1extern void abort (void);
2extern int inside_main;
3
4typedef __SIZE_TYPE__ size_t;
5
6__attribute__ ((__noinline__))
7int
8strncmp(const char *s1, const char *s2, size_t n)
9{
10  const unsigned char *u1 = (const unsigned char *)s1;
11  const unsigned char *u2 = (const unsigned char *)s2;
12  unsigned char c1, c2;
13
14#ifdef __OPTIMIZE__
15  if (inside_main)
16    abort();
17#endif
18
19  while (n > 0)
20    {
21      c1 = *u1++, c2 = *u2++;
22      if (c1 == '\0' || c1 != c2)
23	return c1 - c2;
24      n--;
25    }
26  return c1 - c2;
27}
28