1  typedef __SIZE_TYPE__ size_t;
       2  
       3  extern void abort (void);
       4  extern int inside_main;
       5  
       6  __attribute__ ((__noinline__))
       7  size_t
       8  strnlen (const char *s, size_t n)
       9  {
      10    size_t i;
      11  
      12  #ifdef __OPTIMIZE__
      13    if (inside_main)
      14      abort ();
      15  #endif
      16  
      17    i = 0;
      18    while (s[i] != 0 && n--)
      19      i++;
      20  
      21    return i;
      22  }