From 92d5c03ef86fbd21a84d9425c456f01e6c513817 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Tue, 30 Jul 2024 13:12:52 +0000
Subject:  Fix small bugs, add autodelegation for IOPAUSE_EXCEPT

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/libstddjb/ip4_netmask.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 src/libstddjb/ip4_netmask.c

(limited to 'src/libstddjb/ip4_netmask.c')

diff --git a/src/libstddjb/ip4_netmask.c b/src/libstddjb/ip4_netmask.c
new file mode 100644
index 0000000..19f485f
--- /dev/null
+++ b/src/libstddjb/ip4_netmask.c
@@ -0,0 +1,14 @@
+/* ISC license. */
+
+#include <skalibs/uint32.h>
+#include <skalibs/fmtscan.h>
+
+int ip4_netmask (char *ip, uint8_t netmask)
+{
+  uint32_t u ;
+  if (netmask > 32) return 0 ;
+  uint32_unpack_big(ip, &u) ;
+  u &= netmask ? ~((1u << 32 - netmask) - 1) : 0 ;
+  uint32_pack_big(ip, u) ;
+  return 1 ;
+}
-- 
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