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 2331 : _gpgme_getenv (const char *name, char **value)
82 : {
83 : char *env_value;
84 2331 : 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 2331 : env_value = getenv (name);
97 2333 : if (!env_value)
98 845 : *value = NULL;
99 : else
100 : {
101 1488 : *value = strdup (env_value);
102 1488 : 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 2333 : return err;
112 : }
113 : #endif
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