Adding upstream version 9.4.upstream/9.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/lib/areadlinkat.c b/lib/areadlinkat.c
new file mode 100644
index 0000000..f78c05e
--- /dev/null
+++ b/lib/areadlinkat.c
@@ -0,0 +1,67 @@
+/* areadlinkat.c -- readlinkat wrapper to return malloc'd link name
+   Unlike xreadlinkat, only call exit on failure to change directory.
+
+   Copyright (C) 2001, 2003-2007, 2009-2023 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Jim Meyering <jim@meyering.net>,
+   and Bruno Haible <bruno@clisp.org>,
+   and Eric Blake <ebb9@byu.net>.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include "areadlink.h"
+
+#include <stdlib.h>
+
+#include "careadlinkat.h"
+
+#if HAVE_READLINKAT
+
+/* Call readlinkat to get the symbolic link value of FILENAME relative to FD.
+   Return a pointer to that NUL-terminated string in malloc'd storage.
+   If readlinkat fails, return NULL and set errno (although failure to
+   change directory will issue a diagnostic and exit).
+   If allocation fails, or if the link value is longer than SIZE_MAX :-),
+   return NULL and set errno to ENOMEM.  */
+
+char *
+areadlinkat (int fd, char const *filename)
+{
+  return careadlinkat (fd, filename, NULL, 0, NULL, readlinkat);
+}
+
+#else /* !HAVE_READLINKAT */
+
+/* It is more efficient to change directories only once and call
+   areadlink, rather than repeatedly call the replacement
+   readlinkat.  */
+
+# define AT_FUNC_NAME areadlinkat
+# define AT_FUNC_F1 areadlink
+# define AT_FUNC_POST_FILE_PARAM_DECLS /* empty */
+# define AT_FUNC_POST_FILE_ARGS        /* empty */
+# define AT_FUNC_RESULT char *
+# define AT_FUNC_FAIL NULL
+# include "at-func.c"
+# undef AT_FUNC_NAME
+# undef AT_FUNC_F1
+# undef AT_FUNC_POST_FILE_PARAM_DECLS
+# undef AT_FUNC_POST_FILE_ARGS
+# undef AT_FUNC_RESULT
+# undef AT_FUNC_FAIL
+
+#endif /* !HAVE_READLINKAT */