1  extern void abort (void);
       2  extern int inside_main;
       3  
       4  __attribute__ ((__noinline__))
       5  __SIZE_TYPE__
       6  strcspn (const char *s1, const char *s2)
       7  {
       8    const char *p, *q;
       9  
      10  #ifdef __OPTIMIZE__
      11    if (inside_main)
      12      abort();
      13  #endif
      14  
      15    for (p = s1; *p; p++)
      16      for (q = s2; *q; q++)
      17        if (*p == *q)
      18  	goto found;
      19  
      20   found:
      21    return p - s1;
      22  }