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/* $OpenBSD: telldir.c,v 1.4 2013/11/03 00:20:24 schwarze Exp $ */
/* Written by Otto Moerbeek, 2006, Public domain. */
#include <sys/types.h>
#include <dirent.h>
#include <err.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include "utils.h"
#define NFILES 1000
static void
longloop(DIR *dp, int i)
{
struct dirent *f;
char file[PATH_MAX];
long pos, t, remember = -1;
rewinddir(dp);
snprintf(file, sizeof file, "%d", i);
/* Scan through all files, remember where file i is. */
for (;;) {
pos = telldir(dp);
f = readdir(dp);
if (f == NULL)
break;
if (strcmp(file, f->d_name) == 0)
remember = pos;
}
if (remember == -1)
errx(1, "remember %s", file);
/* Go back to i, checking seekdir, telldir and readdir. */
seekdir(dp, remember);
if ((t = telldir(dp)) != remember)
errx(1, "tell after seek %s %ld != %ld", file, t, remember);
if ((t = telldir(dp)) != remember)
errx(1, "tell after tell %s %ld != %ld", file, t, remember);
f = readdir(dp);
if (f == NULL)
errx(1, "readdir %s at %ld", file, remember);
if (strcmp(f->d_name, file) != 0)
errx(1, "name mismatch: %s != %s", f->d_name, file);
}
void
longseek(void)
{
DIR *dp;
int i;
createfiles(NFILES);
dp = opendir("d");
if (dp == NULL)
err(1, "longseek: opendir");
for (i = 0; i < NFILES; i++)
longloop(dp, (i + NFILES/2) % NFILES);
closedir(dp);
delfiles();
}
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