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/****************************************************************************
* *
* GNAT COMPILER COMPONENTS *
* *
* E N V *
* *
* C Implementation File *
* *
* Copyright (C) 2005-2020, Free Software Foundation, Inc. *
* *
* GNAT is free software; you can redistribute it and/or modify it under *
* terms of the GNU General Public License as published by the Free Soft- *
* ware Foundation; either version 3, or (at your option) any later ver- *
* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
* OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. *
* *
* As a special exception under Section 7 of GPL version 3, you are granted *
* additional permissions described in the GCC Runtime Library Exception, *
* version 3.1, as published by the Free Software Foundation. *
* *
* You should have received a copy of the GNU General Public License and *
* a copy of the GCC Runtime Library Exception along with this program; *
* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
* <http://www.gnu.org/licenses/>. *
* *
* GNAT was originally developed by the GNAT team at New York University. *
* Extensive contributions were provided by Ada Core Technologies Inc. *
* *
****************************************************************************/
#ifdef IN_RTS
# include "runtime.h"
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
/* We don't have libiberty, so use malloc. */
# define xmalloc(S) malloc (S)
#else /* IN_RTS */
# include "config.h"
# include "system.h"
#endif /* IN_RTS */
#if defined (__MINGW32__)
#include <stdlib.h>
#endif
#if defined (__APPLE__) \
&& !(defined (__arm__) \
|| defined (__arm64__) \
|| defined (__IOS_SIMULATOR__))
/* On Darwin, _NSGetEnviron must be used for shared libraries; but it is not
available on iOS (on device or on simulator). */
#include <crt_externs.h>
#endif
#if defined (__vxworks)
#include <vxWorks.h>
#include <version.h>
#if defined (__RTP__)
/* On VxWorks 6 Real-Time process mode, environ is defined in unistd.h. */
#include <unistd.h>
#elif defined (VTHREADS)
/* VTHREADS mode applies to both VxWorks 653 and VxWorks MILS. The
inclusion of vThreadsData.h is necessary to workaround a bug with
envLib.h on VxWorks MILS and VxWorks 653. */
#include <vThreadsData.h>
#include <envLib.h>
#elif (_WRS_VXWORKS_MAJOR <= 6)
#include <envLib.h>
/* In that mode the following symbol is not defined in any VxWorks
include files, prior to vxWorks 7, so we declare it as extern. */
extern char** ppGlobalEnviron;
#elif (_WRS_VXWORKS_MAJOR >= 7)
/* This should work for kernel mode on VxWorks 7.x. In 7.2 the tcb
is made private, so accessor functions must be used, in 7.0 it
is optional but there is no way to distinguish between 7.2
and 7.0 since the version.h header file was never updated. */
#include <envLib.h>
#include <taskLibCommon.h>
#endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
#ifdef VMS
#include <vms/descrip.h>
#endif
#include "env.h"
void
__gnat_getenv (char *name, int *len, char **value)
{
*value = getenv (name);
if (!*value)
*len = 0;
else
*len = strlen (*value);
return;
}
void
__gnat_setenv (char *name, char *value)
{
#if (defined (__vxworks) && defined (__RTP__)) || defined (__APPLE__)
setenv (name, value, 1);
#else
size_t size = strlen (name) + strlen (value) + 2;
char *expression;
expression = (char *) xmalloc (size * sizeof (char));
sprintf (expression, "%s=%s", name, value);
putenv (expression);
#if defined (__MINGW32__) || (defined (__vxworks) && ! defined (__RTP__))
/* On some systems like MacOS X and Windows, putenv is making a copy of the
expression string so we can free it after the call to putenv */
free (expression);
#endif
#endif
}
char **
__gnat_environ (void)
{
#if defined (__MINGW32__)
return _environ;
#elif defined (__sun__)
extern char **_environ;
return _environ;
#elif defined (__APPLE__) \
&& !(defined (__arm__) \
|| defined (__arm64__) \
|| defined (__IOS_SIMULATOR__))
return *_NSGetEnviron ();
#elif ! (defined (__vxworks))
extern char **environ;
return environ;
#else
#if defined (__RTP__) || defined (VTHREADS) || (_WRS_VXWORKS_MAJOR <= 6)
return environ;
#elif (_WRS_VXWORKS_MAJOR >= 7)
char **task_environ;
task_environ = envGet (taskIdSelf ());
if (task_environ == NULL)
return ppGlobalEnviron;
else
return task_environ;
#endif
#endif
}
void __gnat_unsetenv (char *name)
{
#if defined (__hpux__) || defined (__sun__) \
|| (defined (__vxworks) && ! defined (__RTP__)) \
|| defined (_AIX) || defined (__Lynx__)
/* On Solaris and HP-UX there is no function to clear an environment
variable. So we look for the variable in the environ table and delete it
by setting the entry to NULL. This can clearly cause some memory leaks
but free cannot be used on this context as not all strings in the environ
have been allocated using malloc. To avoid this memory leak another
method can be used. It consists in forcing the reallocation of all the
strings in the environ table using malloc on the first call on the
functions related to environment variable management. The disadvantage
is that if a program makes a direct call to getenv the return string
may be deallocated at some point. */
/* Note that on AIX, unsetenv is not supported on 5.1 but it is on 5.3.
As we are still supporting AIX 5.1 we cannot use unsetenv */
char **env = __gnat_environ ();
int index = 0;
size_t size = strlen (name);
while (env[index] != NULL) {
if (strlen (env[index]) > size) {
if (strstr (env[index], name) == env[index] &&
env[index][size] == '=') {
#if defined (__vxworks) && ! defined (__RTP__)
/* on Vxworks we are sure that the string has been allocated using
malloc */
free (env[index]);
#endif
while (env[index] != NULL) {
env[index]=env[index + 1];
index++;
}
} else
index++;
} else
index++;
}
#elif defined (__MINGW32__)
/* On Windows platform putenv ("key=") is equivalent to unsetenv (a
subsequent call to getenv ("key") will return NULL and not the "\0"
string */
size_t size = strlen (name) + 2;
char *expression;
expression = (char *) xmalloc (size * sizeof (char));
sprintf (expression, "%s=", name);
putenv (expression);
free (expression);
#else
unsetenv (name);
#endif
}
void __gnat_clearenv (void)
{
#if defined (__sun__) \
|| (defined (__vxworks) && ! defined (__RTP__)) || defined (__Lynx__) \
|| defined (__PikeOS__)
/* On Solaris, VxWorks (not RTPs), and Lynx there is no system
call to unset a variable or to clear the environment so set all
the entries in the environ table to NULL (see comment in
__gnat_unsetenv for more explanation). */
char **env = __gnat_environ ();
int index = 0;
while (env[index] != NULL) {
env[index]=NULL;
index++;
}
#elif defined (__MINGW32__) || defined (__FreeBSD__) || defined (__APPLE__) \
|| (defined (__vxworks) && defined (__RTP__)) || defined (__CYGWIN__) \
|| defined (__NetBSD__) || defined (__OpenBSD__) || defined (__rtems__) \
|| defined (__DragonFly__) || defined (__DJGPP__)
/* On Windows, FreeBSD and MacOS there is no function to clean all the
environment but there is a "clean" way to unset a variable. So go
through the environ table and call __gnat_unsetenv on all entries */
char **env = __gnat_environ ();
size_t size;
while (env[0] != NULL) {
size = 0;
while (env[0][size] != '=')
size++;
/* create a string that contains "name" */
size++;
{
char *expression;
expression = (char *) xmalloc (size * sizeof (char));
strncpy (expression, env[0], size);
expression[size - 1] = 0;
__gnat_unsetenv (expression);
free (expression);
}
}
#else
clearenv ();
#endif
}
#ifdef __cplusplus
}
#endif
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