1 /* Check for a sim bug, whereby the position was always unsigned
2 (truncation instead of sign-extension for 64-bit hosts). */
3 #include <stdio.h>
4 #include <stdlib.h>
5 #include <string.h>
6 #include <sys/types.h>
7 #include <sys/stat.h>
8 #include <fcntl.h>
9 #include <unistd.h>
10
11 int
main(void)12 main (void)
13 {
14 FILE *f;
15 const char fname[] = "sk1test.dat";
16 const char tsttxt[]
17 = "A random line of text, used to test correct read, write and seek.\n";
18 char buf[sizeof tsttxt] = "";
19 const char correct[] = "correct";
20 char buf2[sizeof correct] = {0};
21 int fd;
22
23 f = fopen (fname, "wb");
24 if (f == NULL
25 || fwrite (tsttxt, 1, strlen (tsttxt), f) != strlen (tsttxt)
26 || fclose (f) != 0)
27 {
28 printf ("fail\n");
29 exit (1);
30 }
31
32 /* We have to use file-descriptor calls instead of stream calls to
33 provoke the bug (for stream calls, the lseek call is canonicalized
34 to use SEEK_SET). */
35 fd = open (fname, O_RDONLY);
36 if (fd < 0
37 || read (fd, buf, strlen (tsttxt)) != strlen (tsttxt)
38 || strcmp (buf, tsttxt) != 0
39 || lseek (fd, -30L, SEEK_CUR) != 36
40 || read (fd, buf2, strlen (correct)) != strlen (correct)
41 || strcmp (buf2, correct) != 0)
42 {
43 printf ("fail\n");
44 exit (1);
45 }
46
47 printf ("pass\n");
48 exit (0);
49 }
50