getcwd.c: Use a more readable witness: HAVE_OPENAT_SUPPORT

* lib/getcwd.c: Define and use HAVE_OPENAT_SUPPORT, in place of AT_FDCWD.

diff --git a/ChangeLog b/ChangeLog
index a8f8b4c..e64c846 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2007-12-17  Petr Salinger  <Petr.Salinger@seznam.cz>
+
+       getcwd.c: Use a more readable witness: HAVE_OPENAT_SUPPORT
+       * lib/getcwd.c: Define and use HAVE_OPENAT_SUPPORT, in place of AT_FDCWD.
+
 2007-12-17  Jim Meyering  <meyering@redhat.com>
 
        Port to GNU/kFreeBSD - FreeBSD kernel + GNU libc,

diff --git a/lib/getcwd.c b/lib/getcwd.c
index 98df8bf..2397c08 100644 (file)
--- a/lib/getcwd.c
+++ b/lib/getcwd.c
@@ -29,9 +29,12 @@
 
 #include <fcntl.h> /* For AT_FDCWD on Solaris 9.  */
 
-/* On a system without the openat function, undefine AT_FDCWD.  */
-#if ! HAVE_OPENAT
-# undef AT_FDCWD
+/* If this host provides the openat function, then enable
+   code below to make getcwd more efficient and robust.  */
+#ifdef HAVE_OPENAT
+# define HAVE_OPENAT_SUPPORT 1
+#else
+# define HAVE_OPENAT_SUPPORT 0
 #endif
 
 #ifndef __set_errno
@@ -127,7 +130,7 @@ __getcwd (char *buf, size_t size)
       DEEP_NESTING = 100
     };
 
-#ifdef AT_FDCWD
+#if HAVE_OPENAT_SUPPORT
   int fd = AT_FDCWD;
   bool fd_needs_closing = false;
 #else
@@ -208,7 +211,7 @@ __getcwd (char *buf, size_t size)
       bool use_d_ino = true;
 
       /* Look at the parent directory.  */
-#ifdef AT_FDCWD
+#if HAVE_OPENAT_SUPPORT
       fd = openat (fd, "..", O_RDONLY);
       if (fd < 0)
        goto lose;
@@ -235,7 +238,7 @@ __getcwd (char *buf, size_t size)
       mount_point = dotdev != thisdev;
 
       /* Search for the last directory.  */
-#ifdef AT_FDCWD
+#if HAVE_OPENAT_SUPPORT
       dirstream = fdopendir (fd);
       if (dirstream == NULL)
        goto lose;
@@ -291,7 +294,7 @@ __getcwd (char *buf, size_t size)
 
          {
            int entry_status;
-#ifdef AT_FDCWD
+#if HAVE_OPENAT_SUPPORT
            entry_status = fstatat (fd, d->d_name, &st, AT_SYMLINK_NOFOLLOW);
 #else
            /* Compute size needed for this file name, or for the file
@@ -387,7 +390,7 @@ __getcwd (char *buf, size_t size)
   if (dirp == &dir[allocated - 1])
     *--dirp = '/';
 
-#ifndef AT_FDCWD
+#if ! HAVE_OPENAT_SUPPORT
   if (dotlist != dots)
     free (dotlist);
 #endif
@@ -413,7 +416,7 @@ __getcwd (char *buf, size_t size)
     int save = errno;
     if (dirstream)
       __closedir (dirstream);
-#ifdef AT_FDCWD
+#if HAVE_OPENAT_SUPPORT
     if (fd_needs_closing)
       close (fd);
 #else