Thomas Schatzl wrote:
Hi,
Or maybe this is a moot question if FPC is only so far running on
platforms that have the same endian as x86 CPU:s? I have no
information on this though...
I can see at least these targets:
- Windows and Linux on x86 CPU:s
- Embedded Linux on ARM CPU:s
Sparc, PowerPC are big endian, there is an ARM big endian target too.
Use BEtoN, NtoBE if the source is known to be big endian.
(http://www.freepascal.org/docs-html/rtl/system/beton.html)
(http://www.freepascal.org/docs-html/rtl/system/ntobe.html)
All good clean fun. See ENDIAN_LITTLE and ENDIAN_BIG in the FPC
Programmers' Manual, and also watch out for alignment issues.
I'd point out that if the embedded system is based on a Motorola chip
and that if this defines that the format transferred across the link is
big-endian, that this is basically the same as internet "network order"
and a convenient hack is to use the endian-conversion functions
associated with socket programming, i.e. HtoNL() etc.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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