> I'm getting rid of ape but I need the functions at
> /sys/src/ape/lib/bsd/ntohl.c to port some software. These functions
> just change endianness. Is there some native similar functions
> somebody is aware of? lookman is not helping me here. I don't want
> to add code if a similar functionality is already in the system.
No. Those functions are mental. The Plan 9 way is so simple that
there's no library, everyone just brings their own macros/functions.
The trick is: if you care about the order of bytes then you should be
dealing with a byte array, not a native integral type.
These are from Ori's git implementation though there are other,
similar implementations around the place (e.g. lib9p, venti). They
do the job perfectly well.
#define GETBE32(b) \
((((b)[0] & 0xFFul) << 24) | \
(((b)[1] & 0xFFul) << 16) | \
(((b)[2] & 0xFFul) << 8) | \
(((b)[3] & 0xFFul) << 0))
#define PUTBE32(b, n)\
do{ \
(b)[0] = (n) >> 24; \
(b)[1] = (n) >> 16; \
(b)[2] = (n) >> 8; \
(b)[3] = (n) >> 0; \
} while(0)
Little endian versions proceed similarly:
#define GETLE32(b) \
((((b)[0] & 0xFFul) << 0) | \
(((b)[1] & 0xFFul) << 8) | \
(((b)[2] & 0xFFul) << 16) | \
(((b)[3] & 0xFFul) << 24))
#define PUTLE32(b, n)\
do{ \
(b)[0] = (n) >> 0; \
(b)[1] = (n) >> 8; \
(b)[2] = (n) >> 16; \
(b)[3] = (n) >> 24; \
} while(0)
The 16-bit and 64-bit versions should be obvious.
For porting I'd just use APE, or copy the bits and pieces you need.
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