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#include <string.h> #include <stdlib.h> #include <stdint.h> #define SS (sizeof(size_t)) #define ALIGN (sizeof(size_t)-1) #define ONES ((size_t)-1/UCHAR_MAX) void *memcpy(void *dest, const void *src, size_t n) { unsigned char *d = dest; const unsigned char *s = src; if (((uintptr_t)d & ALIGN) != ((uintptr_t)s & ALIGN)) goto misaligned; for (; ((uintptr_t)d & ALIGN) && n; n--) *d++ = *s++; if (n) { size_t *wd = (void *)d; const size_t *ws = (const void *)s; for (; n>=SS; n-=SS) *wd++ = *ws++; d = (void *)wd; s = (const void *)ws; misaligned: for (; n; n--) *d++ = *s++; } return dest; } |