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;;; setenv.el --- functions to manipulate environment variables.
;; Maintainer: FSF
;; Last-Modified: 16 Mar 1992
;;; Copyright Free Software Foundation 1991
;;; 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 2, 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.
;;; Code:
(defun setenv (variable value)
"Set the value of the environment variable named VARIABLE to VALUE.
VARIABLE and VALUE should both be strings.
This function works by modifying process-environment."
(if (string-match "=" variable)
(error "name of environment variable contains an '=' character")
(let ((pattern (concat "^" (regexp-quote (concat variable "="))))
(scan process-environment))
(while scan
(cond
((string-match pattern (car scan))
(setcar scan (concat variable "=" value))
(setq scan nil))
((null (setq scan (cdr scan)))
(setq process-environment
(cons (concat variable "=" value) process-environment))))))))
(provide 'setenv)
;;; setenv.el ends here
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