Libc-498.tar.gz

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

diff --git a/gen/readdir-fbsd.c b/gen/readdir-fbsd.c
new file mode 100644 (file)
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--- /dev/null
+++ b/gen/readdir-fbsd.c
@@ -0,0 +1,141 @@
+/*
+ * 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.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)readdir.c  8.3 (Berkeley) 9/29/94";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/gen/readdir.c,v 1.11 2002/02/26 21:39:32 alfred Exp $");
+
+#include "namespace.h"
+#include <sys/param.h>
+#include <dirent.h>
+#include <errno.h>
+#include <string.h>
+#include <pthread.h>
+#include <unistd.h>
+#include "un-namespace.h"
+
+#include "telldir.h"
+#include "libc_private.h"
+
+/*
+ * get next entry in a directory.
+ */
+struct dirent *
+_readdir_unlocked(dirp)
+       DIR *dirp;
+{
+       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)) {
+#if __DARWIN_64_BIT_INO_T
+                       dirp->dd_size = __getdirentries64(dirp->dd_fd,
+                           dirp->dd_buf, dirp->dd_len, &dirp->dd_td->seekoff);
+#else /* !__DARWIN_64_BIT_INO_T */
+                       dirp->dd_size = _getdirentries(dirp->dd_fd,
+                           dirp->dd_buf, dirp->dd_len, &dirp->dd_seek);
+#endif /* __DARWIN_64_BIT_INO_T */
+                       if (dirp->dd_size <= 0)
+                               return (NULL);
+               }
+               dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
+               if ((long)dp & 03L)     /* 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);
+       }
+}
+
+struct dirent *
+readdir(dirp)
+       DIR *dirp;
+{
+       struct dirent   *dp;
+
+       if (__isthreaded) {
+               _pthread_mutex_lock((pthread_mutex_t *)&dirp->dd_lock);
+               dp = _readdir_unlocked(dirp);
+               _pthread_mutex_unlock((pthread_mutex_t *)&dirp->dd_lock);
+       }
+       else
+               dp = _readdir_unlocked(dirp);
+       return (dp);
+}
+
+int
+readdir_r(dirp, entry, result)
+       DIR *dirp;
+       struct dirent *entry;
+       struct dirent **result;
+{
+       struct dirent *dp;
+       int saved_errno;
+
+       saved_errno = errno;
+       errno = 0;
+       if (__isthreaded) {
+               _pthread_mutex_lock((pthread_mutex_t *)&dirp->dd_lock);
+               if ((dp = _readdir_unlocked(dirp)) != NULL)
+                       memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
+               _pthread_mutex_unlock((pthread_mutex_t *)&dirp->dd_lock);
+       }
+       else if ((dp = _readdir_unlocked(dirp)) != NULL)
+               memcpy(entry, dp, _GENERIC_DIRSIZ(dp));
+
+       if (errno != 0) {
+               if (dp == NULL)
+                       return (errno);
+       } else
+               errno = saved_errno;
+
+       if (dp != NULL)
+               *result = entry;
+       else
+               *result = NULL;
+
+       return (0);
+}