Function read_connect_arg

src/bin/psql/command.c:2823–2853

* Read and interpret an argument to the \connect slash command. * * Returns a malloc'd string, or NULL if no/empty argument. */

 * Returns a malloc'd string, or NULL if no/empty argument.
 */
static char *
read_connect_arg(PsqlScanState scan_state)
{
	char	   *result;
	char		quote;

	/*
	 * Ideally we should treat the arguments as SQL identifiers.  But for
	 * backwards compatibility with 7.2 and older pg_dump files, we have to
	 * take unquoted arguments verbatim (don't downcase them). For now,
	 * double-quoted arguments may be stripped of double quotes (as if SQL
	 * identifiers).  By 7.4 or so, pg_dump files can be expected to
	 * double-quote all mixed-case \connect arguments, and then we can get rid
	 * of OT_SQLIDHACK.
	 */
	result = psql_scan_slash_option(scan_state, OT_SQLIDHACK, &quote, true);

	if (!result)
		return NULL;

	if (quote)
		return result;

	if (*result == '\0' || strcmp(result, "-") == 0)
	{
		free(result);
		return NULL;
	}

	return result;
}

/*
 * Read a boolean expression, return it as a PQExpBuffer string.