add libc testcase.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1061 bbd45198-f89e-11dd-88c7-29a3b14d5316

examples/libc/env.c

@@ -0,0 +1,18 @@
+/*
+ * env.c
+ *
+ *  Created on: 2010-11-17
+ *      Author: bernard
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <finsh.h>
+
+int libc_env()
+{
+	printf("PATH=%s\n", getenv("PATH"));
+	putenv("foo=bar");
+	printf("foo=%s\n", getenv("foo"));
+	return 0;
+}
+FINSH_FUNCTION_EXPORT(libc_env, get/set_env test);