Function CopyTriggerDesc

src/backend/commands/trigger.c:1963–2013

* Copy a TriggerDesc data structure. * * The copy is allocated in the current memory context. */

 * The copy is allocated in the current memory context.
 */
TriggerDesc *
CopyTriggerDesc(TriggerDesc *trigdesc)
{
	TriggerDesc *newdesc;
	Trigger    *trigger;
	int			i;

	if (trigdesc == NULL || trigdesc->numtriggers <= 0)
		return NULL;

	newdesc = (TriggerDesc *) palloc(sizeof(TriggerDesc));
	memcpy(newdesc, trigdesc, sizeof(TriggerDesc));

	trigger = (Trigger *) palloc(trigdesc->numtriggers * sizeof(Trigger));
	memcpy(trigger, trigdesc->triggers,
		   trigdesc->numtriggers * sizeof(Trigger));
	newdesc->triggers = trigger;

	for (i = 0; i < trigdesc->numtriggers; i++)
	{
		trigger->tgname = pstrdup(trigger->tgname);
		if (trigger->tgnattr > 0)
		{
			int16	   *newattr;

			newattr = (int16 *) palloc(trigger->tgnattr * sizeof(int16));
			memcpy(newattr, trigger->tgattr,
				   trigger->tgnattr * sizeof(int16));
			trigger->tgattr = newattr;
		}
		if (trigger->tgnargs > 0)
		{
			char	  **newargs;
			int16		j;

			newargs = (char **) palloc(trigger->tgnargs * sizeof(char *));
			for (j = 0; j < trigger->tgnargs; j++)
				newargs[j] = pstrdup(trigger->tgargs[j]);
			trigger->tgargs = newargs;
		}
		if (trigger->tgqual)
			trigger->tgqual = pstrdup(trigger->tgqual);
		if (trigger->tgoldtable)
			trigger->tgoldtable = pstrdup(trigger->tgoldtable);
		if (trigger->tgnewtable)
			trigger->tgnewtable = pstrdup(trigger->tgnewtable);
		trigger++;
	}

	return newdesc;
}

/*
 * Free a TriggerDesc data structure.