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/* $OpenBSD: shortseek.c,v 1.1 2013/11/03 00:20:24 schwarze Exp $ */
/* Written by Otto Moerbeek, 2006, Public domain. */
/* Modified by Ingo Schwarze, 2013, 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 5
static void
shortloop(DIR *dp, int iend, int iback)
{
struct dirent *f;
char fend[PATH_MAX], fback[PATH_MAX];
long pos, t, remember = -1;
int i;
rewinddir(dp);
snprintf(fend, sizeof fend, "%d", iend);
snprintf(fback, sizeof fback, "%d", iback);
/* Scan to iend, remember where iback is. */
for (;;) {
pos = telldir(dp);
f = readdir(dp);
if (f == NULL)
errx(1, "file %s not found", fend);
if (strcmp(fback, f->d_name) == 0)
remember = pos;
if (strcmp(fend, f->d_name) == 0)
break;
}
if (remember == -1)
errx(1, "file %s not found", fback);
/* Go back to iback, checking seekdir, telldir and readdir. */
seekdir(dp, remember);
if ((t = telldir(dp)) != remember)
errx(1, "tell after seek %s %ld != %ld", fback, t, remember);
if ((t = telldir(dp)) != remember)
errx(1, "tell after tell %s %ld != %ld", fback, t, remember);
f = readdir(dp);
if (f == NULL)
errx(1, "readdir %s at %ld", fback, remember);
if (strcmp(f->d_name, fback))
errx(1, "name mismatch: %s != %s", f->d_name, fback);
/* Check that readdir can iterate the remaining files. */
for (i = iback + 1; i < NFILES; i++) {
f = readdir(dp);
if (f == NULL)
errx(1, "readdir %i failed", i);
}
/* Check that readdir stops at the right place. */
f = readdir(dp);
if (f != NULL)
errx(1, "readdir %i returned %s", NFILES, f->d_name);
}
void
shortseek(void)
{
DIR *dp;
int iend, iback;
createfiles(NFILES);
dp = opendir("d");
if (dp == NULL)
err(1, "shortseek: opendir");
for (iend = 0; iend < NFILES; iend++)
for (iback = 0; iback <= iend; iback++)
shortloop(dp, iend, iback);
closedir(dp);
delfiles();
}
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