1*c9945492SAndroid Build Coastguard Worker #include <string.h> 2*c9945492SAndroid Build Coastguard Worker #include <stdint.h> 3*c9945492SAndroid Build Coastguard Worker #include <limits.h> 4*c9945492SAndroid Build Coastguard Worker 5*c9945492SAndroid Build Coastguard Worker #define ALIGN (sizeof(size_t)) 6*c9945492SAndroid Build Coastguard Worker #define ONES ((size_t)-1/UCHAR_MAX) 7*c9945492SAndroid Build Coastguard Worker #define HIGHS (ONES * (UCHAR_MAX/2+1)) 8*c9945492SAndroid Build Coastguard Worker #define HASZERO(x) ((x)-ONES & ~(x) & HIGHS) 9*c9945492SAndroid Build Coastguard Worker strlen(const char * s)10*c9945492SAndroid Build Coastguard Workersize_t strlen(const char *s) 11*c9945492SAndroid Build Coastguard Worker { 12*c9945492SAndroid Build Coastguard Worker const char *a = s; 13*c9945492SAndroid Build Coastguard Worker #ifdef __GNUC__ 14*c9945492SAndroid Build Coastguard Worker typedef size_t __attribute__((__may_alias__)) word; 15*c9945492SAndroid Build Coastguard Worker const word *w; 16*c9945492SAndroid Build Coastguard Worker for (; (uintptr_t)s % ALIGN; s++) if (!*s) return s-a; 17*c9945492SAndroid Build Coastguard Worker for (w = (const void *)s; !HASZERO(*w); w++); 18*c9945492SAndroid Build Coastguard Worker s = (const void *)w; 19*c9945492SAndroid Build Coastguard Worker #endif 20*c9945492SAndroid Build Coastguard Worker for (; *s; s++); 21*c9945492SAndroid Build Coastguard Worker return s-a; 22*c9945492SAndroid Build Coastguard Worker } 23