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/*-------------------------------------------------------------------------
*
* params.c
* Support for finding the values associated with Param nodes.
*
*
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/nodes/params.c,v 1.8 2007/01/05 22:19:30 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "nodes/params.h"
#include "utils/datum.h"
#include "utils/lsyscache.h"
/*
* Copy a ParamListInfo structure.
*
* The result is allocated in CurrentMemoryContext.
*/
ParamListInfo
copyParamList(ParamListInfo from)
{
ParamListInfo retval;
Size size;
int i;
if (from == NULL || from->numParams <= 0)
return NULL;
/* sizeof(ParamListInfoData) includes the first array element */
size = sizeof(ParamListInfoData) +
(from->numParams - 1) *sizeof(ParamExternData);
retval = (ParamListInfo) palloc(size);
memcpy(retval, from, size);
/*
* Flat-copy is not good enough for pass-by-ref data values, so make a
* pass over the array to copy those.
*/
for (i = 0; i < retval->numParams; i++)
{
ParamExternData *prm = &retval->params[i];
int16 typLen;
bool typByVal;
if (prm->isnull || !OidIsValid(prm->ptype))
continue;
get_typlenbyval(prm->ptype, &typLen, &typByVal);
prm->value = datumCopy(prm->value, typByVal, typLen);
}
return retval;
}
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