1 /* Test program for ungetc/ftell interaction bug. */
5 #include <support/xunistd.h>
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"
13 static const char pattern[] = "12345";
14 static char *temp_file;
19 int fd = create_temp_file ("bug-ungetc.", &temp_file);
22 printf ("cannot create temporary file: %m\n");
25 xwrite (fd, pattern, sizeof (pattern));
30 do_one_test (int mode)
34 f = fopen (temp_file, "r");
37 printf ("could not open temporary file: %m\n");
41 if (mode == 1 && ftell (f) != 0)
43 printf ("first ftell returned wrong position %ld\n", ftell (f));
47 if (fgetc (f) != '1' || fgetc (f) != '2')
49 puts ("fgetc failed");
53 if (mode == 2 && ftell (f) != 2)
55 printf ("second ftell returned wrong position %ld\n", ftell (f));
59 if (ungetc ('6', f) != '6')
61 puts ("ungetc failed");
67 printf ("third ftell returned wrong position %ld\n", ftell (f));
73 puts ("fgetc failed");
79 printf ("fourth ftell returned wrong position %ld\n", ftell (f));
92 for (mode = 0; mode <= 2; mode++)
93 if (do_one_test (mode))