++/* To allow timezone names to be used case-insensitively, find the
++ * canonical name for this timezone, if possible. */
++static const char *canonical_tzname(const char *timezone)
++{
++ if (timezonedb_system) {
++ timelib_tzdb_index_entry *ent, lookup;
++
++ lookup.id = (char *)timezone;
++
++ ent = bsearch(&lookup, timezonedb_system->index,
++ timezonedb_system->index_size, sizeof lookup,
++ sysdbcmp);
++ if (ent) {
++ return ent->id;
++ }
++ }
++
++ return timezone;
++}
++