Date: Mon, 9 Dec 2002 12:23:38 -0800 (PST) From: Nate Lawson <nate@root.org> To: phk@FreeBSD.ORG Cc: "M. Warner Losh" <imp@bsdimp.com>, arch@FreeBSD.ORG Subject: Re: le??toh, etc in userland Message-ID: <Pine.BSF.4.21.0212091220220.25027-100000@root.org> In-Reply-To: <74122.1039458137@critter.freebsd.dk>
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On Mon, 9 Dec 2002 phk@FreeBSD.ORG wrote:
> In message <20021209.095032.102181079.imp@bsdimp.com>, "M. Warner Losh" writes:
>
> >We should provide an implementation of {b,l}e{16,32}toh and
> >hto{b,l}e{16,32} in libc. Any objections?
>
> None as such.
>
> I would really like to also have the "byte-encoding" version in a
> more general place than in GEOM, but I am not aware of any suitable
> standards in this area.
>
> The reason of these is that the data encoded/decoded may not live
> on native alignment boundaries, so the normal "swap-as-needed"
> functions are not very efficient.
Already present in CAM (sys/cam/ssi_all.h):
static __inline void scsi_ulto2b(u_int32_t val, u_int8_t *bytes);
static __inline void scsi_ulto3b(u_int32_t val, u_int8_t *bytes);
static __inline void scsi_ulto4b(u_int32_t val, u_int8_t *bytes);
static __inline u_int32_t scsi_2btoul(u_int8_t *bytes);
static __inline u_int32_t scsi_3btoul(u_int8_t *bytes);
static __inline int32_t scsi_3btol(u_int8_t *bytes);
static __inline u_int32_t scsi_4btoul(u_int8_t *bytes);
I would love to have a 64 bit version and map these to a generic host
version. It should use u_int8_t instead of u_char though.
-Nate
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