#include <stdio.h>
#include <string.h>

enum { MAXPREC = -1 };

const char s[] = "";

int
main(void)
{
	int prec = -1;

	const char *sptr0 = (const char *)memchr(s, 0, (size_t)prec);
	printf("prec=%d (size_t)prec=%zu %p %p %p %p\n", prec, (size_t)prec, s, (const char *)memchr(s, 0, (size_t)-1), (const char *)memchr(s, 0, (size_t)prec), sptr0);

	for (prec = -1; prec <= MAXPREC; prec++) {
		printf("%zu ", strnlen(s, (size_t)prec));

		const char *sptr = (const char *)memchr(s, 0, (size_t)prec);
		printf("prec=%d (size_t)prec=%zu %p %p %p %p\n", prec, (size_t)prec, s, (const char *)memchr(s, 0, (size_t)-1), (const char *)memchr(s, 0, (size_t)prec), sptr);
		printf("(%p/%p) %zu\n", s, sptr, sptr ? sptr - s : (size_t)prec);
	}

	fflush(stdout);
	return ferror(stdout);
}