Use ffs64(3) instead of ffs(3) when calculating to see if we can fit the

user number inside the resultant length given the prefix length, so we can
use the whole of the user number (64 bits) if needed.

Add a compat ffs64(3) implementation from NetBSD if none found on the platform.

1 files changed, 22 insertions, 0 deletions

diff --git a/configure b/configure
index f0eabf92..0ad1f77b 100755
--- a/configure
+++ b/configure
@@ -985,6 +985,28 @@ if [ "$BE64ENC" = no ]; then
 	echo "#include		\"compat/endian.h\"" >>$CONFIG_H
 fi
 
+if [ -z "$FFS64" ]; then
+	printf "Testing for ffs64 ... "
+	cat <<EOF >_ffs64.c
+#include <sys/bitops.h>
+int main(void) {
+	return (int)ffs64(1337);
+}
+EOF
+	if $XCC _ffs64.c -o _ffs64 2>&3; then
+		FFS64=yes
+	else
+		FFS64=no
+	fi
+	echo "$FFS64"
+	rm -f _ffs64.c _ffs64
+fi
+if [ "$FFS64" = yes ]; then
+	echo "CPPFLAGS+=	-DHAVE_SYS_BITOPS_H" >>$CONFIG_MK
+else
+	echo "#include		\"compat/ffs64.h\"" >>$CONFIG_H
+fi
+
 if [ -z "$MD5" ]; then
 	MD5_LIB=
 	printf "Testing for MD5Init ... "