1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 2005-2009, 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 ****************************************************************************/
32 /* Tru64 UNIX V4.0F <stdlib.h> declares unsetenv() only if AES_SOURCE (which
33 is plain broken, this should be _AES_SOURCE instead as everywhere else;
34 Tru64 UNIX V5.1B declares it only if _BSD. */
35 #if defined (__alpha__) && defined (__osf__)
51 #if defined (__MINGW32__)
55 #if defined (__vxworks) \
56 && ! (defined (__RTP__) || defined (__COREOS__) || defined (__VXWORKSMILS__))
58 extern char** ppGlobalEnviron;
61 /* We don't have libiberty, so use malloc. */
62 #define xmalloc(S) malloc (S)
68 #if defined (__APPLE__)
69 #include <crt_externs.h>
75 __gnat_getenv (char *name, int *len, char **value)
77 *value = getenv (name);
81 *len = strlen (*value);
86 /* VMS specific declarations for set_env_value. */
90 static char *to_host_path_spec (char *);
94 unsigned short len, mbz;
100 unsigned short len, code;
102 unsigned short *retlen_adr;
108 __gnat_setenv (char *name, char *value)
113 struct descriptor_s name_desc;
114 /* Put in JOB table for now, so that the project stuff at least works. */
115 struct descriptor_s table_desc = {7, 0, "LNM$JOB"};
116 char *host_pathspec = value;
118 int num_dirs_in_pathspec = 1;
122 name_desc.len = strlen (name);
124 name_desc.adr = name;
126 if (*host_pathspec == 0)
129 status = LIB$DELETE_LOGICAL (&name_desc, &table_desc);
130 /* no need to check status; if the logical name is not
131 defined, that's fine. */
138 num_dirs_in_pathspec++;
142 ile_s *ile_array = alloca (sizeof (ile_s) * (num_dirs_in_pathspec + 1));
143 char *copy_pathspec = alloca (strlen (host_pathspec) + 1);
146 strcpy (copy_pathspec, host_pathspec);
147 curr = copy_pathspec;
148 for (i = 0; i < num_dirs_in_pathspec; i++)
150 next = strchr (curr, ',');
152 next = strchr (curr, 0);
155 ile_array[i].len = strlen (curr);
157 /* Code 2 from lnmdef.h means it's a string. */
158 ile_array[i].code = 2;
159 ile_array[i].adr = curr;
161 /* retlen_adr is ignored. */
162 ile_array[i].retlen_adr = 0;
166 /* Terminating item must be zero. */
167 ile_array[i].len = 0;
168 ile_array[i].code = 0;
169 ile_array[i].adr = 0;
170 ile_array[i].retlen_adr = 0;
172 status = LIB$SET_LOGICAL (&name_desc, 0, &table_desc, 0, ile_array);
173 if ((status & 1) != 1)
177 #elif (defined (__vxworks) && defined (__RTP__)) || defined (__APPLE__)
178 setenv (name, value, 1);
181 size_t size = strlen (name) + strlen (value) + 2;
184 expression = (char *) xmalloc (size * sizeof (char));
186 sprintf (expression, "%s=%s", name, value);
188 #if (defined (__FreeBSD__) && (__FreeBSD__ < 7)) \
189 || defined (__MINGW32__) \
190 ||(defined (__vxworks) && ! defined (__RTP__))
191 /* On some systems like FreeBSD 6.x and earlier, MacOS X and Windows,
192 putenv is making a copy of the expression string so we can free
193 it after the call to putenv */
200 __gnat_environ (void)
202 #if defined (VMS) || defined (RTX) \
203 || (defined (VTHREADS) && ! defined (__VXWORKSMILS__))
204 /* Not implemented */
206 #elif defined (__APPLE__)
207 char ***result = _NSGetEnviron ();
209 #elif defined (__MINGW32__)
212 extern char **_environ;
215 #if ! (defined (__vxworks) \
216 && ! (defined (__RTP__) || defined (__COREOS__) \
217 || defined (__VXWORKSMILS__)))
218 /* in VxWorks kernel mode environ is macro and not a variable */
219 /* same thing on 653 in the CoreOS and for VxWorks MILS vThreads */
220 extern char **environ;
226 void __gnat_unsetenv (char *name) {
228 /* Not implemented */
230 #elif defined (__hpux__) || defined (sun) \
231 || (defined (__mips) && defined (__sgi)) \
232 || (defined (__vxworks) && ! defined (__RTP__)) \
233 || defined (_AIX) || defined (__Lynx__)
235 /* On Solaris, HP-UX and IRIX there is no function to clear an environment
236 variable. So we look for the variable in the environ table and delete it
237 by setting the entry to NULL. This can clearly cause some memory leaks
238 but free cannot be used on this context as not all strings in the environ
239 have been allocated using malloc. To avoid this memory leak another
240 method can be used. It consists in forcing the reallocation of all the
241 strings in the environ table using malloc on the first call on the
242 functions related to environment variable management. The disadvantage
243 is that if a program makes a direct call to getenv the return string
244 may be deallocated at some point. */
245 /* Note that on AIX, unsetenv is not supported on 5.1 but it is on 5.3.
246 As we are still supporting AIX 5.1 we cannot use unsetenv */
247 char **env = __gnat_environ ();
249 size_t size = strlen (name);
251 while (env[index] != NULL) {
252 if (strlen (env[index]) > size) {
253 if (strstr (env[index], name) == env[index] &&
254 env[index][size] == '=') {
255 #if defined (__vxworks) && ! defined (__RTP__)
256 /* on Vxworks we are sure that the string has been allocated using
260 while (env[index] != NULL) {
261 env[index]=env[index + 1];
269 #elif defined (__MINGW32__)
270 /* On Windows platform putenv ("key=") is equivalent to unsetenv (a
271 subsequent call to getenv ("key") will return NULL and not the "\0"
273 size_t size = strlen (name) + 2;
275 expression = (char *) xmalloc (size * sizeof (char));
277 sprintf (expression, "%s=", name);
285 void __gnat_clearenv (void) {
287 /* not implemented */
289 #elif defined (sun) || (defined (__mips) && defined (__sgi)) \
290 || (defined (__vxworks) && ! defined (__RTP__)) || defined (__Lynx__)
291 /* On Solaris, IRIX, VxWorks (not RTPs), and Lynx there is no system
292 call to unset a variable or to clear the environment so set all
293 the entries in the environ table to NULL (see comment in
294 __gnat_unsetenv for more explanation). */
295 char **env = __gnat_environ ();
298 while (env[index] != NULL) {
302 #elif defined (__MINGW32__) || defined (__FreeBSD__) || defined (__APPLE__) \
303 || (defined (__vxworks) && defined (__RTP__)) || defined (__CYGWIN__) \
304 || defined (__NetBSD__) || defined (__OpenBSD__) || defined (__rtems__)
305 /* On Windows, FreeBSD and MacOS there is no function to clean all the
306 environment but there is a "clean" way to unset a variable. So go
307 through the environ table and call __gnat_unsetenv on all entries */
308 char **env = __gnat_environ ();
311 while (env[0] != NULL) {
313 while (env[0][size] != '=')
315 /* create a string that contains "name" */
318 char expression[size];
319 strncpy (expression, env[0], size);
320 expression[size - 1] = 0;
321 __gnat_unsetenv (expression);