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/* dirent.c
Replacements for opendir, readdir and closedir for the original
Unix filesystem only.
Copyright (C) 1992 Ian Lance Taylor
This file is part of the Taylor UUCP package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
The author of the program may be contacted at ian@airs.com or
c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
*/
#include "uucp.h"
#include "sysdep.h"
#include <errno.h>
#if HAVE_FCNTL_H
#include <fcntl.h>
#else
#if HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#endif
#ifndef O_RDONLY
#define O_RDONLY 0
#endif
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif
#ifndef FD_CLOEXEC
#define FD_CLOEXEC 1
#endif
/* Simple emulations of opendir/readdir/closedir for systems which
have the original format of Unix directories. It's probably better
to get Doug Gwyn's public domain set of emulation functions. */
DIR *
opendir (zdir)
const char *zdir;
{
int o;
struct stat s;
DIR *qret;
o = open ((char *) zdir, O_RDONLY | O_NOCTTY, 0);
if (o < 0)
return NULL;
if (fcntl (o, F_SETFD, fcntl (o, F_GETFD, 0) | FD_CLOEXEC) < 0
|| fstat (o, &s) < 0)
{
int isave;
isave = errno;
(void) close (o);
errno = isave;
return NULL;
}
if (! S_ISDIR (s.st_mode))
{
(void) close (o);
errno = ENOTDIR;
return NULL;
}
qret = (DIR *) xmalloc (sizeof (DIR));
qret->o = o;
return qret;
}
struct dirent *
readdir (q)
DIR *q;
{
struct direct sdir;
int cgot;
do
{
cgot = read (q->o, &sdir, sizeof (struct direct));
if (cgot <= 0)
return NULL;
if (cgot != sizeof (struct direct))
{
errno = ENOENT;
return NULL;
}
}
while (sdir.d_ino == 0);
strncpy (q->s.d_name, sdir.d_name, DIRSIZ);
q->s.d_name[DIRSIZ] = '\0';
return &q->s;
}
int
closedir (q)
DIR *q;
{
int o;
o = q->o;
xfree (q);
return close (o);
}
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