add uci_lookup function

[project/uci.git] / list.c

diff --git a/list.c b/list.c
index 357b2e4..72d2eff 100644 (file)
--- a/list.c
+++ b/list.c
@@ -51,13 +51,14 @@ static inline void uci_list_del(struct uci_list *ptr)
 }
 
 static struct uci_element *
-uci_alloc_generic(struct uci_context *ctx, const char *name, int size)
+uci_alloc_generic(struct uci_context *ctx, int type, const char *name, int size)
 {
        struct uci_element *e;
        void *ptr;
 
        ptr = uci_malloc(ctx, size + strlen(name) + 1);
        e = (struct uci_element *) ptr;
+       e->type = type;
        e->name = (char *) ptr + size;
        strcpy(e->name, name);
        uci_list_init(&e->list);
@@ -156,6 +157,44 @@ uci_free_package(struct uci_package *p)
        uci_free_element(&p->e);
 }
 
+static struct uci_element *uci_lookup_list(struct uci_context *ctx, struct uci_list *list, char *name)
+{
+       struct uci_element *e;
+
+       uci_foreach_element(list, e) {
+               if (!strcmp(e->name, name))
+                       return e;
+       }
+       UCI_THROW(ctx, UCI_ERR_NOTFOUND);
+}
+
+int uci_lookup(struct uci_context *ctx, struct uci_element **res, char *package, char *section, char *option)
+{
+       struct uci_element *e;
+       struct uci_package *p;
+       struct uci_section *s;
+       struct uci_option *o;
+
+       UCI_HANDLE_ERR(ctx);
+       UCI_ASSERT(ctx, res != NULL);
+       UCI_ASSERT(ctx, package != NULL);
+
+       e = uci_lookup_list(ctx, &ctx->root, package);
+       if (!section)
+               goto found;
+
+       p = uci_to_package(e);
+       e = uci_lookup_list(ctx, &p->sections, section);
+       if (!option)
+               goto found;
+
+       s = uci_to_section(e);
+       e = uci_lookup_list(ctx, &s->options, option);
+
+found:
+       *res = e;
+       return 0;
+}
 
 int uci_unload(struct uci_context *ctx, const char *name)
 {