162 lines
4.2 KiB
C
162 lines
4.2 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Francois Rouaix, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License, with */
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/* the special exception on linking described in file ../../LICENSE. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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#include <string.h>
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#include <fcntl.h>
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#include <ndbm.h>
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#include <mlvalues.h>
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#include <alloc.h>
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#include <memory.h>
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#include <fail.h>
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#include <callback.h>
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/* Quite close to sys_open_flags, but we need RDWR */
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static int dbm_open_flags[] = {
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O_RDONLY, O_WRONLY, O_RDWR, O_CREAT
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};
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static void raise_dbm (char *errmsg) Noreturn;
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static void raise_dbm(char *errmsg)
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{
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static value * dbm_exn = NULL;
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if (dbm_exn == NULL)
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dbm_exn = caml_named_value("dbmerror");
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raise_with_string(*dbm_exn, errmsg);
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}
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#define DBM_val(v) *((DBM **) &Field(v, 0))
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static value alloc_dbm(DBM * db)
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{
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value res = alloc_small(1, Abstract_tag);
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DBM_val(res) = db;
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return res;
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}
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static DBM * extract_dbm(value vdb)
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{
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if (DBM_val(vdb) == NULL) raise_dbm("DBM has been closed");
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return DBM_val(vdb);
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}
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/* Dbm.open : string -> Sys.open_flag list -> int -> t */
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value caml_dbm_open(value vfile, value vflags, value vmode) /* ML */
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{
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char *file = String_val(vfile);
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int flags = convert_flag_list(vflags, dbm_open_flags);
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int mode = Int_val(vmode);
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DBM *db = dbm_open(file,flags,mode);
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if (db == NULL)
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raise_dbm("Can't open file");
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else
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return (alloc_dbm(db));
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}
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/* Dbm.close: t -> unit */
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value caml_dbm_close(value vdb) /* ML */
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{
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dbm_close(extract_dbm(vdb));
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DBM_val(vdb) = NULL;
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return Val_unit;
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}
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/* Dbm.fetch: t -> string -> string */
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value caml_dbm_fetch(value vdb, value vkey) /* ML */
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{
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datum key,answer;
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key.dptr = String_val(vkey);
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key.dsize = string_length(vkey);
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answer = dbm_fetch(extract_dbm(vdb), key);
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if (answer.dptr) {
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value res = alloc_string(answer.dsize);
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memmove (String_val (res), answer.dptr, answer.dsize);
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return res;
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}
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else raise_not_found();
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}
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value caml_dbm_insert(value vdb, value vkey, value vcontent) /* ML */
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{
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datum key, content;
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key.dptr = String_val(vkey);
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key.dsize = string_length(vkey);
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content.dptr = String_val(vcontent);
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content.dsize = string_length(vcontent);
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switch(dbm_store(extract_dbm(vdb), key, content, DBM_INSERT)) {
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case 0:
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return Val_unit;
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case 1: /* DBM_INSERT and already existing */
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raise_dbm("Entry already exists");
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default:
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raise_dbm("dbm_store failed");
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}
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}
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value caml_dbm_replace(value vdb, value vkey, value vcontent) /* ML */
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{
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datum key, content;
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key.dptr = String_val(vkey);
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key.dsize = string_length(vkey);
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content.dptr = String_val(vcontent);
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content.dsize = string_length(vcontent);
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switch(dbm_store(extract_dbm(vdb), key, content, DBM_REPLACE)) {
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case 0:
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return Val_unit;
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default:
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raise_dbm("dbm_store failed");
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}
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}
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value caml_dbm_delete(value vdb, value vkey) /* ML */
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{
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datum key;
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key.dptr = String_val(vkey);
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key.dsize = string_length(vkey);
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if (dbm_delete(extract_dbm(vdb), key) < 0)
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raise_dbm("dbm_delete");
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else return Val_unit;
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}
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value caml_dbm_firstkey(value vdb) /* ML */
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{
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datum key = dbm_firstkey(extract_dbm(vdb));
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if (key.dptr) {
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value res = alloc_string(key.dsize);
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memmove (String_val (res), key.dptr, key.dsize);
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return res;
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}
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else raise_not_found();
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}
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value caml_dbm_nextkey(value vdb) /* ML */
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{
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datum key = dbm_nextkey(extract_dbm(vdb));
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if (key.dptr) {
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value res = alloc_string(key.dsize);
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memmove (String_val (res), key.dptr, key.dsize);
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return res;
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}
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else raise_not_found();
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}
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