mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2025-01-16 17:19:41 +00:00
317 lines
7.6 KiB
C
317 lines
7.6 KiB
C
/* Environment-hacking for GNU Emacs subprocess
|
||
Copyright (C) 1986 Free Software Foundation, Inc.
|
||
|
||
This file is part of GNU Emacs.
|
||
|
||
GNU Emacs 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 1, or (at your option)
|
||
any later version.
|
||
|
||
GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
|
||
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
|
||
#include "config.h"
|
||
#include "lisp.h"
|
||
|
||
#ifdef MAINTAIN_ENVIRONMENT
|
||
|
||
#ifdef VMS
|
||
you lose -- this is un*x-only
|
||
#endif
|
||
|
||
/* alist of (name-string . value-string) */
|
||
Lisp_Object Venvironment_alist;
|
||
extern char **environ;
|
||
|
||
void
|
||
set_environment_alist (str, val)
|
||
register Lisp_Object str, val;
|
||
{
|
||
register Lisp_Object tem;
|
||
|
||
tem = Fassoc (str, Venvironment_alist);
|
||
if (NULL (tem))
|
||
if (NULL (val))
|
||
;
|
||
else
|
||
Venvironment_alist = Fcons (Fcons (str, val), Venvironment_alist);
|
||
else
|
||
if (NULL (val))
|
||
Venvironment_alist = Fdelq (tem, Venvironment_alist);
|
||
else
|
||
XCONS (tem)->cdr = val;
|
||
}
|
||
|
||
|
||
|
||
static void
|
||
initialize_environment_alist ()
|
||
{
|
||
register unsigned char **e, *s;
|
||
extern char *index ();
|
||
|
||
for (e = (unsigned char **) environ; *e; e++)
|
||
{
|
||
s = (unsigned char *) index (*e, '=');
|
||
if (s)
|
||
set_environment_alist (make_string (*e, s - *e),
|
||
build_string (s + 1));
|
||
}
|
||
}
|
||
|
||
|
||
unsigned char *
|
||
getenv_1 (str, ephemeral)
|
||
register unsigned char *str;
|
||
int ephemeral; /* if ephmeral, don't need to gc-proof */
|
||
{
|
||
register Lisp_Object env;
|
||
int len = strlen (str);
|
||
|
||
for (env = Venvironment_alist; CONSP (env); env = XCONS (env)->cdr)
|
||
{
|
||
register Lisp_Object car = XCONS (env)->car;
|
||
register Lisp_Object tem = XCONS (car)->car;
|
||
|
||
if ((len == XSTRING (tem)->size) &&
|
||
(!bcmp (str, XSTRING (tem)->data, len)))
|
||
{
|
||
/* Found it in the lisp environment */
|
||
tem = XCONS (car)->cdr;
|
||
if (ephemeral)
|
||
/* Caller promises that gc won't make him lose */
|
||
return XSTRING (tem)->data;
|
||
else
|
||
{
|
||
register unsigned char **e;
|
||
unsigned char *s;
|
||
int ll = XSTRING (tem)->size;
|
||
|
||
/* Look for element in the original unix environment */
|
||
for (e = (unsigned char **) environ; *e; e++)
|
||
if (!bcmp (str, *e, len) && *(*e + len) == '=')
|
||
{
|
||
s = *e + len + 1;
|
||
if (strlen (s) >= ll)
|
||
/* User hasn't either hasn't munged it or has set it
|
||
to something shorter -- we don't have to cons */
|
||
goto copy;
|
||
else
|
||
goto cons;
|
||
};
|
||
cons:
|
||
/* User has setenv'ed it to a diferent value, and our caller
|
||
isn't guaranteeing that he won't stash it away somewhere.
|
||
We can't just return a pointer to the lisp string, as that
|
||
will be corrupted when gc happens. So, we cons (in such
|
||
a way that it can't be freed -- though this isn't such a
|
||
problem since the only callers of getenv (as opposed to
|
||
those of egetenv) are very early, before the user -could-
|
||
have frobbed the environment. */
|
||
s = (unsigned char *) xmalloc (ll + 1);
|
||
copy:
|
||
bcopy (XSTRING (tem)->data, s, ll + 1);
|
||
return (s);
|
||
}
|
||
}
|
||
}
|
||
return ((unsigned char *) 0);
|
||
}
|
||
|
||
/* unsigned -- stupid delcaration in lisp.h */ char *
|
||
getenv (str)
|
||
register unsigned char *str;
|
||
{
|
||
return ((char *) getenv_1 (str, 0));
|
||
}
|
||
|
||
unsigned char *
|
||
egetenv (str)
|
||
register unsigned char *str;
|
||
{
|
||
return (getenv_1 (str, 1));
|
||
}
|
||
|
||
|
||
#if (1 == 1) /* use caller-alloca versions, rather than callee-malloc */
|
||
int
|
||
size_of_current_environ ()
|
||
{
|
||
register int size;
|
||
Lisp_Object tem;
|
||
|
||
tem = Flength (Venvironment_alist);
|
||
|
||
size = (XINT (tem) + 1) * sizeof (unsigned char *);
|
||
/* + 1 for environment-terminating 0 */
|
||
|
||
for (tem = Venvironment_alist; !NULL (tem); tem = XCONS (tem)->cdr)
|
||
{
|
||
register Lisp_Object str, val;
|
||
|
||
str = XCONS (XCONS (tem)->car)->car;
|
||
val = XCONS (XCONS (tem)->car)->cdr;
|
||
|
||
size += (XSTRING (str)->size +
|
||
XSTRING (val)->size +
|
||
2); /* 1 for '=', 1 for '\000' */
|
||
}
|
||
return size;
|
||
}
|
||
|
||
void
|
||
get_current_environ (memory_block)
|
||
unsigned char **memory_block;
|
||
{
|
||
register unsigned char **e, *s;
|
||
register int len;
|
||
register Lisp_Object tem;
|
||
|
||
e = memory_block;
|
||
|
||
tem = Flength (Venvironment_alist);
|
||
|
||
s = (unsigned char *) memory_block
|
||
+ (XINT (tem) + 1) * sizeof (unsigned char *);
|
||
|
||
for (tem = Venvironment_alist; !NULL (tem); tem = XCONS (tem)->cdr)
|
||
{
|
||
register Lisp_Object str, val;
|
||
|
||
str = XCONS (XCONS (tem)->car)->car;
|
||
val = XCONS (XCONS (tem)->car)->cdr;
|
||
|
||
*e++ = s;
|
||
len = XSTRING (str)->size;
|
||
bcopy (XSTRING (str)->data, s, len);
|
||
s += len;
|
||
*s++ = '=';
|
||
len = XSTRING (val)->size;
|
||
bcopy (XSTRING (val)->data, s, len);
|
||
s += len;
|
||
*s++ = '\000';
|
||
}
|
||
*e = 0;
|
||
}
|
||
|
||
#else
|
||
/* dead code (this function mallocs, caller frees) superseded by above (which allows caller to use alloca) */
|
||
unsigned char **
|
||
current_environ ()
|
||
{
|
||
unsigned char **env;
|
||
register unsigned char **e, *s;
|
||
register int len, env_len;
|
||
Lisp_Object tem;
|
||
Lisp_Object str, val;
|
||
|
||
tem = Flength (Venvironment_alist);
|
||
|
||
env_len = (XINT (tem) + 1) * sizeof (char *);
|
||
/* + 1 for terminating 0 */
|
||
|
||
len = 0;
|
||
for (tem = Venvironment_alist; !NULL (tem); tem = XCONS (tem)->cdr)
|
||
{
|
||
str = XCONS (XCONS (tem)->car)->car;
|
||
val = XCONS (XCONS (tem)->car)->cdr;
|
||
|
||
len += (XSTRING (str)->size +
|
||
XSTRING (val)->size +
|
||
2);
|
||
}
|
||
|
||
e = env = (unsigned char **) xmalloc (env_len + len);
|
||
s = (unsigned char *) env + env_len;
|
||
|
||
for (tem = Venvironment_alist; !NULL (tem); tem = XCONS (tem)->cdr)
|
||
{
|
||
str = XCONS (XCONS (tem)->car)->car;
|
||
val = XCONS (XCONS (tem)->car)->cdr;
|
||
|
||
*e++ = s;
|
||
len = XSTRING (str)->size;
|
||
bcopy (XSTRING (str)->data, s, len);
|
||
s += len;
|
||
*s++ = '=';
|
||
len = XSTRING (val)->size;
|
||
bcopy (XSTRING (val)->data, s, len);
|
||
s += len;
|
||
*s++ = '\000';
|
||
}
|
||
*e = 0;
|
||
|
||
return env;
|
||
}
|
||
|
||
#endif /* dead code */
|
||
|
||
|
||
DEFUN ("getenv", Fgetenv, Sgetenv, 1, 2, "sEnvironment variable: \np",
|
||
"Return the value of environment variable VAR, as a string.\n\
|
||
When invoked interactively, print the value in the echo area.\n\
|
||
VAR is a string, the name of the variable,\n\
|
||
or the symbol t, meaning to return an alist representing the\n\
|
||
current environment.")
|
||
(str, interactivep)
|
||
Lisp_Object str, interactivep;
|
||
{
|
||
Lisp_Object val;
|
||
|
||
if (str == Qt) /* If arg is t, return whole environment */
|
||
return (Fcopy_alist (Venvironment_alist));
|
||
|
||
CHECK_STRING (str, 0);
|
||
val = Fcdr (Fassoc (str, Venvironment_alist));
|
||
if (!NULL (interactivep))
|
||
{
|
||
if (NULL (val))
|
||
message ("%s not defined in environment", XSTRING (str)->data);
|
||
else
|
||
message ("\"%s\"", XSTRING (val)->data);
|
||
}
|
||
return val;
|
||
}
|
||
|
||
DEFUN ("setenv", Fsetenv, Ssetenv, 1, 2,
|
||
"sEnvironment variable: \nsSet %s to value: ",
|
||
"Set the value of environment variable VAR to VALUE.\n\
|
||
Both args must be strings. Returns VALUE.")
|
||
(str, val)
|
||
Lisp_Object str;
|
||
Lisp_Object val;
|
||
{
|
||
Lisp_Object tem;
|
||
|
||
CHECK_STRING (str, 0);
|
||
if (!NULL (val))
|
||
CHECK_STRING (val, 0);
|
||
|
||
set_environment_alist (str, val);
|
||
return val;
|
||
}
|
||
|
||
|
||
syms_of_environ ()
|
||
{
|
||
staticpro (&Venvironment_alist);
|
||
defsubr (&Ssetenv);
|
||
defsubr (&Sgetenv);
|
||
}
|
||
|
||
init_environ ()
|
||
{
|
||
Venvironment_alist = Qnil;
|
||
initialize_environment_alist ();
|
||
}
|
||
|
||
#endif /* MAINTAIN_ENVIRONMENT */
|