gcc/testsuite/gcc.c-torture/execute/strlen-1.c

   1 /* Copyright (C) 2002  Free Software Foundation.
   2
   3    Test strlen with various combinations of pointer alignments and lengths to
   4    make sure any optimizations in the library are correct.
   5
   6    Written by Michael Meissner, March 9, 2002.  */
   7
   8 #include <string.h>
   9 #include <stddef.h>
  10
  11 #ifndef MAX_OFFSET
  12 #define MAX_OFFSET (sizeof (long long))
  13 #endif
  14
  15 #ifndef MAX_TEST
  16 #define MAX_TEST (8 * sizeof (long long))
  17 #endif
  18
  19 #ifndef MAX_EXTRA
  20 #define MAX_EXTRA (sizeof (long long))
  21 #endif
  22
  23 #define MAX_LENGTH (MAX_OFFSET + MAX_TEST + MAX_EXTRA + 1)
  24
  25 static union {
  26   char buf[MAX_LENGTH];
  27   long long align_int;
  28   long double align_fp;
  29 } u;
  30
  31 main ()
  32 {
  33   size_t off, len, len2, i;
  34   char *p;
  35
  36   for (off = 0; off < MAX_OFFSET; off++)
  37     for (len = 0; len < MAX_TEST; len++)
  38       {
  39         p = u.buf;
  40         for (i = 0; i < off; i++)
  41           *p++ = '\0';
  42
  43         for (i = 0; i < len; i++)
  44           *p++ = 'a';
  45
  46         *p++ = '\0';
  47         for (i = 0; i < MAX_EXTRA; i++)
  48           *p++ = 'b';
  49
  50         p = u.buf + off;
  51         len2 = strlen (p);
  52         if (len != len2)
  53           abort ();
  54       }
  55
  56   exit (0);
  57 }