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
  56   rewind (fptr);
  57   ret2 = fwscanf (fptr, L"%c%n%c", &arg1, &num, &arg2);
  58
  59   if (arg2 != 'd')
  60     {
  61       result = FAILED;
  62       printf ("rewind after first fwscanf failed\n");
  63     }
  64   else
  65     {
  66       printf ("Passed\n");
  67       result = PASSED;
  68     }
  69
  70
  71   fclose (fptr);
  72   return result;
  73 }