Make instances of struct listbox_ops const.

src/bfu/hierbox.c

@@ -592,7 +592,7 @@ static const struct listbox_ops_messages default_listbox_ops_messages = {
 
 static void
 print_delete_error(struct listbox_item *item, struct terminal *term,
-		   struct listbox_ops *ops, enum delete_error err)
+		   const struct listbox_ops *ops, enum delete_error err)
 {
 	struct string msg;
 	unsigned char *errmsg;
@@ -647,7 +647,7 @@ static void
 do_delete_item(struct listbox_item *item, struct listbox_context *info,
 	       int last)
 {
-	struct listbox_ops *ops = info->box->ops;
+	const struct listbox_ops *ops = info->box->ops;
 
 	assert(item);
 
@@ -720,7 +720,7 @@ query_delete_selected_item(void *context_)
 	struct listbox_context *context, *oldcontext = context_;
 	struct terminal *term = oldcontext->term;
 	struct listbox_data *box = oldcontext->box;
-	struct listbox_ops *ops = box->ops;
+	const struct listbox_ops *ops = box->ops;
 	struct listbox_item *item = box->sel;
 	unsigned char *text;
 	enum delete_error delete;
@@ -779,7 +779,7 @@ push_hierbox_delete_button(struct dialog_data *dlg_data,
 	/* [gettext_accelerator_context(push_hierbox_delete_button)] */
 	struct terminal *term = dlg_data->win->term;
 	struct listbox_data *box = get_dlg_listbox_data(dlg_data);
-	struct listbox_ops *ops = box->ops;
+	const struct listbox_ops *ops = box->ops;
 	struct listbox_item *item = box->sel;
 	struct listbox_context *context;
 
@@ -842,7 +842,7 @@ push_hierbox_clear_button(struct dialog_data *dlg_data,
 {
 	/* [gettext_accelerator_context(push_hierbox_clear_button)] */
 	struct listbox_data *box = get_dlg_listbox_data(dlg_data);
-	struct listbox_ops *ops = box->ops;
+	const struct listbox_ops *ops = box->ops;
 	struct terminal *term = dlg_data->win->term;
 	struct listbox_context *context;
 

src/bfu/hierbox.h

@@ -24,7 +24,7 @@ struct hierbox_browser {
 	struct list_head boxes;
 	struct list_head dialogs;
 	struct listbox_item root;
-	struct listbox_ops *ops;
+	const struct listbox_ops *ops;
 
 	/* For saving state */
 	unsigned int do_not_save_state:1;

src/bfu/listbox.c

@@ -452,7 +452,7 @@ display_listbox_item(struct listbox_item *item, void *data_, int *offset)
 
 	} else {
 		unsigned char *text;
-		struct listbox_ops *ops = data->box->ops;
+		const struct listbox_ops *ops = data->box->ops;
 		int len_bytes;
 
 		assert(ops && ops->get_info);

src/bfu/listbox.h

@@ -100,7 +100,7 @@ struct listbox_ops {
 struct listbox_data {
 	LIST_HEAD(struct listbox_data);
 
-	struct listbox_ops *ops; /* Backend-provided operations */
+	const struct listbox_ops *ops; /* Backend-provided operations */
 	struct listbox_item *sel; /* Item currently selected */
 	struct listbox_item *top; /* Item which is on the top line of the box */
 

src/bookmarks/dialogs.c

@@ -139,7 +139,7 @@ static struct listbox_ops_messages bookmarks_messages = {
 	N_("Do you really want to remove all bookmarks?"),
 };
 
-static struct listbox_ops bookmarks_listbox_ops = {
+static const struct listbox_ops bookmarks_listbox_ops = {
 	lock_bookmark,
 	unlock_bookmark,
 	is_bookmark_used,

src/cache/dialogs.c

@@ -209,7 +209,7 @@ static struct listbox_ops_messages cache_messages = {
 	NULL,
 };
 
-static struct listbox_ops cache_entry_listbox_ops = {
+static const struct listbox_ops cache_entry_listbox_ops = {
 	lock_cache_entry,
 	unlock_cache_entry,
 	is_cache_entry_used,

src/config/dialogs.c

@@ -242,7 +242,7 @@ delete_option_item(struct listbox_item *item, int last)
 		mark_option_as_deleted(option);
 }
 
-static struct listbox_ops options_listbox_ops = {
+static const struct listbox_ops options_listbox_ops = {
 	lock_option,
 	unlock_option,
 	is_option_used,
@@ -727,7 +727,7 @@ delete_keybinding_item(struct listbox_item *item, int last)
 	free_keybinding(keybinding);
 }
 
-static struct listbox_ops keybinding_listbox_ops = {
+static const struct listbox_ops keybinding_listbox_ops = {
 	lock_keybinding,
 	unlock_keybinding,
 	is_keybinding_used,

src/cookies/dialogs.c

@@ -219,7 +219,7 @@ static struct listbox_ops_messages cookies_messages = {
 	N_("Do you really want to remove all cookies?"),
 };
 
-static struct listbox_ops cookies_listbox_ops = {
+static const struct listbox_ops cookies_listbox_ops = {
 	lock_cookie,
 	unlock_cookie,
 	is_cookie_used,

src/dialogs/download.c

@@ -445,7 +445,7 @@ static struct listbox_ops_messages download_messages = {
 	N_("Do you really want to interrupt all downloads?"),
 };
 
-static struct listbox_ops downloads_listbox_ops = {
+static const struct listbox_ops downloads_listbox_ops = {
 	lock_file_download,
 	unlock_file_download,
 	is_file_download_used,

src/formhist/dialogs.c

@@ -142,7 +142,7 @@ static struct listbox_ops_messages formhist_messages = {
 	N_("Do you really want to remove all forms?"),
 };
 
-static struct listbox_ops formhist_listbox_ops = {
+static const struct listbox_ops formhist_listbox_ops = {
 	lock_formhist_data,
 	unlock_formhist_data,
 	is_formhist_data_used,

src/globhist/dialogs.c

@@ -127,7 +127,7 @@ static struct listbox_ops_messages globhist_messages = {
 	N_("Do you really want to remove all history entries?"),
 };
 
-static struct listbox_ops gh_listbox_ops = {
+static const struct listbox_ops gh_listbox_ops = {
 	lock_globhist_item,
 	unlock_globhist_item,
 	is_globhist_item_used,

src/protocol/auth/dialogs.c

@@ -241,7 +241,7 @@ static struct listbox_ops_messages http_auth_messages = {
 	N_("Do you really want to remove all auth entries?"),
 };
 
-static struct listbox_ops auth_listbox_ops = {
+static const struct listbox_ops auth_listbox_ops = {
 	lock_auth_entry,
 	unlock_auth_entry,
 	is_auth_entry_used,