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From: Jens Gustedt <Jens.Gustedt@inria.fr>
To: musl@lists.openwall.com
Subject: [musl] [C23 new stdlib 2/3] C23: add the memalignment function
Date: Wed, 31 May 2023 12:05:16 +0200	[thread overview]
Message-ID: <0620da4a3eaadc604c8e7696d81f5c44dfcac6fb.1685527375.git.Jens.Gustedt@inria.fr> (raw)
In-Reply-To: <cover.1685527375.git.Jens.Gustedt@inria.fr>

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


  parent reply	other threads:[~2023-05-31 10:06 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-31 10:05 [musl] [C23 new stdlib 0/3] Jens Gustedt
2023-05-31 10:05 ` [musl] [C23 new stdlib 1/3] C23: add the new interfaces free_sized and free_aligned_sized for stdlib.h Jens Gustedt
2023-05-31 10:05 ` Jens Gustedt [this message]
2023-05-31 10:05 ` [musl] [C23 new stdlib 3/3] C23: implement the new strfrom[dfl] functions Jens Gustedt

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