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Simplify calls to routerset_equal

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The routerset_equal function explicitly handles NULL inputs, so
there's no need to check inputs for NULL before calling it.

Also fix a bug in routerset_equal where a non-NULL routerset with no
entries didn't get counted as equal to a NULL routerset.  This was
untriggerable, I think, but potentially annoying down the road.
This commit is contained in:
Nick Mathewson 2011-04-03 19:13:36 -04:00
parent 84f0e87c6a
commit 128582cc1f
2 changed files with 12 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/or/config.c
View File

@ -1260,15 +1260,11 @@ options_act(or_options_t *old_options)
/* Check for transitions that need action. */
if (old_options) {
if ((options->UseEntryGuards && !old_options->UseEntryGuards) ||
(options->ExcludeNodes &&
!routerset_equal(old_options->ExcludeNodes,options->ExcludeNodes)) ||
(options->ExcludeExitNodes &&
!routerset_equal(old_options->ExcludeNodes,options->ExcludeNodes) ||
!routerset_equal(old_options->ExcludeExitNodes,
options->ExcludeExitNodes)) ||
(options->EntryNodes &&
!routerset_equal(old_options->EntryNodes, options->EntryNodes)) ||
(options->ExitNodes &&
!routerset_equal(old_options->ExitNodes, options->ExitNodes)) ||
options->ExcludeExitNodes) ||
!routerset_equal(old_options->EntryNodes, options->EntryNodes) ||
!routerset_equal(old_options->ExitNodes, options->ExitNodes) ||
options->StrictNodes != old_options->StrictNodes) {
log_info(LD_CIRC,
"Changed to using entry guards, or changed preferred or "

11
src/or/routerlist.c
View File

@ -5473,14 +5473,12 @@ routerset_needs_geoip(const routerset_t *set)
return set && smartlist_len(set->country_names);
}
#if 0
/** Return true iff there are no entries in <b>set</b>. */
static int
routerset_is_empty(const routerset_t *set)
{
return !set || smartlist_len(set->list) == 0;
}
#endif
/** Helper. Return true iff <b>set</b> contains a router based on the other
* provided fields. Return higher values for more specific subentries: a
@ -5659,10 +5657,15 @@ routerset_to_string(const routerset_t *set)
int
routerset_equal(const routerset_t *old, const routerset_t *new)
{
if (old == NULL && new == NULL)
if (routerset_is_empty(old) && routerset_is_empty(new)) {
/* Two empty sets are equal */
return 1;
else if (old == NULL || new == NULL)
} else if (routerset_is_empty(old) || routerset_is_empty(new)) {
/* An empty set is equal to nothing else. */
return 0;
}
tor_assert(old != NULL);
tor_assert(new != NULL);
if (smartlist_len(old->list) != smartlist_len(new->list))
return 0;