add libucimap

6 files changed, 1134 insertions, 3 deletions

diff --git a/.gitignore b/.gitignore
index c84f7d6..f589c0c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 uci
 uci-static
+ucimap-example
 *.[oa]
 *.so*
 *.dylib*
diff --git a/Makefile b/Makefile
index 69a7431..ffa7be4 100644
--- a/Makefile
+++ b/Makefile
@@ -16,9 +16,10 @@ endef
 
 LIBUCI_DEPS=file.c history.c list.c util.c uci.h uci_config.h uci_internal.h
 
-all: uci-static uci libuci.$(SHLIB_EXT)
+all: uci-static uci libuci.$(SHLIB_EXT) libucimap.a
 
 cli.o: cli.c uci.h uci_config.h
+ucimap.o: ucimap.c uci.h uci_config.h ucimap.h uci_list.h
 
 uci_config.h: FORCE
 	@rm -f "$@.tmp"
@@ -48,6 +49,11 @@ libuci.a: libuci-static.o
 	$(AR) rc $@ $^
 	$(RANLIB) $@
 
+libucimap.a: ucimap.o
+	rm -f $@
+	$(AR) rc $@ $^
+	$(RANLIB) $@
+
 libuci.$(SHLIB_EXT): libuci-shared.o
 	$(LINK) $(SHLIB_FLAGS) -o $(SHLIB_FILE) $^ $(LIBS)
 	ln -sf $(SHLIB_FILE) $@
@@ -60,8 +66,8 @@ install: install-bin install-dev
 install-dev: all
 	$(MKDIR) -p $(DESTDIR)$(prefix)/lib
 	$(MKDIR) -p $(DESTDIR)$(prefix)/include
-	$(INSTALL) -m0644 libuci.a $(DESTDIR)$(prefix)/lib/
-	$(INSTALL) -m0644 uci_config.h uci.h $(DESTDIR)$(prefix)/include/
+	$(INSTALL) -m0644 libuci.a libucimap.a $(DESTDIR)$(prefix)/lib/
+	$(INSTALL) -m0644 uci_config.h uci.h uci_list.h ucimap.h $(DESTDIR)$(prefix)/include/
 
 install-bin: all
 	$(INSTALL) -m0755 $(SHLIB_FILE) $(DESTDIR)$(prefix)/lib/
diff --git a/uci_list.h b/uci_list.h
new file mode 100644
index 0000000..2959a06
--- /dev/null
+++ b/uci_list.h
@@ -0,0 +1,601 @@
+#ifndef _LINUX_LIST_H
+#define _LINUX_LIST_H
+
+#include <stddef.h>
+/**
+ * container_of - cast a member of a structure out to the containing structure
+ * @ptr:	the pointer to the member.
+ * @type:	the type of the container struct this is embedded in.
+ * @member:	the name of the member within the struct.
+ *
+ */
+#ifndef container_of
+#define container_of(ptr, type, member) (			\
+	(type *)( (char *)ptr - offsetof(type,member) ))
+#endif
+
+
+/*
+ * Simple doubly linked list implementation.
+ *
+ * Some of the internal functions ("__xxx") are useful when
+ * manipulating whole lists rather than single entries, as
+ * sometimes we already know the next/prev entries and we can
+ * generate better code by using them directly rather than
+ * using the generic single-entry routines.
+ */
+
+struct list_head {
+	struct list_head *next, *prev;
+};
+
+#define LIST_HEAD_INIT(name) { &(name), &(name) }
+
+#define LIST_HEAD(name) \
+	struct list_head name = LIST_HEAD_INIT(name)
+
+static inline void INIT_LIST_HEAD(struct list_head *list)
+{
+	list->next = list;
+	list->prev = list;
+}
+
+/*
+ * Insert a new entry between two known consecutive entries.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_add(struct list_head *new,
+			      struct list_head *prev,
+			      struct list_head *next)
+{
+	next->prev = new;
+	new->next = next;
+	new->prev = prev;
+	prev->next = new;
+}
+
+/**
+ * list_add - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it after
+ *
+ * Insert a new entry after the specified head.
+ * This is good for implementing stacks.
+ */
+static inline void list_add(struct list_head *new, struct list_head *head)
+{
+	__list_add(new, head, head->next);
+}
+
+
+/**
+ * list_add_tail - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it before
+ *
+ * Insert a new entry before the specified head.
+ * This is useful for implementing queues.
+ */
+static inline void list_add_tail(struct list_head *new, struct list_head *head)
+{
+	__list_add(new, head->prev, head);
+}
+
+
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_del(struct list_head * prev, struct list_head * next)
+{
+	next->prev = prev;
+	prev->next = next;
+}
+
+/**
+ * list_del - deletes entry from list.
+ * @entry: the element to delete from the list.
+ * Note: list_empty() on entry does not return true after this, the entry is
+ * in an undefined state.
+ */
+static inline void list_del(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+	entry->next = NULL;
+	entry->prev = NULL;
+}
+
+/**
+ * list_replace - replace old entry by new one
+ * @old : the element to be replaced
+ * @new : the new element to insert
+ *
+ * If @old was empty, it will be overwritten.
+ */
+static inline void list_replace(struct list_head *old,
+				struct list_head *new)
+{
+	new->next = old->next;
+	new->next->prev = new;
+	new->prev = old->prev;
+	new->prev->next = new;
+}
+
+static inline void list_replace_init(struct list_head *old,
+					struct list_head *new)
+{
+	list_replace(old, new);
+	INIT_LIST_HEAD(old);
+}
+
+/**
+ * list_del_init - deletes entry from list and reinitialize it.
+ * @entry: the element to delete from the list.
+ */
+static inline void list_del_init(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+	INIT_LIST_HEAD(entry);
+}
+
+/**
+ * list_move - delete from one list and add as another's head
+ * @list: the entry to move
+ * @head: the head that will precede our entry
+ */
+static inline void list_move(struct list_head *list, struct list_head *head)
+{
+	__list_del(list->prev, list->next);
+	list_add(list, head);
+}
+
+/**
+ * list_move_tail - delete from one list and add as another's tail
+ * @list: the entry to move
+ * @head: the head that will follow our entry
+ */
+static inline void list_move_tail(struct list_head *list,
+				  struct list_head *head)
+{
+	__list_del(list->prev, list->next);
+	list_add_tail(list, head);
+}
+
+/**
+ * list_is_last - tests whether @list is the last entry in list @head
+ * @list: the entry to test
+ * @head: the head of the list
+ */
+static inline int list_is_last(const struct list_head *list,
+				const struct list_head *head)
+{
+	return list->next == head;
+}
+
+/**
+ * list_empty - tests whether a list is empty
+ * @head: the list to test.
+ */
+static inline int list_empty(const struct list_head *head)
+{
+	return head->next == head;
+}
+
+/**
+ * list_empty_careful - tests whether a list is empty and not being modified
+ * @head: the list to test
+ *
+ * Description:
+ * tests whether a list is empty _and_ checks that no other CPU might be
+ * in the process of modifying either member (next or prev)
+ *
+ * NOTE: using list_empty_careful() without synchronization
+ * can only be safe if the only activity that can happen
+ * to the list entry is list_del_init(). Eg. it cannot be used
+ * if another CPU could re-list_add() it.
+ */
+static inline int list_empty_careful(const struct list_head *head)
+{
+	struct list_head *next = head->next;
+	return (next == head) && (next == head->prev);
+}
+
+static inline void __list_splice(struct list_head *list,
+				 struct list_head *head)
+{
+	struct list_head *first = list->next;
+	struct list_head *last = list->prev;
+	struct list_head *at = head->next;
+
+	first->prev = head;
+	head->next = first;
+
+	last->next = at;
+	at->prev = last;
+}
+
+/**
+ * list_splice - join two lists
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ */
+static inline void list_splice(struct list_head *list, struct list_head *head)
+{
+	if (!list_empty(list))
+		__list_splice(list, head);
+}
+
+/**
+ * list_splice_init - join two lists and reinitialise the emptied list.
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ *
+ * The list at @list is reinitialised
+ */
+static inline void list_splice_init(struct list_head *list,
+				    struct list_head *head)
+{
+	if (!list_empty(list)) {
+		__list_splice(list, head);
+		INIT_LIST_HEAD(list);
+	}
+}
+
+/**
+ * list_entry - get the struct for this entry
+ * @ptr:	the &struct list_head pointer.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_entry(ptr, type, member) \
+	container_of(ptr, type, member)
+
+/**
+ * list_first_entry - get the first element from a list
+ * @ptr:	the list head to take the element from.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Note, that list is expected to be not empty.
+ */
+#define list_first_entry(ptr, type, member) \
+	list_entry((ptr)->next, type, member)
+
+/**
+ * list_for_each	-	iterate over a list
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @head:	the head for your list.
+ */
+#define list_for_each(pos, head) \
+	for (pos = (head)->next; pos != (head); \
+        	pos = pos->next)
+
+/**
+ * __list_for_each	-	iterate over a list
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @head:	the head for your list.
+ *
+ * This variant differs from list_for_each() in that it's the
+ * simplest possible list iteration code, no prefetching is done.
+ * Use this for code that knows the list to be very short (empty
+ * or 1 entry) most of the time.
+ */
+#define __list_for_each(pos, head) \
+	for (pos = (head)->next; pos != (head); pos = pos->next)
+
+/**
+ * list_for_each_prev	-	iterate over a list backwards
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @head:	the head for your list.
+ */
+#define list_for_each_prev(pos, head) \
+	for (pos = (head)->prev; pos != (head); \
+        	pos = pos->prev)
+
+/**
+ * list_for_each_safe - iterate over a list safe against removal of list entry
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @n:		another &struct list_head to use as temporary storage
+ * @head:	the head for your list.
+ */
+#define list_for_each_safe(pos, n, head) \
+	for (pos = (head)->next, n = pos->next; pos != (head); \
+		pos = n, n = pos->next)
+
+/**
+ * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry
+ * @pos:	the &struct list_head to use as a loop cursor.
+ * @n:		another &struct list_head to use as temporary storage
+ * @head:	the head for your list.
+ */
+#define list_for_each_prev_safe(pos, n, head) \
+	for (pos = (head)->prev, n = pos->prev; \
+	     pos != (head); \
+	     pos = n, n = pos->prev)
+
+/**
+ * list_for_each_entry	-	iterate over list of given type
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry(pos, head, member)				\
+	for (pos = list_entry((head)->next, typeof(*pos), member);	\
+	     &pos->member != (head); 	\
+	     pos = list_entry(pos->member.next, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_reverse - iterate backwards over list of given type.
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_reverse(pos, head, member)			\
+	for (pos = list_entry((head)->prev, typeof(*pos), member);	\
+	     &pos->member != (head); 	\
+	     pos = list_entry(pos->member.prev, typeof(*pos), member))
+
+/**
+ * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue()
+ * @pos:	the type * to use as a start point
+ * @head:	the head of the list
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Prepares a pos entry for use as a start point in list_for_each_entry_continue().
+ */
+#define list_prepare_entry(pos, head, member) \
+	((pos) ? : list_entry(head, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_continue - continue iteration over list of given type
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Continue to iterate over list of given type, continuing after
+ * the current position.
+ */
+#define list_for_each_entry_continue(pos, head, member) 		\
+	for (pos = list_entry(pos->member.next, typeof(*pos), member);	\
+	     &pos->member != (head);	\
+	     pos = list_entry(pos->member.next, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_continue_reverse - iterate backwards from the given point
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Start to iterate over list of given type backwards, continuing after
+ * the current position.
+ */
+#define list_for_each_entry_continue_reverse(pos, head, member)		\
+	for (pos = list_entry(pos->member.prev, typeof(*pos), member);	\
+	     &pos->member != (head);	\
+	     pos = list_entry(pos->member.prev, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_from - iterate over list of given type from the current point
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Iterate over list of given type, continuing from current position.
+ */
+#define list_for_each_entry_from(pos, head, member) 			\
+	for (; &pos->member != (head);	\
+	     pos = list_entry(pos->member.next, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @pos:	the type * to use as a loop cursor.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_for_each_entry_safe(pos, n, head, member)			\
+	for (pos = list_entry((head)->next, typeof(*pos), member),	\
+		n = list_entry(pos->member.next, typeof(*pos), member);	\
+	     &pos->member != (head); 					\
+	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+/**
+ * list_for_each_entry_safe_continue
+ * @pos:	the type * to use as a loop cursor.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Iterate over list of given type, continuing after current point,
+ * safe against removal of list entry.
+ */
+#define list_for_each_entry_safe_continue(pos, n, head, member) 		\
+	for (pos = list_entry(pos->member.next, typeof(*pos), member), 		\
+		n = list_entry(pos->member.next, typeof(*pos), member);		\
+	     &pos->member != (head);						\
+	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+/**
+ * list_for_each_entry_safe_from
+ * @pos:	the type * to use as a loop cursor.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Iterate over list of given type from current point, safe against
+ * removal of list entry.
+ */
+#define list_for_each_entry_safe_from(pos, n, head, member) 			\
+	for (n = list_entry(pos->member.next, typeof(*pos), member);		\
+	     &pos->member != (head);						\
+	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+/**
+ * list_for_each_entry_safe_reverse
+ * @pos:	the type * to use as a loop cursor.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_struct within the struct.
+ *
+ * Iterate backwards over list of given type, safe against removal
+ * of list entry.
+ */
+#define list_for_each_entry_safe_reverse(pos, n, head, member)		\
+	for (pos = list_entry((head)->prev, typeof(*pos), member),	\
+		n = list_entry(pos->member.prev, typeof(*pos), member);	\
+	     &pos->member != (head); 					\
+	     pos = n, n = list_entry(n->member.prev, typeof(*n), member))
+
+/*
+ * Double linked lists with a single pointer list head.
+ * Mostly useful for hash tables where the two pointer list head is
+ * too wasteful.
+ * You lose the ability to access the tail in O(1).
+ */
+
+struct hlist_head {
+	struct hlist_node *first;
+};
+
+struct hlist_node {
+	struct hlist_node *next, **pprev;
+};
+
+#define HLIST_HEAD_INIT { .first = NULL }
+#define HLIST_HEAD(name) struct hlist_head name = {  .first = NULL }
+#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
+static inline void INIT_HLIST_NODE(struct hlist_node *h)
+{
+	h->next = NULL;
+	h->pprev = NULL;
+}
+
+static inline int hlist_unhashed(const struct hlist_node *h)
+{
+	return !h->pprev;
+}
+
+static inline int hlist_empty(const struct hlist_head *h)
+{
+	return !h->first;
+}
+
+static inline void __hlist_del(struct hlist_node *n)
+{
+	struct hlist_node *next = n->next;
+	struct hlist_node **pprev = n->pprev;
+	*pprev = next;
+	if (next)
+		next->pprev = pprev;
+}
+
+static inline void hlist_del(struct hlist_node *n)
+{
+	__hlist_del(n);
+	n->next = NULL;
+	n->pprev = NULL;
+}
+
+static inline void hlist_del_init(struct hlist_node *n)
+{
+	if (!hlist_unhashed(n)) {
+		__hlist_del(n);
+		INIT_HLIST_NODE(n);
+	}
+}
+
+
+static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
+{
+	struct hlist_node *first = h->first;
+	n->next = first;
+	if (first)
+		first->pprev = &n->next;
+	h->first = n;
+	n->pprev = &h->first;
+}
+
+
+/* next must be != NULL */
+static inline void hlist_add_before(struct hlist_node *n,
+					struct hlist_node *next)
+{
+	n->pprev = next->pprev;
+	n->next = next;
+	next->pprev = &n->next;
+	*(n->pprev) = n;
+}
+
+static inline void hlist_add_after(struct hlist_node *n,
+					struct hlist_node *next)
+{
+	next->next = n->next;
+	n->next = next;
+	next->pprev = &n->next;
+
+	if(next->next)
+		next->next->pprev  = &next->next;
+}
+
+#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
+
+#define hlist_for_each(pos, head) \
+	for (pos = (head)->first; pos; pos = pos->next)
+
+#define hlist_for_each_safe(pos, n, head) \
+	for (pos = (head)->first; pos; pos = n)
+
+/**
+ * hlist_for_each_entry	- iterate over list of given type
+ * @tpos:	the type * to use as a loop cursor.
+ * @pos:	the &struct hlist_node to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry(tpos, pos, head, member)			 \
+	for (pos = (head)->first; pos &&				 \
+		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+	     pos = pos->next)
+
+/**
+ * hlist_for_each_entry_continue - iterate over a hlist continuing after current point
+ * @tpos:	the type * to use as a loop cursor.
+ * @pos:	the &struct hlist_node to use as a loop cursor.
+ * @member:	the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_continue(tpos, pos, member)		\
+	for (pos = (pos)->next; pos &&					\
+	     ({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;});   \
+	     pos = pos->next)
+
+/**
+ * hlist_for_each_entry_from - iterate over a hlist continuing from current point
+ * @tpos:	the type * to use as a loop cursor.
+ * @pos:	the &struct hlist_node to use as a loop cursor.
+ * @member:	the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_from(tpos, pos, member)			 \
+	for (; pos &&			 \
+		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+	     pos = pos->next)
+
+/**
+ * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @tpos:	the type * to use as a loop cursor.
+ * @pos:	the &struct hlist_node to use as a loop cursor.
+ * @n:		another &struct hlist_node to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the hlist_node within the struct.
+ */
+#define hlist_for_each_entry_safe(tpos, pos, n, head, member) 		 \
+	for (pos = (head)->first;					 \
+	     pos && ({ n = pos->next; 1; }) && 				 \
+		({ tpos = hlist_entry(pos, typeof(*tpos), member); 1;}); \
+	     pos = n)
+
+#endif
diff --git a/ucimap-example.c b/ucimap-example.c
new file mode 100644
index 0000000..4309a76
--- /dev/null
+++ b/ucimap-example.c
@@ -0,0 +1,117 @@
+/*
+ * ucimap-example - sample code for the ucimap library
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation
+ *
+ * This program 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.
+ */
+#include <strings.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <ucimap.h>
+
+struct uci_network {
+	struct list_head list;
+
+	const char *name;
+	const char *proto;
+	const char *ifname;
+	const char *ipaddr;
+	int test;
+	bool enabled;
+};
+
+static int
+network_init_section(struct uci_map *map, void *section, struct uci_section *s)
+{
+	struct uci_network *net = section;
+
+	INIT_LIST_HEAD(&net->list);
+	net->name = s->e.name;
+	net->test = -1;
+	return 0;
+}
+
+static int
+network_add_section(struct uci_map *map, void *section)
+{
+	struct uci_network *net = section;
+	struct uci_network **nptr = map->priv;
+
+	*nptr = net;
+	return 0;
+}
+
+struct uci_optmap network_smap_options[] = {
+	OPTMAP_OPTION(UCIMAP_STRING, struct uci_network, proto, .data.s.maxlen = 32),
+	OPTMAP_OPTION(UCIMAP_STRING, struct uci_network, ifname),
+	OPTMAP_OPTION(UCIMAP_STRING, struct uci_network, ipaddr),
+	OPTMAP_OPTION(UCIMAP_BOOL, struct uci_network, enabled),
+	OPTMAP_OPTION(UCIMAP_INT, struct uci_network, test),
+};
+
+struct uci_sectmap network_smap[] = {
+	{
+		.type = "interface",
+		.options = network_smap_options,
+		.alloc_len = sizeof(struct uci_network),
+		.init_section = network_init_section,
+		.add_section = network_add_section,
+		.n_options = ARRAY_SIZE(network_smap_options),
+	}
+};
+
+struct uci_map network_map = {
+	.sections = network_smap,
+	.n_sections = ARRAY_SIZE(network_smap),
+};
+
+
+int main(int argc, char **argv)
+{
+	struct uci_context *ctx;
+	struct uci_package *pkg;
+	struct uci_network *net = NULL;
+
+	ctx = uci_alloc_context();
+	ucimap_init(&network_map);
+
+	uci_load(ctx, "network", &pkg);
+
+	network_map.priv = &net;
+	ucimap_parse(&network_map, pkg);
+
+	if (!net)
+		goto done;
+
+	printf("New network section '%s'\n"
+			"	type: %s\n"
+			"	ifname: %s\n"
+			"	ipaddr: %s\n"
+			"	test: %d\n"
+			"	enabled: %s\n",
+			net->name,
+			net->proto,
+			net->ifname,
+			net->ipaddr,
+			net->test,
+			(net->enabled ? "on" : "off"));
+
+	net->ipaddr = "2.3.4.5";
+	ucimap_set_changed(net, &net->ipaddr);
+	ucimap_store_section(&network_map, pkg, net);
+	uci_save(ctx, pkg);
+
+done:
+	ucimap_cleanup(&network_map);
+	uci_free_context(ctx);
+
+	return 0;
+}
diff --git a/ucimap.c b/ucimap.c
new file mode 100644
index 0000000..3c5fb31
--- /dev/null
+++ b/ucimap.c
@@ -0,0 +1,290 @@
+/*
+ * ucimap - library for mapping uci sections into data structures
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation
+ *
+ * This program 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.
+ */
+#include <strings.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "ucimap.h"
+
+
+int
+ucimap_init(struct uci_map *map)
+{
+	INIT_LIST_HEAD(&map->sdata);
+	return 0;
+}
+
+static void
+ucimap_free_section(struct uci_map *map, struct uci_sectmap_data *sd)
+{
+	void *section = sd;
+	int i;
+
+	section = (char *) section + sizeof(struct uci_sectmap_data);
+	if (!list_empty(&sd->list))
+		list_del(&sd->list);
+
+	if (sd->sm->free_section)
+		sd->sm->free_section(map, section);
+
+	for (i = 0; i < sd->allocmap_len; i++) {
+		free(sd->allocmap[i]);
+	}
+
+	free(sd->allocmap);
+	free(sd);
+}
+
+void
+ucimap_cleanup(struct uci_map *map)
+{
+	struct list_head *ptr, *tmp;
+
+	list_for_each_safe(ptr, tmp, &map->sdata) {
+		struct uci_sectmap_data *sd = list_entry(ptr, struct uci_sectmap_data, list);
+		ucimap_free_section(map, sd);
+	}
+}
+
+
+static int
+ucimap_parse_options(struct uci_map *map, struct uci_sectmap *sm, struct uci_sectmap_data *sd, struct uci_section *s)
+{
+	struct uci_element *e;
+	struct uci_option *o;
+	void *section = sd;
+	int i;
+
+	section = (unsigned char *) section + sizeof(struct uci_sectmap_data);
+	uci_foreach_element(&s->options, e) {
+		struct uci_optmap *om = NULL;
+
+		for (i = 0; i < sm->n_options; i++) {
+			if (strcmp(e->name, sm->options[i].name) == 0) {
+				om = &sm->options[i];
+				break;
+			}
+		}
+		if (!om)
+			goto next_element;
+
+		o = uci_to_option(e);
+		if(o->type != UCI_TYPE_STRING)
+			goto next_element;
+
+		switch(om->type) {
+		case UCIMAP_STRING: {
+			char **ptr;
+			if ((om->data.s.maxlen > 0) &&
+				(strlen(o->v.string) > om->data.s.maxlen))
+				goto next_element;
+
+			ptr = (char **) ((char *) section + om->offset);
+			*ptr = strdup(o->v.string);
+			sd->allocmap[sd->allocmap_len++] = *ptr;
+			} break;
+		case UCIMAP_BOOL: {
+			bool *ptr = (bool *)((char *)section + om->offset);
+			if (strcmp(o->v.string, "on"))
+				*ptr = true;
+			else if (strcmp(o->v.string, "1"))
+				*ptr = true;
+			else if (strcmp(o->v.string, "enabled"))
+				*ptr = true;
+			else
+				*ptr = false;
+			} break;
+		case UCIMAP_INT: {
+			int *ptr = (int *)((char *)section + om->offset);
+			char *eptr = NULL;
+			int val;
+
+			val = strtol(o->v.string, &eptr, om->data.i.base);
+			if (!eptr || *eptr == '\0')
+				*ptr = val;
+			} break;
+		}
+next_element:
+		continue;
+	}
+
+	return 0;
+}
+
+
+static int
+ucimap_parse_section(struct uci_map *map, struct uci_sectmap *sm, struct uci_section *s)
+{
+	struct uci_sectmap_data *sd = NULL;
+	void *section = NULL;
+	int err;
+
+	sd = malloc(sm->alloc_len + sizeof(struct uci_sectmap_data));
+	if (!sd)
+		return UCI_ERR_MEM;
+
+	memset(sd, 0, sm->alloc_len + sizeof(struct uci_sectmap_data));
+	INIT_LIST_HEAD(&sd->list);
+
+	sd->sm = sm;
+	sd->allocmap = malloc(sm->n_options * sizeof(void *));
+	if (!sd->allocmap)
+		goto error_mem;
+
+	sd->section_name = strdup(s->e.name);
+	if (!sd->section_name)
+		goto error_mem;
+
+	sd->cmap = malloc(BITFIELD_SIZE(sm->n_options));
+	if (!sd->cmap)
+		goto error_mem;
+
+	memset(sd->cmap, 0, BITFIELD_SIZE(sm->n_options));
+	sd->allocmap[sd->allocmap_len++] = (void *)sd->section_name;
+	sd->allocmap[sd->allocmap_len++] = (void *)sd->cmap;
+
+	section = (char *)sd + sizeof(struct uci_sectmap_data);
+
+	err = sm->init_section(map, section, s);
+	if (err)
+		goto error;
+
+	list_add(&sd->list, &map->sdata);
+	err = ucimap_parse_options(map, sm, sd, s);
+	if (err)
+		goto error;
+
+	err = sm->add_section(map, section);
+	if (err)
+		goto error;
+
+	return 0;
+
+error_mem:
+	if (sd->allocmap)
+		free(sd->allocmap);
+	free(sd);
+	return UCI_ERR_MEM;
+
+error:
+	ucimap_free_section(map, sd);
+	return err;
+}
+
+static int
+ucimap_fill_ptr(struct uci_ptr *ptr, struct uci_section *s, const char *option)
+{
+	struct uci_package *p = s->package;
+
+	memset(ptr, 0, sizeof(struct uci_ptr));
+
+	ptr->package = p->e.name;
+	ptr->p = p;
+
+	ptr->section = s->e.name;
+	ptr->s = s;
+
+	ptr->option = option;
+	return uci_lookup_ptr(p->ctx, ptr, NULL, false);
+}
+
+void
+ucimap_set_changed(void *section, void *field)
+{
+	char *sptr = (char *)section - sizeof(struct uci_sectmap_data);
+	struct uci_sectmap_data *sd = (struct uci_sectmap_data *) sptr;
+	struct uci_sectmap *sm = sd->sm;
+	int ofs = (char *)field - (char *)section;
+	int i;
+
+	for (i = 0; i < sm->n_options; i++) {
+		if (sm->options[i].offset == ofs) {
+			SET_BIT(sd->cmap, i);
+			break;
+		}
+	}
+}
+
+int
+ucimap_store_section(struct uci_map *map, struct uci_package *p, void *section)
+{
+	char *sptr = (char *)section - sizeof(struct uci_sectmap_data);
+	struct uci_sectmap_data *sd = (struct uci_sectmap_data *) sptr;
+	struct uci_sectmap *sm = sd->sm;
+	struct uci_section *s = NULL;
+	struct uci_element *e;
+	struct uci_ptr ptr;
+	int i, ret;
+
+	uci_foreach_element(&p->sections, e) {
+		if (!strcmp(e->name, sd->section_name)) {
+			s = uci_to_section(e);
+			break;
+		}
+	}
+	if (!s)
+		return UCI_ERR_NOTFOUND;
+
+	for (i = 0; i < sm->n_options; i++) {
+		struct uci_optmap *om = &sm->options[i];
+		static char buf[32];
+		const char *str = NULL;
+		void *p = (char *)section + om->offset;
+
+		if (!TEST_BIT(sd->cmap, i))
+			continue;
+
+		ucimap_fill_ptr(&ptr, s, om->name);
+		switch(om->type) {
+		case UCIMAP_STRING:
+			str = *((char **) p);
+			break;
+		case UCIMAP_INT:
+			sprintf(buf, "%d", *((int *) p));
+			str = buf;
+			break;
+		case UCIMAP_BOOL:
+			sprintf(buf, "%d", !!*((bool *)p));
+			str = buf;
+			break;
+		}
+		ptr.value = str;
+
+		ret = uci_set(s->package->ctx, &ptr);
+		if (ret)
+			return ret;
+
+		CLR_BIT(sd->cmap, i);
+	}
+
+	return 0;
+}
+
+
+void
+ucimap_parse(struct uci_map *map, struct uci_package *pkg)
+{
+	struct uci_element *e;
+	int i;
+
+	uci_foreach_element(&pkg->sections, e) {
+		struct uci_section *s = uci_to_section(e);
+
+		for (i = 0; i < map->n_sections; i++) {
+			if (strcmp(s->type, map->sections[i].type) != 0)
+				continue;
+			ucimap_parse_section(map, &map->sections[i], s);
+		}
+	}
+}
diff --git a/ucimap.h b/ucimap.h
new file mode 100644
index 0000000..0237fb1
--- /dev/null
+++ b/ucimap.h
@@ -0,0 +1,116 @@
+/*
+ * ucimap - library for mapping uci sections into data structures
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation
+ *
+ * This program 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.
+ */
+#include <stdbool.h>
+#include "uci_list.h"
+#include "uci.h"
+
+#ifndef ARRAY_SIZE
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+#endif
+
+#define BITFIELD_SIZE(_fields) (((_fields) / 8) + 1)
+
+#define CLR_BIT(_name, _bit) do { \
+	_name[(_bit) / 8] &= ~(1 << ((_bit) % 8)); \
+} while (0)
+
+#define SET_BIT(_name, _bit) do { \
+	_name[(_bit) / 8] |=  (1 << ((_bit) % 8)); \
+} while (0)
+
+#define TEST_BIT(_name, _bit) \
+	(_name[(_bit) / 8] & (1 << ((_bit) % 8)))
+
+#define OPTMAP_OPTION(_maptype, _type, _field, ...) \
+	{ \
+		.type = _maptype, \
+		.name = #_field, \
+		.offset = offsetof(_type, _field), \
+		__VA_ARGS__  \
+	}
+
+struct uci_sectmap;
+struct uci_optmap;
+
+struct uci_map {
+	struct uci_sectmap *sections;
+	unsigned int n_sections;
+	struct list_head sdata;
+
+	void *priv; /* user data */
+};
+
+enum ucimap_type {
+	UCIMAP_STRING,
+	UCIMAP_BOOL,
+	UCIMAP_INT,
+};
+
+/* ucimap internal */
+struct uci_sectmap_data {
+	struct list_head list;
+	struct uci_sectmap *sm;
+	const char *section_name;
+	unsigned long allocmap_len;
+
+	/* list of allocations done by ucimap */
+	void **allocmap;
+
+	/* map for changed fields */
+	unsigned char *cmap;
+};
+
+struct uci_sectmap {
+	/* type string for the uci section */
+	const char *type;
+
+	/* length of the struct to map into */
+	unsigned int alloc_len;
+
+	/* give the caller time to initialize the preallocated struct */
+	int (*init_section)(struct uci_map *map, void *section, struct uci_section *s);
+
+	/* pass the fully processed struct to the callback after the section end */
+	int (*add_section)(struct uci_map *map, void *section);
+
+	/* let the callback clean up its own stuff in the section */
+	int (*free_section)(struct uci_map *map, void *section);
+
+	/* list of option mappings for this section */
+	struct uci_optmap *options;
+	unsigned int n_options;
+};
+
+struct uci_optmap {
+	unsigned int offset;
+	const char *name;
+	enum ucimap_type type;
+	union {
+		struct {
+			int base;
+			int min;
+			int max;
+		} i;
+		struct {
+			int maxlen;
+		} s;
+	} data;
+};
+
+extern int ucimap_init(struct uci_map *map);
+extern void ucimap_cleanup(struct uci_map *map);
+extern void ucimap_set_changed(void *section, void *field);
+extern int ucimap_store_section(struct uci_map *map, struct uci_package *p, void *section);
+extern void ucimap_parse(struct uci_map *map, struct uci_package *pkg);
+