From bab6be80775e1c49f876418c90d9d267694d387b Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@symas.com>
Date: Tue, 16 Aug 2011 16:47:15 -0700
Subject: [PATCH] Add mdb_strerror(), mdb_env_set_flags()

---
 libraries/libmdb/mdb.c | 34 ++++++++++++++++++++++++++++++++++
 libraries/libmdb/mdb.h |  2 ++
 2 files changed, 36 insertions(+)

diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index b71f1fd..c13cb6c 100644
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -460,6 +460,27 @@ mdb_version(int *maj, int *min, int *pat)
 	return MDB_VERSION_STRING;
 }
 
+static const char *errstr[] = {
+	"MDB_KEYEXIST: Key/data pair already exists",
+	"MDB_NOTFOUND: No matching key/data pair found",
+	"MDB_PAGE_NOTFOUND: Requested page not found",
+	"MDB_CORRUPTED: Located page was wrong type",
+	"MDB_PANIC: Update of meta page failed",
+	"MDB_VERSION_MISMATCH: Database environment version mismatch"
+};
+
+char *
+mdb_strerror(int err)
+{
+	if (!err)
+		return ("Successful return: 0");
+
+	if (err >= MDB_KEYEXIST && err <= MDB_VERSION_MISMATCH)
+		return (char *)errstr[err - MDB_KEYEXIST];
+
+	return strerror(err);
+}
+
 int
 mdb_cmp(MDB_txn *txn, MDB_dbi dbi, const MDB_val *a, const MDB_val *b)
 {
@@ -3160,6 +3181,19 @@ mdb_put(MDB_txn *txn, MDB_dbi dbi,
 	return mdb_put0(txn, dbi, key, data, flags);
 }
 
+int
+mdb_env_set_flags(MDB_env *env, unsigned int flag, int onoff)
+{
+#define	CHANGEABLE	(MDB_NOSYNC)
+	if ((flag & CHANGEABLE) != flag)
+		return EINVAL;
+	if (onoff)
+		env->me_flags |= flag;
+	else
+		env->me_flags &= ~flag;
+	return MDB_SUCCESS;
+}
+
 int
 mdb_env_get_flags(MDB_env *env, unsigned int *arg)
 {
diff --git a/libraries/libmdb/mdb.h b/libraries/libmdb/mdb.h
index 30d4e92..372dfc1 100644
--- a/libraries/libmdb/mdb.h
+++ b/libraries/libmdb/mdb.h
@@ -114,11 +114,13 @@ typedef struct MDB_stat {
 } MDB_stat;
 
 char *mdb_version(int *major, int *minor, int *patch);
+char *mdb_strerror(int err);
 int  mdb_env_create(MDB_env **env);
 int  mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode);
 int  mdb_env_stat(MDB_env *env, MDB_stat *stat);
 int  mdb_env_sync(MDB_env *env, int force);
 void mdb_env_close(MDB_env *env);
+int  mdb_env_set_flags(MDB_env *env, unsigned int flags, int onoff);
 int  mdb_env_get_flags(MDB_env *env, unsigned int *flags);
 int  mdb_env_get_path(MDB_env *env, const char **path);
 int  mdb_env_set_mapsize(MDB_env *env, size_t size);