reorganize some code, add an extra command for adding unnamed sections

[project/uci.git] / list.c

diff --git a/list.c b/list.c
index c6b7ebc..a28c5e1 100644 (file)
--- a/list.c
+++ b/list.c
@@ -115,6 +115,34 @@ uci_free_option(struct uci_option *o)
        uci_free_element(&o->e);
 }
 
+/* fix up an unnamed section, e.g. after adding options to it */
+static void uci_fixup_section(struct uci_context *ctx, struct uci_section *s)
+{
+       unsigned int hash = ~0;
+       struct uci_element *e;
+       char buf[16];
+
+       if (!s || s->e.name)
+               return;
+
+       /*
+        * Generate a name for unnamed sections. This is used as reference
+        * when locating or updating the section from apps/scripts.
+        * To make multiple concurrent versions somewhat safe for updating,
+        * the name is generated from a hash of its type and name/value
+        * pairs of its option, and it is prefixed by a counter value.
+        * If the order of the unnamed sections changes for some reason,
+        * updates to them will be rejected.
+        */
+       hash = djbhash(hash, s->type);
+       uci_foreach_element(&s->options, e) {
+               hash = djbhash(hash, e->name);
+               hash = djbhash(hash, uci_to_option(e)->value);
+       }
+       sprintf(buf, "cfg%02x%04x", ++s->package->n_section, hash % (1 << 16));
+       s->e.name = uci_strdup(ctx, buf);
+}
+
 static struct uci_section *
 uci_alloc_section(struct uci_package *p, const char *type, const char *name)
 {
@@ -131,6 +159,7 @@ uci_alloc_section(struct uci_package *p, const char *type, const char *name)
        strcpy(s->type, type);
        if (name == NULL)
                s->anonymous = true;
+       p->n_section++;
 
        uci_list_add(&p->sections, &s->e.list);
 
@@ -370,6 +399,19 @@ int uci_rename(struct uci_context *ctx, struct uci_package *p, char *section, ch
        return 0;
 }
 
+int uci_add_section(struct uci_context *ctx, struct uci_package *p, char *type, struct uci_section **res)
+{
+       struct uci_section *s;
+
+       UCI_HANDLE_ERR(ctx);
+       UCI_ASSERT(ctx, p != NULL);
+       s = uci_alloc_section(p, type, NULL);
+       uci_fixup_section(ctx, s);
+       *res = s;
+       uci_add_history(ctx, &p->history, UCI_CMD_ADD, s->e.name, NULL, type);
+
+       return 0;
+}
 
 int uci_delete(struct uci_context *ctx, struct uci_package *p, char *section, char *option)
 {
@@ -452,7 +494,7 @@ notfound:
 
        /* now add the missing entry */
        if (!internal && p->confdir)
-               uci_add_history(ctx, &p->history, UCI_CMD_ADD, section, option, value);
+               uci_add_history(ctx, &p->history, UCI_CMD_CHANGE, section, option, value);
        if (s) {
                o = uci_alloc_option(s, option, value);
                if (result)