libio/bug-rewind2.c

   1 #include <stdio.h>
   2 #include <wchar.h>
   3
   4
   5 static int fd;
   6
   7 static void prepare (void);
   8 #define PREPARE(argc, argv) prepare ()
   9
  10
  11 #define TEST_FUNCTION do_test ()
  12 static int do_test (void);
  13 #include "../test-skeleton.c"
  14
  15
  16 static void
  17 prepare (void)
  18 {
  19   fd = create_temp_file ("wrewind2.", NULL);
  20   if (fd == -1)
  21     exit (3);
  22 }
  23
  24
  25 static int
  26 do_test (void)
  27 {
  28   wchar_t dummy[10];
  29   int ret = 0;
  30   FILE *fp;
  31   int result = 0;
  32
  33   fp = fdopen (fd, "w+");
  34   if (fp == NULL)
  35     {
  36       puts ("fopen(""testfile"", ""w+"") returned NULL.");
  37       return 1;
  38     }
  39   else
  40     {
  41       fwprintf (fp, L"abcd");
  42       printf ("current pos = %ld\n", ftell (fp));
  43       if (ftell (fp) != 4)
  44         result = 1;
  45
  46       rewind (fp);
  47       ret = fwscanf (fp, L"%c", dummy);
  48       if (ret != 1)
  49         {
  50           printf ("fwscanf returned %d, expected 1\n", ret);
  51           result = 1;
  52         }
  53
  54       printf ("current pos = %ld\n", ftell (fp));
  55       if (ftell (fp) != 1)
  56         result = 1;
  57
  58       rewind (fp);
  59       printf ("current pos = %ld\n", ftell (fp));
  60       if (ftell (fp) != 0)
  61         result = 1;
  62
  63       fclose (fp);
  64     }
  65
  66   return result;
  67 }