1 // SPDX-License-Identifier: BSD-2-Clause 2 /* 3 * Copyright (c) 2019, KAIST 4 */ 5 #include <ctype.h> 6 7 int __builtin_iscntrl(int c) 8 { 9 if (c < 0x20 || c == 0x7f) 10 return 1; 11 return 0; 12 } 13