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83 lines
2.3 KiB
C
83 lines
2.3 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 <string.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include "direct.h" /* This file defines `struct direct'. */
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/* direct.h may have an alternate definition for this. */
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#ifndef D_RECLEN
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#define D_RECLEN(dp) ((dp)->d_reclen)
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#endif
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/* Read a directory entry from DIRP. */
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struct dirent *
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DEFUN(readdir, (dirp), DIR *dirp)
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{
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if (dirp == NULL || dirp->__data == NULL)
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{
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errno = EINVAL;
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return NULL;
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}
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while (1)
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{
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struct direct *dp;
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if (dirp->__offset >= dirp->__size)
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{
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/* We've emptied out our buffer. Refill it. */
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off_t base;
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ssize_t bytes = __getdirentries (dirp->__fd, dirp->__data,
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dirp->__allocation, &base);
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if (bytes <= 0)
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return NULL;
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dirp->__size = (size_t) bytes;
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/* Reset the offset into the buffer. */
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dirp->__offset = 0;
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}
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dp = (struct direct *) &dirp->__data[dirp->__offset];
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dirp->__offset += D_RECLEN (dp);
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if (dp->d_ino != 0)
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{
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/* Not a deleted file. */
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register struct dirent *d = &dirp->__entry;
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register const char *p;
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d->d_fileno = (ino_t) dp->d_ino;
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/* On some systems the name length does not actually mean much.
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But we always use it as a maximum. */
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p = memchr ((PTR) dp->d_name, '\0', D_NAMLEN (dp) + 1);
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d->d_namlen = (p != NULL) ? p - dp->d_name : D_NAMLEN (dp);
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memcpy (d->d_name, dp->d_name, d->d_namlen + 1);
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return d;
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}
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}
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}
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