1 /* -*- buffer-read-only: t -*- vi: set ro: */
2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
3 /* Copyright (C) 1992, 1995-2003, 2005-2011 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/>. */
20 # define _GL_USE_STDLIB_ALLOC 1
24 /* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
25 optimizes away the name == NULL test below. */
26 #define _GL_ARG_NONNULL(params)
35 # define __set_errno(ev) ((errno) = (ev))
39 #if _LIBC || HAVE_UNISTD_H
47 #if _LIBC || !HAVE_SETENV
50 # define __environ environ
54 /* This lock protects against simultaneous modifications of `environ'. */
55 # include <bits/libc-lock.h>
56 __libc_lock_define_initialized (static, envlock)
57 # define LOCK __libc_lock_lock (envlock)
58 # define UNLOCK __libc_lock_unlock (envlock)
64 /* In the GNU C library we must keep the namespace clean. */
66 # define setenv __setenv
67 # define clearenv __clearenv
68 # define tfind __tfind
69 # define tsearch __tsearch
72 /* In the GNU C library implementation we try to be more clever and
73 allow arbitrarily many changes of the environment given that the used
74 values are from a small set. Outside glibc this will eat up all
75 memory after a while. */
76 #if defined _LIBC || (defined HAVE_SEARCH_H && defined HAVE_TSEARCH \
78 # define USE_TSEARCH 1
80 typedef int (*compar_fn_t) (const void *, const void *);
82 /* This is a pointer to the root of the search tree with the known
84 static void *known_values;
86 # define KNOWN_VALUE(Str) \
88 void *value = tfind (Str, &known_values, (compar_fn_t) strcmp); \
89 value != NULL ? *(char **) value : NULL; \
91 # define STORE_VALUE(Str) \
92 tsearch (Str, &known_values, (compar_fn_t) strcmp)
97 # define KNOWN_VALUE(Str) NULL
98 # define STORE_VALUE(Str) do { } while (0)
103 /* If this variable is not a null pointer we allocated the current
105 static char **last_environ;
108 /* This function is used by `setenv' and `putenv'. The difference between
109 the two functions is that for the former must create a new string which
110 is then placed in the environment, while the argument of `putenv'
111 must be used directly. This is all complicated by the fact that we try
112 to reuse values once generated for a `setenv' call since we can never
115 __add_to_environ (const char *name, const char *value, const char *combined,
120 const size_t namelen = strlen (name);
121 const size_t vallen = value != NULL ? strlen (value) + 1 : 0;
125 /* We have to get the pointer now that we have the lock and not earlier
126 since another thread might have created a new environment. */
132 for (; *ep != NULL; ++ep)
133 if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
139 if (ep == NULL || *ep == NULL)
146 /* We allocated this space; we can extend it. */
148 (char **) (last_environ == NULL
149 ? malloc ((size + 2) * sizeof (char *))
150 : realloc (last_environ, (size + 2) * sizeof (char *)));
151 if (new_environ == NULL)
153 /* It's easier to set errno to ENOMEM than to rely on the
154 'malloc-posix' and 'realloc-posix' gnulib modules. */
155 __set_errno (ENOMEM);
160 /* If the whole entry is given add it. */
161 if (combined != NULL)
162 /* We must not add the string to the search tree since it belongs
164 new_environ[size] = (char *) combined;
167 /* See whether the value is already known. */
170 new_value = (char *) alloca (namelen + 1 + vallen);
171 __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
174 new_value = (char *) malloca (namelen + 1 + vallen);
175 if (new_value == NULL)
177 __set_errno (ENOMEM);
181 memcpy (new_value, name, namelen);
182 new_value[namelen] = '=';
183 memcpy (&new_value[namelen + 1], value, vallen);
186 new_environ[size] = KNOWN_VALUE (new_value);
187 if (new_environ[size] == NULL)
190 new_environ[size] = (char *) malloc (namelen + 1 + vallen);
191 if (new_environ[size] == NULL)
193 #if defined USE_TSEARCH && !defined _LIBC
196 __set_errno (ENOMEM);
202 memcpy (new_environ[size], new_value, namelen + 1 + vallen);
204 memcpy (new_environ[size], name, namelen);
205 new_environ[size][namelen] = '=';
206 memcpy (&new_environ[size][namelen + 1], value, vallen);
208 /* And save the value now. We cannot do this when we remove
209 the string since then we cannot decide whether it is a
210 user string or not. */
211 STORE_VALUE (new_environ[size]);
213 #if defined USE_TSEARCH && !defined _LIBC
218 if (__environ != last_environ)
219 memcpy ((char *) new_environ, (char *) __environ,
220 size * sizeof (char *));
222 new_environ[size + 1] = NULL;
224 last_environ = __environ = new_environ;
230 /* Use the user string if given. */
231 if (combined != NULL)
232 np = (char *) combined;
238 new_value = alloca (namelen + 1 + vallen);
239 __mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
242 new_value = malloca (namelen + 1 + vallen);
243 if (new_value == NULL)
245 __set_errno (ENOMEM);
249 memcpy (new_value, name, namelen);
250 new_value[namelen] = '=';
251 memcpy (&new_value[namelen + 1], value, vallen);
254 np = KNOWN_VALUE (new_value);
258 np = (char *) malloc (namelen + 1 + vallen);
261 #if defined USE_TSEARCH && !defined _LIBC
264 __set_errno (ENOMEM);
270 memcpy (np, new_value, namelen + 1 + vallen);
272 memcpy (np, name, namelen);
274 memcpy (&np[namelen + 1], value, vallen);
276 /* And remember the value. */
279 #if defined USE_TSEARCH && !defined _LIBC
293 setenv (const char *name, const char *value, int replace)
295 if (name == NULL || *name == '\0' || strchr (name, '=') != NULL)
297 __set_errno (EINVAL);
301 return __add_to_environ (name, value, NULL, replace);
304 /* The `clearenv' was planned to be added to POSIX.1 but probably
305 never made it. Nevertheless the POSIX.9 standard (POSIX bindings
306 for Fortran 77) requires this function. */
312 if (__environ == last_environ && __environ != NULL)
314 /* We allocated this environment so we can free it. */
319 /* Clear the environment pointer removes the whole environment. */
331 /* Remove all traces. */
334 /* Now remove the search tree. */
335 __tdestroy (known_values, free);
338 text_set_element (__libc_subfreeres, free_mem);
343 weak_alias (__setenv, setenv)
344 weak_alias (__clearenv, clearenv)
347 #endif /* _LIBC || !HAVE_SETENV */
349 /* The rest of this file is called into use when replacing an existing
350 but buggy setenv. Known bugs include failure to diagnose invalid
351 name, and consuming a leading '=' from value. */
355 # if !HAVE_DECL_SETENV
356 extern int setenv (const char *, const char *, int);
358 # define STREQ(a, b) (strcmp (a, b) == 0)
361 rpl_setenv (const char *name, const char *value, int replace)
364 if (!name || !*name || strchr (name, '='))
369 /* Call the real setenv even if replace is 0, in case implementation
370 has underlying data to update, such as when environ changes. */
371 result = setenv (name, value, replace);
372 if (result == 0 && replace && *value == '=')
374 char *tmp = getenv (name);
375 if (!STREQ (tmp, value))
378 size_t len = strlen (value);
379 tmp = malloca (len + 2);
380 /* Since leading '=' is eaten, double it up. */
382 memcpy (tmp + 1, value, len + 1);
383 result = setenv (name, tmp, replace);
392 #endif /* HAVE_SETENV */