1  /* Copyright (C) 2002  Free Software Foundation.
       2  
       3     Test strcpy with various combinations of pointer alignments and lengths to
       4     make sure any optimizations in the library are correct.  */
       5  
       6  #include <string.h>
       7  
       8  #ifndef MAX_OFFSET
       9  #define MAX_OFFSET (sizeof (long long))
      10  #endif
      11  
      12  #ifndef MAX_COPY
      13  #define MAX_COPY (10 * sizeof (long long))
      14  #endif
      15  
      16  #ifndef MAX_EXTRA
      17  #define MAX_EXTRA (sizeof (long long))
      18  #endif
      19  
      20  #define MAX_LENGTH (MAX_OFFSET + MAX_COPY + 1 + MAX_EXTRA)
      21  
      22  /* Use a sequence length that is not divisible by two, to make it more
      23     likely to detect when words are mixed up.  */
      24  #define SEQUENCE_LENGTH 31
      25  
      26  static union {
      27    char buf[MAX_LENGTH];
      28    long long align_int;
      29    long double align_fp;
      30  } u1, u2;
      31  
      32  main ()
      33  {
      34    int off1, off2, len, i;
      35    char *p, *q, c;
      36  
      37    for (off1 = 0; off1 < MAX_OFFSET; off1++)
      38      for (off2 = 0; off2 < MAX_OFFSET; off2++)
      39        for (len = 1; len < MAX_COPY; len++)
      40  	{
      41  	  for (i = 0, c = 'A'; i < MAX_LENGTH; i++, c++)
      42  	    {
      43  	      u1.buf[i] = 'a';
      44  	      if (c >= 'A' + SEQUENCE_LENGTH)
      45  		c = 'A';
      46  	      u2.buf[i] = c;
      47  	    }
      48  	  u2.buf[off2 + len] = '\0';
      49  
      50  	  p = strcpy (u1.buf + off1, u2.buf + off2);
      51  	  if (p != u1.buf + off1)
      52  	    abort ();
      53  
      54  	  q = u1.buf;
      55  	  for (i = 0; i < off1; i++, q++)
      56  	    if (*q != 'a')
      57  	      abort ();
      58  
      59  	  for (i = 0, c = 'A' + off2; i < len; i++, q++, c++)
      60  	    {
      61  	      if (c >= 'A' + SEQUENCE_LENGTH)
      62  		c = 'A';
      63  	      if (*q != c)
      64  		abort ();
      65  	    }
      66  
      67  	  if (*q++ != '\0')
      68  	    abort ();
      69  	  for (i = 0; i < MAX_EXTRA; i++, q++)
      70  	    if (*q != 'a')
      71  	      abort ();
      72  	}
      73  
      74    exit (0);
      75  }