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extern void abort(void);

extern int inside_main;

typedef __SIZE_TYPE__ size_t;

char *

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

{

  char *dest = s1;

  char c = '\0';

#ifdef __OPTIMIZE__

  if (inside_main)

    abort();

#endif

  while (*s1) s1++;

  c = '\0';

  while (n > 0)

    {

      c = *s2++;

      *s1++ = c;

      if (c == '\0')

        return dest;

      n--;

    }

  if (c != '\0')

    *s1 = '\0';

  return dest;

}