Function SyncVariables

src/bin/psql/command.c:3669–3705

* SyncVariables * * Make psql's internal variables agree with connection state upon * establishing a new connection. */

 * establishing a new connection.
 */
void
SyncVariables(void)
{
	char		vbuf[32];
	const char *server_version;

	/* get stuff from connection */
	pset.encoding = PQclientEncoding(pset.db);
	pset.popt.topt.encoding = pset.encoding;
	pset.sversion = PQserverVersion(pset.db);

	setFmtEncoding(pset.encoding);

	SetVariable(pset.vars, "DBNAME", PQdb(pset.db));
	SetVariable(pset.vars, "USER", PQuser(pset.db));
	SetVariable(pset.vars, "HOST", PQhost(pset.db));
	SetVariable(pset.vars, "PORT", PQport(pset.db));
	SetVariable(pset.vars, "ENCODING", pg_encoding_to_char(pset.encoding));

	/* this bit should match connection_warnings(): */
	/* Try to get full text form of version, might include "devel" etc */
	server_version = PQparameterStatus(pset.db, "server_version");
	/* Otherwise fall back on pset.sversion */
	if (!server_version)
	{
		formatPGVersionNumber(pset.sversion, true, vbuf, sizeof(vbuf));
		server_version = vbuf;
	}
	SetVariable(pset.vars, "SERVER_VERSION_NAME", server_version);

	snprintf(vbuf, sizeof(vbuf), "%d", pset.sversion);
	SetVariable(pset.vars, "SERVER_VERSION_NUM", vbuf);

	/* send stuff to it, too */
	PQsetErrorVerbosity(pset.db, pset.verbosity);
	PQsetErrorContextVisibility(pset.db, pset.show_context);
}

/*
 * UnsyncVariables