X-Git-Url: https://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Ftdb2%2Ftraverse.c;h=06f0bc68ee4016b5a90330025f1c2ee34d1ad108;hb=3d917ba6dffe2029608a3d4c870dfdb4033ca4c9;hp=66319dd56764d823dfca54544cfd2ee0d22aea03;hpb=6804501c350181dea8f531142b28c620b70edbd9;p=ccan

diff --git a/ccan/tdb2/traverse.c b/ccan/tdb2/traverse.c
index 66319dd5..06f0bc68 100644
--- a/ccan/tdb2/traverse.c
+++ b/ccan/tdb2/traverse.c
@@ -1,7 +1,7 @@
- /* 
+ /*
    Trivial Database 2: traverse function.
    Copyright (C) Rusty Russell 2010
-   
+
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
@@ -18,41 +18,71 @@
 #include "private.h"
 #include <ccan/likely/likely.h>
 
-static int64_t traverse(struct tdb_context *tdb, int ltype,
-			tdb_traverse_func fn, void *p)
+int64_t tdb_traverse(struct tdb_context *tdb, tdb_traverse_func fn, void *p)
 {
-	int ret;
+	enum TDB_ERROR ecode;
 	struct traverse_info tinfo;
 	struct tdb_data k, d;
 	int64_t count = 0;
 
-	for (ret = first_in_hash(tdb, ltype, &tinfo, &k, &d.dsize);
-	     ret == 1;
-	     ret = next_in_hash(tdb, ltype, &tinfo, &k, &d.dsize)) {
+	k.dptr = NULL;
+	for (ecode = first_in_hash(tdb, &tinfo, &k, &d.dsize);
+	     ecode == TDB_SUCCESS;
+	     ecode = next_in_hash(tdb, &tinfo, &k, &d.dsize)) {
 		d.dptr = k.dptr + k.dsize;
 		
 		count++;
-		if (fn && fn(tdb, k, d, p))
+		if (fn && fn(tdb, k, d, p)) {
+			free(k.dptr);
 			break;
+		}
+		free(k.dptr);
 	}
 
-	if (ret < 0)
+	if (ecode != TDB_ERR_NOEXIST) {
+		tdb->ecode = ecode;
 		return -1;
+	}
 	return count;
 }
-
-int64_t tdb_traverse(struct tdb_context *tdb, tdb_traverse_func fn, void *p)
+	
+TDB_DATA tdb_firstkey(struct tdb_context *tdb)
 {
-	return traverse(tdb, F_WRLCK, fn, p);
+	struct traverse_info tinfo;
+	struct tdb_data k;
+	enum TDB_ERROR ecode;
+
+	ecode = first_in_hash(tdb, &tinfo, &k, NULL);
+	if (ecode == TDB_SUCCESS) {
+		return k;
+	}
+	if (ecode == TDB_ERR_NOEXIST)
+		ecode = TDB_SUCCESS;
+	tdb->ecode = ecode;
+	return tdb_null;
 }
-	
-int64_t tdb_traverse_read(struct tdb_context *tdb,
-			  tdb_traverse_func fn, void *p)
+
+/* We lock twice, not very efficient.  We could keep last key & tinfo cached. */
+TDB_DATA tdb_nextkey(struct tdb_context *tdb, TDB_DATA key)
 {
-	int64_t ret;
-	bool was_ro = tdb->read_only;
-	tdb->read_only = true;
-	ret = traverse(tdb, F_RDLCK, fn, p);
-	tdb->read_only = was_ro;
-	return ret;
+	struct traverse_info tinfo;
+	struct hash_info h;
+	struct tdb_used_record rec;
+	enum TDB_ERROR ecode;
+
+	tinfo.prev = find_and_lock(tdb, key, F_RDLCK, &h, &rec, &tinfo);
+	if (TDB_OFF_IS_ERR(tinfo.prev)) {
+		tdb->ecode = tinfo.prev;
+		return tdb_null;
+	}
+	tdb_unlock_hashes(tdb, h.hlock_start, h.hlock_range, F_RDLCK);
+
+	ecode = next_in_hash(tdb, &tinfo, &key, NULL);
+	if (ecode == TDB_SUCCESS) {
+		return key;
+	}
+	if (ecode == TDB_ERR_NOEXIST)
+		ecode = TDB_SUCCESS;
+	tdb->ecode = ecode;
+	return tdb_null;
 }