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/* This file is part of Eclat.
Copyright (C) 2012 Sergey Poznyakoff.
Eclat 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 3, or (at your option)
any later version.
Eclat 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 Eclat. If not, see <http://www.gnu.org/licenses/>. */
#include "libeclat.h"
#include <gdbm.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
struct gdbm_map {
char *name;
GDBM_FILE file;
struct grecs_locus locus;
int nullflag;
};
static int
gdbm_map_config(int dbg, struct grecs_node *node, void *data)
{
struct gdbm_map *gdbm_map, **return_gdbm_map = data;
const char *filename;
struct grecs_node *p;
if (eclat_get_string_node(node, "file", 0, &p))
return eclat_map_failure;
gdbm_map = grecs_malloc(sizeof(*gdbm_map));
gdbm_map->name = grecs_strdup(p->v.value->v.string);
gdbm_map->locus = p->locus;
switch (eclat_get_string_node(node, "null", 1, &p)) {
case eclat_map_failure:
return eclat_map_failure;
case eclat_map_not_found:
break;
case eclat_map_ok:
if (grecs_string_convert(&gdbm_map->nullflag, grecs_type_bool,
p->v.value->v.string,
&p->locus))
return eclat_map_failure;
}
*return_gdbm_map = gdbm_map;
return eclat_map_ok;
}
static void
gdbm_map_free(int dbg, void *data)
{
struct gdbm_map *gdbm_map = data;
free(gdbm_map->name);
free(gdbm_map);
}
static int
gdbm_map_open(int dbg, void *data)
{
struct gdbm_map *gdbm_map = data;
gdbm_map->file = gdbm_open(gdbm_map->name, 512, GDBM_READER, O_RDONLY,
NULL);
if (gdbm_map->file == NULL)
return eclat_map_failure;
return eclat_map_ok;
}
static int
gdbm_map_close(int dbg, void *data)
{
struct gdbm_map *gdbm_map = data;
gdbm_close(gdbm_map->file);
return eclat_map_ok;
}
static int
gdbm_map_get(int dbg, void *data, const char *key, char **return_value)
{
struct gdbm_map *gdbm_map = data;
datum keydat, content;
keydat.dptr = (char*)key;
keydat.dsize = strlen(key) + (gdbm_map->nullflag ? 1 : 0);
gdbm_errno = 0;
content = gdbm_fetch(gdbm_map->file, keydat);
if (content.dptr == NULL) {
if (gdbm_errno == GDBM_ITEM_NOT_FOUND)
return eclat_map_not_found;
err("%s: %s", gdbm_map->name, gdbm_strerror(gdbm_errno));
return eclat_map_failure;
}
*return_value = grecs_malloc(content.dsize + 1);
memcpy(*return_value, content.dptr, content.dsize);
(*return_value)[content.dsize] = 0;
free (content.dptr);
return eclat_map_ok;
}
struct eclat_map_drv eclat_map_drv_gdbm = {
"gdbm",
gdbm_map_config,
gdbm_map_open,
gdbm_map_close,
gdbm_map_get,
gdbm_map_free
};
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