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mdbx: initial mdbx_cursor_on_ first/last().

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Leo Yuriev
2017-02-15 20:16:07 +03:00
parent d47d8c25d8
commit 2b924524ec
2 changed files with 52 additions and 2 deletions
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13
mdbx.h
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@@ -219,10 +219,19 @@ typedef struct mdbx_canary {
int mdbx_canary_put(MDB_txn *txn, const mdbx_canary* canary);
size_t mdbx_canary_get(MDB_txn *txn, mdbx_canary* canary);
/* Returns 1 when no more data available or cursor not positioned,
* 0 otherwise or less that zero in error case. */
/* Returns:
* - MDBX_RESULT_TRUE when no more data available
* or cursor not positioned;
* - MDBX_RESULT_FALSE when data available;
* - Otherwise the error code. */
int mdbx_cursor_eof(MDB_cursor *mc);
/* Returns: MDBX_RESULT_TRUE, MDBX_RESULT_FALSE or Error code. */
int mdbx_cursor_on_first(MDB_cursor *mc);
/* Returns: MDBX_RESULT_TRUE, MDBX_RESULT_FALSE or Error code. */
int mdbx_cursor_on_last(MDB_cursor *mc);
#define MDBX_EMULTIVAL (MDB_LAST_ERRCODE - 42)
#define MDBX_RESULT_FALSE MDB_SUCCESS
#define MDBX_RESULT_TRUE (-1)