/* in order to support named params, which Firebird itself doesn't,
	   we need to replace :foo by ?, and store the name we just replaced */

	new_sql = c = emalloc(sql_len+1);

	for (l = in_quote = in_param = 0; l <= sql_len; ++l) {
		if (!(in_quote ^= (sql[l] == '\''))) {
			if (!in_param) {
				switch (sql[l]) {
					case ':':
						in_param = 1;
						ppname = pname;
						*ppname++ = sql[l];
					case '?':
						*c++ = '?';
						++pindex;
					continue;
				}
			} else {
				if ((in_param &= ((sql[l] >= 'A' && sql[l] <= 'Z') || (sql[l] >= 'a' && sql[l] <= 'z')
					|| (sql[l] >= '0' && sql[l] <= '9') || sql[l] == '_' || sql[l] == '-'))) {
					*ppname++ = sql[l];
					continue;
				} else {
					*ppname++ = 0;
					if (named_params) {
						zval tmp;
						ZVAL_LONG(&tmp, pindex);
						zend_hash_str_update(named_params, pname, (unsigned int)(ppname - pname - 1), &tmp);
					}
				}
			}
		}
		*c++ = sql[l];
	}