unix-ffi/sqlite3: Add optional parameter for URI support.

This commit adds the ability to enable URI on the connect, as can be done
in the cpython sqlite3 module. URI allows, among other things, to create
a shared named in-memory database, which non URI filenames cannot create.

Signed-off-by: Robert Klink <rhermanklink@ripe.net>

unix-ffi/sqlite3/sqlite3.py

@@ -6,6 +6,8 @@ import uctypes
 sq3 = ffilib.open("libsqlite3")
 
 sqlite3_open = sq3.func("i", "sqlite3_open", "sp")
+# int sqlite3_config(int, ...);
+sqlite3_config = sq3.func("i", "sqlite3_config", "ii")
 # int sqlite3_close(sqlite3*);
 sqlite3_close = sq3.func("i", "sqlite3_close", "p")
 # int sqlite3_prepare(
@@ -52,6 +54,8 @@ SQLITE_TEXT = 3
 SQLITE_BLOB = 4
 SQLITE_NULL = 5
 
+SQLITE_CONFIG_URI = 17
+
 
 class Error(Exception):
     pass
@@ -136,7 +140,9 @@ class Cursor:
         check_error(self.h, res)
 
 
-def connect(fname):
+def connect(fname, uri=False):
+    sqlite3_config(SQLITE_CONFIG_URI, int(uri))
+
     sqlite_ptr = bytes(get_ptr_size())
     sqlite3_open(fname, sqlite_ptr)
     return Connections(int.from_bytes(sqlite_ptr, sys.byteorder))