libio/bug-wsetpos.c

   1 /* Test program for fsetpos on a wide character stream.  */
   2
   3 #include <assert.h>
   4 #include <stdio.h>
   5 #include <wchar.h>
   6
   7 static void do_prepare (void);
   8 #define PREPARE(argc, argv) do_prepare ()
   9 static int do_test (void);
  10 #define TEST_FUNCTION do_test ()
  11 #include <test-skeleton.c>
  12
  13 static const char pattern[] = "12345";
  14 static char *temp_file;
  15
  16 static void
  17 do_prepare (void)
  18 {
  19   int fd = create_temp_file ("bug-wsetpos.", &temp_file);
  20   if (fd == -1)
  21     {
  22       printf ("cannot create temporary file: %m\n");
  23       exit (1);
  24     }
  25   write (fd, pattern, sizeof (pattern));
  26   close (fd);
  27 }
  28
  29 static int
  30 do_test (void)
  31 {
  32   FILE *fp = fopen (temp_file, "r");
  33   fpos_t pos;
  34   wchar_t c;
  35
  36   if (fp == NULL)
  37     {
  38       printf ("fdopen: %m\n");
  39       return 1;
  40     }
  41
  42   c = fgetwc (fp); assert (c == L'1');
  43   c = fgetwc (fp); assert (c == L'2');
  44
  45   if (fgetpos (fp, &pos) == EOF)
  46     {
  47       printf ("fgetpos: %m\n");
  48       return 1;
  49     }
  50
  51   rewind (fp);
  52   if (ferror (fp))
  53     {
  54       printf ("rewind: %m\n");
  55       return 1;
  56     }
  57
  58   c = fgetwc (fp); assert (c == L'1');
  59
  60   if (fsetpos (fp, &pos) == EOF)
  61     {
  62       printf ("fsetpos: %m\n");
  63       return 1;
  64     }
  65
  66   c = fgetwc (fp);
  67   if (c != L'3')
  68     {
  69       puts ("fsetpos failed");
  70       return 1;
  71     }
  72
  73   puts ("Test succeeded.");
  74   return 0;
  75 }