#include

static char *olds;

#undef strtok

char *strtok (s, delim)

char *s;

const char *delim;

{

char *token;

if (s == NULL)

s = olds;

/* Scan leading delimiters. */

s += strspn (s, delim); //將指標移到第一個非delim中的字元的位置

if (*s == "\0")

{

olds = s;

return NULL;

}

olds = __rawmemchr (token, "\0");

else

{

/* Terminate the token and make OLDS point past it. */

*s = "\0";

olds = s + 1;

}

return token;

}