Import sources from 2011-03-30 iso image

sys/src/libndb/ndbdiscard.c

@@ -0,0 +1,30 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include <ndb.h>
+
+/* remove a from t and free it */
+Ndbtuple*
+ndbdiscard(Ndbtuple *t, Ndbtuple *a)
+{
+	Ndbtuple *nt;
+
+	/* unchain a */
+	for(nt = t; nt != nil; nt = nt->entry){
+		if(nt->line == a)
+			nt->line = a->line;
+		if(nt->entry == a)
+			nt->entry = a->entry;
+	}
+
+	/* a may be start of chain */
+	if(t == a)
+		t = a->entry;
+
+	/* free a */
+	a->entry = nil;
+	ndbfree(a);
+
+	ndbsetmalloctag(t, getcallerpc(&t));
+	return t;
+}