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. */
115 unsigned short len, code;
117 __char_ptr32 retlen_adr;
123 __gnat_setenv (char *name, char *value)
126 struct dsc$descriptor_s name_desc;
127 $DESCRIPTOR (table_desc, "LNM$PROCESS");
128 char *host_pathspec = value;
130 int num_dirs_in_pathspec = 1;
134 name_desc.dsc$w_length = strlen (name);
135 name_desc.dsc$b_dtype = DSC$K_DTYPE_T;
136 name_desc.dsc$b_class = DSC$K_CLASS_S;
137 name_desc.dsc$a_pointer = name; /* ??? Danger, not 64bit safe. */
139 if (*host_pathspec == 0)
142 status = LIB$DELETE_LOGICAL (&name_desc, &table_desc);
143 /* no need to check status; if the logical name is not
144 defined, that's fine. */
151 num_dirs_in_pathspec++;
155 /* Alloca is guaranteed to be 32bit. */
156 ile_s *ile_array = alloca (sizeof (ile_s) * (num_dirs_in_pathspec + 1));
157 char *copy_pathspec = alloca (strlen (host_pathspec) + 1);
160 strcpy (copy_pathspec, host_pathspec);
161 curr = copy_pathspec;
162 for (i = 0; i < num_dirs_in_pathspec; i++)
164 next = strchr (curr, ',');
166 next = strchr (curr, 0);
169 ile_array[i].len = strlen (curr);
171 /* Code 2 from lnmdef.h means it's a string. */
172 ile_array[i].code = 2;
173 ile_array[i].adr = curr;
175 /* retlen_adr is ignored. */
176 ile_array[i].retlen_adr = 0;
180 /* Terminating item must be zero. */
181 ile_array[i].len = 0;
182 ile_array[i].code = 0;
183 ile_array[i].adr = 0;
184 ile_array[i].retlen_adr = 0;
186 status = LIB$SET_LOGICAL (&name_desc, 0, &table_desc, 0, ile_array);
187 if ((status & 1) != 1)
191 #elif (defined (__vxworks) && defined (__RTP__)) || defined (__APPLE__)
192 setenv (name, value, 1);
195 size_t size = strlen (name) + strlen (value) + 2;
198 expression = (char *) xmalloc (size * sizeof (char));
200 sprintf (expression, "%s=%s", name, value);
202 #if (defined (__FreeBSD__) && (__FreeBSD__ < 7)) \
203 || defined (__MINGW32__) \
204 ||(defined (__vxworks) && ! defined (__RTP__))
205 /* On some systems like FreeBSD 6.x and earlier, MacOS X and Windows,
206 putenv is making a copy of the expression string so we can free
207 it after the call to putenv */
214 __gnat_environ (void)
216 #if defined (VMS) || defined (RTX)
217 /* Not implemented */
219 #elif defined (__APPLE__)
220 char ***result = _NSGetEnviron ();
222 #elif defined (__MINGW32__)
225 extern char **_environ;
227 #elif ! (defined (__vxworks))
228 extern char **environ;
235 void __gnat_unsetenv (char *name) {
237 /* Not implemented */
239 #elif defined (__hpux__) || defined (sun) \
240 || (defined (__mips) && defined (__sgi)) \
241 || (defined (__vxworks) && ! defined (__RTP__)) \
242 || defined (_AIX) || defined (__Lynx__)
244 /* On Solaris, HP-UX and IRIX there is no function to clear an environment
245 variable. So we look for the variable in the environ table and delete it
246 by setting the entry to NULL. This can clearly cause some memory leaks
247 but free cannot be used on this context as not all strings in the environ
248 have been allocated using malloc. To avoid this memory leak another
249 method can be used. It consists in forcing the reallocation of all the
250 strings in the environ table using malloc on the first call on the
251 functions related to environment variable management. The disadvantage
252 is that if a program makes a direct call to getenv the return string
253 may be deallocated at some point. */
254 /* Note that on AIX, unsetenv is not supported on 5.1 but it is on 5.3.
255 As we are still supporting AIX 5.1 we cannot use unsetenv */
256 char **env = __gnat_environ ();
258 size_t size = strlen (name);
260 while (env[index] != NULL) {
261 if (strlen (env[index]) > size) {
262 if (strstr (env[index], name) == env[index] &&
263 env[index][size] == '=') {
264 #if defined (__vxworks) && ! defined (__RTP__)
265 /* on Vxworks we are sure that the string has been allocated using
269 while (env[index] != NULL) {
270 env[index]=env[index + 1];
278 #elif defined (__MINGW32__)
279 /* On Windows platform putenv ("key=") is equivalent to unsetenv (a
280 subsequent call to getenv ("key") will return NULL and not the "\0"
282 size_t size = strlen (name) + 2;
284 expression = (char *) xmalloc (size * sizeof (char));
286 sprintf (expression, "%s=", name);
294 void __gnat_clearenv (void) {
296 /* not implemented */
298 #elif defined (sun) || (defined (__mips) && defined (__sgi)) \
299 || (defined (__vxworks) && ! defined (__RTP__)) || defined (__Lynx__)
300 /* On Solaris, IRIX, VxWorks (not RTPs), and Lynx there is no system
301 call to unset a variable or to clear the environment so set all
302 the entries in the environ table to NULL (see comment in
303 __gnat_unsetenv for more explanation). */
304 char **env = __gnat_environ ();
307 while (env[index] != NULL) {
311 #elif defined (__MINGW32__) || defined (__FreeBSD__) || defined (__APPLE__) \
312 || (defined (__vxworks) && defined (__RTP__)) || defined (__CYGWIN__) \
313 || defined (__NetBSD__) || defined (__OpenBSD__) || defined (__rtems__)
314 /* On Windows, FreeBSD and MacOS there is no function to clean all the
315 environment but there is a "clean" way to unset a variable. So go
316 through the environ table and call __gnat_unsetenv on all entries */
317 char **env = __gnat_environ ();
320 while (env[0] != NULL) {
322 while (env[0][size] != '=')
324 /* create a string that contains "name" */
328 expression = (char *) xmalloc (size * sizeof (char));
329 strncpy (expression, env[0], size);
330 expression[size - 1] = 0;
331 __gnat_unsetenv (expression);