#include <lib9.h> #define UCHAR_MAX	255#define uintptr_t	uintptr #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 *kstrchr(const char *s, int c){	size_t *w, k;	for (; (uintptr_t)s % ALIGN; s++)		if (!*s || *(unsigned char *)s == c) return (char *)s;	k = ONES * c;	for (w = (void *)s; !HASZERO(*w) && !HASZERO(*w^k); w++);	for (s = (void *)w; *s && *(unsigned char *)s != c; s++);	return (char *)s;}