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#include <string.h> #include <stdint.h> #include <limits.h> #define ALIGN (sizeof(size_t)) #define ONES ((size_t)-1/UCHAR_MAX) #define HIGHS (ONES * (UCHAR_MAX/2+1)) #define HASZERO(x) ((x)-ONES & ~(x) & HIGHS) char *__stpcpy(char *restrict d, const char *restrict s) { #ifdef __GNUC__ typedef size_t __attribute__((__may_alias__)) word; word *wd; const word *ws; if ((uintptr_t)s % ALIGN == (uintptr_t)d % ALIGN) { for (; (uintptr_t)s % ALIGN; s++, d++) if (!(*d=*s)) return d; wd=(void *)d; ws=(const void *)s; for (; !HASZERO(*ws); *wd++ = *ws++); d=(void *)wd; s=(const void *)ws; } #endif for (; (*d=*s); s++, d++); return d; } weak_alias(__stpcpy, stpcpy); |