1
0
mirror of git://git.gnupg.org/gnupg.git synced 2024-12-23 10:29:58 +01:00
gnupg/gl/setenv.c
Werner Koch 096e7457ec Change all quotes in strings and comments to the new GNU standard.
The asymmetric quotes used by GNU in the past (`...') don't render
nicely on modern systems.  We now use two \x27 characters ('...').

The proper solution would be to use the correct Unicode symmetric
quotes here.  However this has the disadvantage that the system
requires Unicode support.  We don't want that today.  If Unicode is
available a generated po file can be used to output proper quotes.  A
simple sed script like the one used for en@quote is sufficient to
change them.

The changes have been done by applying

  sed -i "s/\`\([^'\`]*\)'/'\1'/g"

to most files and fixing obvious problems by hand.  The msgid strings in
the po files were fixed with a similar command.
2012-06-05 19:29:22 +02:00

333 lines
8.0 KiB
C

/* Copyright (C) 1992,1995-1999,2000-2003,2005,2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, see <http://www.gnu.org/licenses/>. */
#if !_LIBC
# include <config.h>
#endif
#include <alloca.h>
#include <errno.h>
#ifndef __set_errno
# ifdef HAVE_W32CE_SYSTEM
# include <gpg-error.h>
# define __set_errno(ev) gpg_err_set_errno ((ev))
# else
# define __set_errno(ev) ((errno) = (ev))
# endif
#endif
#include <stdlib.h>
#include <string.h>
#if _LIBC || HAVE_UNISTD_H
# include <unistd.h>
#endif
#if !_LIBC
# include "allocsa.h"
#endif
#if !_LIBC
# define __environ environ
# ifndef HAVE_ENVIRON_DECL
extern char **environ;
# endif
#endif
#if _LIBC
/* This lock protects against simultaneous modifications of 'environ'. */
# include <bits/libc-lock.h>
__libc_lock_define_initialized (static, envlock)
# define LOCK __libc_lock_lock (envlock)
# define UNLOCK __libc_lock_unlock (envlock)
#else
# define LOCK
# define UNLOCK
#endif
/* In the GNU C library we must keep the namespace clean. */
#ifdef _LIBC
# define setenv __setenv
# define clearenv __clearenv
# define tfind __tfind
# define tsearch __tsearch
#endif
/* In the GNU C library implementation we try to be more clever and
allow arbitrarily many changes of the environment given that the used
values are from a small set. Outside glibc this will eat up all
memory after a while. */
#if defined _LIBC || (defined HAVE_SEARCH_H && defined HAVE_TSEARCH \
&& defined __GNUC__)
# define USE_TSEARCH 1
# include <search.h>
typedef int (*compar_fn_t) (const void *, const void *);
/* This is a pointer to the root of the search tree with the known
values. */
static void *known_values;
# define KNOWN_VALUE(Str) \
({ \
void *value = tfind (Str, &known_values, (compar_fn_t) strcmp); \
value != NULL ? *(char **) value : NULL; \
})
# define STORE_VALUE(Str) \
tsearch (Str, &known_values, (compar_fn_t) strcmp)
#else
# undef USE_TSEARCH
# define KNOWN_VALUE(Str) NULL
# define STORE_VALUE(Str) do { } while (0)
#endif
/* If this variable is not a null pointer we allocated the current
environment. */
static char **last_environ;
/* This function is used by 'setenv' and 'putenv'. The difference between
the two functions is that for the former must create a new string which
is then placed in the environment, while the argument of 'putenv'
must be used directly. This is all complicated by the fact that we try
to reuse values once generated for a 'setenv' call since we can never
free the strings. */
int
__add_to_environ (const char *name, const char *value, const char *combined,
int replace)
{
register char **ep;
register size_t size;
const size_t namelen = strlen (name);
const size_t vallen = value != NULL ? strlen (value) + 1 : 0;
LOCK;
/* We have to get the pointer now that we have the lock and not earlier
since another thread might have created a new environment. */
ep = __environ;
size = 0;
if (ep != NULL)
{
for (; *ep != NULL; ++ep)
if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
break;
else
++size;
}
if (ep == NULL || *ep == NULL)
{
char **new_environ;
#ifdef USE_TSEARCH
char *new_value;
#endif
/* We allocated this space; we can extend it. */
new_environ =
(char **) (last_environ == NULL
? malloc ((size + 2) * sizeof (char *))
: realloc (last_environ, (size + 2) * sizeof (char *)));
if (new_environ == NULL)
{
UNLOCK;
return -1;
}
/* If the whole entry is given add it. */
if (combined != NULL)
/* We must not add the string to the search tree since it belongs
to the user. */
new_environ[size] = (char *) combined;
else
{
/* See whether the value is already known. */
#ifdef USE_TSEARCH
# ifdef _LIBC
new_value = (char *) alloca (namelen + 1 + vallen);
__mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
value, vallen);
# else
new_value = (char *) allocsa (namelen + 1 + vallen);
if (new_value == NULL)
{
__set_errno (ENOMEM);
UNLOCK;
return -1;
}
memcpy (new_value, name, namelen);
new_value[namelen] = '=';
memcpy (&new_value[namelen + 1], value, vallen);
# endif
new_environ[size] = KNOWN_VALUE (new_value);
if (new_environ[size] == NULL)
#endif
{
new_environ[size] = (char *) malloc (namelen + 1 + vallen);
if (new_environ[size] == NULL)
{
#if defined USE_TSEARCH && !defined _LIBC
freesa (new_value);
#endif
__set_errno (ENOMEM);
UNLOCK;
return -1;
}
#ifdef USE_TSEARCH
memcpy (new_environ[size], new_value, namelen + 1 + vallen);
#else
memcpy (new_environ[size], name, namelen);
new_environ[size][namelen] = '=';
memcpy (&new_environ[size][namelen + 1], value, vallen);
#endif
/* And save the value now. We cannot do this when we remove
the string since then we cannot decide whether it is a
user string or not. */
STORE_VALUE (new_environ[size]);
}
#if defined USE_TSEARCH && !defined _LIBC
freesa (new_value);
#endif
}
if (__environ != last_environ)
memcpy ((char *) new_environ, (char *) __environ,
size * sizeof (char *));
new_environ[size + 1] = NULL;
last_environ = __environ = new_environ;
}
else if (replace)
{
char *np;
/* Use the user string if given. */
if (combined != NULL)
np = (char *) combined;
else
{
#ifdef USE_TSEARCH
char *new_value;
# ifdef _LIBC
new_value = alloca (namelen + 1 + vallen);
__mempcpy (__mempcpy (__mempcpy (new_value, name, namelen), "=", 1),
value, vallen);
# else
new_value = allocsa (namelen + 1 + vallen);
if (new_value == NULL)
{
__set_errno (ENOMEM);
UNLOCK;
return -1;
}
memcpy (new_value, name, namelen);
new_value[namelen] = '=';
memcpy (&new_value[namelen + 1], value, vallen);
# endif
np = KNOWN_VALUE (new_value);
if (np == NULL)
#endif
{
np = malloc (namelen + 1 + vallen);
if (np == NULL)
{
#if defined USE_TSEARCH && !defined _LIBC
freesa (new_value);
#endif
__set_errno (ENOMEM);
UNLOCK;
return -1;
}
#ifdef USE_TSEARCH
memcpy (np, new_value, namelen + 1 + vallen);
#else
memcpy (np, name, namelen);
np[namelen] = '=';
memcpy (&np[namelen + 1], value, vallen);
#endif
/* And remember the value. */
STORE_VALUE (np);
}
#if defined USE_TSEARCH && !defined _LIBC
freesa (new_value);
#endif
}
*ep = np;
}
UNLOCK;
return 0;
}
int
setenv (const char *name, const char *value, int replace)
{
return __add_to_environ (name, value, NULL, replace);
}
/* The 'clearenv' was planned to be added to POSIX.1 but probably
never made it. Nevertheless the POSIX.9 standard (POSIX bindings
for Fortran 77) requires this function. */
int
clearenv (void)
{
LOCK;
if (__environ == last_environ && __environ != NULL)
{
/* We allocated this environment so we can free it. */
free (__environ);
last_environ = NULL;
}
/* Clear the environment pointer removes the whole environment. */
__environ = NULL;
UNLOCK;
return 0;
}
#ifdef _LIBC
static void
free_mem (void)
{
/* Remove all traces. */
clearenv ();
/* Now remove the search tree. */
__tdestroy (known_values, free);
known_values = NULL;
}
text_set_element (__libc_subfreeres, free_mem);
# undef setenv
# undef clearenv
weak_alias (__setenv, setenv)
weak_alias (__clearenv, clearenv)
#endif