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Fix incorrect encoding-aware name truncation in makeArrayTypeName().

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truncate_identifier won't do anything if the passed-in strlen is already
less than NAMEDATALEN, which it always would be given the strlcpy usage.
This has been broken since the arrays-of-composite-types code went in.

Arguably truncate_identifier is suffering from excessive optimization
and should always process the string, but for the moment I'll take the
more localized patch.

Per bug #4987.
This commit is contained in:
Tom Lane 2009-08-16 18:14:39 +00:00
parent 08d1d61769
commit ef75f74f4c
1 changed files with 11 additions and 7 deletions
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18
src/backend/catalog/pg_type.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/catalog/pg_type.c,v 1.126 2009/06/11 14:48:55 momjian Exp $
* $PostgreSQL: pgsql/src/backend/catalog/pg_type.c,v 1.126.2.1 2009/08/16 18:14:39 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -686,23 +686,27 @@ RenameTypeInternal(Oid typeOid, const char *newTypeName, Oid typeNamespace)
char *
makeArrayTypeName(const char *typeName, Oid typeNamespace)
{
char *arr;
int i;
char *arr = (char *) palloc(NAMEDATALEN);
int namelen = strlen(typeName);
Relation pg_type_desc;
int i;
/*
* The idea is to prepend underscores as needed until we make a name that
* doesn't collide with anything...
*/
arr = palloc(NAMEDATALEN);
pg_type_desc = heap_open(TypeRelationId, AccessShareLock);
for (i = 1; i < NAMEDATALEN - 1; i++)
{
arr[i - 1] = '_';
strlcpy(arr + i, typeName, NAMEDATALEN - i);
truncate_identifier(arr, strlen(arr), false);
if (i + namelen < NAMEDATALEN)
strcpy(arr + i, typeName);
else
{
memcpy(arr + i, typeName, NAMEDATALEN - i);
truncate_identifier(arr, NAMEDATALEN, false);
}
if (!SearchSysCacheExists(TYPENAMENSP,
CStringGetDatum(arr),
ObjectIdGetDatum(typeNamespace),