Libc-262.tar.gz

[apple/libc.git] / gen / readdir.c

diff --git a/gen/readdir.c b/gen/readdir.c
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+++ b/gen/readdir.c
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1983, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#include <sys/param.h>
+#include <dirent.h>
+
+/*
+ * get next entry in a directory.
+ */
+struct dirent *
+readdir(dirp)
+       register DIR *dirp;
+{
+       register struct dirent *dp;
+
+       for (;;) {
+               if (dirp->dd_loc >= dirp->dd_size) {
+                       if (dirp->dd_flags & __DTF_READALL)
+                               return (NULL);
+                       dirp->dd_loc = 0;
+               }
+               if (dirp->dd_loc == 0 && !(dirp->dd_flags & __DTF_READALL)) {
+                       dirp->dd_size = getdirentries(dirp->dd_fd,
+                           dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
+                       if (dirp->dd_size <= 0)
+                               return (NULL);
+               }
+               dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
+               if ((int)dp & 03)       /* bogus pointer check */
+                       return (NULL);
+               if (dp->d_reclen <= 0 ||
+                   dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
+                       return (NULL);
+               dirp->dd_loc += dp->d_reclen;
+               if (dp->d_ino == 0)
+                       continue;
+               if (dp->d_type == DT_WHT && (dirp->dd_flags & DTF_HIDEW))
+                       continue;
+               return (dp);
+       }
+}