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Sand edges down on GBIT64()/PBIT64() macros.

Now, you can safely use them in unbraced if statements, and
with char*s.

--- a/sys/include/fcall.h

+++ b/sys/include/fcall.h

@@ -61,17 +61,20 @@

 } Fcall;

-#define	GBIT8(p)	((p)[0])

-#define	GBIT16(p)	((p)[0]|((p)[1]<<8))

-#define	GBIT32(p)	((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24))

-#define	GBIT64(p)	((u32int)((p)[0]|((p)[1]<<8)|((p)[2]<<16)|((p)[3]<<24)) |\

-				((vlong)((p)[4]|((p)[5]<<8)|((p)[6]<<16)|((p)[7]<<24)) << 32))

+#define	GBIT8(p)	(((uchar*)(p))[0])

+#define	GBIT16(p)	(((uchar*)(p))[0]|(((uchar*)(p))[1]<<8))

+#define	GBIT32(p)	(((uchar*)(p))[0]|(((uchar*)(p))[1]<<8)|\

+				(((uchar*)(p))[2]<<16)|(((uchar*)(p))[3]<<24))

+#define	GBIT64(p)	((u32int)(((uchar*)(p))[0]|(((uchar*)(p))[1]<<8)|\

+				(((uchar*)(p))[2]<<16)|(((uchar*)(p))[3]<<24)) |\

+			((uvlong)(((uchar*)(p))[4]|(((uchar*)(p))[5]<<8)|\

+				(((uchar*)(p))[6]<<16)|(((uchar*)(p))[7]<<24)) << 32))

-#define	PBIT8(p,v)	(p)[0]=(v)

-#define	PBIT16(p,v)	(p)[0]=(v);(p)[1]=(v)>>8

-#define	PBIT32(p,v)	(p)[0]=(v);(p)[1]=(v)>>8;(p)[2]=(v)>>16;(p)[3]=(v)>>24

-#define	PBIT64(p,v)	(p)[0]=(v);(p)[1]=(v)>>8;(p)[2]=(v)>>16;(p)[3]=(v)>>24;\

-			(p)[4]=(v)>>32;(p)[5]=(v)>>40;(p)[6]=(v)>>48;(p)[7]=(v)>>56

+#define	PBIT8(p,v)	do{(p)[0]=(v);}while(0)

+#define	PBIT16(p,v)	do{(p)[0]=(v);(p)[1]=(v)>>8;}while(0)

+#define	PBIT32(p,v)	do{(p)[0]=(v);(p)[1]=(v)>>8;(p)[2]=(v)>>16;(p)[3]=(v)>>24;}while(0)

+#define	PBIT64(p,v)	do{(p)[0]=(v);(p)[1]=(v)>>8;(p)[2]=(v)>>16;(p)[3]=(v)>>24;\

+			   (p)[4]=(v)>>32;(p)[5]=(v)>>40;(p)[6]=(v)>>48;(p)[7]=(v)>>56;}while(0)

 #define	BIT8SZ		1

 #define	BIT16SZ		2

-- 

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