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/* getenv.c - get environment variable value from the shell's variable
list. */
/* Copyright (C) 1997-2002 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash 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 of the License, or
(at your option) any later version.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#if defined (CAN_REDEFINE_GETENV)
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#include <bashansi.h>
#include <errno.h>
#include <shell.h>
#ifndef errno
extern int errno;
#endif
extern char **environ;
/* We supply our own version of getenv () because we want library
routines to get the changed values of exported variables. */
/* The NeXT C library has getenv () defined and used in the same file.
This screws our scheme. However, Bash will run on the NeXT using
the C library getenv (), since right now the only environment variable
that we care about is HOME, and that is already defined. */
static char *last_tempenv_value = (char *)NULL;
char *
getenv (name)
const char *name;
{
SHELL_VAR *var;
if (name == 0 || *name == '\0')
return ((char *)NULL);
var = find_tempenv_variable ((char *)name);
if (var)
{
FREE (last_tempenv_value);
last_tempenv_value = value_cell (var) ? savestring (value_cell (var)) : (char *)NULL;
return (last_tempenv_value);
}
else if (shell_variables)
{
var = find_variable ((char *)name);
if (var && exported_p (var))
return (value_cell (var));
}
else
{
register int i, len;
/* In some cases, s5r3 invokes getenv() before main(); BSD systems
using gprof also exhibit this behavior. This means that
shell_variables will be 0 when this is invoked. We look up the
variable in the real environment in that case. */
for (i = 0, len = strlen (name); environ[i]; i++)
{
if ((STREQN (environ[i], name, len)) && (environ[i][len] == '='))
return (environ[i] + len + 1);
}
}
return ((char *)NULL);
}
/* Some versions of Unix use _getenv instead. */
char *
_getenv (name)
const char *name;
{
return (getenv (name));
}
/* SUSv3 says argument is a `char *'; BSD implementations disagree */
int
putenv (str)
#ifndef HAVE_STD_PUTENV
const char *str;
#else
char *str;
#endif
{
SHELL_VAR *var;
char *name, *value;
int offset;
if (str == 0 || *str == '\0')
{
errno = EINVAL;
return -1;
}
offset = assignment (str, 0);
if (str[offset] != '=')
{
errno = EINVAL;
return -1;
}
name = savestring (str);
name[offset] = 0;
value = name + offset + 1;
/* XXX - should we worry about readonly here? */
var = bind_variable (name, value, 0);
if (var == 0)
{
errno = EINVAL;
return -1;
}
VUNSETATTR (var, att_invisible);
VSETATTR (var, att_exported);
return 0;
}
#if 0
int
_putenv (name)
#ifndef HAVE_STD_PUTENV
const char *name;
#else
char *name;
#endif
{
return putenv (name);
}
#endif
int
setenv (name, value, rewrite)
const char *name;
const char *value;
int rewrite;
{
SHELL_VAR *var;
char *v;
if (name == 0 || *name == '\0' || strchr (name, '=') != 0)
{
errno = EINVAL;
return -1;
}
var = 0;
v = (char *)value; /* some compilers need explicit cast */
/* XXX - should we worry about readonly here? */
if (rewrite == 0)
var = find_variable (name);
if (var == 0)
var = bind_variable (name, v, 0);
if (var == 0)
return -1;
VUNSETATTR (var, att_invisible);
VSETATTR (var, att_exported);
return 0;
}
#if 0
int
_setenv (name, value, rewrite)
const char *name;
const char *value;
int rewrite;
{
return setenv (name, value, rewrite);
}
#endif
/* SUSv3 says unsetenv returns int; existing implementations (BSD) disagree. */
#ifdef HAVE_STD_UNSETENV
#define UNSETENV_RETURN(N) return(N)
#define UNSETENV_RETTYPE int
#else
#define UNSETENV_RETURN(N) return
#define UNSETENV_RETTYPE void
#endif
UNSETENV_RETTYPE
unsetenv (name)
const char *name;
{
if (name == 0 || *name == '\0' || strchr (name, '=') != 0)
{
errno = EINVAL;
UNSETENV_RETURN(-1);
}
/* XXX - should we just remove the export attribute here? */
#if 1
unbind_variable (name);
#else
SHELL_VAR *v;
v = find_variable (name);
if (v)
VUNSETATTR (v, att_exported);
#endif
UNSETENV_RETURN(0);
}
#endif /* CAN_REDEFINE_GETENV */
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