r2912: rename .cl to .lisp

[uffi.git] / examples / getenv.lisp

diff --git a/examples/getenv.lisp b/examples/getenv.lisp
new file mode 100644 (file)
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--- /dev/null
+++ b/examples/getenv.lisp
@@ -0,0 +1,47 @@
+;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name:          getenv.cl
+;;;; Purpose:       UFFI Example file to get environment variable
+;;;; Programmer:    Kevin M. Rosenberg
+;;;; Date Started:  Feb 2002
+;;;;
+;;;; $Id: getenv.lisp,v 1.1 2002/09/30 10:02:36 kevin Exp $
+;;;;
+;;;; This file, part of UFFI, is Copyright (c) 2002 by Kevin M. Rosenberg
+;;;;
+;;;; UFFI users are granted the rights to distribute and use this software
+;;;; as governed by the terms of the Lisp Lesser GNU Public License
+;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
+;;;; *************************************************************************
+
+(in-package :cl-user)
+
+
+(uffi:def-function ("getenv" c-getenv) 
+    ((name :cstring))
+  :returning :cstring)
+
+(defun my-getenv (key)
+  "Returns an environment variable, or NIL if it does not exist"
+  (check-type key string)
+  (uffi:with-cstring (key-native key)
+    (uffi:convert-from-cstring (c-getenv key-native))))
+    
+#+examples-uffi
+(progn
+  (flet ((print-results (str)
+          (format t "~&(getenv ~S) => ~S" str (my-getenv str))))
+    (print-results "USER")
+    (print-results "_FOO_")))
+
+
+#+test-uffi
+(progn
+  (util.test:test (my-getenv "_FOO_") nil :fail-info "Error retrieving non-existent getenv")
+  (util.test:test (and (stringp (my-getenv "USER"))
+                      (< 0 (length (my-getenv "USER"))))
+                 t :fail-info "Error retrieving getenv")
+)
+