1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
static u32 util_popcount(u64 x) {
#ifdef __GNUC__
return (u32)__builtin_popcountll(x);
#else
u32 count = 0;
while (x) {
x &= x-1;
++count;
}
return count;
#endif
}
static bool util_is_power_of_2(u64 x) {
return util_popcount(x) == 1;
}
static void util_zero_memory(void *mem, size_t size) {
extern void *memset(void *s, int c, size_t n);
memset(mem, 0, size);
}
// for finding a character in a char32 string
static char32_t *util_mem32chr(char32_t *s, char32_t c, size_t n) {
for (size_t i = 0; i < n; ++i) {
if (s[i] == c) {
return &s[i];
}
}
return NULL;
}
static char32_t const *util_mem32chr_const(char32_t const *s, char32_t c, size_t n) {
for (size_t i = 0; i < n; ++i) {
if (s[i] == c) {
return &s[i];
}
}
return NULL;
}
static bool streq(char const *a, char const *b) {
return strcmp(a, b) == 0;
}
static bool util_is_prefix(char const *str, char const *prefix) {
return strncmp(str, prefix, strlen(prefix)) == 0;
}
|
