114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
/* get_env.c - A getenv() replacement.
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* Copyright (C) 2003, 2004 g10 Code GmbH
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*
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* This file is part of GPGME.
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*
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* GPGME is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* GPGME is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <https://gnu.org/licenses/>.
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#if HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdlib.h>
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#include <errno.h>
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#include <string.h>
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#include "util.h"
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/* Retrieve the environment variable NAME and return a copy of it in a
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malloc()'ed buffer in *VALUE. If the environment variable is not
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set, return NULL in *VALUE. */
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#ifdef HAVE_GETENV_R
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#define INITIAL_GETENV_SIZE 32
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gpgme_error_t
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_gpgme_getenv (const char *name, char **value)
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{
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size_t len = INITIAL_GETENV_SIZE;
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char *env_value;
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env_value = malloc (len);
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while (1)
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{
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*value = env_value;
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if (!env_value)
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return gpg_error_from_syserror ();
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if (getenv_r (name, env_value, len) == 0)
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break;
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if (errno == ERANGE)
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{
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len *= 2;
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env_value = realloc (env_value, len);
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}
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else
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{
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int saved = errno;
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free (env_value);
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*value = NULL;
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if (errno == ENOENT)
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return 0;
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else
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return gpg_error_from_errno (saved);
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}
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}
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return 0;
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}
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#else
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#ifndef HAVE_THREAD_SAFE_GETENV
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GPGRT_LOCK_DEFINE (environ_lock);
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#endif
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gpgme_error_t
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_gpgme_getenv (const char *name, char **value)
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{
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char *env_value;
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gpgme_error_t err = 0;
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#ifndef HAVE_THREAD_SAFE_GETENV
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gpg_err_code_t rc;
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rc= gpgrt_lock_lock (&environ_lock);
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if (rc)
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{
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err = gpg_error (rc);
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goto leave;
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}
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#endif
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env_value = getenv (name);
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if (!env_value)
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*value = NULL;
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else
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{
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*value = strdup (env_value);
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if (!*value)
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err = gpg_error_from_syserror ();
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}
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#ifndef HAVE_THREAD_SAFE_GETENV
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rc = gpgrt_lock_unlock (&environ_lock);
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if (rc)
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err = gpg_error (rc);
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leave:
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#endif
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return err;
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}
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#endif
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