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/* Copyright (C) 1992, 1995, 1996, 1997, 2000 Free Software Foundation, Inc. |
/* Copyright (C) 1992, 1995, 2000 Free Software Foundation, Inc. |
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This file is part of the GNU C Library. |
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The GNU C Library is free software; you can redistribute it and/or |
NOTE: The canonical source of this file is maintained with the GNU C Library. |
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modify it under the terms of the GNU Library General Public License as |
Bugs can be reported to bug-glibc@prep.ai.mit.edu. |
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published by the Free Software Foundation; either version 2 of the |
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License, or (at your option) any later version. |
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The GNU C Library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Library General Public License for more details. |
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You should have received a copy of the GNU Library General Public |
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License along with the GNU C Library; see the file COPYING.LIB. If not, |
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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Boston, MA 02111-1307, USA. */ |
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#if HAVE_CONFIG_H |
This program is free software; you can redistribute it and/or modify it |
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under the terms of the GNU General Public License as published by the |
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Free Software Foundation; either version 2, or (at your option) any |
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later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
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USA. */ |
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#ifdef HAVE_CONFIG_H |
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# include <config.h> |
# include <config.h> |
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#endif |
#endif |
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#include <errno.h> |
#include <errno.h> |
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#if !_LIBC |
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# if !defined(errno) && !HAVE_DECL_ERRNO |
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extern int errno; |
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# endif |
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# define __set_errno(ev) ((errno) = (ev)) |
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#endif |
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#if _LIBC || HAVE_STDLIB_H |
#if _LIBC || HAVE_STDLIB_H |
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# include <stdlib.h> |
# include <stdlib.h> |
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# include <unistd.h> |
# include <unistd.h> |
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#endif |
#endif |
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#if _LIBC - 0 == 0 |
#ifndef HAVE_GNU_LD |
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# define __environ environ |
# define __environ environ |
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# if !HAVE_DECL_ENVIRON |
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extern char **environ; |
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# endif |
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#endif |
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#if _LIBC - 0 |
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/* This lock protects against simultaneous modifications of `environ'. */ |
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# include <libc-lock.h> |
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__libc_lock_define_initialized (static, envlock) |
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# define LOCK __libc_lock_lock (envlock) |
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# define UNLOCK __libc_lock_unlock (envlock) |
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#else |
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# define LOCK |
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# define UNLOCK |
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#endif |
#endif |
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/* If this variable is not a null pointer we allocated the current |
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environment. */ |
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static char **last_environ; |
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int |
int |
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setenv (const char *name, const char *value, int replace) |
setenv (name, value, replace) |
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const char *name; |
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const char *value; |
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int replace; |
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{ |
{ |
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register char **ep; |
register char **ep; |
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register size_t size; |
register size_t size; |
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const size_t namelen = strlen (name); |
const size_t namelen = strlen (name); |
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const size_t vallen = strlen (value) + 1; |
const size_t vallen = strlen (value) + 1; |
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LOCK; |
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size = 0; |
size = 0; |
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if (__environ != NULL) |
for (ep = __environ; *ep != NULL; ++ep) |
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for (ep = __environ; *ep != NULL; ++ep) |
if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=') |
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if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=') |
break; |
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break; |
else |
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else |
++size; |
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++size; |
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if (__environ == NULL || *ep == NULL) |
if (*ep == NULL) |
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{ |
{ |
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static char **last_environ; |
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char **new_environ; |
char **new_environ; |
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if (__environ == last_environ && __environ != NULL) |
if (__environ == last_environ) |
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/* We allocated this space; we can extend it. */ |
/* We allocated this space; we can extend it. */ |
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new_environ = (char **) realloc (last_environ, |
new_environ = (char **) realloc (last_environ, |
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(size + 2) * sizeof (char *)); |
(size + 2) * sizeof (char *)); |
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new_environ = (char **) malloc ((size + 2) * sizeof (char *)); |
new_environ = (char **) malloc ((size + 2) * sizeof (char *)); |
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if (new_environ == NULL) |
if (new_environ == NULL) |
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{ |
return -1; |
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UNLOCK; |
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return -1; |
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} |
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new_environ[size] = malloc (namelen + 1 + vallen); |
new_environ[size] = malloc (namelen + 1 + vallen); |
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if (new_environ[size] == NULL) |
if (new_environ[size] == NULL) |
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{ |
{ |
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free ((char *) new_environ); |
free ((char *) new_environ); |
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__set_errno (ENOMEM); |
errno = ENOMEM; |
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UNLOCK; |
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return -1; |
return -1; |
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} |
} |
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/* The existing string is too short; malloc a new one. */ |
/* The existing string is too short; malloc a new one. */ |
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char *new = malloc (namelen + 1 + vallen); |
char *new = malloc (namelen + 1 + vallen); |
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if (new == NULL) |
if (new == NULL) |
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{ |
return -1; |
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UNLOCK; |
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return -1; |
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} |
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*ep = new; |
*ep = new; |
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} |
} |
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memcpy (*ep, name, namelen); |
memcpy (*ep, name, namelen); |
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memcpy (&(*ep)[namelen + 1], value, vallen); |
memcpy (&(*ep)[namelen + 1], value, vallen); |
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} |
} |
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UNLOCK; |
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return 0; |
return 0; |
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} |
} |
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void |
void |
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unsetenv (const char *name) |
unsetenv (name) |
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const char *name; |
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{ |
{ |
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const size_t len = strlen (name); |
const size_t len = strlen (name); |
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char **ep; |
char **ep; |
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LOCK; |
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for (ep = __environ; *ep; ++ep) |
for (ep = __environ; *ep; ++ep) |
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if (!strncmp (*ep, name, len) && (*ep)[len] == '=') |
if (!strncmp (*ep, name, len) && (*ep)[len] == '=') |
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{ |
{ |
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while (*dp++); |
while (*dp++); |
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/* Continue the loop in case NAME appears again. */ |
/* Continue the loop in case NAME appears again. */ |
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} |
} |
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UNLOCK; |
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} |
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/* The `clearenv' was planned to be added to POSIX.1 but probably |
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never made it. Nevertheless the POSIX.9 standard (POSIX bindings |
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for Fortran 77) requires this function. */ |
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int |
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clearenv () |
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{ |
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LOCK; |
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if (__environ == last_environ && __environ != NULL) |
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{ |
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/* We allocated this environment so we can free it. */ |
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free (__environ); |
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last_environ = NULL; |
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} |
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/* Clear the environment pointer removes the whole environment. */ |
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__environ = NULL; |
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UNLOCK; |
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return 0; |
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} |
} |