Add libxkbregistry to query available RMLVO

This library is the replacement for clients parsing evdev.xml directly.
Instead, they should use the API here so that in the future we may even
be able to swap evdev.xml for a more suitable data format.

The library parses through evdev.xml (using libxml2) and - if requested -
through evdev.extras.xml as well. The merge approach is optimised for
the default case where we have a system-installed rules XML and another file in
$XDG_CONFIG_DIR that adds a few entries.  We load the system file first, then
append any custom ones to that. It's not possible to overwrite the MLVO list
provided by the system files - if you want to do that, get the change upstream.

XML validation is handled through the DTD itself which means we only need to
check for a nonempty name, everything else the DTD validation should complain
about.

The logging system is effectively identical to xkbcommon.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

1 files changed, 94 insertions, 0 deletions

diff --git a/src/util-list.c b/src/util-list.c
new file mode 100644
index 0000000..b6f5069
--- /dev/null
+++ b/src/util-list.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright © 2008-2011 Kristian Høgsberg
+ * Copyright © 2011 Intel Corporation
+ * Copyright © 2013-2015 Red Hat, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "config.h"
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#include "util-list.h"
+
+void
+list_init(struct list *list)
+{
+	list->prev = list;
+	list->next = list;
+}
+
+void
+list_insert(struct list *list, struct list *elm)
+{
+	assert((list->next != NULL && list->prev != NULL) ||
+	       !"list->next|prev is NULL, possibly missing list_init()");
+	assert(((elm->next == NULL && elm->prev == NULL) || list_empty(elm)) ||
+	       !"elm->next|prev is not NULL, list node used twice?");
+
+	elm->prev = list;
+	elm->next = list->next;
+	list->next = elm;
+	elm->next->prev = elm;
+}
+
+void
+list_append(struct list *list, struct list *elm)
+{
+	assert((list->next != NULL && list->prev != NULL) ||
+	       !"list->next|prev is NULL, possibly missing list_init()");
+	assert(((elm->next == NULL && elm->prev == NULL) || list_empty(elm)) ||
+	       !"elm->next|prev is not NULL, list node used twice?");
+
+	elm->next = list;
+	elm->prev = list->prev;
+	list->prev = elm;
+	elm->prev->next = elm;
+}
+
+void
+list_remove(struct list *elm)
+{
+	assert((elm->next != NULL && elm->prev != NULL) ||
+	       !"list->next|prev is NULL, possibly missing list_init()");
+
+	elm->prev->next = elm->next;
+	elm->next->prev = elm->prev;
+	elm->next = NULL;
+	elm->prev = NULL;
+}
+
+bool
+list_empty(const struct list *list)
+{
+	assert((list->next != NULL && list->prev != NULL) ||
+	       !"list->next|prev is NULL, possibly missing list_init()");
+
+	return list->next == list;
+}
+
+bool
+list_is_last(const struct list *list, const struct list *elm)
+{
+	return elm->next == list;
+}