/* strtok function */
#include <string.h>

char *(strtok)(char *s1, const char *s2)
	{	/* find next token in s1[] delimited by s2[] */
	char *sbegin, *send;
	static char *ssave = "";	/* for safety */

	sbegin = s1 ? s1 : ssave;
	sbegin += strspn(sbegin, s2);
	if (*sbegin == '\0')
		{	/* end of scan */
		ssave = "";				/* for safety */
		return (NULL);
		}
	send = sbegin + strcspn(sbegin, s2);
	if (*send != '\0')
		*send++ = '\0';
	ssave = send;
	return (sbegin);
	}



