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/*
* Copyright (c) 2020 Dmitry V. Levin <ldv@altlinux.org>
*
* Handy inline functions and macros providing some convenient functionality
* to libpam and its modules.
*/
#ifndef PAM_INLINE_H
#define PAM_INLINE_H
#include "pam_cc_compat.h"
/*
* Evaluates to
* - a syntax error if the argument is 0,
* 0, otherwise.
*/
#define PAM_FAIL_BUILD_ON_ZERO(e_) (sizeof(int[-1 + 2 * !!(e_)]) * 0)
/*
* Evaluates to
* 1, if the given type is known to be a non-array type
* 0, otherwise.
*/
#define PAM_IS_NOT_ARRAY(a_) PAM_IS_SAME_TYPE((a_), &(a_)[0])
/*
* Evaluates to
* - a syntax error if the argument is not an array,
* 0, otherwise.
*/
#define PAM_MUST_BE_ARRAY(a_) PAM_FAIL_BUILD_ON_ZERO(!PAM_IS_NOT_ARRAY(a_))
/* Evaluates to the number of elements in the specified array. */
#define PAM_ARRAY_SIZE(a_) (sizeof(a_) / sizeof((a_)[0]) + PAM_MUST_BE_ARRAY(a_))
#endif /* PAM_INLINE_H */
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