xref: /freebsd/lib/libc/stdbit/stdc_has_single_bit.c (revision 6296500a85c8474e3ff3fe2f8e4a9d56dd0acd64) 
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
stdc_has_single_bit_uc(unsigned char x)11 stdc_has_single_bit_uc(unsigned char x)
12 {
13 	return (x != 0 && (x & x - 1) == 0);
14 }
15 
16 bool
stdc_has_single_bit_us(unsigned short x)17 stdc_has_single_bit_us(unsigned short x)
18 {
19 	return (x != 0 && (x & x - 1) == 0);
20 }
21 
22 bool
stdc_has_single_bit_ui(unsigned int x)23 stdc_has_single_bit_ui(unsigned int x)
24 {
25 	return (x != 0 && (x & x - 1) == 0);
26 }
27 
28 bool
stdc_has_single_bit_ul(unsigned long x)29 stdc_has_single_bit_ul(unsigned long x)
30 {
31 	return (x != 0 && (x & x - 1) == 0);
32 }
33 
34 bool
stdc_has_single_bit_ull(unsigned long long x)35 stdc_has_single_bit_ull(unsigned long long x)
36 {
37 	return (x != 0 && (x & x - 1) == 0);
38 }
39