libsystemd: add sd-hwdb library

This is libudev-hwdb, but decoupled from libudev and in the libsystemd style.

The core code is unchanged, apart from the following minor changes:

 - hwdb.bin located in /**/systemd/hwdb/ take preference over the ones located
   in /**/udev/
 - properties are stored internally in an OrderedHashmap, rather than a
   linked list.
 - a new API call allows individual properties to be queried directly, rather
   than iterating over them all
 - the iteration over properties have been moved inside the library, rather than
   exposing a list directly
 - the unused 'flags' parameter was dropped

1 files changed, 46 insertions, 0 deletions

diff --git a/src/systemd/sd-hwdb.h b/src/systemd/sd-hwdb.h
new file mode 100644
index 000000000..fae9b9fd4
--- /dev/null
+++ b/src/systemd/sd-hwdb.h
@@ -0,0 +1,46 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foosdhwdbhfoo
+#define foosdhwdbhfoo
+
+/***
+  This file is part of systemd.
+
+  Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
+  Copyright 2014 Tom Gundersen <teg@jklm.no>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "_sd-common.h"
+
+_SD_BEGIN_DECLARATIONS;
+
+typedef struct sd_hwdb sd_hwdb;
+
+sd_hwdb *sd_hwdb_ref(sd_hwdb *hwdb);
+sd_hwdb *sd_hwdb_unref(sd_hwdb *hwdb);
+
+int sd_hwdb_new(sd_hwdb **ret);
+
+int sd_hwdb_get(sd_hwdb *hwdb, const char *modalias, const char *key, const char **value);
+
+int sd_hwdb_seek(sd_hwdb *hwdb, const char *modalias);
+int sd_hwdb_enumerate(sd_hwdb *hwdb, const char **key, const char **value);
+
+#define FOREACH_HWDB_PROPERTY(hwdb, modalias, key, value)               \
+        if (sd_hwdb_seek(hwdb, modalias) >= 0)                          \
+                while (sd_hwdb_enumerate(hwdb, &(key), &(value)) > 0)
+
+#endif