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Extract the do-while loop in dns__zone_updatesigs() into a separate function

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The do-while loop in dns__zone_updatesigs() is hard to follow due to
heavy nesting and the 'tuple' variable also being used in the outer for
loop.  Add a comment to explain the purpose of the do-while loop.
Extract it into a separate function to decrease indentation and prevent
using 'tuple' in two different loops.
This commit is contained in:
Michał Kępień 2018-05-10 09:43:38 +02:00
parent 3c40aa004a
commit 31cdf770a4
1 changed files with 27 additions and 11 deletions
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38
lib/dns/zone.c
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@ -7288,6 +7288,25 @@ need_nsec_chain(dns_db_t *db, dns_dbversion_t *ver,
return (result);
}
/*%
* Remove all tuples with the same name and type as 'cur' from 'src' and append
* them to 'dst'.
*/
static void
move_matching_tuples(dns_difftuple_t *cur, dns_diff_t *src, dns_diff_t *dst) {
do {
dns_difftuple_t *next = ISC_LIST_NEXT(cur, link);
while (next != NULL &&
(cur->rdata.type != next->rdata.type ||
!dns_name_equal(&cur->name, &next->name)))
next = ISC_LIST_NEXT(next, link);
ISC_LIST_UNLINK(src->tuples, cur, link);
dns_diff_appendminimal(dst, &cur);
INSIST(cur == NULL);
cur = next;
} while (cur != NULL);
}
/*%
* Add/remove DNSSEC signatures for the list of "raw" zone changes supplied in
* 'diff'. Gradually remove tuples from 'diff' and append them to 'zonediff'
@ -7337,17 +7356,14 @@ dns__zone_updatesigs(dns_diff_t *diff, dns_db_t *db, dns_dbversion_t *version,
return (result);
}
do {
dns_difftuple_t *next = ISC_LIST_NEXT(tuple, link);
while (next != NULL &&
(tuple->rdata.type != next->rdata.type ||
!dns_name_equal(&tuple->name, &next->name)))
next = ISC_LIST_NEXT(next, link);
ISC_LIST_UNLINK(diff->tuples, tuple, link);
dns_diff_appendminimal(zonediff->diff, &tuple);
INSIST(tuple == NULL);
tuple = next;
} while (tuple != NULL);
/*
* Signature changes for all RRs with name tuple->name and type
* tuple->rdata.type were appended to zonediff->diff. Now we
* remove all the "raw" changes with the same name and type
* from diff (so that they are not processed by this loop
* again) and append them to zonediff so that they get applied.
*/
move_matching_tuples(tuple, diff, zonediff->diff);
}
return (ISC_R_SUCCESS);
}