From 1a90eae68dbf762b921f921f4d73c1cae69e840f Mon Sep 17 00:00:00 2001
From: Dave Love <fx@gnu.org>
Date: Mon, 24 Feb 2003 22:51:41 +0000
Subject: [PATCH] (read-envvar-name): Decode names. (substitute-env-vars): Use
 eval-when-compile and char class. (setenv): Doc fix.  Encode the data (after
 checking that's possible). (getenv): Encode the name and decode the result.

---
 lisp/env.el | 55 +++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 43 insertions(+), 12 deletions(-)

diff --git a/lisp/env.el b/lisp/env.el
index f41677fcf18..912634482bf 100644
--- a/lisp/env.el
+++ b/lisp/env.el
@@ -1,6 +1,6 @@
 ;;; env.el --- functions to manipulate environment variables
 
-;; Copyright (C) 1991, 1994, 2000, 2001 Free Software Foundation, Inc.
+;; Copyright (C) 1991, 1994, 2000, 2001, 2003 Free Software Foundation, Inc.
 
 ;; Maintainer: FSF
 ;; Keywords: processes, unix
@@ -29,6 +29,10 @@
 ;; program options.  This package permits you to set environment variables
 ;; to be passed to any sub-process run under Emacs.
 
+;; Note that the environment string `process-environment' is not
+;; decoded, but the args of `setenv' and `getenv' are normally
+;; multibyte text and get coding conversion.
+
 ;;; Code:
 
 ;; History list for environment variable names.
@@ -39,10 +43,14 @@
 Optional second arg MUSTMATCH, if non-nil, means require existing envvar name.
 If it is also not t, RET does not exit if it does non-null completion."
   (completing-read prompt
-		   (mapcar (function
-			    (lambda (enventry)
-			      (list (substring enventry 0
-					       (string-match "=" enventry)))))
+		   (mapcar (lambda (enventry)
+			     (list (if enable-multibyte-characters
+				       (decode-coding-string
+					(substring enventry 0
+						   (string-match "=" enventry))
+					locale-coding-system t)
+				     (substring enventry 0
+						(string-match "=" enventry)))))
 			   process-environment)
 		   nil mustmatch nil 'read-envvar-name-history))
 
@@ -59,9 +67,10 @@ the entire variable name in braces.  Use `$$' to insert a single
 dollar sign."
   (let ((start 0))
     (while (string-match
-	    (rx (or (and "$" (submatch (1+ (in "a-zA-Z0-9_"))))
-		    (and "${" (submatch (minimal-match (0+ anything))) "}")
-		    "$$"))
+	    (eval-when-compile
+	      (rx (or (and "$" (submatch (1+ (regexp "[:alnum:]_"))))
+		      (and "${" (submatch (minimal-match (0+ anything))) "}")
+		      "$$")))
 	    string start)
       (cond ((match-beginning 1)
 	     (let ((value (getenv (match-string 1 string))))
@@ -76,6 +85,7 @@ dollar sign."
 		   start (+ (match-beginning 0) 1)))))
     string))
 
+;; Fixme: Should `process-environment' be recoded if LC_CTYPE &c is set?
 
 (defun setenv (variable &optional value unset substitute-env-vars)
   "Set the value of the environment variable named VARIABLE to VALUE.
@@ -92,7 +102,10 @@ Interactively, the current value (if any) of the variable
 appears at the front of the history list when you type in the new value.
 Interactively, always replace environment variables in the new value.
 
-This function works by modifying `process-environment'."
+This function works by modifying `process-environment'.
+
+As a special case, setting variable `TZ' calls `set-time-zone-rule' as
+a side-effect."
   (interactive
    (if current-prefix-arg
        (list (read-envvar-name "Clear environment variable: " 'exact) nil t)
@@ -107,10 +120,22 @@ This function works by modifying `process-environment'."
 				   value)
 	     nil
 	     t))))
-  (if unset
+  (if (and (multibyte-string-p variable) locale-coding-system)
+      (unless (memq (coding-system-base locale-coding-system)
+		    (find-coding-systems-string (concat variable value)))
+	(error "Can't encode `%s=%s' with `locale-coding-system'"
+	       variable (or value "")))
+    (unless (memq 'undecided (find-coding-systems-string variable))
+      (error "Can't encode `%s=%s' with unspecified `locale-coding-system'"
+	     variable (or value ""))))
+  (if unset 
       (setq value nil)
     (if substitute-env-vars
 	(setq value (substitute-env-vars value))))
+  (if (multibyte-string-p variable)
+      (setq variable (encode-coding-string variable locale-coding-system)))
+  (if (and value (multibyte-string-p value))
+      (setq value (encode-coding-string value locale-coding-system)))
   (if (string-match "=" variable)
       (error "Environment variable name `%s' contains `='" variable)
     (let ((pattern (concat "\\`" (regexp-quote (concat variable "="))))
@@ -123,7 +148,8 @@ This function works by modifying `process-environment'."
 	(cond ((string-match pattern (car scan))
 	       (setq found t)
 	       (if (eq nil value)
-		   (setq process-environment (delq (car scan) process-environment))
+		   (setq process-environment (delq (car scan)
+						   process-environment))
 		 (setcar scan (concat variable "=" value)))
 	       (setq scan nil)))
 	(setq scan (cdr scan)))
@@ -142,7 +168,12 @@ the environment.  Otherwise, value is a string.
 This function consults the variable `process-environment'
 for its value."
   (interactive (list (read-envvar-name "Get environment variable: " t)))
-  (let ((value (getenv-internal variable)))
+  (let ((value (getenv-internal (if (multibyte-string-p variable)
+				    (encode-coding-string
+				     variable locale-coding-system)
+				  variable))))
+    (if (and enable-multibyte-characters value)
+	(setq value (decode-coding-string value locale-coding-system)))
     (when (interactive-p)
       (message "%s" (if value value "Not set")))
     value))
-- 
2.39.2