add really basic yaml document graph building and writing functionality

libifupdown/yaml-base.c

@@ -0,0 +1,109 @@
+/*
+ * libifupdown/yaml-base.c
+ * Purpose: YAML implementation -- base
+ *
+ * Copyright (c) 2020 Ariadne Conill <ariadne@dereferenced.org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * This software is provided 'as is' and without any warranty, express or
+ * implied.  In no event shall the authors be liable for any damages arising
+ * from the use of this software.
+ */
+
+#include <string.h>
+#include "libifupdown/libifupdown.h"
+#include "libifupdown/yaml-base.h"
+
+void
+lif_yaml_document_init(struct lif_yaml_node *doc, const char *name)
+{
+	memset(doc, '\0', sizeof *doc);
+	doc->value_type = LIF_YAML_OBJECT;
+
+	if (name != NULL)
+		doc->name = strdup(name);
+}
+
+struct lif_yaml_node *
+lif_yaml_document_new(const char *name)
+{
+	struct lif_yaml_node *doc = calloc(1, sizeof *doc);
+
+	lif_yaml_document_init(doc, name);
+	doc->malloced = true;
+
+	return doc;
+}
+
+struct lif_yaml_node *
+lif_yaml_node_new_string(const char *name, const char *value)
+{
+	struct lif_yaml_node *node = calloc(1, sizeof *node);
+
+	node->malloced = true;
+	node->value_type = LIF_YAML_STRING;
+
+	if (name != NULL)
+		node->name = strdup(name);
+
+	if (value != NULL)
+		node->value = strdup(value);
+
+	return node;
+}
+
+struct lif_yaml_node *
+lif_yaml_node_new_object(const char *name)
+{
+	struct lif_yaml_node *node = calloc(1, sizeof *node);
+
+	node->malloced = true;
+	node->value_type = LIF_YAML_OBJECT;
+
+	if (name != NULL)
+		node->name = strdup(name);
+
+	return node;
+}
+
+struct lif_yaml_node *
+lif_yaml_node_new_list(const char *name)
+{
+	struct lif_yaml_node *node = calloc(1, sizeof *node);
+
+	node->malloced = true;
+	node->value_type = LIF_YAML_LIST;
+
+	if (name != NULL)
+		node->name = strdup(name);
+
+	return node;
+}
+
+void
+lif_yaml_node_free(struct lif_yaml_node *node)
+{
+	struct lif_node *iter, *next;
+
+	LIF_LIST_FOREACH_SAFE(iter, next, node->children.head)
+	{
+		struct lif_yaml_node *iter_node = iter->data;
+
+		lif_yaml_node_free(iter_node);
+	}
+
+	free(node->name);
+	free(node->value);
+
+	if (node->malloced)
+		free(node);
+}
+
+void
+lif_yaml_node_append_child(struct lif_yaml_node *parent, struct lif_yaml_node *child)
+{
+	lif_node_insert_tail(&child->node, child, &parent->children);
+}