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Date: Fri, 26 May 2023 11:40:01 +0200
From: Jens Gustedt <Jens.Gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: [C23 stdckdint.h 1/1] C23: add the stdckdint.h header for checked integer operations
These macros have a direct correspondence with gcc builtins, so the
implementation for musl is trivial. Note that this only intefaces the
type-generic features, so no function symbol is added to the
library. Since also this is a new header that only exposes its
contents when it is explicitly included, no feature test macros are
needed.
---
include/stdckdint.h | 8 ++++++++
1 file changed, 8 insertions(+)
create mode 100644 include/stdckdint.h
diff --git a/include/stdckdint.h b/include/stdckdint.h
new file mode 100644
index 00000000..893126dc
--- /dev/null
+++ b/include/stdckdint.h
@@ -0,0 +1,8 @@
+#ifndef __STDC_VERSION_STDCKDINT_H__
+#define __STDC_VERSION_STDCKDINT_H__ 202311L
+
+#define ckd_add(R, A, B) __builtin_add_overflow ((A), (B), (R))
+#define ckd_sub(R, A, B) __builtin_sub_overflow ((A), (B), (R))
+#define ckd_mul(R, A, B) __builtin_mul_overflow ((A), (B), (R))
+
+#endif
--
2.34.1
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