libio/bug-rewind.c

   1 #include <stdio.h>
   2 #include <wchar.h>
   3
   4 #define PASSED  0
   5 #define FAILED  3
   6
   7
   8 static int fd;
   9
  10 static void prepare (void);
  11 #define PREPARE(argc, argv) prepare ()
  12
  13
  14 #define TEST_FUNCTION do_test ()
  15 static int do_test (void);
  16 #include "../test-skeleton.c"
  17
  18
  19 static void
  20 prepare (void)
  21 {
  22   fd = create_temp_file ("wrewind.", NULL);
  23   if (fd == -1)
  24     exit (3);
  25 }
  26
  27
  28 static int
  29 do_test (void)
  30 {
  31   FILE *fptr;
  32   char arg1;
  33   char arg2;
  34   int ret1, ret2, result, num;
  35
  36   ret1 = 0;
  37   ret2 = 0;
  38
  39   fptr = fdopen (fd, "w+");
  40   if (fptr == NULL)
  41     {
  42       printf ("Unable to open file.\n");
  43       return 1;
  44     }
  45
  46   if (fwprintf (fptr, L"cderf") <= 0)
  47     {
  48       printf ("Unable to write to file with fwprintf().\n");
  49       fclose (fptr);
  50       return 2;
  51     }
  52
  53   rewind (fptr);
  54   ret1 = fwscanf (fptr, L"%c%c", &arg1, &arg2);
  55   if (ret1 != 2)
  56     {
  57       printf ("first fwscanf returned %d, expected 2\n", ret1);
  58       return 3;
  59     }
  60
  61   rewind (fptr);
  62   ret2 = fwscanf (fptr, L"%c%n%c", &arg1, &num, &arg2);
  63   if (ret2 != 2)
  64     {
  65       printf ("second fwscanf returned %d, expected 2\n", ret2);
  66       return 4;
  67     }
  68
  69   if (arg2 != 'd')
  70     {
  71       result = FAILED;
  72       printf ("rewind after first fwscanf failed\n");
  73     }
  74   else
  75     {
  76       printf ("Passed\n");
  77       result = PASSED;
  78     }
  79
  80
  81   fclose (fptr);
  82   return result;
  83 }