root/lib/common/compat.c

/* */

DEFINITIONS

1. crm_compat_realpath

   1 /*
   2  * Copyright (C) 2015 Andrew Beekhof <andrew@beekhof.net>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 
  19 #ifndef _GNU_SOURCE
  20 #  define _GNU_SOURCE
  21 #endif
  22 
  23 #include <crm_internal.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26 #include <limits.h>
  27 #include <stdlib.h>
  28 #include <errno.h>
  29 
  30 /*!
  31  * \internal
  32  * \brief Return canonicalized form of a path name, like realpath(path, NULL)
  33  *
  34  * \param[in] path Pathname to canonicalize
  35  *
  36  * \return Canonicalized pathname
  37  * \note The caller is responsible for freeing the result of this funtion.
  38  */
  39 char *
  40 crm_compat_realpath(const char *path)
     /*  */
  41 {
  42 #if _POSIX_VERSION >= 200809L
  43     /* Recent C libraries can dynamically allocate memory as needed */
  44     return realpath(path, NULL);
  45 
  46 #elif defined(PATH_MAX)
  47     /* Older implementations require pre-allocated memory */
  48     /* (this is less desirable because PATH_MAX may be huge or not defined) */
  49     char *canonicalized = malloc(PATH_MAX);
  50     if ((canonicalized == NULL) || (realpath(path, canonicalized) == NULL)) {
  51         return NULL;
  52     }
  53     return canonicalized;
  54 #else
  55     errno = ENOTSUP;
  56     return NULL;
  57 #endif
  58 }

/* */