1 /* $OpenBSD: telldir.c,v 1.4 2013/11/03 00:20:24 schwarze Exp $ */
2
3 /* Written by Otto Moerbeek, 2006, Public domain. */
4
5 #include <sys/types.h>
6 #include <dirent.h>
7 #include <err.h>
8 #include <limits.h>
9 #include <stdio.h>
10 #include <string.h>
11
12 #include "utils.h"
13
14 #define NFILES 1000
15
16 static void
longloop(DIR * dp,int i)17 longloop(DIR *dp, int i)
18 {
19 struct dirent *f;
20 char file[PATH_MAX];
21 long pos, t, remember = -1;
22
23 rewinddir(dp);
24 snprintf(file, sizeof file, "%d", i);
25
26 /* Scan through all files, remember where file i is. */
27
28 for (;;) {
29 pos = telldir(dp);
30 f = readdir(dp);
31 if (f == NULL)
32 break;
33 if (strcmp(file, f->d_name) == 0)
34 remember = pos;
35 }
36 if (remember == -1)
37 errx(1, "remember %s", file);
38
39 /* Go back to i, checking seekdir, telldir and readdir. */
40
41 seekdir(dp, remember);
42 if ((t = telldir(dp)) != remember)
43 errx(1, "tell after seek %s %ld != %ld", file, t, remember);
44 if ((t = telldir(dp)) != remember)
45 errx(1, "tell after tell %s %ld != %ld", file, t, remember);
46 f = readdir(dp);
47 if (f == NULL)
48 errx(1, "readdir %s at %ld", file, remember);
49
50 if (strcmp(f->d_name, file) != 0)
51 errx(1, "name mismatch: %s != %s", f->d_name, file);
52 }
53
54 void
longseek(void)55 longseek(void)
56 {
57 DIR *dp;
58 int i;
59
60 createfiles(NFILES);
61
62 dp = opendir("d");
63 if (dp == NULL)
64 err(1, "longseek: opendir");
65
66 for (i = 0; i < NFILES; i++)
67 longloop(dp, (i + NFILES/2) % NFILES);
68
69 closedir(dp);
70 delfiles();
71 }
72