/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
#include <string.h>

size_t strspn(const char* s1, const char* s2)
{
    const char *p = s1, *spanp;
    char c, sc;

cont:
    c = *p++;
    for (spanp = s2; (sc = *spanp++) != 0;)
        if (sc == c)
            goto cont;
    return (p - 1 - s1);
}