ref: de505b2650948c2f4ada5368eaf8a019cf1099bc
dir: /lib/c/strspn.c/
#include <string.h>
#undef strspn
size_t
strspn(const char *s1, const char *s2)
{
size_t n;
int c;
const char *p;
for (n = 0; c = *s1++; ++n) {
for (p = s2; *p && *p != c; ++p)
;
if (*p == '\0')
break;
}
return n;
}