Add copy control and in particular, destructor to the macro context

The macro contexts being static structs, they get their destructor
automatically called at program end. Which counter-intuitively *causes*
a leak if macros are stored in an STL container and rpmFreeMacros()
isn't called, because then the container clears itself and the macros
are left dangling, whereas without the destructor they are still
reachable. freeMacros() obviously wants to be a member function but
trying to keep things in the struct land for now.

Doesn't really change anything as of now, but this is needed for moving
the macro storage to C++ container.

rpmio/macro.c

@@ -69,8 +69,14 @@ struct rpmMacroContext_s {
  int level; /*!< Scope level tracking when on external recursion */
  pthread_mutex_t lock;
  pthread_mutexattr_t lockattr;
-};
 
+ rpmMacroContext_s() = default;
+ rpmMacroContext_s(const rpmMacroContext_s &other) = delete;
+ rpmMacroContext_s(const rpmMacroContext_s &&other) = delete;
+ rpmMacroContext_s &operator =(const rpmMacroContext_s & other) = delete;
+ rpmMacroContext_s &operator =(const rpmMacroContext_s && other) = delete;
+ ~rpmMacroContext_s();
+};
 
 static struct rpmMacroContext_s rpmGlobalMacroContext_s;
 rpmMacroContext rpmGlobalMacroContext = &rpmGlobalMacroContext_s;
@@ -144,6 +150,20 @@ static rpmMacroEntry popMacro(rpmMacroContext mc, const char * n);
 static int loadMacroFile(rpmMacroContext mc, const char * fn);
 /* =============================================================== */
 
+static void freeMacros(rpmMacroContext mc)
+{
+ while (mc->n > 0) {
+ /* remove from the end to avoid memmove */
+ rpmMacroEntry me = mc->tab[mc->n - 1];
+ while ((me = popMacro(mc, me->name))) {}
+ }
+}
+
+rpmMacroContext_s::~rpmMacroContext_s()
+{
+ freeMacros(this);
+}
+
 static rpmMacroContext rpmmctxAcquire(rpmMacroContext mc)
 {
  if (mc == NULL)
@@ -2189,11 +2209,7 @@ void
 rpmFreeMacros(rpmMacroContext mc)
 {
  mc = rpmmctxAcquire(mc);
- while (mc->n > 0) {
- /* remove from the end to avoid memmove */
- rpmMacroEntry me = mc->tab[mc->n - 1];
- popMacro(mc, me->name);
- }
+ freeMacros(mc);
  rpmmctxRelease(mc);
 }