1 /* -*- buffer-read-only: t -*- vi: set ro: */
2 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
3 /* Copyright (C) 1992, 1995-2003, 2005-2014 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 /* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
21 optimizes away the name == NULL test below. */
22 # define _GL_ARG_NONNULL(params)
24 # define _GL_USE_STDLIB_ALLOC 1
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 */