[Chicken-users] Re: endian-port
On Mon, Feb 22, 2010 at 7:34 PM, Shawn Rutledge wrote: > Functions like endian_lowio_read_int8 return by value, but > endian_lowio_read_ieee_float32 set a value into a passed pointer, so > wonder why that is... anyway seems to be where the problem is. Maybe > it's done that way because of NaN? But usually NaN is a valid value, > and can be tested for with isnan(). And indeed it seems to work OK if I make those functions return double, just as the integer ones return ints/longs. I can still store a +nan.0 into a file, and read it back successfully. I regenerated the swig interface too. ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] endian-port
On Mon, Feb 22, 2010 at 8:52 PM, Ivan Raikov wrote: > Actually, the endian-blob egg in Chicken 4 is meant to take over the > functionality of endian-port. I saw that, but wrapping a port is pretty useful actually, since endian conversions are usually relevant for I/O. It's mostly a matter of keeping some existing code that I wrote a couple years ago working, but I didn't use floats back then, and have since found a need for them... > Your port of endian-port would probably > have to rely on the wrappers generated by swig, which are not especially > readable or maintainable. Unfortunately, I don't have Chicken 3 > installed anymore, so I cannot help with this particular problem, but > take a look at endian-blob and let me know if it would be suitable for > your needs. ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
Re: [Chicken-users] endian-port
Hello, Actually, the endian-blob egg in Chicken 4 is meant to take over the functionality of endian-port. Your port of endian-port would probably have to rely on the wrappers generated by swig, which are not especially readable or maintainable. Unfortunately, I don't have Chicken 3 installed anymore, so I cannot help with this particular problem, but take a look at endian-blob and let me know if it would be suitable for your needs. -Ivan Shawn Rutledge writes: > I'm having trouble reading back a float from a file that I just wrote: > > (use endian-port) > > (let ([outp (port->endian-port (open-output-file "eptest"))]) > (endian-port-write-ieee-float32 outp 5.25) > (close-endian-port outp)) > > (let ([inp (port->endian-port (open-input-file "eptest"))]) > (print (endian-port-read-ieee-float32 inp)) > (close-endian-port inp)) > > it returns #f. > > This was with chicken 3, but I managed to compile that egg for chicken > 4 as well, and it acts the same: > > /usr/bin/csc -feature compiling-extension -setup-mode -O2 -d0 -s -o > endian-port.so endian-port.scm endian_lowio_wrap.c endian_lowio_lib.c > floatformat.c endian_lowio.scm -lchicken -ldl -lm > > #;1> (load "endian-port.so") > ; loading endian-port.so ... > ; loading /usr/lib64/chicken/4/iset.so ... > > so apparently porting that egg is going to be fairly trivial. Maybe > I'll give it a shot if someone will create the directory under > release/4? > > > Functions like endian_lowio_read_int8 return by value, but > endian_lowio_read_ieee_float32 set a value into a passed pointer, so > wonder why that is... anyway seems to be where the problem is. Maybe > it's done that way because of NaN? But usually NaN is a valid value, > and can be tested for with isnan(). ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
[Chicken-users] endian-port
I'm having trouble reading back a float from a file that I just wrote: (use endian-port) (let ([outp (port->endian-port (open-output-file "eptest"))]) (endian-port-write-ieee-float32 outp 5.25) (close-endian-port outp)) (let ([inp (port->endian-port (open-input-file "eptest"))]) (print (endian-port-read-ieee-float32 inp)) (close-endian-port inp)) it returns #f. This was with chicken 3, but I managed to compile that egg for chicken 4 as well, and it acts the same: /usr/bin/csc -feature compiling-extension -setup-mode -O2 -d0 -s -o endian-port.so endian-port.scm endian_lowio_wrap.c endian_lowio_lib.c floatformat.c endian_lowio.scm -lchicken -ldl -lm #;1> (load "endian-port.so") ; loading endian-port.so ... ; loading /usr/lib64/chicken/4/iset.so ... so apparently porting that egg is going to be fairly trivial. Maybe I'll give it a shot if someone will create the directory under release/4? Functions like endian_lowio_read_int8 return by value, but endian_lowio_read_ieee_float32 set a value into a passed pointer, so wonder why that is... anyway seems to be where the problem is. Maybe it's done that way because of NaN? But usually NaN is a valid value, and can be tested for with isnan(). ___ Chicken-users mailing list Chicken-users@nongnu.org http://lists.nongnu.org/mailman/listinfo/chicken-users
