From 64894182ca52963db661ef52fc57b0cd55099f0d Mon Sep 17 00:00:00 2001
From: Thomas Haller <thaller@redhat.com>
Date: Mon, 6 Apr 2020 10:43:07 +0200
Subject: [PATCH] shared/strbuf: expose read only value for "allocated" buffer
 size

We cannot actually mark the field as const, because then you could no
longer initialize a variable that contains a NMStrBuf with designated
initializers.

We also want to keep the "_allocated" alias, for the only places that
are allowed to mutate the field: inside "nm-str-buf.h". Add an alias
for that field, that is allowed to be read, provided that you don't
modify it!

The alternative would be a nm_str_buf_get_allocated() accessor, but
that seems unnecessarily verbose when you could just access the field.
---
 shared/nm-glib-aux/nm-str-buf.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/shared/nm-glib-aux/nm-str-buf.h b/shared/nm-glib-aux/nm-str-buf.h
index 4c015aa43c..564f91c4b5 100644
--- a/shared/nm-glib-aux/nm-str-buf.h
+++ b/shared/nm-glib-aux/nm-str-buf.h
@@ -16,7 +16,10 @@ typedef struct _NMStrBuf {
 		/*const*/ gsize len;
 		gsize _len;
 	};
-	gsize _allocated;
+	union {
+		/*const*/ gsize allocated;
+		gsize _allocated;
+	};
 	bool _do_bzero_mem;
 } NMStrBuf;