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96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library 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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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <limits.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <stdio.h>
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#include "direct.h" /* This file defines `struct direct'. */
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/* Open a directory stream on NAME. */
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DIR *
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DEFUN(opendir, (name), CONST char *name)
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{
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DIR *dirp;
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struct stat statbuf;
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int fd;
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if (name[0] == '\0')
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{
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/* POSIX.1-1990 says an empty name gets ENOENT;
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but `open' might like it fine. */
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errno = ENOENT;
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return NULL;
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}
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fd = __open (name, O_RDONLY);
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if (fd < 0)
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return NULL;
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if (fcntl (fd, F_SETFD, FD_CLOEXEC) < 0)
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goto lose;
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if (fstat (fd, &statbuf) < 0)
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goto lose;
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if (! S_ISDIR (statbuf.st_mode))
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{
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errno = ENOTDIR;
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goto lose;
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}
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dirp = (DIR *) calloc (1, sizeof (DIR) + NAME_MAX); /* Zero-fill. */
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if (dirp == NULL)
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lose:
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{
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int save = errno;
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(void) __close (fd);
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errno = save;
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return NULL;
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}
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#ifdef _STATBUF_ST_BLKSIZE
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if (statbuf.st_blksize < sizeof (struct direct))
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dirp->__allocation = sizeof (struct direct);
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else
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dirp->__allocation = statbuf.st_blksize;
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#else
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dirp->__allocation = (BUFSIZ < sizeof (struct direct) ?
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sizeof (struct direct) : BUFSIZ);
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#endif
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dirp->__data = (char *) malloc (dirp->__allocation);
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if (dirp->__data == NULL)
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{
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int save = errno;
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free ((PTR) dirp);
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(void) __close (fd);
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errno = save;
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return NULL;
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}
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dirp->__fd = fd;
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return dirp;
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}
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