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

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

    for (p = s1;;) {
        c = *p++;
        spanp = s2;
        do {
            if ((sc = *spanp++) == c)
                return p - 1 - s1;
        } while (sc != 0);
    }
}