1 /* 2 * Copyright (c) 2025 Robert Clausecker <fuz@FreeBSD.org> 3 * 4 * SPDX-License-Identifier: BSD-2-Clause 5 */ 6 7 #include <stdbit.h> 8 #include <stdbool.h> 9 10 bool 11 stdc_has_single_bit_uc(unsigned char x) 12 { 13 return (x != 0 && (x & (x - 1)) == 0); 14 } 15 16 bool 17 stdc_has_single_bit_us(unsigned short x) 18 { 19 return (x != 0 && (x & (x - 1)) == 0); 20 } 21 22 bool 23 stdc_has_single_bit_ui(unsigned int x) 24 { 25 return (x != 0 && (x & (x - 1)) == 0); 26 } 27 28 bool 29 stdc_has_single_bit_ul(unsigned long x) 30 { 31 return (x != 0 && (x & (x - 1)) == 0); 32 } 33 34 bool 35 stdc_has_single_bit_ull(unsigned long long x) 36 { 37 return (x != 0 && (x & (x - 1)) == 0); 38 } 39