		than calling @sod_init@ directly.
+ */
+
+void *sod_init(const SodClass *cls, void *p, ...)
+{
+  va_list ap;
+
+  va_start(ap, p);
+  sod_initv(cls, p, ap);
+  va_end(ap);
+  return (p);
+}
+
+void *sod_initv(const SodClass *cls, void *p, va_list ap)
+{
+  SodObject *obj;
+
+  cls->cls.imprint(p);
+  obj = SOD_CONVERT(SodObject, p);
+  SodObject_init__v(obj, ap);
+  return (p);
+}
+
+/* --- @sod_teardown@ --- *
+ *
+ * Arguments:	@void *p@ = pointer to an instance to be torn down
+ *
+ * Returns:	Zero if the object is torn down; nonzero if it refused for
+ *		some reason.
+ *
+ * Use:		Invokes the instance's `teardown' method to release any held
+ *		resources.
+ *
+ *		If this function returns nonzero, then the object is still
+ *		active, and may still hold important resources.  This is not
+ *		intended to be a failure condition: failures in teardown are
+ *		usually unrecoverable (or very hard to recover from) and
+ *		should probably cause the program to abort.  A refusal, on
+ *		the other hand, means that the object is still live and
+ *		shouldn't be deallocated, but that this is a normal situation
+ *		and the caller shouldn't worry about it.
+ */
+
+int sod_teardown(void *p)
+{
+  SodObject *obj;
+
+  obj = SOD_CONVERT(SodObject, p);
+  return (SodObject_teardown(obj));
+}
+
 /*----- That's all, folks -------------------------------------------------*/