1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 2005-2011, 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__)
55 #if defined (__MINGW32__)
59 #if defined (__vxworks)
61 /* On VxWorks 6 Real-Time process mode, environ is defined in unistd.h. */
63 #elif defined (VTHREADS)
64 /* VTHREADS mode applies to both VxWorks 653 and VxWorks MILS. The
65 inclusion of vThreadsData.h is necessary to workaround a bug with
66 envLib.h on VxWorks MILS and VxWorks 653. */
67 #include <vThreadsData.h>
70 /* This should work for kernel mode on both VxWorks 5 and VxWorks 6. */
73 /* In that mode environ is a macro which reference the following symbol.
74 As the symbol is not defined in any VxWorks include files we declare
76 extern char** ppGlobalEnviron;
80 /* We don't have libiberty, so use malloc. */
81 #define xmalloc(S) malloc (S)
87 #if defined (__APPLE__)
88 #include <crt_externs.h>
92 #include <vms/descrip.h>
98 __gnat_getenv (char *name, int *len, char **value)
100 *value = getenv (name);
104 *len = strlen (*value);
109 /* VMS specific declarations for set_env_value. */
113 static char *to_host_path_spec (char *);
117 unsigned short len, code;
119 __char_ptr32 retlen_adr;
125 __gnat_setenv (char *name, char *value)
128 struct dsc$descriptor_s name_desc;
129 $DESCRIPTOR (table_desc, "LNM$PROCESS");
130 char *host_pathspec = value;
132 int num_dirs_in_pathspec = 1;
136 name_desc.dsc$w_length = strlen (name);
137 name_desc.dsc$b_dtype = DSC$K_DTYPE_T;
138 name_desc.dsc$b_class = DSC$K_CLASS_S;
139 name_desc.dsc$a_pointer = name; /* ??? Danger, not 64bit safe. */
141 if (*host_pathspec == 0)
144 status = LIB$DELETE_LOGICAL (&name_desc, &table_desc);
145 /* no need to check status; if the logical name is not
146 defined, that's fine. */
153 num_dirs_in_pathspec++;
157 /* Alloca is guaranteed to be 32bit. */
158 ile_s *ile_array = alloca (sizeof (ile_s) * (num_dirs_in_pathspec + 1));
159 char *copy_pathspec = alloca (strlen (host_pathspec) + 1);
162 strcpy (copy_pathspec, host_pathspec);
163 curr = copy_pathspec;
164 for (i = 0; i < num_dirs_in_pathspec; i++)
166 next = strchr (curr, ',');
168 next = strchr (curr, 0);
171 ile_array[i].len = strlen (curr);
173 /* Code 2 from lnmdef.h means it's a string. */
174 ile_array[i].code = 2;
175 ile_array[i].adr = curr;
177 /* retlen_adr is ignored. */
178 ile_array[i].retlen_adr = 0;
182 /* Terminating item must be zero. */
183 ile_array[i].len = 0;
184 ile_array[i].code = 0;
185 ile_array[i].adr = 0;
186 ile_array[i].retlen_adr = 0;
188 status = LIB$SET_LOGICAL (&name_desc, 0, &table_desc, 0, ile_array);
189 if ((status & 1) != 1)
193 #elif (defined (__vxworks) && defined (__RTP__)) || defined (__APPLE__)
194 setenv (name, value, 1);
197 size_t size = strlen (name) + strlen (value) + 2;
200 expression = (char *) xmalloc (size * sizeof (char));
202 sprintf (expression, "%s=%s", name, value);
204 #if (defined (__FreeBSD__) && (__FreeBSD__ < 7)) \
205 || defined (__MINGW32__) \
206 ||(defined (__vxworks) && ! defined (__RTP__))
207 /* On some systems like FreeBSD 6.x and earlier, MacOS X and Windows,
208 putenv is making a copy of the expression string so we can free
209 it after the call to putenv */
216 __gnat_environ (void)
218 #if defined (VMS) || defined (RTX)
219 /* Not implemented */
221 #elif defined (__APPLE__)
222 char ***result = _NSGetEnviron ();
224 #elif defined (__MINGW32__)
227 extern char **_environ;
229 #elif ! (defined (__vxworks))
230 extern char **environ;
237 void __gnat_unsetenv (char *name) {
239 /* Not implemented */
241 #elif defined (__hpux__) || defined (sun) \
242 || (defined (__mips) && defined (__sgi)) \
243 || (defined (__vxworks) && ! defined (__RTP__)) \
244 || defined (_AIX) || defined (__Lynx__)
246 /* On Solaris, HP-UX and IRIX there is no function to clear an environment
247 variable. So we look for the variable in the environ table and delete it
248 by setting the entry to NULL. This can clearly cause some memory leaks
249 but free cannot be used on this context as not all strings in the environ
250 have been allocated using malloc. To avoid this memory leak another
251 method can be used. It consists in forcing the reallocation of all the
252 strings in the environ table using malloc on the first call on the
253 functions related to environment variable management. The disadvantage
254 is that if a program makes a direct call to getenv the return string
255 may be deallocated at some point. */
256 /* Note that on AIX, unsetenv is not supported on 5.1 but it is on 5.3.
257 As we are still supporting AIX 5.1 we cannot use unsetenv */
258 char **env = __gnat_environ ();
260 size_t size = strlen (name);
262 while (env[index] != NULL) {
263 if (strlen (env[index]) > size) {
264 if (strstr (env[index], name) == env[index] &&
265 env[index][size] == '=') {
266 #if defined (__vxworks) && ! defined (__RTP__)
267 /* on Vxworks we are sure that the string has been allocated using
271 while (env[index] != NULL) {
272 env[index]=env[index + 1];
280 #elif defined (__MINGW32__)
281 /* On Windows platform putenv ("key=") is equivalent to unsetenv (a
282 subsequent call to getenv ("key") will return NULL and not the "\0"
284 size_t size = strlen (name) + 2;
286 expression = (char *) xmalloc (size * sizeof (char));
288 sprintf (expression, "%s=", name);
296 void __gnat_clearenv (void) {
298 /* not implemented */
300 #elif defined (sun) || (defined (__mips) && defined (__sgi)) \
301 || (defined (__vxworks) && ! defined (__RTP__)) || defined (__Lynx__)
302 /* On Solaris, IRIX, VxWorks (not RTPs), and Lynx there is no system
303 call to unset a variable or to clear the environment so set all
304 the entries in the environ table to NULL (see comment in
305 __gnat_unsetenv for more explanation). */
306 char **env = __gnat_environ ();
309 while (env[index] != NULL) {
313 #elif defined (__MINGW32__) || defined (__FreeBSD__) || defined (__APPLE__) \
314 || (defined (__vxworks) && defined (__RTP__)) || defined (__CYGWIN__) \
315 || defined (__NetBSD__) || defined (__OpenBSD__) || defined (__rtems__)
316 /* On Windows, FreeBSD and MacOS there is no function to clean all the
317 environment but there is a "clean" way to unset a variable. So go
318 through the environ table and call __gnat_unsetenv on all entries */
319 char **env = __gnat_environ ();
322 while (env[0] != NULL) {
324 while (env[0][size] != '=')
326 /* create a string that contains "name" */
330 expression = (char *) xmalloc (size * sizeof (char));
331 strncpy (expression, env[0], size);
332 expression[size - 1] = 0;
333 __gnat_unsetenv (expression);