#include <lib9.h> #define UCHAR_MAX	255#define uintptr_t	uintptr #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) void *memccpy(void *restrict dest, const void *restrict src, int c, size_t n){	unsigned char *d = dest;	const unsigned char *s = src;	size_t *wd, k;	const size_t *ws; 	c = (unsigned char)c;	if (((uintptr_t)s & ALIGN) == ((uintptr_t)d & ALIGN)) {		for (; ((uintptr_t)s & ALIGN) && n && (*d=*s)!=c; n--, s++, d++);		if ((uintptr_t)s & ALIGN) goto tail;		k = ONES * c;		wd=(void *)d; ws=(const void *)s;		for (; n>=sizeof(size_t) && !HASZERO(*ws^k);		       n-=sizeof(size_t), ws++, wd++) *wd = *ws;		d=(void *)wd; s=(const void *)ws;	}	for (; n && (*d=*s)!=c; n--, s++, d++);tail:	if (*s==c) return d+1;	return 0;}