gcc/testsuite/gcc.dg/cpp/20020927-1.c

   1 /* Test case for buffer overflow bug in token stringification.
   2    See PR preprocessor/8055 for details.
   3    Reported by Alexander N. Kabaev <ak03@gte.com>.
   4    Test case written by Zack Weinberg <zack@codesourcery.com>.  */
   5
   6 /* { dg-do preprocess } */
   7
   8 #define S(x) #x
   9
  10 /* Fill up one internal buffer with data.  */
  11 S(1234567890123456789012345678901234567890123456789012345678901234567890
  12   1234567890123456789012345678901234567890123456789012345678901234567890
  13   1234567890123456789012345678901234567890123456789012345678901234567890
  14   1234567890123456789012345678901234567890123456789012345678901234567890
  15   1234567890123456789012345678901234567890123456789012345678901234567890
  16   1234567890123456789012345678901234567890123456789012345678901234567890
  17   1234567890123456789012345678901234567890123456789012345678901234567890
  18   1234567890123456789012345678901234567890123456789012345678901234567890
  19   1234567890123456789012345678901234567890123456789012345678901234567890
  20   1234567890123456789012345678901234567890123456789012345678901234567890
  21   1234567890123456789012345678901234567890123456789012345678901234567890
  22   1234567890123456789012345678901234567890123456789012345678901234567890
  23   1234567890123456789012345678901234567890123456789012345678901234567890
  24   1234567890123456789012345678901234567890123456789012345678901234567890
  25   1234567890123456789012345678901234567890123456789012345678901234567890
  26   1234567890123456789012345678901234567890123456789012345678901234567890
  27   1234567890123456789012345678901234567890123456789012345678901234567890
  28   1234567890123456789012345678901234567890123456789012345678901234567890
  29   1234567890123456789012345678901234567890123456789012345678901234567890
  30   1234567890123456789012345678901234567890123456789012345678901234567890
  31   1234567890123456789012345678901234567890123456789012345678901234567890
  32   1234567890123456789012345678901234567890123456789012345678901234567890
  33   1234567890123456789012345678901234567890123456789012345678901234567890
  34   1234567890123456789012345678901234567890123456789012345678901234567890
  35   1234567890123456789012345678901234567890123456789012345678901234567890
  36   1234567890123456789012345678901234567890123456789012345678901234567890
  37   1234567890123456789012345678901234567890123456789012345678901234567890
  38   1234567890123456789012345678901234567890123456789012345678901234567890
  39   1234567890123456789012345678901234567890123456789012345678901234567890
  40   1234567890123456789012345678901234567890123456789012345678901234567890
  41   1234567890123456789012345678901234567890123456789012345678901234567890
  42   1234567890123456789012345678901234567890123456789012345678901234567890
  43   1234567890123456789012345678901234567890123456789012345678901234567890
  44   1234567890123456789012345678901234567890123456789012345678901234567890
  45   1234567890123456789012345678901234567890123456789012345678901234567890
  46   1234567890123456789012345678901234567890123456789012345678901234567890
  47   1234567890123456789012345678901234567890123456789012345678901234567890
  48   1234567890123456789012345678901234567890123456789012345678901234567890
  49   1234567890123456789012345678901234567890123456789012345678901234567890
  50   1234567890123456789012345678901234567890123456789012345678901234567890
  51   1234567890123456789012345678901234567890123456789012345678901234567890
  52   1234567890123456789012345678901234567890123456789012345678901234567890
  53   1234567890123456789012345678901234567890123456789012345678901234567890
  54   1234567890123456789012345678901234567890123456789012345678901234567890
  55   1234567890123456789012345678901234567890123456789012345678901234567890
  56   1234567890123456789012345678901234567890123456789012345678901234567890
  57   1234567890123456789012345678901234567890123456789012345678901234567890
  58   1234567890123456789012345678901234567890123456789012345678901234567890
  59   1234567890123456789012345678901234567890123456789012345678901234567890
  60   1234567890123456789012345678901234567890123456789012345678901234567890
  61   1234567890123456789012345678901234567890123456789012345678901234567890
  62   1234567890123456789012345678901234567890123456789012345678901234567890
  63   12345678901234567890123456789012345678901234567890123456789012345)
  64
  65 /* When stringify_arg() was called with an empty macro argument, it would
  66    advance the buffer pointer by one but fail to check for running past the
  67    end of the buffer.  We can only know where the end of the buffer is to
  68    within about eight bytes, so do this sixteen times to be sure of hitting
  69    it.  */
  70
  71 S()
  72 S()
  73 S()
  74 S()
  75 S()
  76 S()
  77 S()
  78 S()
  79 S()
  80 S()
  81 S()
  82 S()
  83 S()
  84 S()
  85 S()
  86 S()
  87
  88 /* Now allocate more memory in the buffer, which should provoke a crash.  */
  89
  90 S(abcdefghijklmnopqrstuvwxyz)
  91 S(abcdefghijklmnopqrstuvwxyz)