Line data    Source code

       1             : /* get_env.c - A getenv() replacement.
       2             :    Copyright (C) 2003, 2004 g10 Code GmbH
       3             : 
       4             :    This file is part of GPGME.
       5             : 
       6             :    GPGME is free software; you can redistribute it and/or modify it
       7             :    under the terms of the GNU Lesser General Public License as
       8             :    published by the Free Software Foundation; either version 2.1 of
       9             :    the License, or (at your option) any later version.
      10             : 
      11             :    GPGME is distributed in the hope that it will be useful, but
      12             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :    Lesser General Public License for more details.
      15             : 
      16             :    You should have received a copy of the GNU Lesser General Public
      17             :    License along with this program; if not, write to the Free Software
      18             :    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
      19             :    02111-1307, USA.  */
      20             : 
      21             : #if HAVE_CONFIG_H
      22             : #include <config.h>
      23             : #endif
      24             : #include <stdlib.h>
      25             : #include <errno.h>
      26             : #include <string.h>
      27             : 
      28             : #include "util.h"
      29             : 
      30             : 
      31             : /* Retrieve the environment variable NAME and return a copy of it in a
      32             :    malloc()'ed buffer in *VALUE.  If the environment variable is not
      33             :    set, return NULL in *VALUE.  */
      34             : 
      35             : #ifdef HAVE_GETENV_R
      36             : #define INITIAL_GETENV_SIZE 32
      37             : 
      38             : gpgme_error_t
      39             : _gpgme_getenv (const char *name, char **value)
      40             : {
      41             :   size_t len = INITIAL_GETENV_SIZE;
      42             :   char *env_value;
      43             : 
      44             :   env_value = malloc (len);
      45             : 
      46             :   while (1)
      47             :     {
      48             :       *value = env_value;
      49             :       if (!env_value)
      50             :         return gpg_error_from_syserror ();
      51             : 
      52             :       if (getenv_r (name, env_value, len) == 0)
      53             :         break;
      54             : 
      55             :       if (errno == ERANGE)
      56             :         {
      57             :           len *= 2;
      58             :           env_value = realloc (env_value, len);
      59             :         }
      60             :       else
      61             :         {
      62             :           int saved = errno;
      63             : 
      64             :           free (env_value);
      65             :           *value = NULL;
      66             :           if (errno == ENOENT)
      67             :             return 0;
      68             :           else
      69             :           return gpg_error_from_errno (saved);
      70             :         }
      71             :     }
      72             : 
      73             :   return 0;
      74             : }
      75             : #else
      76             : #ifndef HAVE_THREAD_SAFE_GETENV
      77             : GPGRT_LOCK_DEFINE (environ_lock);
      78             : #endif
      79             : 
      80             : gpgme_error_t
      81        2387 : _gpgme_getenv (const char *name, char **value)
      82             : {
      83             :   char *env_value;
      84        2387 :   gpgme_error_t err = 0;
      85             : 
      86             : #ifndef HAVE_THREAD_SAFE_GETENV
      87             :   gpg_err_code_t rc;
      88             : 
      89             :   rc= gpgrt_lock_lock (&environ_lock);
      90             :   if (rc)
      91             :     {
      92             :       err = gpg_error (rc);
      93             :       goto leave;
      94             :     }
      95             : #endif
      96        2387 :   env_value = getenv (name);
      97        2388 :   if (!env_value)
      98         882 :     *value = NULL;
      99             :   else
     100             :     {
     101        1506 :       *value = strdup (env_value);
     102        1506 :       if (!*value)
     103           0 :         err = gpg_error_from_syserror ();
     104             :     }
     105             : #ifndef HAVE_THREAD_SAFE_GETENV
     106             :   rc = gpgrt_lock_unlock (&environ_lock);
     107             :   if (rc)
     108             :     err = gpg_error (rc);
     109             :  leave:
     110             : #endif
     111        2387 :   return err;
     112             : }
     113             : #endif