1  extern void abort(void);
       2  extern int inside_main;
       3  
       4  __attribute__ ((__noinline__))
       5  void *
       6  memchr (const void *s, int c, __SIZE_TYPE__ n)
       7  {
       8    const unsigned char uc = c;
       9    const unsigned char *sp;
      10  
      11  #ifdef __OPTIMIZE__
      12    if (inside_main)
      13      abort ();
      14  #endif
      15  
      16    sp = s;
      17    for (; n != 0; ++sp, --n)
      18      if (*sp == uc)
      19        return (void *) sp;
      20  
      21    return 0;
      22  }