From e5888a1ffdae813d7575f5fb02275c6bb07e5199 Mon Sep 17 00:00:00 2001
From: Taru Karttunen <taruti@taruti.net>
Date: Wed, 30 Mar 2011 15:46:40 +0300
Subject: Import sources from 2011-03-30 iso image

---
 sys/src/libndb/ndbdiscard.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100755 sys/src/libndb/ndbdiscard.c

(limited to 'sys/src/libndb/ndbdiscard.c')

diff --git a/sys/src/libndb/ndbdiscard.c b/sys/src/libndb/ndbdiscard.c
new file mode 100755
index 000000000..ea557ffc5
--- /dev/null
+++ b/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;
+}
-- 
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