Debian package wip

[chiark-tcl.git] / cdb / readonly.c

diff --git a/cdb/readonly.c b/cdb/readonly.c
index b644a1d9c72908a133841d516e71fdc8a9234d17..7a3ba446439b825fa8b51c05ba62b48d486b69ff 100644 (file)
--- a/cdb/readonly.c
+++ b/cdb/readonly.c
@@ -1,9 +1,103 @@
-/**/
+/*
+ * cdb, cdb-wr - Tcl bindings for tinycdb and a journalling write extension
+ * Copyright 2006 Ian Jackson
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
 
 #include "chiark_tcl_cdb.h"
 
-static void destroy_cdb_idtabcb(Tcl_Interp *ip, void *val) { abort(); }
+typedef struct Ro {
+  int ix, fd;
+  struct cdb cdb;
+} Ro;
+
+static void ro_close(Ro *ro) {
+  cdb_free(&ro->cdb);
+  close(ro->fd);
+}
+
+static void destroy_cdb_idtabcb(Tcl_Interp *ip, void *ro_v) {
+  ro_close(ro_v);
+  TFREE(ro_v);
+}
 
 const IdDataSpec cdbtcl_databases= {
   "cdb-db", "cdb-opendatabases-table", destroy_cdb_idtabcb
 };
+
+int cht_do_cdb_open(ClientData cd, Tcl_Interp *ip,
+                   const char *path, void **result) {
+  Ro *ro;
+  int rc, r;
+
+  ro= TALLOC(sizeof(*ro));
+  ro->ix= -1;
+  ro->fd= open(path, O_RDONLY);
+  if (ro->fd<0) PE("open database file");
+  r= cdb_init(&ro->cdb, ro->fd);
+  if (r) PE("initialise cdb");
+  *result= ro;
+  return TCL_OK;
+
+ x_rc:
+  if (ro->fd >= 0) close(ro->fd);
+  return rc;
+}
+
+int cht_do_cdb_close(ClientData cd, Tcl_Interp *ip, void *ro_v) {
+  ro_close(ro_v);
+  cht_tabledataid_disposing(ip, ro_v, &cdbtcl_databases);
+  TFREE(ro_v);
+  return TCL_OK;
+}
+
+int cht_do_cdb_lookup(ClientData cd, Tcl_Interp *ip, void *ro_v,
+                     Tcl_Obj *keyo, Tcl_Obj *def, Tcl_Obj **result) {
+  Ro *ro= ro_v;
+  const Byte *key;
+  const Byte *data;
+  int r, dlen, klen;
+
+  key= Tcl_GetStringFromObj(keyo, &klen);  assert(key);
+  
+  r= cht_cdb_lookup_cdb(ip, &ro->cdb, key, klen, &data, &dlen);
+  if (r) return r;
+  
+  return cht_cdb_donesomelookup(ip, ro_v, def, result, data, dlen,
+                               cht_cdb_storeanswer_string);
+}
+
+int cht_do_cdb_lookup_hb(ClientData cd, Tcl_Interp *ip, void *ro_v,
+                        HBytes_Value key, Tcl_Obj *def, Tcl_Obj **result) {
+  Ro *ro= ro_v;
+  const Byte *data;
+  int r, dlen;
+  
+  r= cht_cdb_lookup_cdb(ip, &ro->cdb,
+                       cht_hb_data(&key), cht_hb_len(&key),
+                       &data, &dlen);
+  if (r) return r;
+  
+  return cht_cdb_donesomelookup(ip, ro_v, def, result, data, dlen,
+                               cht_cdb_storeanswer_hb);
+}
+
+int cht_do_cdbtoplevel_cdb(ClientData cd, Tcl_Interp *ip,
+                          const Cdb_SubCommand* subcmd,
+                          int objc, Tcl_Obj *const *objv) {
+  return subcmd->func((void*)subcmd,ip,objc,objv);
+}