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new adf172ab793 include/sys/param.h: Add setbit, clrbit, isset, and isclr.
adf172ab793 is described below
commit adf172ab7937cc6456ec5fea3832e820e409ebbf
Author: Swatantra Yadav <[email protected]>
AuthorDate: Thu Oct 29 17:17:00 2026 +0530
include/sys/param.h: Add setbit, clrbit, isset, and isclr.
The BSDs (FreeBSD, OpenBSD, NetBSD), glibc, and musl define standard
bit-string manipulation macros in <sys/param.h>: setbit, clrbit,
isset, and isclr. These macros operate on byte arrays using NBBY.
This patch implements these standard convenience macros in
<sys/param.h> to improve BSD/POSIX compatibility.
Assisted-by: Google Gemini
Signed-off-by: Swatantra Yadav <[email protected]>
---
include/sys/param.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/include/sys/param.h b/include/sys/param.h
index b3fe4f0050e..9f621000d26 100644
--- a/include/sys/param.h
+++ b/include/sys/param.h
@@ -106,6 +106,24 @@
# define powerof2(a) (!(((a) - 1) & (a)))
#endif /* powerof2 */
+/* Macros for bit-strings. */
+
+#ifndef setbit
+# define setbit(a, i) ((a)[(i) / NBBY] |= (1 << ((i) % NBBY)))
+#endif /* setbit */
+
+#ifndef clrbit
+# define clrbit(a, i) ((a)[(i) / NBBY] &= ~(1 << ((i) % NBBY)))
+#endif /* clrbit */
+
+#ifndef isset
+# define isset(a, i) ((a)[(i) / NBBY] & (1 << ((i) % NBBY)))
+#endif /* isset */
+
+#ifndef isclr
+# define isclr(a, i) (((a)[(i) / NBBY] & (1 << ((i) % NBBY))) == 0)
+#endif /* isclr */
+
/****************************************************************************
* Public Type Definitions
****************************************************************************/
