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| author | Dag-Erling Smørgrav <des@FreeBSD.org> | 2023-09-07 06:14:54 +0000 |
|---|---|---|
| committer | Dag-Erling Smørgrav <des@FreeBSD.org> | 2023-09-07 06:40:14 +0000 |
| commit | e6615b10347caf67f5bc12c9a8e30b8ddd9860ae (patch) | |
| tree | d426c1c434062d934c8b511fd0e146589ddf0b22 /include | |
| parent | 12b1c1e3fb446021a881d9815465137843fca50b (diff) | |
| download | src-e6615b10347caf67f5bc12c9a8e30b8ddd9860ae.tar.gz src-e6615b10347caf67f5bc12c9a8e30b8ddd9860ae.zip | |
include: Implement N2867.
This adds macros for checked addition, subtraction, and multiplication with semantics similar to the builtins gcc and clang have had for years.
Reviewed by: kib, emaste
Differential Revision: https://reviews.freebsd.org/D41734
Diffstat (limited to 'include')
| -rw-r--r-- | include/Makefile | 2 | ||||
| -rw-r--r-- | include/stdckdint.h | 40 |
2 files changed, 41 insertions, 1 deletions
diff --git a/include/Makefile b/include/Makefile index 1d7651216cf9..bc1cfd96dfc9 100644 --- a/include/Makefile +++ b/include/Makefile @@ -30,7 +30,7 @@ INCS= a.out.h ar.h assert.h bitstring.h byteswap.h \ pthread_np.h pwd.h ranlib.h readpassphrase.h regex.h \ res_update.h resolv.h runetype.h sched.h \ search.h semaphore.h setjmp.h \ - signal.h spawn.h stab.h stdalign.h stdbool.h stddef.h \ + signal.h spawn.h stab.h stdalign.h stdbool.h stdckdint.h stddef.h \ stdnoreturn.h stdio.h stdlib.h string.h stringlist.h \ strings.h sysexits.h tar.h termios.h tgmath.h \ time.h timeconv.h timers.h ttyent.h \ diff --git a/include/stdckdint.h b/include/stdckdint.h new file mode 100644 index 000000000000..af3074dded89 --- /dev/null +++ b/include/stdckdint.h @@ -0,0 +1,40 @@ +/*- + * Copyright (c) 2023 Dag-Erling Smørgrav + * + * SPDX-License-Identifier: BSD-2-Clause + */ + +#ifndef __STDC_VERSION_STDCKDINT_H__ +#define __STDC_VERSION_STDCKDINT_H__ 202311L + +#include <sys/cdefs.h> + +#if __BSD_VISIBLE || __ISO_C_VISIBLE >= 2023 + +#if __GNUC_PREREQ__(5, 1) || __has_builtin(__builtin_add_overflow) +#define ckd_add(result, a, b) \ + (_Bool)__builtin_add_overflow((a), (b), (result)) +#else +#define ckd_add(result, a, b) \ + _Static_assert(0, "checked addition not supported") +#endif + +#if __GNUC_PREREQ__(5, 1) || __has_builtin(__builtin_sub_overflow) +#define ckd_sub(result, a, b) \ + (_Bool)__builtin_sub_overflow((a), (b), (result)) +#else +#define ckd_sub(result, a, b) \ + _Static_assert(0, "checked subtraction not supported") +#endif + +#if __GNUC_PREREQ__(5, 1) || __has_builtin(__builtin_mul_overflow) +#define ckd_mul(result, a, b) \ + (_Bool)__builtin_mul_overflow((a), (b), (result)) +#else +#define ckd_mul(result, a, b) \ + _Static_assert(0, "checked multiplication not supported") +#endif + +#endif + +#endif |