3 #define BITOP(a,b,op) \
4 ((a)[(size_t)(b)/(8*sizeof *(a))] op (size_t)1<<((size_t)(b)%(8*sizeof *(a))))
6 size_t strspn(const char *s
, const char *c
)
9 size_t byteset
[32/sizeof(size_t)] = { 0 };
13 for (; *s
== *c
; s
++);
17 for (; *c
&& BITOP(byteset
, *(unsigned char *)c
, |=); c
++);
18 for (; *s
&& BITOP(byteset
, *(unsigned char *)s
, &); s
++);