1#include <string.h>
 2
 3char *strtok_r(char *restrict s, const char *restrict sep, char **restrict p)
 4{
 5	if (!s && !(s = *p)) return NULL;
 6	s += strspn(s, sep);
 7	if (!*s) return *p = 0;
 8	*p = s + strcspn(s, sep);
 9	if (**p) *(*p)++ = 0;
10	else *p = 0;
11	return s;
12}