#include <string.h>
char* strtok_r(char *str, const char *delim, char **nextp) {
	char *ret;
	if (str == NULL) {
		str = *nextp;
	}
	str += strspn(str, delim);
	if (*str == '\0') {
		return NULL;
	}
	ret = str;
	str += strcspn(str, delim);
	if (*str) {
		*str++ = '\0';
	}
	*nextp = str;
	return ret;
}