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74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/*
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* have_arc4random - Determine if we have the arc4random_buf() RNG
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*
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* Copyright (C) 2021 Landon Curt Noll
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*
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* Calc is open software; you can redistribute it and/or modify it under
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* the terms of the version 2.1 of the GNU Lesser General Public License
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* as published by the Free Software Foundation.
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*
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* Calc is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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* Public License for more details.
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*
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* A copy of version 2.1 of the GNU Lesser General Public License is
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* distributed with calc under the filename COPYING-LGPL. You should have
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* received a copy with calc; if not, write to Free Software Foundation, Inc.
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Under source code control: 2021/12/06 23:58:51
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* File existed as early as: 2021
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*
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* chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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* Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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*/
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/*
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* usage:
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* have_arc4random
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*
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* Not all enviroments have the arc4random_buf() function,
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* so this may not compile on your system.
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*
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* This prog outputs:
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*
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* HAVE_ARC4RANDOM
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* defined ==> have arc4random_buf() call
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* undefined ==> do not have arc4random_buf() call
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*/
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#include "have_stdlib.h"
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#if defined(HAVE_STDLIB_H)
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#include <stdlib.h>
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#endif
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#include <stdio.h>
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#include "banned.h" /* include after system header <> includes */
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#define BUFLEN (32) /* length of the buffer to fill */
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int
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main(void)
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{
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#if defined(HAVE_NO_ARC4RANDOM)
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printf("#undef HAVE_ARC4RANDOM /* no */\n");
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#else /* HAVE_NO_ARC4RANDOM */
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/* buffer for arc4random_buf() to fill */
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static char buf[BUFLEN];
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arc4random_buf(buf, BUFLEN);
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printf("#define HAVE_ARC4RANDOM /* yes */\n");
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#endif /* HAVE_NO_ARC4RANDOM */
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/* exit(0); */
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return 0;
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}
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