blob: ca5a65a55ae236d5d8203c9ed6d77767706833ca (
plain) (
blame)
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
|
#include <string.h>
#define BITOP(a,b,op) \
((a)[(size_t)(b)/(8*sizeof *(a))] op (size_t)1<<((size_t)(b)%(8*sizeof *(a))))
size_t strspn(const char *s, const char *c)
{
const char *a = s;
size_t byteset[32/sizeof(size_t)] = { 0 };
if (!c[0]) return 0;
if (!c[1]) {
for (; *s == *c; s++);
return s-a;
}
for (; *c && BITOP(byteset, *(unsigned char *)c, |=); c++);
for (; *s && BITOP(byteset, *(unsigned char *)s, &); s++);
return s-a;
}
#ifdef TEST
int
main(void) {
return 0;
}
#endif
|
