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extern void abort (void);

extern int inside_main;

typedef __SIZE_TYPE__ size_t;

int

strncmp(const char *s1, const char *s2, size_t n)

{

  const unsigned char *u1 = (const unsigned char *)s1;

  const unsigned char *u2 = (const unsigned char *)s2;

  unsigned char c1, c2;

#ifdef __OPTIMIZE__

  if (inside_main)

    abort();

#endif

  while (n > 0)

    {

      c1 = *u1++, c2 = *u2++;

      if (c1 == '\0' || c1 != c2)

        return c1 - c2;

      n--;

    }

  return c1 - c2;

}