1 files changed, 344 insertions, 0 deletions
diff --git a/src/libudev-list.c b/src/libudev-list.c
new file mode 100644
index 0000000000..f74a88ca49
--- /dev/null
+++ b/src/libudev-list.c
@@ -0,0 +1,344 @@
+/*
+ * libudev - interface to udev device information
+ *
+ * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This library 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#include "libudev.h"
+#include "libudev-private.h"
+
+/**
+ * SECTION:libudev-list
+ * @short_description: list operation
+ *
+ * Libudev list operations.
+ */
+
+/**
+ * udev_list_entry:
+ *
+ * Opaque object representing one entry in a list. An entry contains
+ * contains a name, and optionally a value.
+ */
+struct udev_list_entry {
+	struct udev_list_node node;
+	struct udev_list *list;
+	char *name;
+	char *value;
+	int num;
+};
+
+/* the list's head points to itself if empty */
+void udev_list_node_init(struct udev_list_node *list)
+{
+	list->next = list;
+	list->prev = list;
+}
+
+int udev_list_node_is_empty(struct udev_list_node *list)
+{
+	return list->next == list;
+}
+
+static void udev_list_node_insert_between(struct udev_list_node *new,
+					  struct udev_list_node *prev,
+					  struct udev_list_node *next)
+{
+	next->prev = new;
+	new->next = next;
+	new->prev = prev;
+	prev->next = new;
+}
+
+void udev_list_node_append(struct udev_list_node *new, struct udev_list_node *list)
+{
+	udev_list_node_insert_between(new, list->prev, list);
+}
+
+void udev_list_node_remove(struct udev_list_node *entry)
+{
+	struct udev_list_node *prev = entry->prev;
+	struct udev_list_node *next = entry->next;
+
+	next->prev = prev;
+	prev->next = next;
+
+	entry->prev = NULL;
+	entry->next = NULL;
+}
+
+/* return list entry which embeds this node */
+static struct udev_list_entry *list_node_to_entry(struct udev_list_node *node)
+{
+	char *list;
+
+	list = (char *)node;
+	list -= offsetof(struct udev_list_entry, node);
+	return (struct udev_list_entry *)list;
+}
+
+void udev_list_init(struct udev *udev, struct udev_list *list, bool unique)
+{
+	memset(list, 0x00, sizeof(struct udev_list));
+	list->udev = udev;
+	list->unique = unique;
+	udev_list_node_init(&list->node);
+}
+
+/* insert entry into a list as the last element  */
+void udev_list_entry_append(struct udev_list_entry *new, struct udev_list *list)
+{
+	/* inserting before the list head make the node the last node in the list */
+	udev_list_node_insert_between(&new->node, list->node.prev, &list->node);
+	new->list = list;
+}
+
+/* insert entry into a list, before a given existing entry */
+void udev_list_entry_insert_before(struct udev_list_entry *new, struct udev_list_entry *entry)
+{
+	udev_list_node_insert_between(&new->node, entry->node.prev, &entry->node);
+	new->list = entry->list;
+}
+
+/* binary search in sorted array */
+static int list_search(struct udev_list *list, const char *name)
+{
+	unsigned int first, last;
+
+	first = 0;
+	last = list->entries_cur;
+	while (first < last) {
+		unsigned int i;
+		int cmp;
+
+		i = (first + last)/2;
+		cmp = strcmp(name, list->entries[i]->name);
+		if (cmp < 0)
+			last = i;
+		else if (cmp > 0)
+			first = i+1;
+		else
+			return i;
+	}
+
+	/* not found, return negative insertion-index+1 */
+	return -(first+1);
+}
+
+struct udev_list_entry *udev_list_entry_add(struct udev_list *list, const char *name, const char *value)
+{
+	struct udev_list_entry *entry;
+	int i = 0;
+
+	if (list->unique) {
+		/* lookup existing name or insertion-index */
+		i = list_search(list, name);
+		if (i >= 0) {
+			entry = list->entries[i];
+
+			dbg(list->udev, "'%s' is already in the list\n", name);
+			free(entry->value);
+			if (value == NULL) {
+				entry->value = NULL;
+				dbg(list->udev, "'%s' value unset\n", name);
+				return entry;
+			}
+			entry->value = strdup(value);
+			if (entry->value == NULL)
+				return NULL;
+			dbg(list->udev, "'%s' value replaced with '%s'\n", name, value);
+			return entry;
+		}
+	}
+
+	/* add new name */
+	entry = calloc(1, sizeof(struct udev_list_entry));
+	if (entry == NULL)
+		return NULL;
+	entry->name = strdup(name);
+	if (entry->name == NULL) {
+		free(entry);
+		return NULL;
+	}
+	if (value != NULL) {
+		entry->value = strdup(value);
+		if (entry->value == NULL) {
+			free(entry->name);
+			free(entry);
+			return NULL;
+		}
+	}
+
+	if (list->unique) {
+		/* allocate or enlarge sorted array if needed */
+		if (list->entries_cur >= list->entries_max) {
+			unsigned int add;
+
+			add = list->entries_max;
+			if (add < 1)
+				add = 64;
+			list->entries = realloc(list->entries, (list->entries_max + add) * sizeof(struct udev_list_entry *));
+			if (list->entries == NULL) {
+				free(entry->name);
+				free(entry->value);
+				return NULL;
+			}
+			list->entries_max += add;
+		}
+
+		/* the negative i returned the insertion index */
+		i = (-i)-1;
+
+		/* insert into sorted list */
+		if ((unsigned int)i < list->entries_cur)
+			udev_list_entry_insert_before(entry, list->entries[i]);
+		else
+			udev_list_entry_append(entry, list);
+
+		/* insert into sorted array */
+		memmove(&list->entries[i+1], &list->entries[i],
+		        (list->entries_cur - i) * sizeof(struct udev_list_entry *));
+		list->entries[i] = entry;
+		list->entries_cur++;
+	} else {
+		udev_list_entry_append(entry, list);
+	}
+
+	dbg(list->udev, "'%s=%s' added\n", entry->name, entry->value);
+	return entry;
+}
+
+void udev_list_entry_delete(struct udev_list_entry *entry)
+{
+	if (entry->list->entries != NULL) {
+		int i;
+		struct udev_list *list = entry->list;
+
+		/* remove entry from sorted array */
+		i = list_search(list, entry->name);
+		if (i >= 0) {
+			memmove(&list->entries[i], &list->entries[i+1],
+			        ((list->entries_cur-1) - i) * sizeof(struct udev_list_entry *));
+			list->entries_cur--;
+		}
+	}
+
+	udev_list_node_remove(&entry->node);
+	free(entry->name);
+	free(entry->value);
+	free(entry);
+}
+
+void udev_list_cleanup(struct udev_list *list)
+{
+	struct udev_list_entry *entry_loop;
+	struct udev_list_entry *entry_tmp;
+
+	free(list->entries);
+	list->entries = NULL;
+	list->entries_cur = 0;
+	list->entries_max = 0;
+	udev_list_entry_foreach_safe(entry_loop, entry_tmp, udev_list_get_entry(list))
+		udev_list_entry_delete(entry_loop);
+}
+
+struct udev_list_entry *udev_list_get_entry(struct udev_list *list)
+{
+	if (udev_list_node_is_empty(&list->node))
+		return NULL;
+	return list_node_to_entry(list->node.next);
+}
+
+/**
+ * udev_list_entry_get_next:
+ * @list_entry: current entry
+ *
+ * Returns: the next entry from the list, #NULL is no more entries are found.
+ */
+UDEV_EXPORT struct udev_list_entry *udev_list_entry_get_next(struct udev_list_entry *list_entry)
+{
+	struct udev_list_node *next;
+
+	if (list_entry == NULL)
+		return NULL;
+	next = list_entry->node.next;
+	/* empty list or no more entries */
+	if (next == &list_entry->list->node)
+		return NULL;
+	return list_node_to_entry(next);
+}
+
+/**
+ * udev_list_entry_get_by_name:
+ * @list_entry: current entry
+ * @name: name string to match
+ *
+ * Returns: the entry where @name matched, #NULL if no matching entry is found.
+ */
+UDEV_EXPORT struct udev_list_entry *udev_list_entry_get_by_name(struct udev_list_entry *list_entry, const char *name)
+{
+	int i;
+
+	if (list_entry == NULL)
+		return NULL;
+
+	if (!list_entry->list->unique)
+		return NULL;
+
+	i = list_search(list_entry->list, name);
+	if (i < 0)
+		return NULL;
+	return list_entry->list->entries[i];
+}
+
+/**
+ * udev_list_entry_get_name:
+ * @list_entry: current entry
+ *
+ * Returns: the name string of this entry.
+ */
+UDEV_EXPORT const char *udev_list_entry_get_name(struct udev_list_entry *list_entry)
+{
+	if (list_entry == NULL)
+		return NULL;
+	return list_entry->name;
+}
+
+/**
+ * udev_list_entry_get_value:
+ * @list_entry: current entry
+ *
+ * Returns: the value string of this entry.
+ */
+UDEV_EXPORT const char *udev_list_entry_get_value(struct udev_list_entry *list_entry)
+{
+	if (list_entry == NULL)
+		return NULL;
+	return list_entry->value;
+}
+
+int udev_list_entry_get_num(struct udev_list_entry *list_entry)
+{
+	if (list_entry == NULL)
+		return -EINVAL;
+	return list_entry->num;
+}
+
+void udev_list_entry_set_num(struct udev_list_entry *list_entry, int num)
+{
+	if (list_entry == NULL)
+		return;
+	list_entry->num = num;
+}