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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /sysdeps/unix/readdir.c
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initial import
Diffstat (limited to 'sysdeps/unix/readdir.c')
-rw-r--r--sysdeps/unix/readdir.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/sysdeps/unix/readdir.c b/sysdeps/unix/readdir.c
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+++ b/sysdeps/unix/readdir.c
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+/* Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <limits.h>
+#include <stddef.h>
+#include <string.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#include "direct.h" /* This file defines `struct direct'. */
+
+/* direct.h may have an alternate definition for this. */
+#ifndef D_RECLEN
+#define D_RECLEN(dp) ((dp)->d_reclen)
+#endif
+
+
+/* Read a directory entry from DIRP. */
+struct dirent *
+DEFUN(readdir, (dirp), DIR *dirp)
+{
+ if (dirp == NULL || dirp->__data == NULL)
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ while (1)
+ {
+ struct direct *dp;
+
+ if (dirp->__offset >= dirp->__size)
+ {
+ /* We've emptied out our buffer. Refill it. */
+
+ off_t base;
+ ssize_t bytes = __getdirentries (dirp->__fd, dirp->__data,
+ dirp->__allocation, &base);
+ if (bytes <= 0)
+ return NULL;
+ dirp->__size = (size_t) bytes;
+
+ /* Reset the offset into the buffer. */
+ dirp->__offset = 0;
+ }
+
+ dp = (struct direct *) &dirp->__data[dirp->__offset];
+ dirp->__offset += D_RECLEN (dp);
+
+ if (dp->d_ino != 0)
+ {
+ /* Not a deleted file. */
+ register struct dirent *d = &dirp->__entry;
+ register const char *p;
+ d->d_fileno = (ino_t) dp->d_ino;
+ /* On some systems the name length does not actually mean much.
+ But we always use it as a maximum. */
+ p = memchr ((PTR) dp->d_name, '\0', D_NAMLEN (dp) + 1);
+ d->d_namlen = (p != NULL) ? p - dp->d_name : D_NAMLEN (dp);
+ memcpy (d->d_name, dp->d_name, d->d_namlen + 1);
+ return d;
+ }
+ }
+}