From 7417f2e776e7dfc911a3510fa64aab9000b7e876 Mon Sep 17 00:00:00 2001
From: Landon Curt Noll <github-mail@asthe.com>
Date: Mon, 6 Dec 2021 21:13:53 -0800
Subject: [PATCH] Remove excess blank line from calc.c

---
 calc.c         |  1 -
 have_environ.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 70 insertions(+), 1 deletion(-)
 create mode 100644 have_environ.c

diff --git a/calc.c b/calc.c
index 268ab30..71115f8 100644
--- a/calc.c
+++ b/calc.c
@@ -548,7 +548,6 @@ main(int argc, char **argv)
 		setbuf(stdout, NULL);
 	}
 
-
 	/*
 	 * initialize
 	 */
diff --git a/have_environ.c b/have_environ.c
new file mode 100644
index 0000000..3efbe31
--- /dev/null
+++ b/have_environ.c
@@ -0,0 +1,70 @@
+/*
+ * have_environ - Determine if we have the environ user environment value
+ *
+ * Copyright (C) 2021  Landon Curt Noll
+ *
+ * Calc is open software; you can redistribute it and/or modify it under
+ * the terms of the version 2.1 of the GNU Lesser General Public License
+ * as published by the Free Software Foundation.
+ *
+ * Calc 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 Lesser General
+ * Public License for more details.
+ *
+ * A copy of version 2.1 of the GNU Lesser General Public License is
+ * distributed with calc under the filename COPYING-LGPL.  You should have
+ * received a copy with calc; if not, write to Free Software Foundation, Inc.
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Under source code control:	2021/12/06 19:34:32
+ * File existed as early as:	2021
+ *
+ * chongo <was here> /\oo/\	http://www.isthe.com/chongo/
+ * Share and enjoy!  :-)	http://www.isthe.com/chongo/tech/comp/calc/
+ */
+
+/*
+ * usage:
+ *	have_environ
+ *
+ * Not all enviroments have the user environment external:
+ *
+ *	extern char **environ;
+ *
+ * so this may not compile on your system.
+ *
+ * This prog outputs:
+ *
+ *	HAVE_ENVIRON
+ *		defined ==> environ is an extern symbol
+ *		undefined ==> environ is NOT an extern symbol
+ */
+
+#include <stdio.h>
+
+
+#include "banned.h"	/* include after system header <> includes */
+
+
+extern char **environ;	/* user environment */
+
+
+int
+main(void)
+{
+#if defined(HAVE_NO_ENVIRON)
+
+	printf("#undef HAVE_ENVIRON /* no */\n");
+
+#else /* HAVE_NO_CONST */
+
+	const char * const str = "const";
+
+	printf("#define HAVE_ENVIRON /* yes */\n");
+
+#endif /* HAVE_NO_CONST */
+
+	/* exit(0); */
+	return 0;
+}