+ UCI_HANDLE_ERR(ctx);
+ uci_expand_ptr(ctx, ptr, false);
+ UCI_ASSERT(ctx, ptr->value);
+ UCI_ASSERT(ctx, ptr->s || (!ptr->option && ptr->section));
+ if (!ptr->option && ptr->value[0]) {
+ UCI_ASSERT(ctx, uci_validate_type(ptr->value));
+ }
+
+ if (!ptr->o && ptr->s && ptr->option) {
+ struct uci_element *e;
+ e = uci_lookup_list(&ptr->s->options, ptr->option);
+ if (e)
+ ptr->o = uci_to_option(e);
+ }
+ if (!ptr->value[0]) {
+ /* if setting a nonexistant option/section to a nonexistant value,
+ * exit without errors */
+ if (!(ptr->flags & UCI_LOOKUP_COMPLETE))
+ return 0;
+
+ return uci_delete(ctx, ptr);
+ } else if (!ptr->o && ptr->option) { /* new option */
+ ptr->o = uci_alloc_option(ptr->s, ptr->option, ptr->value, NULL);
+ } else if (!ptr->s && ptr->section) { /* new section */
+ ptr->s = uci_alloc_section(ptr->p, ptr->value, ptr->section, NULL);
+ } else if (ptr->o && ptr->option) { /* update option */
+ if (ptr->o->type == UCI_TYPE_STRING && !strcmp(ptr->o->v.string, ptr->value))
+ return 0;
+
+ if (ptr->o->type == UCI_TYPE_STRING && strlen(ptr->o->v.string) == strlen(ptr->value)) {
+ strcpy(ptr->o->v.string, ptr->value);
+ } else {
+ struct uci_option *old = ptr->o;
+ ptr->o = uci_alloc_option(ptr->s, ptr->option, ptr->value, &old->e.list);
+ if (ptr->option == old->e.name)
+ ptr->option = ptr->o->e.name;
+ uci_free_option(old);
+ }
+ } else if (ptr->s && ptr->section) { /* update section */
+ if (!strcmp(ptr->s->type, ptr->value))
+ return 0;
+
+ if (strlen(ptr->s->type) == strlen(ptr->value)) {
+ strcpy(ptr->s->type, ptr->value);
+ } else {
+ struct uci_section *old = ptr->s;
+ ptr->s = uci_alloc_section(ptr->p, ptr->value, old->e.name, &old->e.list);
+ uci_section_transfer_options(ptr->s, old);
+ if (ptr->section == old->e.name)
+ ptr->section = ptr->s->e.name;
+ uci_free_section(old);
+ ptr->s->package->n_section--;
+ }
+ } else {
+ UCI_THROW(ctx, UCI_ERR_INVAL);
+ }
+
+ if (!internal && ptr->p->has_delta)
+ uci_add_delta(ctx, &ptr->p->delta, UCI_CMD_CHANGE, ptr->section, ptr->option, ptr->value);