mirror of
https://github.com/lcn2/calc.git
synced 2025-08-16 01:03:29 +03:00
db77e29a23
Converted all ASCII tabs to ASCII spaces using a 8 character tab stop, for all files, except for all Makefiles (plus rpm.mk). The `git diff -w` reports no changes.
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*
|
|
* have_environ - Determine if we have the environ user environment synbol
|
|
*
|
|
* 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 non-NULL extern symbol
|
|
* undefined ==> environ is NOT an extern symbol or is NULL
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
|
|
|
|
#include "banned.h" /* include after system header <> includes */
|
|
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
#if defined(HAVE_NO_ENVIRON)
|
|
|
|
printf("#undef HAVE_ENVIRON /* no */\n");
|
|
|
|
#else /* HAVE_NO_ENVIRON */
|
|
|
|
extern char **environ;
|
|
|
|
if (environ == NULL) {
|
|
printf("#define HAVE_ENVIRON /* no */\n");
|
|
} else {
|
|
printf("#define HAVE_ENVIRON /* yes */\n");
|
|
}
|
|
|
|
#endif /* HAVE_NO_ENVIRON */
|
|
|
|
/* exit(0); */
|
|
return 0;
|
|
}
|