124 lines
2.5 KiB
C
124 lines
2.5 KiB
C
/* dirent.c
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Replacements for opendir, readdir and closedir for the original
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Unix filesystem only.
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Copyright (C) 1992 Ian Lance Taylor
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This file is part of the Taylor UUCP package.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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The author of the program may be contacted at ian@airs.com or
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c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
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*/
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#include "uucp.h"
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#include "sysdep.h"
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#include <errno.h>
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#else
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#if HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#endif
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#ifndef O_RDONLY
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#define O_RDONLY 0
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#endif
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#ifndef O_NOCTTY
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#define O_NOCTTY 0
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#endif
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#ifndef FD_CLOEXEC
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#define FD_CLOEXEC 1
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#endif
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/* Simple emulations of opendir/readdir/closedir for systems which
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have the original format of Unix directories. It's probably better
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to get Doug Gwyn's public domain set of emulation functions. */
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DIR *
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opendir (zdir)
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const char *zdir;
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{
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int o;
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struct stat s;
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DIR *qret;
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o = open ((char *) zdir, O_RDONLY | O_NOCTTY, 0);
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if (o < 0)
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return NULL;
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if (fcntl (o, F_SETFD, fcntl (o, F_GETFD, 0) | FD_CLOEXEC) < 0
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|| fstat (o, &s) < 0)
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{
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int isave;
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isave = errno;
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(void) close (o);
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errno = isave;
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return NULL;
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}
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if (! S_ISDIR (s.st_mode))
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{
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(void) close (o);
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errno = ENOTDIR;
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return NULL;
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}
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qret = (DIR *) xmalloc (sizeof (DIR));
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qret->o = o;
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return qret;
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}
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struct dirent *
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readdir (q)
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DIR *q;
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{
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struct direct sdir;
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int cgot;
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do
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{
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cgot = read (q->o, &sdir, sizeof (struct direct));
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if (cgot <= 0)
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return NULL;
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if (cgot != sizeof (struct direct))
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{
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errno = ENOENT;
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return NULL;
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}
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}
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while (sdir.d_ino == 0);
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strncpy (q->s.d_name, sdir.d_name, DIRSIZ);
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q->s.d_name[DIRSIZ] = '\0';
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return &q->s;
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}
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int
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closedir (q)
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DIR *q;
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{
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int o;
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o = q->o;
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xfree (q);
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return close (o);
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}
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