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|
(***********************************************************************)
(* *)
(* Objective Caml *)
(* *)
(* Francois Rouaix, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU Library General Public License. *)
(* *)
(***********************************************************************)
(* $Id$ *)
type t
type open_flag =
Dbm_rdonly | Dbm_wronly | Dbm_rdwr | Dbm_create
type dbm_flag =
DBM_INSERT
| DBM_REPLACE
exception Dbm_error of string
external raw_opendbm : string -> open_flag list -> int -> t
= "caml_dbm_open"
let opendbm file flags mode =
try
raw_opendbm file flags mode
with Dbm_error msg ->
raise(Dbm_error("Can't open file " ^ file))
(* By exporting opendbm as val, we are sure to link in this
file (we must register the exception). Since t is abstract, programs
have to call it in order to do anything *)
external close : t -> unit = "caml_dbm_close"
external find : t -> string -> string = "caml_dbm_fetch"
external add : t -> string -> string -> unit = "caml_dbm_insert"
external replace : t -> string -> string -> unit = "caml_dbm_replace"
external remove : t -> string -> unit = "caml_dbm_delete"
external firstkey : t -> string = "caml_dbm_firstkey"
external nextkey : t -> string = "caml_dbm_nextkey"
let _ = Callback.register_exception "dbmerror" (Dbm_error "")
(* Usual iterator *)
let iter f t =
let rec walk k =
f k (find t k);
match try Some(nextkey t) with Not_found -> None
with
None -> ()
| Some k -> walk k
in
walk (firstkey t)
|
