| /* The array_length and array_end macros. |
| Copyright (C) 2017-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _ARRAY_LENGTH_H |
| #define _ARRAY_LENGTH_H |
| |
| /* array_length (VAR) is the number of elements in the array VAR. VAR |
| must evaluate to an array, not a pointer. */ |
| #define array_length(var) \ |
| __extension__ ({ \ |
| _Static_assert (!__builtin_types_compatible_p \ |
| (__typeof (var), __typeof (&(var)[0])), \ |
| "argument must be an array"); \ |
| sizeof (var) / sizeof ((var)[0]); \ |
| }) |
| |
| /* array_end (VAR) is a pointer one past the end of the array VAR. |
| VAR must evaluate to an array, not a pointer. */ |
| #define array_end(var) (&(var)[array_length (var)]) |
| |
| #endif /* _ARRAY_LENGTH_H */ |
