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Add repalloc0 and repalloc0_array

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These zero out the space added by repalloc.  This is a common pattern
that is quite hairy to code by hand.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/b66dfc89-9365-cb57-4e1f-b7d31813eeec@enterprisedb.com
This commit is contained in:
Peter Eisentraut
2022-11-12 20:31:27 +01:00
parent 30d98e14a8
commit b4b7ce8061
10 changed files with 48 additions and 71 deletions
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10
src/backend/parser/parse_param.c
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@ -145,14 +145,10 @@ variable_paramref_hook(ParseState *pstate, ParamRef *pref)
{
/* Need to enlarge param array */
if (*parstate->paramTypes)
*parstate->paramTypes = (Oid *) repalloc(*parstate->paramTypes,
paramno * sizeof(Oid));
*parstate->paramTypes = repalloc0_array(*parstate->paramTypes, Oid,
*parstate->numParams, paramno);
else
*parstate->paramTypes = (Oid *) palloc(paramno * sizeof(Oid));
/* Zero out the previously-unreferenced slots */
MemSet(*parstate->paramTypes + *parstate->numParams,
0,
(paramno - *parstate->numParams) * sizeof(Oid));
*parstate->paramTypes = palloc0_array(Oid, paramno);
*parstate->numParams = paramno;
}