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Date: Wed, 31 May 2023 12:05:16 +0200
From: Jens Gustedt <Jens.Gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: [C23 new stdlib 2/3] C23: add the memalignment function
The name is reserved, so we don't need to protect it via a feature
macro or a weak symbol.
---
include/stdlib.h | 2 ++
src/stdlib/memalignment.c | 8 ++++++++
2 files changed, 10 insertions(+)
create mode 100644 src/stdlib/memalignment.c
diff --git a/include/stdlib.h b/include/stdlib.h
index 2f46e6aa..10bdf7f8 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -180,6 +180,8 @@ typedef int once_flag;
void call_once(once_flag *, void (*)(void));
#endif
+size_t memalignment(const void *);
+
#ifdef __cplusplus
}
#endif
diff --git a/src/stdlib/memalignment.c b/src/stdlib/memalignment.c
new file mode 100644
index 00000000..0f87c71b
--- /dev/null
+++ b/src/stdlib/memalignment.c
@@ -0,0 +1,8 @@
+#include <stdlib.h>
+#include <stdint.h>
+
+size_t memalignment(const void *p)
+{
+ uintptr_t bits = (uintptr_t)p;
+ return (bits^(bits-1))&bits;
+}
--
2.34.1
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