/* xreadlink.c -- readlink wrapper to return the link name in malloc'd storage
- Copyright (C) 2001, 2003, 2004, 2005, 2006 Free Software
- Foundation, Inc.
+ Copyright (C) 2001, 2003-2007, 2009-2010 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; see the file COPYING.
- If not, write to the Free Software Foundation,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-/* Written by Jim Meyering <jim@meyering.net> */
+/* Written by Jim Meyering <jim@meyering.net>
+ and Bruno Haible <bruno@clisp.org>. */
#include <config.h>
+/* Specification. */
#include "xreadlink.h"
-#include <stdio.h>
#include <errno.h>
-#include <limits.h>
-#include <sys/types.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-#ifndef SIZE_MAX
-# define SIZE_MAX ((size_t) -1)
-#endif
-#ifndef SSIZE_MAX
-# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
-#endif
-
-#define MAXSIZE (SIZE_MAX < SSIZE_MAX ? SIZE_MAX : SSIZE_MAX)
+#include "areadlink.h"
#include "xalloc.h"
-/* Call readlink to get the symbolic link value of FILE.
- SIZE is a hint as to how long the link is expected to be;
- typically it is taken from st_size. It need not be correct.
+/* Call readlink to get the symbolic link value of FILENAME.
Return a pointer to that NUL-terminated string in malloc'd storage.
- If readlink fails, return NULL (caller may use errno to diagnose).
- If malloc fails, or if the link value is longer than SSIZE_MAX :-),
+ If readlink fails, return NULL and set errno.
+ If realloc fails, or if the link value is longer than SIZE_MAX :-),
give a diagnostic and exit. */
char *
-xreadlink (char const *file, size_t size)
+xreadlink (char const *filename)
{
- /* The initial buffer size for the link value. A power of 2
- detects arithmetic overflow earlier, but is not required. */
- size_t buf_size = size < MAXSIZE ? size + 1 : MAXSIZE;
-
- while (1)
- {
- char *buffer = xmalloc (buf_size);
- ssize_t r = readlink (file, buffer, buf_size);
- size_t link_length = r;
-
- /* On AIX 5L v5.3 and HP-UX 11i v2 04/09, readlink returns -1
- with errno == ERANGE if the buffer is too small. */
- if (r < 0 && errno != ERANGE)
- {
- int saved_errno = errno;
- free (buffer);
- errno = saved_errno;
- return NULL;
- }
-
- if (link_length < buf_size)
- {
- buffer[link_length] = 0;
- return buffer;
- }
-
- free (buffer);
- if (buf_size <= MAXSIZE / 2)
- buf_size *= 2;
- else if (buf_size < MAXSIZE)
- buf_size = MAXSIZE;
- else
- xalloc_die ();
- }
+ char *result = areadlink (filename);
+ if (result == NULL && errno == ENOMEM)
+ xalloc_die ();
+ return result;
}