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author | Paul Eggert <eggert@cs.ucla.edu> | 2022-08-17 18:50:06 -0700 |
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committer | Paul Eggert <eggert@cs.ucla.edu> | 2022-08-17 18:51:34 -0700 |
commit | b6b191108000104519f9f6cee70b0ef9bba9dbc6 (patch) | |
tree | 5d154bb417b4bc0351ddb65a3f223d4f881b3e1f /lib/stdckdint.in.h | |
parent | 3e042c80ce708b2d27da8ff62f19a5706f6d7fc6 (diff) | |
download | emacs-b6b191108000104519f9f6cee70b0ef9bba9dbc6.tar.gz |
Update from Gnulib by running admin/merge-gnulib
Diffstat (limited to 'lib/stdckdint.in.h')
-rw-r--r-- | lib/stdckdint.in.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/lib/stdckdint.in.h b/lib/stdckdint.in.h new file mode 100644 index 00000000000..90fa62e5966 --- /dev/null +++ b/lib/stdckdint.in.h @@ -0,0 +1,37 @@ +/* stdckdint.h -- checked integer arithmetic + + Copyright 2022 Free Software Foundation, Inc. + + This program 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. + + This program 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 this program. If not, see <https://www.gnu.org/licenses/>. */ + +#ifndef _GL_STDCKDINT_H +#define _GL_STDCKDINT_H + +#include "intprops-internal.h" + +#include <stdbool.h> + +/* Store into *R the low-order bits of A + B, A - B, A * B, respectively. + Return 1 if the result overflows, 0 otherwise. + A, B, and *R can have any integer type other than char, bool, a + bit-precise integer type, or an enumeration type. + + These are like the standard macros introduced in C23, except that + arguments should not have side effects. */ + +#define ckd_add(r, a, b) ((bool) _GL_INT_ADD_WRAPV (a, b, r)) +#define ckd_sub(r, a, b) ((bool) _GL_INT_SUBTRACT_WRAPV (a, b, r)) +#define ckd_mul(r, a, b) ((bool) _GL_INT_MULTIPLY_WRAPV (a, b, r)) + +#endif /* _GL_STDCKDINT_H */ |