mconf/nconf: mark empty menus/menuconfigs different from non-empty ones

[carl9170fw.git] / config / menu.c

diff --git a/config/menu.c b/config/menu.c
index e98a05c8e50882d3b2833a2f4d05761dcffd22d3..7e233a6ca64ef7faf1bc9390ec89cb90ccef2d98 100644 (file)
--- a/config/menu.c
+++ b/config/menu.c
@@ -48,7 +48,7 @@ void menu_add_entry(struct symbol *sym)
 {
        struct menu *menu;
 
-       menu = malloc(sizeof(*menu));
+       menu = xmalloc(sizeof(*menu));
        memset(menu, 0, sizeof(*menu));
        menu->sym = sym;
        menu->parent = current_menu;
@@ -146,11 +146,24 @@ struct property *menu_add_prop(enum prop_type type, char *prompt, struct expr *e
                        struct menu *menu = current_entry;
 
                        while ((menu = menu->parent) != NULL) {
+                               struct expr *dup_expr;
+
                                if (!menu->visibility)
                                        continue;
+                               /*
+                                * Do not add a reference to the
+                                * menu's visibility expression but
+                                * use a copy of it.  Otherwise the
+                                * expression reduction functions
+                                * will modify expressions that have
+                                * multiple references which can
+                                * cause unwanted side effects.
+                                */
+                               dup_expr = expr_copy(menu->visibility);
+
                                prop->visible.expr
                                        = expr_alloc_and(prop->visible.expr,
-                                                        menu->visibility);
+                                                        dup_expr);
                        }
                }
 
@@ -430,6 +443,22 @@ bool menu_has_prompt(struct menu *menu)
        return true;
 }
 
+/*
+ * Determine if a menu is empty.
+ * A menu is considered empty if it contains no or only
+ * invisible entries.
+ */
+bool menu_is_empty(struct menu *menu)
+{
+       struct menu *child;
+
+       for (child = menu->list; child; child = child->next) {
+               if (menu_is_visible(child))
+                       return(false);
+       }
+       return(true);
+}
+
 bool menu_is_visible(struct menu *menu)
 {
        struct menu *child;
@@ -515,13 +544,6 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
        struct jump_key *jump;
 
        str_printf(r, _("Prompt: %s\n"), _(prop->text));
-       str_printf(r, _("  Defined at %s:%d\n"), prop->menu->file->name,
-               prop->menu->lineno);
-       if (!expr_is_yes(prop->visible.expr)) {
-               str_append(r, _("  Depends on: "));
-               expr_gstr_print(prop->visible.expr, r);
-               str_append(r, "\n");
-       }
        menu = prop->menu->parent;
        for (i = 0; menu != &rootmenu && i < 8; menu = menu->parent) {
                bool accessible = menu_is_visible(menu);
@@ -531,7 +553,7 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
                        location = menu;
        }
        if (head && location) {
-               jump = malloc(sizeof(struct jump_key));
+               jump = xmalloc(sizeof(struct jump_key));
 
                if (menu_is_visible(prop->menu)) {
                        /*
@@ -571,6 +593,18 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
        }
 }
 
+/*
+ * get peoperty of type P_SYMBOL
+ */
+static struct property *get_symbol_prop(struct symbol *sym)
+{
+       struct property *prop = NULL;
+
+       for_all_properties(sym, prop, P_SYMBOL)
+               break;
+       return prop;
+}
+
 /*
  * head is optional and may be NULL
  */
@@ -595,6 +629,18 @@ void get_symbol_str(struct gstr *r, struct symbol *sym,
        }
        for_all_prompts(sym, prop)
                get_prompt_str(r, prop, head);
+
+       prop = get_symbol_prop(sym);
+       if (prop) {
+               str_printf(r, _("  Defined at %s:%d\n"), prop->menu->file->name,
+                       prop->menu->lineno);
+               if (!expr_is_yes(prop->visible.expr)) {
+                       str_append(r, _("  Depends on: "));
+                       expr_gstr_print(prop->visible.expr, r);
+                       str_append(r, "\n");
+               }
+       }
+
        hit = false;
        for_all_properties(sym, prop, P_SELECT) {
                if (!hit) {