diff options
author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-12-27 15:36:51 +0000 |
---|---|---|
committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-12-27 15:36:51 +0000 |
commit | 05fa8834c6644f12405ea713c48693bf2d1864f1 (patch) | |
tree | c6b6391884370c75972a2e432d42ebbb076a0cdf /include/array_length.h | |
parent | 525c181a5a9a95e24d2111b7792608151a40eb84 (diff) | |
parent | 963c37d5c0eb62b38f8764b23931c0dcdd497a13 (diff) |
Merge commit 'refs/top-bases/t/bigmem' into t/bigmemt/bigmem
Diffstat (limited to 'include/array_length.h')
-rw-r--r-- | include/array_length.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/include/array_length.h b/include/array_length.h new file mode 100644 index 0000000000..94bf2b2d4d --- /dev/null +++ b/include/array_length.h @@ -0,0 +1,36 @@ +/* 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 */ |