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