ref: 1da7f45ae0e42aff174c695d948449bf22bf4b33
dir: /lib/c/strpbrk.c/
#include <string.h>
#undef strpbrk
char *
strpbrk(const char *s1, const char *s2)
{
int c;
const char *p;
for (; c = *s1; ++s1) {
for (p = s2; *p && *p != c; ++p)
;
if (*p == c)
return s1;
}
return NULL;
}