diff options
Diffstat (limited to 'libpam/include')
| -rw-r--r-- | libpam/include/pam_cc_compat.h | 13 | ||||
| -rw-r--r-- | libpam/include/pam_inline.h | 37 |
2 files changed, 50 insertions, 0 deletions
diff --git a/libpam/include/pam_cc_compat.h b/libpam/include/pam_cc_compat.h index c43989f7..69190368 100644 --- a/libpam/include/pam_cc_compat.h +++ b/libpam/include/pam_cc_compat.h @@ -50,4 +50,17 @@ # define DIAG_POP_IGNORE_CAST_ALIGN /* empty */ #endif +/* + * Evaluates to + * 1, if the given two types are known to be the same + * 0, otherwise. + */ +#if PAM_GNUC_PREREQ(3, 0) +# define PAM_IS_SAME_TYPE(x_, y_) \ + __builtin_types_compatible_p(__typeof__(x_), __typeof__(y_)) +#else +/* Cannot tell whether these types are the same. */ +# define PAM_IS_SAME_TYPE(x_, y_) 0 +#endif + #endif /* PAM_CC_COMPAT_H */ diff --git a/libpam/include/pam_inline.h b/libpam/include/pam_inline.h new file mode 100644 index 00000000..d93f8474 --- /dev/null +++ b/libpam/include/pam_inline.h @@ -0,0 +1,37 @@ +/* + * 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 */ |