+int uci_lookup(struct uci_context *ctx, struct uci_element **res, struct uci_package *p, char *section, char *option)
+{
+ struct uci_element *e;
+ struct uci_section *s;
+ struct uci_option *o;
+
+ UCI_HANDLE_ERR(ctx);
+ UCI_ASSERT(ctx, res != NULL);
+ UCI_ASSERT(ctx, p != NULL);
+ UCI_ASSERT(ctx, section != NULL);
+
+ e = uci_lookup_list(ctx, &p->sections, section);
+ if (!e)
+ goto notfound;
+
+ if (option) {
+ s = uci_to_section(e);
+ e = uci_lookup_list(ctx, &s->options, option);
+ }
+
+ *res = e;
+ return 0;
+
+notfound:
+ UCI_THROW(ctx, UCI_ERR_NOTFOUND);
+ return 0;
+}
+
+int uci_del_element(struct uci_context *ctx, struct uci_element *e)
+{
+ /* NB: UCI_INTERNAL use means without history tracking */
+ bool internal = ctx->internal;
+ struct uci_package *p = NULL;
+ struct uci_section *s = NULL;
+ struct uci_option *o = NULL;
+ struct uci_element *i, *tmp;
+ char *option = NULL;
+
+ UCI_HANDLE_ERR(ctx);
+ UCI_ASSERT(ctx, e != NULL);
+
+ switch(e->type) {
+ case UCI_TYPE_SECTION:
+ s = uci_to_section(e);
+ uci_foreach_element_safe(&s->options, tmp, i) {
+ uci_del_element(ctx, i);
+ }
+ break;
+ case UCI_TYPE_OPTION:
+ o = uci_to_option(e);
+ s = o->section;
+ p = s->package;
+ option = e->name;
+ break;
+ default:
+ UCI_THROW(ctx, UCI_ERR_INVAL);
+ break;
+ }
+
+ p = s->package;
+ if (!internal)
+ uci_add_history(ctx, p, UCI_CMD_REMOVE, s->e.name, option, NULL);
+
+ switch(e->type) {
+ case UCI_TYPE_SECTION:
+ uci_free_section(s);
+ break;
+ case UCI_TYPE_OPTION:
+ uci_free_option(o);
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+int uci_set_element_value(struct uci_context *ctx, struct uci_element **element, char *value)
+{
+ /* NB: UCI_INTERNAL use means without history tracking */
+ bool internal = ctx->internal;
+ struct uci_list *list;
+ struct uci_element *e;
+ struct uci_package *p;
+ struct uci_section *s;
+ char *section;
+ char *option;
+ char *str;
+ int size;
+
+ UCI_HANDLE_ERR(ctx);
+ UCI_ASSERT(ctx, value != NULL);
+ UCI_ASSERT(ctx, element != NULL);
+ UCI_ASSERT(ctx, *element != NULL);
+
+ /* what the 'value' of an element means depends on the type
+ * for a section, the 'value' means its type
+ * for an option, the 'value' means its value string
+ * when changing the value, shrink the element to its actual size
+ * (it may have been allocated with a bigger size, to include
+ * its buffer)
+ * then duplicate the string passed on the command line and
+ * insert it into the structure.
+ */
+ e = *element;
+ list = e->list.prev;
+ switch(e->type) {
+ case UCI_TYPE_SECTION:
+ size = sizeof(struct uci_section);
+ s = uci_to_section(e);
+ section = e->name;
+ option = NULL;
+ break;
+ case UCI_TYPE_OPTION:
+ size = sizeof(struct uci_option);
+ s = uci_to_option(e)->section;
+ section = s->e.name;
+ option = e->name;
+ break;
+ default:
+ UCI_THROW(ctx, UCI_ERR_INVAL);
+ return 0;
+ }
+ p = s->package;
+ if (!internal)
+ uci_add_history(ctx, p, UCI_CMD_CHANGE, section, option, value);
+
+ uci_list_del(&e->list);
+ e = uci_realloc(ctx, e, size);
+ str = uci_strdup(ctx, value);
+ uci_list_insert(list, &e->list);
+ *element = e;
+
+ switch(e->type) {
+ case UCI_TYPE_SECTION:
+ uci_to_section(e)->type = str;
+ break;
+ case UCI_TYPE_OPTION:
+ uci_to_option(e)->value = str;
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+int uci_del(struct uci_context *ctx, struct uci_package *p, char *section, char *option)
+{
+ /* NB: pass on internal flag to uci_del_element */
+ bool internal = ctx->internal;
+ struct uci_element *e;
+ struct uci_section *s = NULL;
+ struct uci_option *o = NULL;
+
+ UCI_HANDLE_ERR(ctx);
+ UCI_ASSERT(ctx, p != NULL);
+ UCI_ASSERT(ctx, section != NULL);
+
+ UCI_INTERNAL(uci_lookup, ctx, &e, p, section, option);
+
+ if (!internal)
+ return uci_del_element(ctx, e);
+ UCI_INTERNAL(uci_del_element, ctx, e);
+
+ return 0;
+}
+
+int uci_set(struct uci_context *ctx, struct uci_package *p, char *section, char *option, char *value)
+{
+ /* NB: UCI_INTERNAL use means without history tracking */
+ bool internal = ctx->internal;
+ struct uci_element *e = NULL;
+ struct uci_section *s = NULL;
+ struct uci_option *o = NULL;
+ struct uci_history *h;
+
+ UCI_HANDLE_ERR(ctx);
+ UCI_ASSERT(ctx, p != NULL);
+ UCI_ASSERT(ctx, section != NULL);
+ UCI_ASSERT(ctx, value != NULL);
+
+ /*
+ * look up the package, section and option (if set)
+ * if the section/option is to be modified and it is not found
+ * create a new element in the appropriate list
+ */
+ e = uci_lookup_list(ctx, &p->sections, section);
+ if (!e)
+ goto notfound;
+
+ s = uci_to_section(e);
+ if (option) {
+ e = uci_lookup_list(ctx, &s->options, option);
+ if (!e)
+ goto notfound;
+ o = uci_to_option(e);
+ }
+
+ /*
+ * no unknown element was supplied, assume that we can just update
+ * an existing entry
+ */
+ if (o)
+ e = &o->e;
+ else
+ e = &s->e;
+
+ if (!internal)
+ return uci_set_element_value(ctx, &e, value);
+
+ UCI_INTERNAL(uci_set_element_value, ctx, &e, value);
+ return 0;
+
+notfound:
+ /*
+ * the entry that we need to update was not found,
+ * check if the search failed prematurely.
+ * this can happen if the package was not found, or if
+ * an option was supplied, but the section wasn't found
+ */
+ if (!p || (!s && option))
+ UCI_THROW(ctx, UCI_ERR_NOTFOUND);
+
+ /* now add the missing entry */
+ if (!internal)
+ uci_add_history(ctx, p, UCI_CMD_ADD, section, option, value);
+ if (s)
+ uci_alloc_option(s, option, value);
+ else
+ uci_alloc_section(p, value, section);
+
+ return 0;
+}
+
+int uci_unload(struct uci_context *ctx, struct uci_package *p)
+{
+ struct uci_element *e;
+
+ UCI_HANDLE_ERR(ctx);
+ UCI_ASSERT(ctx, p != NULL);
+
+ uci_free_package(&p);
+ return 0;
+}
+