1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 2005-2014, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 3, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. *
18 * As a special exception under Section 7 of GPL version 3, you are granted *
19 * additional permissions described in the GCC Runtime Library Exception, *
20 * version 3.1, as published by the Free Software Foundation. *
22 * You should have received a copy of the GNU General Public License and *
23 * a copy of the GCC Runtime Library Exception along with this program; *
24 * see the files COPYING3 and COPYING.RUNTIME respectively. If not, see *
25 * <http://www.gnu.org/licenses/>. *
27 * GNAT was originally developed by the GNAT team at New York University. *
28 * Extensive contributions were provided by Ada Core Technologies Inc. *
30 ****************************************************************************/
43 #if defined (__MINGW32__)
47 #if defined (__vxworks)
49 /* On VxWorks 6 Real-Time process mode, environ is defined in unistd.h. */
51 #elif defined (VTHREADS)
52 /* VTHREADS mode applies to both VxWorks 653 and VxWorks MILS. The
53 inclusion of vThreadsData.h is necessary to workaround a bug with
54 envLib.h on VxWorks MILS and VxWorks 653. */
55 #include <vThreadsData.h>
58 /* This should work for kernel mode on both VxWorks 5 and VxWorks 6. */
61 /* In that mode environ is a macro which reference the following symbol.
62 As the symbol is not defined in any VxWorks include files we declare
64 extern char** ppGlobalEnviron
;
68 /* We don't have libiberty, so use malloc. */
69 #define xmalloc(S) malloc (S)
80 #include <vms/descrip.h>
86 __gnat_getenv (char *name
, int *len
, char **value
)
88 *value
= getenv (name
);
92 *len
= strlen (*value
);
97 /* VMS specific declarations for set_env_value. */
103 unsigned short len
, code
;
105 __char_ptr32 retlen_adr
;
111 __gnat_setenv (char *name
, char *value
)
114 struct dsc$descriptor_s name_desc
;
115 $
DESCRIPTOR (table_desc
, "LNM$PROCESS");
116 char *host_pathspec
= value
;
118 int num_dirs_in_pathspec
= 1;
122 name_desc
.dsc$w_length
= strlen (name
);
123 name_desc
.dsc$b_dtype
= DSC$K_DTYPE_T
;
124 name_desc
.dsc$b_class
= DSC$K_CLASS_S
;
125 name_desc
.dsc$a_pointer
= name
; /* ??? Danger, not 64bit safe. */
127 if (*host_pathspec
== 0)
130 status
= LIB$
DELETE_LOGICAL (&name_desc
, &table_desc
);
131 /* no need to check status; if the logical name is not
132 defined, that's fine. */
139 num_dirs_in_pathspec
++;
143 /* Alloca is guaranteed to be 32bit. */
144 ile_s
*ile_array
= alloca (sizeof (ile_s
) * (num_dirs_in_pathspec
+ 1));
145 char *copy_pathspec
= alloca (strlen (host_pathspec
) + 1);
148 strcpy (copy_pathspec
, host_pathspec
);
149 curr
= copy_pathspec
;
150 for (i
= 0; i
< num_dirs_in_pathspec
; i
++)
152 next
= strchr (curr
, ',');
154 next
= strchr (curr
, 0);
157 ile_array
[i
].len
= strlen (curr
);
159 /* Code 2 from lnmdef.h means it's a string. */
160 ile_array
[i
].code
= 2;
161 ile_array
[i
].adr
= curr
;
163 /* retlen_adr is ignored. */
164 ile_array
[i
].retlen_adr
= 0;
168 /* Terminating item must be zero. */
169 ile_array
[i
].len
= 0;
170 ile_array
[i
].code
= 0;
171 ile_array
[i
].adr
= 0;
172 ile_array
[i
].retlen_adr
= 0;
174 status
= LIB$
SET_LOGICAL (&name_desc
, 0, &table_desc
, 0, ile_array
);
175 if ((status
& 1) != 1)
179 #elif (defined (__vxworks) && defined (__RTP__)) || defined (__APPLE__)
180 setenv (name
, value
, 1);
183 size_t size
= strlen (name
) + strlen (value
) + 2;
186 expression
= (char *) xmalloc (size
* sizeof (char));
188 sprintf (expression
, "%s=%s", name
, value
);
190 #if (defined (__FreeBSD__) && (__FreeBSD__ < 7)) \
191 || defined (__MINGW32__) \
192 ||(defined (__vxworks) && ! defined (__RTP__))
193 /* On some systems like FreeBSD 6.x and earlier, MacOS X and Windows,
194 putenv is making a copy of the expression string so we can free
195 it after the call to putenv */
202 __gnat_environ (void)
204 #if defined (VMS) || defined (RTX)
205 /* Not implemented */
207 #elif defined (__MINGW32__)
210 extern char **_environ
;
212 #elif ! (defined (__vxworks))
213 extern char **environ
;
220 void __gnat_unsetenv (char *name
)
223 /* Not implemented */
225 #elif defined (__hpux__) || defined (sun) \
226 || (defined (__vxworks) && ! defined (__RTP__)) \
227 || defined (_AIX) || defined (__Lynx__)
229 /* On Solaris and HP-UX there is no function to clear an environment
230 variable. So we look for the variable in the environ table and delete it
231 by setting the entry to NULL. This can clearly cause some memory leaks
232 but free cannot be used on this context as not all strings in the environ
233 have been allocated using malloc. To avoid this memory leak another
234 method can be used. It consists in forcing the reallocation of all the
235 strings in the environ table using malloc on the first call on the
236 functions related to environment variable management. The disadvantage
237 is that if a program makes a direct call to getenv the return string
238 may be deallocated at some point. */
239 /* Note that on AIX, unsetenv is not supported on 5.1 but it is on 5.3.
240 As we are still supporting AIX 5.1 we cannot use unsetenv */
241 char **env
= __gnat_environ ();
243 size_t size
= strlen (name
);
245 while (env
[index
] != NULL
) {
246 if (strlen (env
[index
]) > size
) {
247 if (strstr (env
[index
], name
) == env
[index
] &&
248 env
[index
][size
] == '=') {
249 #if defined (__vxworks) && ! defined (__RTP__)
250 /* on Vxworks we are sure that the string has been allocated using
254 while (env
[index
] != NULL
) {
255 env
[index
]=env
[index
+ 1];
263 #elif defined (__MINGW32__)
264 /* On Windows platform putenv ("key=") is equivalent to unsetenv (a
265 subsequent call to getenv ("key") will return NULL and not the "\0"
267 size_t size
= strlen (name
) + 2;
269 expression
= (char *) xmalloc (size
* sizeof (char));
271 sprintf (expression
, "%s=", name
);
279 void __gnat_clearenv (void)
282 /* not implemented */
284 #elif defined (sun) \
285 || (defined (__vxworks) && ! defined (__RTP__)) || defined (__Lynx__) \
286 || defined (__PikeOS__)
287 /* On Solaris, VxWorks (not RTPs), and Lynx there is no system
288 call to unset a variable or to clear the environment so set all
289 the entries in the environ table to NULL (see comment in
290 __gnat_unsetenv for more explanation). */
291 char **env
= __gnat_environ ();
294 while (env
[index
] != NULL
) {
298 #elif defined (__MINGW32__) || defined (__FreeBSD__) || defined (__APPLE__) \
299 || (defined (__vxworks) && defined (__RTP__)) || defined (__CYGWIN__) \
300 || defined (__NetBSD__) || defined (__OpenBSD__) || defined (__rtems__)
301 /* On Windows, FreeBSD and MacOS there is no function to clean all the
302 environment but there is a "clean" way to unset a variable. So go
303 through the environ table and call __gnat_unsetenv on all entries */
304 char **env
= __gnat_environ ();
307 while (env
[0] != NULL
) {
309 while (env
[0][size
] != '=')
311 /* create a string that contains "name" */
315 expression
= (char *) xmalloc (size
* sizeof (char));
316 strncpy (expression
, env
[0], size
);
317 expression
[size
- 1] = 0;
318 __gnat_unsetenv (expression
);