#include <stdio.h>
char *strsep(char **stringp, const char *delim)
{
char *s, *tok;
const char *spanp;
int c, sc;
s = *stringp;
if (!s)
return NULL;
tok = s;
do {
c = *s++;
spanp = delim;
do {
sc = *spanp++;
if (sc == c) {
if (c == 0)
s = NULL;
else
s[-1] = 0;
*stringp = s;
return tok;
}
} while (sc != 0);
} while (1);
}