1*c9945492SAndroid Build Coastguard Worker #include <string.h> 2*c9945492SAndroid Build Coastguard Worker 3*c9945492SAndroid Build Coastguard Worker #define BITOP(a,b,op) \ 4*c9945492SAndroid Build Coastguard Worker ((a)[(size_t)(b)/(8*sizeof *(a))] op (size_t)1<<((size_t)(b)%(8*sizeof *(a)))) 5*c9945492SAndroid Build Coastguard Worker strspn(const char * s,const char * c)6*c9945492SAndroid Build Coastguard Workersize_t strspn(const char *s, const char *c) 7*c9945492SAndroid Build Coastguard Worker { 8*c9945492SAndroid Build Coastguard Worker const char *a = s; 9*c9945492SAndroid Build Coastguard Worker size_t byteset[32/sizeof(size_t)] = { 0 }; 10*c9945492SAndroid Build Coastguard Worker 11*c9945492SAndroid Build Coastguard Worker if (!c[0]) return 0; 12*c9945492SAndroid Build Coastguard Worker if (!c[1]) { 13*c9945492SAndroid Build Coastguard Worker for (; *s == *c; s++); 14*c9945492SAndroid Build Coastguard Worker return s-a; 15*c9945492SAndroid Build Coastguard Worker } 16*c9945492SAndroid Build Coastguard Worker 17*c9945492SAndroid Build Coastguard Worker for (; *c && BITOP(byteset, *(unsigned char *)c, |=); c++); 18*c9945492SAndroid Build Coastguard Worker for (; *s && BITOP(byteset, *(unsigned char *)s, &); s++); 19*c9945492SAndroid Build Coastguard Worker return s-a; 20*c9945492SAndroid Build Coastguard Worker } 21