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-rw-r--r--lib/gdbmmap.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/lib/gdbmmap.c b/lib/gdbmmap.c
new file mode 100644
index 0000000..4fdaa33
--- /dev/null
+++ b/lib/gdbmmap.c
@@ -0,0 +1,116 @@
+/* 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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