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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., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- The author of the program may be contacted at ian@airs.com or
- c/o Infinity Development Systems, P.O. Box 520, Waltham, MA 02254.
- */
-
- #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);
- }
-