1 /* -*- buffer-read-only: t -*- vi: set ro: */
2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
3 /* Copyright (C) 1992, 1995-2003, 2005-2010 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 /* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
24 optimizes away the name == NULL test below. */
25 #define _GL_ARG_NONNULL(params)
34 # define __set_errno(ev) ((errno) = (ev))
38 #if _LIBC || HAVE_UNISTD_H
46 #if _LIBC || !HAVE_SETENV
49 # define __environ environ
53 /* This lock protects against simultaneous modifications of `environ'. */
54 # include <bits/libc-lock.h>
55 __libc_lock_define_initialized (static, envlock)
56 # define LOCK __libc_lock_lock (envlock)
57 # define UNLOCK __libc_lock_unlock (envlock)
63 /* In the GNU C library we must keep the namespace clean. */
65 # define setenv __setenv
66 # define clearenv __clearenv
67 # define tfind __tfind
68 # define tsearch __tsearch
71 /* In the GNU C library implementation we try to be more clever and
72 allow arbitrarily many changes of the environment given that the used
73 values are from a small set. Outside glibc this will eat up all
74 memory after a while. */
75 #if defined _LIBC || (defined HAVE_SEARCH_H && defined HAVE_TSEARCH \
77 # define USE_TSEARCH 1
79 typedef int (*compar_fn_t) (const void *, const void *);
81 /* This is a pointer to the root of the search tree with the known
83 static void *known_values;
85 # define KNOWN_VALUE(Str) \
87 void *value = tfind (Str, &known_values, (compar_fn_t) strcmp); \
88 value != NULL ? *(char **) value : NULL; \
90 # define STORE_VALUE(Str) \
91 tsearch (Str, &known_values, (compar_fn_t) strcmp)
96 # define KNOWN_VALUE(Str) NULL
97 # define STORE_VALUE(Str) do { } while (0)
102 /* If this variable is not a null pointer we allocated the current
104 static char **last_environ;
107 /* This function is used by `setenv' and `putenv'. The difference between
108 the two functions is that for the former must create a new string which
109 is then placed in the environment, while the argument of `putenv'
110 must be used directly. This is all complicated by the fact that we try
111 to reuse values once generated for a `setenv' call since we can never
114 __add_to_environ (const char *name, const char *value, const char *combined,
118 register size_t size;
119 const size_t namelen = strlen (name);
120 const size_t vallen = value != NULL ? strlen (value) + 1 : 0;
124 /* We have to get the pointer now that we have the lock and not earlier
125 since another thread might have created a new environment. */
131 for (; *ep != NULL; ++ep)
132 if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
138 if (ep == NULL || *ep == NULL)
145 /* We allocated this space; we can extend it. */
147 (char **) (last_environ == NULL
148 ? malloc ((size + 2) * sizeof (char *))
149 : realloc (last_environ, (size + 2) * sizeof (char *)));
150 if (new_environ == NULL)
156 /* If the whole entry is given add it. */
157 if (combined != NULL)
158 /* We must not add the string to the search tree since it belongs
160 new_environ[size] = (char *) combined;
163 /* See whether the value is already known. */
166 new_value = (char *) alloca (namelen + 1 + vallen);
167 __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
170 new_value = (char *) malloca (namelen + 1 + vallen);
171 if (new_value == NULL)
173 __set_errno (ENOMEM);
177 memcpy (new_value, name, namelen);
178 new_value[namelen] = '=';
179 memcpy (&new_value[namelen + 1], value, vallen);
182 new_environ[size] = KNOWN_VALUE (new_value);
183 if (new_environ[size] == NULL)
186 new_environ[size] = (char *) malloc (namelen + 1 + vallen);
187 if (new_environ[size] == NULL)
189 #if defined USE_TSEARCH && !defined _LIBC
192 __set_errno (ENOMEM);
198 memcpy (new_environ[size], new_value, namelen + 1 + vallen);
200 memcpy (new_environ[size], name, namelen);
201 new_environ[size][namelen] = '=';
202 memcpy (&new_environ[size][namelen + 1], value, vallen);
204 /* And save the value now. We cannot do this when we remove
205 the string since then we cannot decide whether it is a
206 user string or not. */
207 STORE_VALUE (new_environ[size]);
209 #if defined USE_TSEARCH && !defined _LIBC
214 if (__environ != last_environ)
215 memcpy ((char *) new_environ, (char *) __environ,
216 size * sizeof (char *));
218 new_environ[size + 1] = NULL;
220 last_environ = __environ = new_environ;
226 /* Use the user string if given. */
227 if (combined != NULL)
228 np = (char *) combined;
234 new_value = alloca (namelen + 1 + vallen);
235 __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
238 new_value = malloca (namelen + 1 + vallen);
239 if (new_value == NULL)
241 __set_errno (ENOMEM);
245 memcpy (new_value, name, namelen);
246 new_value[namelen] = '=';
247 memcpy (&new_value[namelen + 1], value, vallen);
250 np = KNOWN_VALUE (new_value);
254 np = malloc (namelen + 1 + vallen);
257 #if defined USE_TSEARCH && !defined _LIBC
260 __set_errno (ENOMEM);
266 memcpy (np, new_value, namelen + 1 + vallen);
268 memcpy (np, name, namelen);
270 memcpy (&np[namelen + 1], value, vallen);
272 /* And remember the value. */
275 #if defined USE_TSEARCH && !defined _LIBC
289 setenv (const char *name, const char *value, int replace)
291 if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
293 __set_errno (EINVAL);
297 return __add_to_environ (name, value, NULL, replace);
300 /* The `clearenv' was planned to be added to POSIX.1 but probably
301 never made it. Nevertheless the POSIX.9 standard (POSIX bindings
302 for Fortran 77) requires this function. */
308 if (__environ == last_environ && __environ != NULL)
310 /* We allocated this environment so we can free it. */
315 /* Clear the environment pointer removes the whole environment. */
327 /* Remove all traces. */
330 /* Now remove the search tree. */
331 __tdestroy (known_values, free);
334 text_set_element (__libc_subfreeres, free_mem);
339 weak_alias (__setenv, setenv)
340 weak_alias (__clearenv, clearenv)
343 #endif /* _LIBC || !HAVE_SETENV */
345 /* The rest of this file is called into use when replacing an existing
346 but buggy setenv. Known bugs include failure to diagnose invalid
347 name, and consuming a leading '=' from value. */
351 # define STREQ(a, b) (strcmp (a, b) == 0)
354 rpl_setenv (const char *name, const char *value, int replace)
357 if (!name || !*name || strchr (name, '='))
362 /* Call the real setenv even if replace is 0, in case implementation
363 has underlying data to update, such as when environ changes. */
364 result = setenv (name, value, replace);
365 if (result == 0 && replace && *value == '=')
367 char *tmp = getenv (name);
368 if (!STREQ (tmp, value))
371 size_t len = strlen (value);
372 tmp = malloca (len + 2);
373 /* Since leading '=' is eaten, double it up. */
375 memcpy (tmp + 1, value, len + 1);
376 result = setenv (name, tmp, replace);
385 #endif /* HAVE_SETENV */